WO2018126937A1 - Dispersion-type corundum-spinel air-permeable brick and preparation method therefor - Google Patents

Dispersion-type corundum-spinel air-permeable brick and preparation method therefor Download PDF

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Publication number
WO2018126937A1
WO2018126937A1 PCT/CN2017/118438 CN2017118438W WO2018126937A1 WO 2018126937 A1 WO2018126937 A1 WO 2018126937A1 CN 2017118438 W CN2017118438 W CN 2017118438W WO 2018126937 A1 WO2018126937 A1 WO 2018126937A1
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Prior art keywords
corundum
permeable brick
spinel
fine powder
polyurethane sponge
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PCT/CN2017/118438
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French (fr)
Chinese (zh)
Inventor
李亚伟
梁雄
贺铸
徐义彪
桑绍柏
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武汉科技大学
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Publication of WO2018126937A1 publication Critical patent/WO2018126937A1/en

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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
    • C04B38/0615—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances the burned-out substance being a monolitic element having approximately the same dimensions as the final article, e.g. a porous polyurethane sheet or a prepreg obtained by bonding together resin particles
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/6303—Inorganic additives
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance

Definitions

  • the invention belongs to the technical field of permeable bricks. More particularly, it relates to a diffused corundum-spinel permeable brick and a preparation method thereof.
  • ventilated brick plays a vital role in homogenizing molten steel temperature and removing inclusions, and is the key to improving the quality of high quality steel.
  • the size and distribution range of the bubble group generated by the inert gas passing through the permeable brick directly affect the stirring and impurity removal effect of the molten steel.
  • the diffused corundum-spinel permeable brick is a gas supply element for blowing gas at the bottom of the ladle due to the large surface area of the generated bubble group, the dispersion, the impurity removal effect and the high gas utilization rate.
  • the diffused corundum-spinel permeable brick usually adopts the non-close packing of the particles to realize the diffused through hole, which causes the bonding property between the particles inside the material to be poor, which seriously reduces the overall strength and heat resistance of the permeable brick. Earthquake performance.
  • the invention aims to overcome the defects of the prior art, and aims to provide a preparation method of a dispersive corundum-spinel permeable brick with simple process and low cost, and the integrity of the dispersed corundum-spinel permeable brick prepared by the method. Good, high strength, excellent thermal shock resistance and high ventilation.
  • Step 1 The raw material composition and content of the dispersed corundum-spinel permeable brick are: 60-70 wt% of dense sintered corundum granules or fused white corundum granules, and compact sintered corundum fine powder or fused white corundum fine powder is 25 ⁇ 35 wt%, the magnesium oxide fine powder or the chromium oxide fine powder is 2 to 7 wt%.
  • Step 2 mixing the raw materials according to the raw material components and their contents to obtain a mixture; adding 2-6 wt% of the binder, 0.05-1 wt% of the polycarboxylate and 4-6 wt% to the mixture. Water, stir for 15 to 30 minutes to prepare a castable.
  • Step 3 Fixing a polyurethane sponge at the bottom of the ventilating brick mold, the central axis of the urethane sponge is coincident with the central axis of the permeable brick mold; adding the casting material, vibrating forming, curing, demoulding, and obtaining a permeable brick body .
  • Step 4 placing the permeable brick body into a high-temperature furnace, raising the temperature to 600-800 ° C at a rate of 0.5 to 3 ° C / min, holding for 1 to 3 hours; and heating to 1500 ° at a rate of 2 to 5 ° C / min 1700 ° C, heat preservation 3 ⁇ 5h; with the furnace cooled to room temperature, that is, the dispersion type corundum - spinel permeable brick.
  • the polyurethane sponge has a truncated cone shape, the height of the polyurethane sponge is 1.1 to 1.2 times the height of the gas permeable brick, and any cross-sectional diameter of the polyurethane sponge is 0.7 to 0.9 times the diameter of the corresponding cross-sectional diameter of the gas-permeable brick;
  • the polyurethane sponge has an average pore diameter of 5 to 30 PPI.
  • the dense sintered corundum particles or the fused white corundum particles have an Al 2 O 3 content of ⁇ 97 wt%; the dense sintered corundum particles or the fused white corundum particles have a particle size of 2 to 5 mm.
  • the dense sintered corundum fine powder or the fused white corundum fine powder has an Al 2 O 3 content of ⁇ 97 wt%; and the dense sintered corundum fine powder or the fused white corundum fine powder has a particle size of 0.1 to 1 mm.
  • the particle size of the magnesium oxide fine powder or the chromium oxide fine powder is ⁇ 0.088 mm.
  • the binder is a sol or a calcium aluminate cement.
  • the present invention has the following positive effects as compared with the prior art:
  • the invention fixes the polyurethane sponge at the center position of the ventilating brick mold, and then injects the evenly cast casting material, after vibration molding, curing and demoulding, and then heats the mixture at 600-800 ° C for 1 to 3 h and 1500 to 1700 ° C for 3 ⁇ . After 5 hours of firing, a diffused corundum-spinel permeable brick is obtained, which is simple in process and low in cost. Since the invention is based on the integral casting-burning template technology, the multi-layer composite structure and the non-closely packed pores of the particles are not involved, so the prepared dispersed corundum-spinel permeable brick has good integrity, high strength and heat resistance. Excellent shock and ventilation.
  • the polyurethane sponge is used as a pore-forming template, casted integrally with the castable, and then fired at a high temperature.
  • two temperature sections are used: one is the low temperature section, and the polyurethane is decomposed, volatilized and discharged at 500 to 700 ° C, leaving the structure of the polyurethane itself in the castable.
  • the loss of heat during heating imparts good air permeability to the dispersed corundum-spinel permeable brick.
  • the uniform distribution of the polyurethane sponge network structure enables the dispersed corundum-spinel permeable brick to form a well-distributed through hole, and the formed bubble group can fully stir the molten steel.
  • the second is the high temperature section. When the high temperature is fired, the cast-type dispersive corundum-spinel permeable brick will be sintered, giving the material sufficient strength and integrity. The dispersed corundum-spinel permeable brick is burnt at high temperature.
  • the volume has a certain degree of shrinkage, which can reduce the pore size of the diffused corundum-spinel permeable brick through hole, and thus has a positive effect against penetration and erosion; more importantly, the diffused corundum-spinel permeable brick
  • the diffused corundum-spinel permeable brick There is a through hole with a small aperture inside, which can passivate and terminate the crack generated during the thermal cycle, and significantly improve the thermal shock resistance of the dispersed corundum-spinel permeable brick.
  • the dispersion type corundum-spinel permeable brick prepared by the invention can be significantly reduced in cost and simplified in process by integral casting molding, and the machine-formed diffusion type permeable brick.
  • the diffused corundum-spinel permeable brick prepared by the invention has the following conditions: the normal temperature compressive strength is 160-190 MPa; the 1100 °C water cooling cycle is 5-7 times; the diffused corundum-spinel permeable brick aeration It is 13 to 20 m 3 /h ⁇ 0.3 MPa.
  • the invention has the characteristics of simple process and low cost, and the prepared diffused corundum-spinel permeable brick has uniform distribution of through holes, good integrity, high strength and excellent thermal shock resistance.
  • the dense sintered corundum particles or the fused white corundum particles have an Al 2 O 3 content of ⁇ 97 wt%.
  • the dense sintered corundum fine powder or the fused white corundum fine powder has an Al 2 O 3 content of ⁇ 97 wt%; and the dense sintered corundum fine powder or the fused white corundum fine powder has a particle size of 0.1 to 1 mm.
  • the particle size of the magnesium oxide fine powder or the chromium oxide fine powder is ⁇ 0.088 mm.
  • a dispersive corundum-spinel permeable brick and a preparation method thereof are:
  • Step 1 The raw material composition and content of the dispersed corundum-spinel permeable brick are: 60-65 wt% of the dense sintered corundum particles, 30-35 wt% of the dense sintered corundum fine powder, and 5-7 wt% of the magnesium oxide fine powder.
  • Step 2 mixing the raw materials according to the raw material components and their contents to obtain a mixture; adding 2-6 wt% of the binder, 0.05-1 wt% of the polycarboxylate and 4-6 wt% to the mixture. Water, stir for 15 to 30 minutes to prepare a castable.
  • Step 3 Fixing a polyurethane sponge at the bottom of the ventilating brick mold, the central axis of the urethane sponge is coincident with the central axis of the permeable brick mold; adding the casting material, vibrating forming, curing, demoulding, and obtaining a permeable brick body .
  • Step 4 placing the permeable brick body into a high-temperature furnace, raising the temperature to 600-700 ° C at a rate of 0.5 to 3 ° C / min, holding for 1 to 3 hours; and then heating to 1500 ° at a rate of 2 to 5 ° C / min 1600 ° C, heat preservation 3 ⁇ 5h; with the furnace cooled to room temperature, that is, the dispersion type corundum - spinel permeable brick.
  • the polyurethane sponge has a truncated cone shape, the height of the polyurethane sponge is 1.1 to 1.2 times the height of the gas permeable brick, and any cross-sectional diameter of the polyurethane sponge is 0.7 to 0.9 times the diameter of the corresponding cross-sectional diameter of the gas-permeable brick;
  • the polyurethane sponge has an average pore diameter of 5 to 15 PPI.
  • the dense sintered corundum particles have a particle size of 3 to 5 mm; the binder is a sol.
  • the diffused corundum-spinel permeable brick prepared in the first embodiment has been tested: normal temperature compressive strength is 180-190 MPa; 1100 ° C water cooling cycle is 5-6 times; the diffused corundum-spinel permeable brick The ventilation is 13 to 15 m 3 /h ⁇ 0.3 MPa.
  • a dispersive corundum-spinel permeable brick and a preparation method thereof are:
  • Step 1 The raw material composition and content of the dispersed corundum-spinel permeable brick are: 60-65 wt% of the dense sintered corundum particles, 30-35 wt% of the fused white corundum fine powder, and 5-7 wt% of the magnesia fine powder. .
  • Step 2 mixing the raw materials according to the raw material components and their contents to obtain a mixture; adding 2-6 wt% of the binder, 0.05-1 wt% of the polycarboxylate and 4-6 wt% to the mixture. Water, stir for 15 to 30 minutes to prepare a castable.
  • Step 3 Fixing a polyurethane sponge at the bottom of the ventilating brick mold, the central axis of the urethane sponge is coincident with the central axis of the permeable brick mold; adding the casting material, vibrating forming, curing, demoulding, and obtaining a permeable brick body .
  • Step 4 placing the permeable brick body into a high-temperature furnace, raising the temperature to 600-700 ° C at a rate of 0.5 to 3 ° C / min, holding for 1 to 3 hours; and then heating to 1500 ° at a rate of 2 to 5 ° C / min 1600 ° C, heat preservation 3 ⁇ 5h; with the furnace cooled to room temperature, that is, the dispersion type corundum - spinel permeable brick.
  • the polyurethane sponge has a truncated cone shape, the height of the polyurethane sponge is 1.1 to 1.2 times the height of the gas permeable brick, and any cross-sectional diameter of the polyurethane sponge is 0.7 to 0.9 times the diameter of the corresponding cross-sectional diameter of the gas-permeable brick;
  • the polyurethane sponge has an average pore diameter of 10 to 20 PPI.
  • the dense sintered corundum particles have a particle size of 2 to 4 mm; and the binder is calcium aluminate cement.
  • the diffused corundum-spinel permeable brick prepared in the second embodiment has been tested: normal temperature compressive strength is 163-170 MPa; 1100 ° C water cooling cycle is 5-6 times; the diffused corundum-spinel permeable brick The ventilation amount is 14 to 18 m 3 /h ⁇ 0.3 MPa.
  • a dispersive corundum-spinel permeable brick and a preparation method thereof are:
  • Step 1 The raw material composition and content of the dispersed corundum-spinel permeable brick are: 60-65 wt% of fused white corundum particles, 30-35 wt% of dense sintered corundum fine powder, and 5-7 wt% of chromium oxide fine powder. .
  • Step 2 mixing the raw materials according to the raw material components and their contents to obtain a mixture; adding 2-6 wt% of the binder, 0.05-1 wt% of the polycarboxylate and 4-6 wt% to the mixture. Water, stir for 15 to 30 minutes to prepare a castable.
  • Step 3 Fixing a polyurethane sponge at the bottom of the ventilating brick mold, the central axis of the urethane sponge is coincident with the central axis of the permeable brick mold; adding the casting material, vibrating forming, curing, demoulding, and obtaining a permeable brick body .
  • Step 4 placing the permeable brick body into a high-temperature furnace, raising the temperature to 600-700 ° C at a rate of 0.5 to 3 ° C / min, holding for 1 to 3 hours; and then heating to 1500 ° at a rate of 2 to 5 ° C / min 1600 ° C, heat preservation 3 ⁇ 5h; with the furnace cooled to room temperature, that is, the dispersion type corundum - spinel permeable brick.
  • the polyurethane sponge has a truncated cone shape, the height of the polyurethane sponge is 1.1 to 1.2 times the height of the gas permeable brick, and any cross-sectional diameter of the polyurethane sponge is 0.7 to 0.9 times the diameter of the corresponding cross-sectional diameter of the gas-permeable brick;
  • the polyurethane sponge has an average pore diameter of 15 to 25 PPI.
  • the fused white corundum particles have a particle size of 2 to 3 mm; the binder is a sol.
  • the diffused corundum-spinel permeable brick prepared in the third embodiment has been tested: the normal temperature compressive strength is 168-175 MPa; the 1100 °C water cooling cycle is 6-7 times; the diffused corundum-spinel permeable brick The ventilation amount is 15 to 20 m 3 /h ⁇ 0.3 MPa.
  • a dispersive corundum-spinel permeable brick and a preparation method thereof are:
  • Step 1 The raw material composition and content of the dispersed corundum-spinel permeable brick are: 60-65 wt% of fused white corundum granules, 30-35 wt% of fused white corundum fine powder, and 5-7 wt of chrome oxide fine powder. %.
  • Step 2 mixing the raw materials according to the raw material components and their contents to obtain a mixture; adding 2-6 wt% of the binder, 0.05-1 wt% of the polycarboxylate and 4-6 wt% to the mixture. Water, stir for 15 to 30 minutes to prepare a castable.
  • Step 3 Fixing a polyurethane sponge at the bottom of the ventilating brick mold, the central axis of the urethane sponge is coincident with the central axis of the permeable brick mold; adding the casting material, vibrating forming, curing, demoulding, and obtaining a permeable brick body .
  • Step 4 placing the permeable brick body into a high-temperature furnace, raising the temperature to 600-700 ° C at a rate of 0.5 to 3 ° C / min, holding for 1 to 3 hours; and then heating to 1500 ° at a rate of 2 to 5 ° C / min 1600 ° C, heat preservation 3 ⁇ 5h; with the furnace cooled to room temperature, that is, the dispersion type corundum - spinel permeable brick.
  • the polyurethane sponge has a truncated cone shape, the height of the polyurethane sponge is 1.1 to 1.2 times the height of the gas permeable brick, and any cross-sectional diameter of the polyurethane sponge is 0.7 to 0.9 times the diameter of the corresponding cross-sectional diameter of the gas-permeable brick;
  • the polyurethane sponge has an average pore diameter of 20 to 30 PPI.
  • the fused white corundum particles have a particle size of 2 to 3 mm; and the binder is calcium aluminate cement.
  • the diffused corundum-spinel permeable brick prepared in the fourth embodiment has been tested: normal temperature compressive strength is 160-173 MPa; 1100 ° C water cooling cycle is 5-6 times; the diffused corundum-spinel permeable brick The ventilation amount is 16 to 20 m 3 /h ⁇ 0.3 MPa.
  • a dispersive corundum-spinel permeable brick and a preparation method thereof are:
  • Step 1 The raw material composition and content of the dispersed corundum-spinel permeable brick are: 65 to 70 wt% of the dense sintered corundum particles, 25 to 30 wt% of the dense sintered corundum fine powder, and 2 to 5 wt% of the magnesium oxide fine powder.
  • Step 2 mixing the raw materials according to the raw material components and their contents to obtain a mixture; adding 2-6 wt% of the binder, 0.05-1 wt% of the polycarboxylate and 4-6 wt% to the mixture. Water, stir for 15 to 30 minutes to prepare a castable.
  • Step 3 Fixing a polyurethane sponge at the bottom of the ventilating brick mold, the central axis of the urethane sponge is coincident with the central axis of the permeable brick mold; adding the casting material, vibrating forming, curing, demoulding, and obtaining a permeable brick body .
  • Step 4 placing the permeable brick body into a high-temperature furnace, raising the temperature to 700-800 ° C at a rate of 0.5 to 3 ° C / min, maintaining the temperature for 1 to 3 h; and then raising the temperature to 1600 ° at a rate of 2 to 5 ° C / min. 1700 ° C, heat preservation 3 ⁇ 5h; with the furnace cooled to room temperature, that is, the dispersion type corundum - spinel permeable brick.
  • the polyurethane sponge has a truncated cone shape, the height of the polyurethane sponge is 1.1 to 1.2 times the height of the gas permeable brick, and any cross-sectional diameter of the polyurethane sponge is 0.7 to 0.9 times the diameter of the corresponding cross-sectional diameter of the gas-permeable brick;
  • the polyurethane sponge has an average pore diameter of 5 to 10 PPI.
  • the dense sintered corundum particles have a particle size of 3 to 5 mm; the binder is a sol.
  • the diffused corundum-spinel permeable brick prepared in the fifth embodiment has been tested: the normal temperature compressive strength is 175-188 MPa; the 1100 °C water cooling cycle is 6-7 times; the diffused corundum-spinel permeable brick The ventilation amount is 13 to 16 m 3 /h ⁇ 0.3 MPa.
  • a dispersive corundum-spinel permeable brick and a preparation method thereof are:
  • Step 1 The raw material composition and content of the dispersed corundum-spinel permeable brick are: 65 to 70 wt% of the dense sintered corundum particles, 25 to 30 wt% of the fused white corundum fine powder, and 2 to 5 wt% of the magnesium oxide fine powder. .
  • Step 2 mixing the raw materials according to the raw material components and their contents to obtain a mixture; adding 2-6 wt% of the binder, 0.05-1 wt% of the polycarboxylate and 4-6 wt% to the mixture. Water, stir for 15 to 30 minutes to prepare a castable.
  • Step 3 Fixing a polyurethane sponge at the bottom of the ventilating brick mold, the central axis of the urethane sponge is coincident with the central axis of the permeable brick mold; adding the casting material, vibrating forming, curing, demoulding, and obtaining a permeable brick body .
  • Step 4 placing the permeable brick body into a high-temperature furnace, raising the temperature to 700-800 ° C at a rate of 0.5 to 3 ° C / min, maintaining the temperature for 1 to 3 h; and then raising the temperature to 1600 ° at a rate of 2 to 5 ° C / min. 1700 ° C, heat preservation 3 ⁇ 5h; with the furnace cooled to room temperature, that is, the dispersion type corundum - spinel permeable brick.
  • the polyurethane sponge has a truncated cone shape, the height of the polyurethane sponge is 1.1 to 1.2 times the height of the gas permeable brick, and any cross-sectional diameter of the polyurethane sponge is 0.7 to 0.9 times the diameter of the corresponding cross-sectional diameter of the gas-permeable brick;
  • the polyurethane sponge has an average pore diameter of 8 to 15 PPI.
  • the dense sintered corundum particles have a particle size of 2 to 4 mm; and the binder is calcium aluminate cement.
  • the dispersion type corundum-spinel permeable brick prepared in the sixth embodiment has been tested: the normal temperature compressive strength is 170-186 MPa; the 1100 ° C water cooling cycle is 5-6 times; the diffused corundum-spinel permeable brick The ventilation amount is 14 to 18 m 3 /h ⁇ 0.3 MPa.
  • a dispersive corundum-spinel permeable brick and a preparation method thereof are:
  • Step 1 The raw material composition and content of the dispersed corundum-spinel permeable brick are: 65-70 wt% of fused white corundum particles, 25-30 wt% of dense sintered corundum powder, and 2-5 wt% of chromium oxide fine powder. .
  • Step 2 mixing the raw materials according to the raw material components and their contents to obtain a mixture; adding 2-6 wt% of the binder, 0.05-1 wt% of the polycarboxylate and 4-6 wt% to the mixture. Water, stir for 15 to 30 minutes to prepare a castable.
  • Step 3 Fixing a polyurethane sponge at the bottom of the ventilating brick mold, the central axis of the urethane sponge is coincident with the central axis of the permeable brick mold; adding the casting material, vibrating forming, curing, demoulding, and obtaining a permeable brick body .
  • Step 4 placing the permeable brick body into a high-temperature furnace, raising the temperature to 700-800 ° C at a rate of 0.5 to 3 ° C / min, maintaining the temperature for 1 to 3 h; and then raising the temperature to 1600 ° at a rate of 2 to 5 ° C / min. 1700 ° C, heat preservation 3 ⁇ 5h; with the furnace cooled to room temperature, that is, the dispersion type corundum - spinel permeable brick.
  • the polyurethane sponge has a truncated cone shape, the height of the polyurethane sponge is 1.1 to 1.2 times the height of the gas permeable brick, and any cross-sectional diameter of the polyurethane sponge is 0.7 to 0.9 times the diameter of the corresponding cross-sectional diameter of the gas-permeable brick;
  • the polyurethane sponge has an average pore diameter of 15 to 25 PPI.
  • the fused white corundum particles have a particle size of 2 to 3 mm; the binder is a sol.
  • the dispersion type corundum-spinel permeable brick prepared in the sixth embodiment has been tested: the normal temperature compressive strength is 170-180 MPa; the 1100 °C water cooling cycle is 5-6 times; the diffused corundum-spinel permeable brick The ventilation amount is 16 to 20 m 3 /h ⁇ 0.3 MPa.
  • a dispersive corundum-spinel permeable brick and a preparation method thereof are:
  • Step 1 The raw material composition and content of the dispersed corundum-spinel permeable brick are: 65-70 wt% of fused white corundum particles, 25-30 wt% of fused white corundum fine powder, and 2-5 wt of chromium oxide fine powder. %.
  • Step 2 mixing the raw materials according to the raw material components and their contents to obtain a mixture; adding 2-6 wt% of the binder, 0.05-1 wt% of the polycarboxylate and 4-6 wt% to the mixture. Water, stir for 15 to 30 minutes to prepare a castable.
  • Step 3 Fixing a polyurethane sponge at the bottom of the ventilating brick mold, the central axis of the urethane sponge is coincident with the central axis of the permeable brick mold; adding the casting material, vibrating forming, curing, demoulding, and obtaining a permeable brick body .
  • Step 4 placing the permeable brick body into a high-temperature furnace, raising the temperature to 700-800 ° C at a rate of 0.5 to 3 ° C / min, maintaining the temperature for 1 to 3 h; and then raising the temperature to 1600 ° at a rate of 2 to 5 ° C / min. 1700 ° C, heat preservation 3 ⁇ 5h; with the furnace cooled to room temperature, that is, the dispersion type corundum - spinel permeable brick.
  • the polyurethane sponge has a truncated cone shape, the height of the polyurethane sponge is 1.1 to 1.2 times the height of the gas permeable brick, and any cross-sectional diameter of the polyurethane sponge is 0.7 to 0.9 times the diameter of the corresponding cross-sectional diameter of the gas-permeable brick;
  • the polyurethane sponge has an average pore diameter of 20 to 30 PPI.
  • the fused white corundum particles have a particle size of 2 to 3 mm; and the binder is calcium aluminate cement.
  • the diffused corundum-spinel permeable brick prepared in the sixth embodiment has been tested: the normal temperature compressive strength is 165-178 MPa; the 1100 °C water cooling cycle is 5-6 times; the diffused corundum-spinel permeable brick The ventilation amount is 16 to 20 m 3 /h ⁇ 0.3 MPa.
  • the polyurethane sponge is fixed at the center of the ventilating brick mold, and then the uniformly poured castable material is injected, vibrated, cured and demolded, and then insulated at 600-800 ° C for 1 to 3 h and 1500 to 1700 ° C. After 3 to 5 hours of firing, a diffused corundum-spinel permeable brick is obtained, which is simple in process and low in cost. Since the specific embodiment is based on the integral casting-burning template technology, the multi-layer composite structure and the non-close packing of the particles are not involved, so the prepared corundum-spinel permeable brick has good integrity and high strength. Excellent thermal shock resistance and high ventilation.
  • the polyurethane sponge is used as a pore-forming template, casted integrally with the castable, and then fired at a high temperature.
  • two temperature sections are used: one is the low temperature section, and the polyurethane is decomposed, volatilized and discharged at 500 to 700 ° C, leaving the structure of the polyurethane itself in the castable.
  • the loss of heat during heating imparts good air permeability to the dispersed corundum-spinel permeable brick.
  • the uniform distribution of the polyurethane sponge network structure enables the dispersed corundum-spinel permeable brick to form a well-distributed through hole, and the formed bubble group can fully stir the molten steel.
  • the second is the high temperature section. When the high temperature is fired, the cast-type dispersive corundum-spinel permeable brick will be sintered, giving the material sufficient strength and integrity. The dispersed corundum-spinel permeable brick is burnt at high temperature.
  • the diffused corundum-spinel permeable brick When it is formed, its volume has a certain degree of shrinkage, which can reduce the pore size of the diffused corundum-spinel permeable brick through hole, and thus has a positive effect against penetration and erosion; more importantly, the diffused corundum-spinel permeable brick There is a through hole with a small aperture inside, which can passivate and terminate the crack generated during the thermal cycle, and significantly improve the thermal shock resistance of the dispersed corundum-spinel permeable brick.
  • the diffused corundum-spinel permeable brick prepared by the specific embodiment is formed by integral casting, and the machined and formed diffused permeable brick can significantly reduce the cost and simplify the process.
  • the diffused corundum-spinel permeable brick prepared by the specific embodiment is tested: the normal temperature compressive strength is 160-190 MPa; the 1100 °C water cooling cycle is 5-7 times; the diffused corundum-spinel permeable brick The ventilation amount is 13 to 20 m 3 /h ⁇ 0.3 MPa.
  • the specific embodiment has the characteristics of simple process and low cost, and the prepared diffused corundum-spinel permeable brick has uniform through hole distribution, good integrity, high strength and excellent thermal shock resistance.

Abstract

Provided are a dispersion-type corundum-spinel air-permeable brick and a preparation method therefor. The raw material components of the air-permeable brick and the contents thereof are: 60-70 wt% of densely sintered corundum particles or electrically fused white corundum particles, 25-35 wt% of densely sintered corundum fine powder or electrically fused white corundum fine powder and 2-7 wt% of magnesium oxide micropowder or chromium oxide micropowder. The raw materials are mixed, and a binding agent, a polycarboxylate and water are added and stirred to obtain a castable material; a polyurethane sponge is fixed to the bottom of an air-permeable brick mould, the castable material is added, and after vibration moulding, curing and demoulding, an air-permeable brick blank is obtained; the air-permeable brick blank is placed in a high-temperature furnace, maintained at 600-800°C for 1-3 h and at 1500-1700°C for 3-5 h; and the air-permeable brick blank is cooled to room temperature with the furnace, so that the dispersion-type corundum-spinel air-permeable brick is obtained.

Description

一种弥散型刚玉-尖晶石透气砖及其制备方法Dispersed corundum-spinel permeable brick and preparation method thereof 技术领域Technical field
本发明属于透气砖技术领域。尤其涉及一种弥散型刚玉-尖晶石透气砖及其制备方法。The invention belongs to the technical field of permeable bricks. More particularly, it relates to a diffused corundum-spinel permeable brick and a preparation method thereof.
背景技术Background technique
随着洁净钢冶炼技术的进步，特别是品种钢冶炼量的增多，使得炉外精炼在冶炼过程中所占比重越来越大。透气砖作为炉外精炼工艺中重要的供气元件，对均化钢水温度、去除夹杂起到至关重要的作用，是提高高品质钢质量的关键。其中，惰性气体经透气砖后生成的气泡群的大小和分布范围直接影响着钢液的搅拌及除杂效果。弥散型刚玉-尖晶石透气砖因产生的气泡群逸出表面积大且分散、除杂效果好以及气体利用率高而作为钢包底吹气体的供气元件。然而，弥散型刚玉-尖晶石透气砖在制备过程中通常采用颗粒的非紧密堆积来实现弥散型通孔，致使材料内部颗粒间的结合性能差，严重降低了透气砖的整体强度和抗热震性能。With the advancement of clean steel smelting technology, especially the increase in the amount of steel smelting, the proportion of refining outside the furnace in the smelting process is increasing. As an important gas supply component in the refining process, ventilated brick plays a vital role in homogenizing molten steel temperature and removing inclusions, and is the key to improving the quality of high quality steel. Among them, the size and distribution range of the bubble group generated by the inert gas passing through the permeable brick directly affect the stirring and impurity removal effect of the molten steel. The diffused corundum-spinel permeable brick is a gas supply element for blowing gas at the bottom of the ladle due to the large surface area of the generated bubble group, the dispersion, the impurity removal effect and the high gas utilization rate. However, in the preparation process, the diffused corundum-spinel permeable brick usually adopts the non-close packing of the particles to realize the diffused through hole, which causes the bonding property between the particles inside the material to be poor, which seriously reduces the overall strength and heat resistance of the permeable brick. Earthquake performance.
为解决弥散型刚玉-尖晶石透气砖的强度和抗热震性能差等问题，“一种复合透气砖”(CN201620177U)的专利技术，公开了一种上部为机压弥散型透气砖、下部为非弥散型的复合透气砖。此方法制得的透气砖虽然能形成大量的、直径较小的气泡群，但是两种结构的物理拼接使得透气砖的整体性较差，容易导致钢液向透气砖内部渗透，影响透气砖的通气量和使用寿命。In order to solve the problems of the strength and thermal shock resistance of the diffused corundum-spinel permeable brick, the patented technology of "Compound Breathable Brick" (CN201620177U) discloses an upper part of the machine-pressure dispersion type permeable brick and the lower part. It is a non-dispersive composite permeable brick. Although the ventilated brick obtained by the method can form a large number of small bubble groups, the physical splicing of the two structures makes the permeable brick have poor integrity, which easily causes the molten steel to penetrate into the permeable brick and affects the permeable brick. Ventilation and service life.
发明内容Summary of the invention
本发明旨在克服现有技术缺陷，目的是提供一种工艺简单和成本低的弥散型刚玉-尖晶石透气砖的制备方法，用该方法制备的弥散型刚玉-尖晶石透气砖整体性好、强度高、抗热震性能优良和通气量大。The invention aims to overcome the defects of the prior art, and aims to provide a preparation method of a dispersive corundum-spinel permeable brick with simple process and low cost, and the integrity of the dispersed corundum-spinel permeable brick prepared by the method. Good, high strength, excellent thermal shock resistance and high ventilation.
为实现上述目的，本发明采用的技术方案的步骤是：In order to achieve the above object, the steps of the technical solution adopted by the present invention are:
步骤一、弥散型刚玉-尖晶石透气砖的原料成分及其含量是：致密烧结刚玉颗粒或电熔白刚玉颗粒为60～70wt％，致密烧结刚玉细粉或电熔白刚玉细粉为25～35wt％，氧化镁微粉或氧化铬微粉为2～7wt％。Step 1. The raw material composition and content of the dispersed corundum-spinel permeable brick are: 60-70 wt% of dense sintered corundum granules or fused white corundum granules, and compact sintered corundum fine powder or fused white corundum fine powder is 25 ～35 wt%, the magnesium oxide fine powder or the chromium oxide fine powder is 2 to 7 wt%.
步骤二、按所述原料成分及其含量将原料混合，得混合料；再向所述混合料中加入2～6wt％的结合剂、0.05～1wt％的聚羧酸盐和4～6wt％的水，搅拌15～30min，制得浇注料。Step 2: mixing the raw materials according to the raw material components and their contents to obtain a mixture; adding 2-6 wt% of the binder, 0.05-1 wt% of the polycarboxylate and 4-6 wt% to the mixture. Water, stir for 15 to 30 minutes to prepare a castable.
步骤三、在透气砖模具底部固定有聚氨酯海绵，所述聚氨酯海绵的中轴线与所述透气砖模具的中轴线重合；再加入所述浇注料，振动成型，养护，脱模，得到透气砖坯体。Step 3: Fixing a polyurethane sponge at the bottom of the ventilating brick mold, the central axis of the urethane sponge is coincident with the central axis of the permeable brick mold; adding the casting material, vibrating forming, curing, demoulding, and obtaining a permeable brick body .
步骤四、将所述透气砖坯体置入高温炉内，以0.5～3℃/min的速率升温至600～800℃，保温1～3h；再以2～5℃/min的速率升温至1500～1700℃，保温3～5h；随炉冷却至室温，即得弥散型刚玉-尖晶石透气砖。Step 4: placing the permeable brick body into a high-temperature furnace, raising the temperature to 600-800 ° C at a rate of 0.5 to 3 ° C / min, holding for 1 to 3 hours; and heating to 1500 ° at a rate of 2 to 5 ° C / min 1700 ° C, heat preservation 3 ~ 5h; with the furnace cooled to room temperature, that is, the dispersion type corundum - spinel permeable brick.
所述聚氨酯海绵呈圆锥台状，聚氨酯海绵的高度为透气砖高度的1.1～1.2倍，聚氨酯海绵的任一横截面直径均为透气砖等高处对应横截面直径的0.7～0.9倍；所述聚氨酯海绵的平均孔径为5～30PPI。The polyurethane sponge has a truncated cone shape, the height of the polyurethane sponge is 1.1 to 1.2 times the height of the gas permeable brick, and any cross-sectional diameter of the polyurethane sponge is 0.7 to 0.9 times the diameter of the corresponding cross-sectional diameter of the gas-permeable brick; The polyurethane sponge has an average pore diameter of 5 to 30 PPI.
所述致密烧结刚玉颗粒或电熔白刚玉颗粒的Al 2O 3含量≥97wt％；所述致密烧结刚玉颗粒或电熔白刚玉颗粒的粒度为2～5mm。 The dense sintered corundum particles or the fused white corundum particles have an Al 2 O 3 content of ≥97 wt%; the dense sintered corundum particles or the fused white corundum particles have a particle size of 2 to 5 mm.
所述致密烧结刚玉细粉或电熔白刚玉细粉的Al 2O 3含量≥97wt％；所述致密烧结刚玉细粉或电熔白刚玉细粉的粒度为0.1～1mm。 The dense sintered corundum fine powder or the fused white corundum fine powder has an Al 2 O 3 content of ≥97 wt%; and the dense sintered corundum fine powder or the fused white corundum fine powder has a particle size of 0.1 to 1 mm.
所述氧化镁微粉或氧化铬微粉的粒度≤0.088mm。The particle size of the magnesium oxide fine powder or the chromium oxide fine powder is ≤0.088 mm.
所述结合剂为溶胶或为铝酸钙水泥。The binder is a sol or a calcium aluminate cement.
由于采用上述技术方案，本发明与现有技术相比，具有如下积极效果：Due to the adoption of the above technical solution, the present invention has the following positive effects as compared with the prior art:
本发明将聚氨酯海绵固定在透气砖模具的中心位置处，再注入搅拌均匀的浇注料，经振动成型、养护和脱模，然后经600～800℃保温1～3h和1500～1700℃保温3～5h烧成，制得弥散型刚玉-尖晶石透气砖，工艺简单和成本低。由于本发明基于整体浇注—燃尽物模板技术，不涉及多层复合结构以及颗粒的非紧密堆积成孔，故所制备的弥散型刚玉-尖晶石透气砖整体性好、强度高、抗热震性优良和通气量大。The invention fixes the polyurethane sponge at the center position of the ventilating brick mold, and then injects the evenly cast casting material, after vibration molding, curing and demoulding, and then heats the mixture at 600-800 ° C for 1 to 3 h and 1500 to 1700 ° C for 3 ～. After 5 hours of firing, a diffused corundum-spinel permeable brick is obtained, which is simple in process and low in cost. Since the invention is based on the integral casting-burning template technology, the multi-layer composite structure and the non-closely packed pores of the particles are not involved, so the prepared dispersed corundum-spinel permeable brick has good integrity, high strength and heat resistance. Excellent shock and ventilation.
本发明将聚氨酯海绵作为造孔模板，与浇注料浇注为整体，然后经高温烧成。在弥散型刚玉-尖晶石透气砖的烧制过程采用两个温度段：一是低温段，聚氨酯于500～700℃会发生分解、挥发并排出，在浇注料中遗留下聚氨酯本身的结构。作为模板的聚氨酯海绵的三维网状结构，其加热过程中的烧失赋予弥散型刚玉-尖晶石透气砖具有良好的通气性。聚氨酯海绵网状结构的均匀分布，能使弥散型刚玉-尖晶石透气砖形成分散性好的通 孔，所形成的气泡群能充分对钢液进行搅拌。二是高温段，当高温烧成时，经浇注成型的弥散型刚玉-尖晶石透气砖会发生烧结行为，赋予材料足够的强度和整体性，弥散型刚玉-尖晶石透气砖在高温烧成时，其体积存在一定程度的收缩，能降低弥散型刚玉-尖晶石透气砖通孔的孔径，进而对抗渗透和侵蚀有积极作用；更重要的是，弥散型刚玉-尖晶石透气砖内部存在孔径细小的通孔，能钝化和终止因冷热循环时产生的裂纹，显著提高弥散型刚玉-尖晶石透气砖的抗热震性能。本发明制备的弥散型刚玉-尖晶石透气砖因整体浇注成型，较机压成型的弥散型透气砖能显著地降低成本和简化工艺。In the invention, the polyurethane sponge is used as a pore-forming template, casted integrally with the castable, and then fired at a high temperature. In the firing process of the dispersion type corundum-spinel permeable brick, two temperature sections are used: one is the low temperature section, and the polyurethane is decomposed, volatilized and discharged at 500 to 700 ° C, leaving the structure of the polyurethane itself in the castable. As a template of the three-dimensional network structure of the polyurethane sponge, the loss of heat during heating imparts good air permeability to the dispersed corundum-spinel permeable brick. The uniform distribution of the polyurethane sponge network structure enables the dispersed corundum-spinel permeable brick to form a well-distributed through hole, and the formed bubble group can fully stir the molten steel. The second is the high temperature section. When the high temperature is fired, the cast-type dispersive corundum-spinel permeable brick will be sintered, giving the material sufficient strength and integrity. The dispersed corundum-spinel permeable brick is burnt at high temperature. When it is formed, its volume has a certain degree of shrinkage, which can reduce the pore size of the diffused corundum-spinel permeable brick through hole, and thus has a positive effect against penetration and erosion; more importantly, the diffused corundum-spinel permeable brick There is a through hole with a small aperture inside, which can passivate and terminate the crack generated during the thermal cycle, and significantly improve the thermal shock resistance of the dispersed corundum-spinel permeable brick. The dispersion type corundum-spinel permeable brick prepared by the invention can be significantly reduced in cost and simplified in process by integral casting molding, and the machine-formed diffusion type permeable brick.
本发明制备的弥散型刚玉-尖晶石透气砖经检测：常温耐压强度为160～190MPa；1100℃水冷循环次数为5～7次；所述弥散型刚玉-尖晶石透气砖的通气量为13～20m 3/h·0.3MPa。 The diffused corundum-spinel permeable brick prepared by the invention has the following conditions: the normal temperature compressive strength is 160-190 MPa; the 1100 °C water cooling cycle is 5-7 times; the diffused corundum-spinel permeable brick aeration It is 13 to 20 m 3 /h·0.3 MPa.
因此，本发明具有工艺简单和成本低的特点，所制备的弥散型刚玉-尖晶石透气砖通孔分布均匀、整体性好、强度高和抗热震性优良。Therefore, the invention has the characteristics of simple process and low cost, and the prepared diffused corundum-spinel permeable brick has uniform distribution of through holes, good integrity, high strength and excellent thermal shock resistance.
具体实施方式detailed description
下面结合具体实施方式对本发明作进一步的描述，并非对其保护范围的限制。The present invention is further described in conjunction with the specific embodiments, and is not intended to limit the scope thereof.
为避免重复，现将本具体实施方式所涉及原料统一描述如下：In order to avoid duplication, the raw materials involved in this embodiment are collectively described as follows:
所述致密烧结刚玉颗粒或电熔白刚玉颗粒的Al 2O 3含量≥97wt％。 The dense sintered corundum particles or the fused white corundum particles have an Al 2 O 3 content of ≥97 wt%.
所述致密烧结刚玉细粉或电熔白刚玉细粉的Al 2O 3含量≥97wt％；所述致密烧结刚玉细粉或电熔白刚玉细粉的粒度为0.1～1mm。 The dense sintered corundum fine powder or the fused white corundum fine powder has an Al 2 O 3 content of ≥97 wt%; and the dense sintered corundum fine powder or the fused white corundum fine powder has a particle size of 0.1 to 1 mm.
所述氧化镁微粉或氧化铬微粉的粒度≤0.088mm。The particle size of the magnesium oxide fine powder or the chromium oxide fine powder is ≤0.088 mm.
实施例1Example 1
一种弥散型刚玉-尖晶石透气砖及其制备方法。本实施例所述制备方法的具体步骤是：A dispersive corundum-spinel permeable brick and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:
步骤一、弥散型刚玉-尖晶石透气砖的原料成分及其含量是：致密烧结刚玉颗粒为60～65wt％，致密烧结刚玉细粉为30～35wt％，氧化镁微粉为5～7wt％。Step 1: The raw material composition and content of the dispersed corundum-spinel permeable brick are: 60-65 wt% of the dense sintered corundum particles, 30-35 wt% of the dense sintered corundum fine powder, and 5-7 wt% of the magnesium oxide fine powder.
步骤二、按所述原料成分及其含量将原料混合，得混合料；再向所述混合料中加入2～6wt％的结合剂、0.05～1wt％的聚羧酸盐和4～6wt％的水，搅拌15～30min，制得浇注料。Step 2: mixing the raw materials according to the raw material components and their contents to obtain a mixture; adding 2-6 wt% of the binder, 0.05-1 wt% of the polycarboxylate and 4-6 wt% to the mixture. Water, stir for 15 to 30 minutes to prepare a castable.
步骤三、在透气砖模具底部固定有聚氨酯海绵，所述聚氨酯海绵的中轴线与所述透气砖模具的中轴线重合；再加入所述浇注料，振动成型，养护，脱模，得到透气砖坯体。Step 3: Fixing a polyurethane sponge at the bottom of the ventilating brick mold, the central axis of the urethane sponge is coincident with the central axis of the permeable brick mold; adding the casting material, vibrating forming, curing, demoulding, and obtaining a permeable brick body .
步骤四、将所述透气砖坯体置入高温炉内，以0.5～3℃/min的速率升温至600～700℃，保温1～3h；再以2～5℃/min的速率升温至1500～1600℃，保温3～5h；随炉冷却至室温，即得弥散型刚玉-尖晶石透气砖。Step 4: placing the permeable brick body into a high-temperature furnace, raising the temperature to 600-700 ° C at a rate of 0.5 to 3 ° C / min, holding for 1 to 3 hours; and then heating to 1500 ° at a rate of 2 to 5 ° C / min 1600 ° C, heat preservation 3 ~ 5h; with the furnace cooled to room temperature, that is, the dispersion type corundum - spinel permeable brick.
所述聚氨酯海绵呈圆锥台状，聚氨酯海绵的高度为透气砖高度的1.1～1.2倍，聚氨酯海绵的任一横截面直径均为透气砖等高处对应横截面直径的0.7～0.9倍；所述聚氨酯海绵的平均孔径为5～15PPI。The polyurethane sponge has a truncated cone shape, the height of the polyurethane sponge is 1.1 to 1.2 times the height of the gas permeable brick, and any cross-sectional diameter of the polyurethane sponge is 0.7 to 0.9 times the diameter of the corresponding cross-sectional diameter of the gas-permeable brick; The polyurethane sponge has an average pore diameter of 5 to 15 PPI.
所述致密烧结刚玉颗粒的粒度为3～5mm；所述结合剂为溶胶。The dense sintered corundum particles have a particle size of 3 to 5 mm; the binder is a sol.
本实施例1制备的弥散型刚玉-尖晶石透气砖经检测：常温耐压强度为180～190MPa；1100℃水冷循环次数为5～6次；所述弥散型刚玉-尖晶石透气砖的通气量为13～15m 3/h·0.3MPa。 The diffused corundum-spinel permeable brick prepared in the first embodiment has been tested: normal temperature compressive strength is 180-190 MPa; 1100 ° C water cooling cycle is 5-6 times; the diffused corundum-spinel permeable brick The ventilation is 13 to 15 m 3 /h·0.3 MPa.
实施例2Example 2
一种弥散型刚玉-尖晶石透气砖及其制备方法。本实施例所述制备方法的具体步骤是：A dispersive corundum-spinel permeable brick and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:
步骤一、弥散型刚玉-尖晶石透气砖的原料成分及其含量是：致密烧结刚玉颗粒为60～65wt％，电熔白刚玉细粉为30～35wt％，氧化镁微粉为5～7wt％。Step 1. The raw material composition and content of the dispersed corundum-spinel permeable brick are: 60-65 wt% of the dense sintered corundum particles, 30-35 wt% of the fused white corundum fine powder, and 5-7 wt% of the magnesia fine powder. .
步骤二、按所述原料成分及其含量将原料混合，得混合料；再向所述混合料中加入2～6wt％的结合剂、0.05～1wt％的聚羧酸盐和4～6wt％的水，搅拌15～30min，制得浇注料。Step 2: mixing the raw materials according to the raw material components and their contents to obtain a mixture; adding 2-6 wt% of the binder, 0.05-1 wt% of the polycarboxylate and 4-6 wt% to the mixture. Water, stir for 15 to 30 minutes to prepare a castable.
步骤三、在透气砖模具底部固定有聚氨酯海绵，所述聚氨酯海绵的中轴线与所述透气砖模具的中轴线重合；再加入所述浇注料，振动成型，养护，脱模，得到透气砖坯体。Step 3: Fixing a polyurethane sponge at the bottom of the ventilating brick mold, the central axis of the urethane sponge is coincident with the central axis of the permeable brick mold; adding the casting material, vibrating forming, curing, demoulding, and obtaining a permeable brick body .
步骤四、将所述透气砖坯体置入高温炉内，以0.5～3℃/min的速率升温至600～700℃，保温1～3h；再以2～5℃/min的速率升温至1500～1600℃，保温3～5h；随炉冷却至室温，即得弥散型刚玉-尖晶石透气砖。Step 4: placing the permeable brick body into a high-temperature furnace, raising the temperature to 600-700 ° C at a rate of 0.5 to 3 ° C / min, holding for 1 to 3 hours; and then heating to 1500 ° at a rate of 2 to 5 ° C / min 1600 ° C, heat preservation 3 ~ 5h; with the furnace cooled to room temperature, that is, the dispersion type corundum - spinel permeable brick.
所述聚氨酯海绵呈圆锥台状，聚氨酯海绵的高度为透气砖高度的1.1～1.2倍，聚氨酯海绵的任一横截面直径均为透气砖等高处对应横截面直径的0.7～0.9倍；所述聚氨酯海绵的平均孔径为10～20PPI。The polyurethane sponge has a truncated cone shape, the height of the polyurethane sponge is 1.1 to 1.2 times the height of the gas permeable brick, and any cross-sectional diameter of the polyurethane sponge is 0.7 to 0.9 times the diameter of the corresponding cross-sectional diameter of the gas-permeable brick; The polyurethane sponge has an average pore diameter of 10 to 20 PPI.
所述致密烧结刚玉颗粒的粒度为2～4mm；所述结合剂为铝酸钙水泥。The dense sintered corundum particles have a particle size of 2 to 4 mm; and the binder is calcium aluminate cement.
本实施例2制备的弥散型刚玉-尖晶石透气砖经检测：常温耐压强度为163～170MPa；1100℃水冷循环次数为5～6次；所述弥散型刚玉-尖晶石透气砖的通气量为 14～18m 3/h·0.3MPa。 The diffused corundum-spinel permeable brick prepared in the second embodiment has been tested: normal temperature compressive strength is 163-170 MPa; 1100 ° C water cooling cycle is 5-6 times; the diffused corundum-spinel permeable brick The ventilation amount is 14 to 18 m 3 /h·0.3 MPa.
实施例3Example 3
一种弥散型刚玉-尖晶石透气砖及其制备方法。本实施例所述制备方法的具体步骤是：A dispersive corundum-spinel permeable brick and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:
步骤一、弥散型刚玉-尖晶石透气砖的原料成分及其含量是：电熔白刚玉颗粒为60～65wt％，致密烧结刚玉细粉为30～35wt％，氧化铬微粉为5～7wt％。Step 1. The raw material composition and content of the dispersed corundum-spinel permeable brick are: 60-65 wt% of fused white corundum particles, 30-35 wt% of dense sintered corundum fine powder, and 5-7 wt% of chromium oxide fine powder. .
步骤二、按所述原料成分及其含量将原料混合，得混合料；再向所述混合料中加入2～6wt％的结合剂、0.05～1wt％的聚羧酸盐和4～6wt％的水，搅拌15～30min，制得浇注料。Step 2: mixing the raw materials according to the raw material components and their contents to obtain a mixture; adding 2-6 wt% of the binder, 0.05-1 wt% of the polycarboxylate and 4-6 wt% to the mixture. Water, stir for 15 to 30 minutes to prepare a castable.
步骤三、在透气砖模具底部固定有聚氨酯海绵，所述聚氨酯海绵的中轴线与所述透气砖模具的中轴线重合；再加入所述浇注料，振动成型，养护，脱模，得到透气砖坯体。Step 3: Fixing a polyurethane sponge at the bottom of the ventilating brick mold, the central axis of the urethane sponge is coincident with the central axis of the permeable brick mold; adding the casting material, vibrating forming, curing, demoulding, and obtaining a permeable brick body .
步骤四、将所述透气砖坯体置入高温炉内，以0.5～3℃/min的速率升温至600～700℃，保温1～3h；再以2～5℃/min的速率升温至1500～1600℃，保温3～5h；随炉冷却至室温，即得弥散型刚玉-尖晶石透气砖。Step 4: placing the permeable brick body into a high-temperature furnace, raising the temperature to 600-700 ° C at a rate of 0.5 to 3 ° C / min, holding for 1 to 3 hours; and then heating to 1500 ° at a rate of 2 to 5 ° C / min 1600 ° C, heat preservation 3 ~ 5h; with the furnace cooled to room temperature, that is, the dispersion type corundum - spinel permeable brick.
所述聚氨酯海绵呈圆锥台状，聚氨酯海绵的高度为透气砖高度的1.1～1.2倍，聚氨酯海绵的任一横截面直径均为透气砖等高处对应横截面直径的0.7～0.9倍；所述聚氨酯海绵的平均孔径为15～25PPI。The polyurethane sponge has a truncated cone shape, the height of the polyurethane sponge is 1.1 to 1.2 times the height of the gas permeable brick, and any cross-sectional diameter of the polyurethane sponge is 0.7 to 0.9 times the diameter of the corresponding cross-sectional diameter of the gas-permeable brick; The polyurethane sponge has an average pore diameter of 15 to 25 PPI.
所述电熔白刚玉颗粒的粒度为2～3mm；所述结合剂为溶胶。The fused white corundum particles have a particle size of 2 to 3 mm; the binder is a sol.
本实施例3制备的弥散型刚玉-尖晶石透气砖经检测：常温耐压强度为168～175MPa；1100℃水冷循环次数为6～7次；所述弥散型刚玉-尖晶石透气砖的通气量为15～20m 3/h·0.3MPa。 The diffused corundum-spinel permeable brick prepared in the third embodiment has been tested: the normal temperature compressive strength is 168-175 MPa; the 1100 °C water cooling cycle is 6-7 times; the diffused corundum-spinel permeable brick The ventilation amount is 15 to 20 m 3 /h·0.3 MPa.
实施例4Example 4
一种弥散型刚玉-尖晶石透气砖及其制备方法。本实施例所述制备方法的具体步骤是：A dispersive corundum-spinel permeable brick and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:
步骤一、弥散型刚玉-尖晶石透气砖的原料成分及其含量是：电熔白刚玉颗粒为60～65wt％，电熔白刚玉细粉为30～35wt％，氧化铬微粉为5～7wt％。Step 1. The raw material composition and content of the dispersed corundum-spinel permeable brick are: 60-65 wt% of fused white corundum granules, 30-35 wt% of fused white corundum fine powder, and 5-7 wt of chrome oxide fine powder. %.
步骤二、按所述原料成分及其含量将原料混合，得混合料；再向所述混合料中加入2～6wt％的结合剂、0.05～1wt％的聚羧酸盐和4～6wt％的水，搅拌15～30min，制得浇注料。Step 2: mixing the raw materials according to the raw material components and their contents to obtain a mixture; adding 2-6 wt% of the binder, 0.05-1 wt% of the polycarboxylate and 4-6 wt% to the mixture. Water, stir for 15 to 30 minutes to prepare a castable.
步骤三、在透气砖模具底部固定有聚氨酯海绵，所述聚氨酯海绵的中轴线与所述透气砖模具的中轴线重合；再加入所述浇注料，振动成型，养护，脱模，得到透气砖坯体。Step 3: Fixing a polyurethane sponge at the bottom of the ventilating brick mold, the central axis of the urethane sponge is coincident with the central axis of the permeable brick mold; adding the casting material, vibrating forming, curing, demoulding, and obtaining a permeable brick body .
步骤四、将所述透气砖坯体置入高温炉内，以0.5～3℃/min的速率升温至600～700℃，保温1～3h；再以2～5℃/min的速率升温至1500～1600℃，保温3～5h；随炉冷却至室温，即得弥散型刚玉-尖晶石透气砖。Step 4: placing the permeable brick body into a high-temperature furnace, raising the temperature to 600-700 ° C at a rate of 0.5 to 3 ° C / min, holding for 1 to 3 hours; and then heating to 1500 ° at a rate of 2 to 5 ° C / min 1600 ° C, heat preservation 3 ~ 5h; with the furnace cooled to room temperature, that is, the dispersion type corundum - spinel permeable brick.
所述聚氨酯海绵呈圆锥台状，聚氨酯海绵的高度为透气砖高度的1.1～1.2倍，聚氨酯海绵的任一横截面直径均为透气砖等高处对应横截面直径的0.7～0.9倍；所述聚氨酯海绵的平均孔径为20～30PPI。The polyurethane sponge has a truncated cone shape, the height of the polyurethane sponge is 1.1 to 1.2 times the height of the gas permeable brick, and any cross-sectional diameter of the polyurethane sponge is 0.7 to 0.9 times the diameter of the corresponding cross-sectional diameter of the gas-permeable brick; The polyurethane sponge has an average pore diameter of 20 to 30 PPI.
所述电熔白刚玉颗粒的粒度为2～3mm；所述结合剂为铝酸钙水泥。The fused white corundum particles have a particle size of 2 to 3 mm; and the binder is calcium aluminate cement.
本实施例4制备的弥散型刚玉-尖晶石透气砖经检测：常温耐压强度为160～173MPa；1100℃水冷循环次数为5～6次；所述弥散型刚玉-尖晶石透气砖的通气量为16～20m 3/h·0.3MPa。 The diffused corundum-spinel permeable brick prepared in the fourth embodiment has been tested: normal temperature compressive strength is 160-173 MPa; 1100 ° C water cooling cycle is 5-6 times; the diffused corundum-spinel permeable brick The ventilation amount is 16 to 20 m 3 /h·0.3 MPa.
实施例5Example 5
一种弥散型刚玉-尖晶石透气砖及其制备方法。本实施例所述制备方法的具体步骤是：A dispersive corundum-spinel permeable brick and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:
步骤一、弥散型刚玉-尖晶石透气砖的原料成分及其含量是：致密烧结刚玉颗粒为65～70wt％，致密烧结刚玉细粉为25～30wt％，氧化镁微粉为2～5wt％。Step 1. The raw material composition and content of the dispersed corundum-spinel permeable brick are: 65 to 70 wt% of the dense sintered corundum particles, 25 to 30 wt% of the dense sintered corundum fine powder, and 2 to 5 wt% of the magnesium oxide fine powder.
步骤二、按所述原料成分及其含量将原料混合，得混合料；再向所述混合料中加入2～6wt％的结合剂、0.05～1wt％的聚羧酸盐和4～6wt％的水，搅拌15～30min，制得浇注料。Step 2: mixing the raw materials according to the raw material components and their contents to obtain a mixture; adding 2-6 wt% of the binder, 0.05-1 wt% of the polycarboxylate and 4-6 wt% to the mixture. Water, stir for 15 to 30 minutes to prepare a castable.
步骤三、在透气砖模具底部固定有聚氨酯海绵，所述聚氨酯海绵的中轴线与所述透气砖模具的中轴线重合；再加入所述浇注料，振动成型，养护，脱模，得到透气砖坯体。Step 3: Fixing a polyurethane sponge at the bottom of the ventilating brick mold, the central axis of the urethane sponge is coincident with the central axis of the permeable brick mold; adding the casting material, vibrating forming, curing, demoulding, and obtaining a permeable brick body .
步骤四、将所述透气砖坯体置入高温炉内，以0.5～3℃/min的速率升温至700～800℃，保温1～3h；再以2～5℃/min的速率升温至1600～1700℃，保温3～5h；随炉冷却至室温，即得弥散型刚玉-尖晶石透气砖。Step 4: placing the permeable brick body into a high-temperature furnace, raising the temperature to 700-800 ° C at a rate of 0.5 to 3 ° C / min, maintaining the temperature for 1 to 3 h; and then raising the temperature to 1600 ° at a rate of 2 to 5 ° C / min. 1700 ° C, heat preservation 3 ~ 5h; with the furnace cooled to room temperature, that is, the dispersion type corundum - spinel permeable brick.
所述聚氨酯海绵呈圆锥台状，聚氨酯海绵的高度为透气砖高度的1.1～1.2倍，聚氨酯海绵的任一横截面直径均为透气砖等高处对应横截面直径的0.7～0.9倍；所述聚氨酯海绵的平均孔径为5～10PPI。The polyurethane sponge has a truncated cone shape, the height of the polyurethane sponge is 1.1 to 1.2 times the height of the gas permeable brick, and any cross-sectional diameter of the polyurethane sponge is 0.7 to 0.9 times the diameter of the corresponding cross-sectional diameter of the gas-permeable brick; The polyurethane sponge has an average pore diameter of 5 to 10 PPI.
所述致密烧结刚玉颗粒的粒度为3～5mm；所述结合剂为溶胶。本实施例5制备的弥散型刚玉-尖晶石透气砖经检测：常温耐压强度为175～188MPa；1100℃水冷循环次数为6～7次；所述弥散型刚玉-尖晶石透气砖的通气量为13～16m 3/h·0.3MPa。 The dense sintered corundum particles have a particle size of 3 to 5 mm; the binder is a sol. The diffused corundum-spinel permeable brick prepared in the fifth embodiment has been tested: the normal temperature compressive strength is 175-188 MPa; the 1100 °C water cooling cycle is 6-7 times; the diffused corundum-spinel permeable brick The ventilation amount is 13 to 16 m 3 /h·0.3 MPa.
实施例6Example 6
一种弥散型刚玉-尖晶石透气砖及其制备方法。本实施例所述制备方法的具体步骤是：A dispersive corundum-spinel permeable brick and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:
步骤一、弥散型刚玉-尖晶石透气砖的原料成分及其含量是：致密烧结刚玉颗粒为65～70wt％，电熔白刚玉细粉为25～30wt％，氧化镁微粉为2～5wt％。Step 1. The raw material composition and content of the dispersed corundum-spinel permeable brick are: 65 to 70 wt% of the dense sintered corundum particles, 25 to 30 wt% of the fused white corundum fine powder, and 2 to 5 wt% of the magnesium oxide fine powder. .
步骤二、按所述原料成分及其含量将原料混合，得混合料；再向所述混合料中加入2～6wt％的结合剂、0.05～1wt％的聚羧酸盐和4～6wt％的水，搅拌15～30min，制得浇注料。Step 2: mixing the raw materials according to the raw material components and their contents to obtain a mixture; adding 2-6 wt% of the binder, 0.05-1 wt% of the polycarboxylate and 4-6 wt% to the mixture. Water, stir for 15 to 30 minutes to prepare a castable.
步骤三、在透气砖模具底部固定有聚氨酯海绵，所述聚氨酯海绵的中轴线与所述透气砖模具的中轴线重合；再加入所述浇注料，振动成型，养护，脱模，得到透气砖坯体。Step 3: Fixing a polyurethane sponge at the bottom of the ventilating brick mold, the central axis of the urethane sponge is coincident with the central axis of the permeable brick mold; adding the casting material, vibrating forming, curing, demoulding, and obtaining a permeable brick body .
步骤四、将所述透气砖坯体置入高温炉内，以0.5～3℃/min的速率升温至700～800℃，保温1～3h；再以2～5℃/min的速率升温至1600～1700℃，保温3～5h；随炉冷却至室温，即得弥散型刚玉-尖晶石透气砖。Step 4: placing the permeable brick body into a high-temperature furnace, raising the temperature to 700-800 ° C at a rate of 0.5 to 3 ° C / min, maintaining the temperature for 1 to 3 h; and then raising the temperature to 1600 ° at a rate of 2 to 5 ° C / min. 1700 ° C, heat preservation 3 ~ 5h; with the furnace cooled to room temperature, that is, the dispersion type corundum - spinel permeable brick.
所述聚氨酯海绵呈圆锥台状，聚氨酯海绵的高度为透气砖高度的1.1～1.2倍，聚氨酯海绵的任一横截面直径均为透气砖等高处对应横截面直径的0.7～0.9倍；所述聚氨酯海绵的平均孔径为8～15PPI。The polyurethane sponge has a truncated cone shape, the height of the polyurethane sponge is 1.1 to 1.2 times the height of the gas permeable brick, and any cross-sectional diameter of the polyurethane sponge is 0.7 to 0.9 times the diameter of the corresponding cross-sectional diameter of the gas-permeable brick; The polyurethane sponge has an average pore diameter of 8 to 15 PPI.
所述致密烧结刚玉颗粒的粒度为2～4mm；所述结合剂为铝酸钙水泥。The dense sintered corundum particles have a particle size of 2 to 4 mm; and the binder is calcium aluminate cement.
本实施例6制备的弥散型刚玉-尖晶石透气砖经检测：常温耐压强度为170～186MPa；1100℃水冷循环次数为5～6次；所述弥散型刚玉-尖晶石透气砖的通气量为14～18m 3/h·0.3MPa。 The dispersion type corundum-spinel permeable brick prepared in the sixth embodiment has been tested: the normal temperature compressive strength is 170-186 MPa; the 1100 ° C water cooling cycle is 5-6 times; the diffused corundum-spinel permeable brick The ventilation amount is 14 to 18 m 3 /h·0.3 MPa.
实施例7Example 7
一种弥散型刚玉-尖晶石透气砖及其制备方法。本实施例所述制备方法的具体步骤是：A dispersive corundum-spinel permeable brick and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:
步骤一、弥散型刚玉-尖晶石透气砖的原料成分及其含量是：电熔白刚玉颗粒为65～70wt％，致密烧结刚玉细粉为25～30wt％，氧化铬微粉为2～5wt％。Step 1. The raw material composition and content of the dispersed corundum-spinel permeable brick are: 65-70 wt% of fused white corundum particles, 25-30 wt% of dense sintered corundum powder, and 2-5 wt% of chromium oxide fine powder. .
步骤二、按所述原料成分及其含量将原料混合，得混合料；再向所述混合料中加入2～6wt％的结合剂、0.05～1wt％的聚羧酸盐和4～6wt％的水，搅拌15～30min，制得浇注料。Step 2: mixing the raw materials according to the raw material components and their contents to obtain a mixture; adding 2-6 wt% of the binder, 0.05-1 wt% of the polycarboxylate and 4-6 wt% to the mixture. Water, stir for 15 to 30 minutes to prepare a castable.
步骤三、在透气砖模具底部固定有聚氨酯海绵，所述聚氨酯海绵的中轴线与所述透气砖模具的中轴线重合；再加入所述浇注料，振动成型，养护，脱模，得到透气砖坯体。Step 3: Fixing a polyurethane sponge at the bottom of the ventilating brick mold, the central axis of the urethane sponge is coincident with the central axis of the permeable brick mold; adding the casting material, vibrating forming, curing, demoulding, and obtaining a permeable brick body .
步骤四、将所述透气砖坯体置入高温炉内，以0.5～3℃/min的速率升温至700～800℃，保温1～3h；再以2～5℃/min的速率升温至1600～1700℃，保温3～5h；随炉冷却至室温，即得弥散型刚玉-尖晶石透气砖。Step 4: placing the permeable brick body into a high-temperature furnace, raising the temperature to 700-800 ° C at a rate of 0.5 to 3 ° C / min, maintaining the temperature for 1 to 3 h; and then raising the temperature to 1600 ° at a rate of 2 to 5 ° C / min. 1700 ° C, heat preservation 3 ~ 5h; with the furnace cooled to room temperature, that is, the dispersion type corundum - spinel permeable brick.
所述聚氨酯海绵呈圆锥台状，聚氨酯海绵的高度为透气砖高度的1.1～1.2倍，聚氨酯海绵的任一横截面直径均为透气砖等高处对应横截面直径的0.7～0.9倍；所述聚氨酯海绵的平均孔径为15～25PPI。The polyurethane sponge has a truncated cone shape, the height of the polyurethane sponge is 1.1 to 1.2 times the height of the gas permeable brick, and any cross-sectional diameter of the polyurethane sponge is 0.7 to 0.9 times the diameter of the corresponding cross-sectional diameter of the gas-permeable brick; The polyurethane sponge has an average pore diameter of 15 to 25 PPI.
所述电熔白刚玉颗粒的粒度为2～3mm；所述结合剂为溶胶。The fused white corundum particles have a particle size of 2 to 3 mm; the binder is a sol.
本实施例6制备的弥散型刚玉-尖晶石透气砖经检测：常温耐压强度为170～180MPa；1100℃水冷循环次数为5～6次；所述弥散型刚玉-尖晶石透气砖的通气量为16～20m 3/h·0.3MPa。 The dispersion type corundum-spinel permeable brick prepared in the sixth embodiment has been tested: the normal temperature compressive strength is 170-180 MPa; the 1100 °C water cooling cycle is 5-6 times; the diffused corundum-spinel permeable brick The ventilation amount is 16 to 20 m 3 /h·0.3 MPa.
实施例8Example 8
一种弥散型刚玉-尖晶石透气砖及其制备方法。本实施例所述制备方法的具体步骤是：A dispersive corundum-spinel permeable brick and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:
步骤一、弥散型刚玉-尖晶石透气砖的原料成分及其含量是：电熔白刚玉颗粒为65～70wt％，电熔白刚玉细粉为25～30wt％，氧化铬微粉为2～5wt％。Step 1. The raw material composition and content of the dispersed corundum-spinel permeable brick are: 65-70 wt% of fused white corundum particles, 25-30 wt% of fused white corundum fine powder, and 2-5 wt of chromium oxide fine powder. %.
步骤二、按所述原料成分及其含量将原料混合，得混合料；再向所述混合料中加入2～6wt％的结合剂、0.05～1wt％的聚羧酸盐和4～6wt％的水，搅拌15～30min，制得浇注料。Step 2: mixing the raw materials according to the raw material components and their contents to obtain a mixture; adding 2-6 wt% of the binder, 0.05-1 wt% of the polycarboxylate and 4-6 wt% to the mixture. Water, stir for 15 to 30 minutes to prepare a castable.
步骤三、在透气砖模具底部固定有聚氨酯海绵，所述聚氨酯海绵的中轴线与所述透气砖模具的中轴线重合；再加入所述浇注料，振动成型，养护，脱模，得到透气砖坯体。Step 3: Fixing a polyurethane sponge at the bottom of the ventilating brick mold, the central axis of the urethane sponge is coincident with the central axis of the permeable brick mold; adding the casting material, vibrating forming, curing, demoulding, and obtaining a permeable brick body .
步骤四、将所述透气砖坯体置入高温炉内，以0.5～3℃/min的速率升温至700～800℃，保温1～3h；再以2～5℃/min的速率升温至1600～1700℃，保温3～5h；随炉冷却至室温，即得弥散型刚玉-尖晶石透气砖。Step 4: placing the permeable brick body into a high-temperature furnace, raising the temperature to 700-800 ° C at a rate of 0.5 to 3 ° C / min, maintaining the temperature for 1 to 3 h; and then raising the temperature to 1600 ° at a rate of 2 to 5 ° C / min. 1700 ° C, heat preservation 3 ~ 5h; with the furnace cooled to room temperature, that is, the dispersion type corundum - spinel permeable brick.
所述聚氨酯海绵呈圆锥台状，聚氨酯海绵的高度为透气砖高度的1.1～1.2倍，聚氨酯海绵的任一横截面直径均为透气砖等高处对应横截面直径的0.7～0.9倍；所述聚氨酯海绵的平均孔径为20～30PPI。The polyurethane sponge has a truncated cone shape, the height of the polyurethane sponge is 1.1 to 1.2 times the height of the gas permeable brick, and any cross-sectional diameter of the polyurethane sponge is 0.7 to 0.9 times the diameter of the corresponding cross-sectional diameter of the gas-permeable brick; The polyurethane sponge has an average pore diameter of 20 to 30 PPI.
所述电熔白刚玉颗粒的粒度为2～3mm；所述结合剂为铝酸钙水泥。The fused white corundum particles have a particle size of 2 to 3 mm; and the binder is calcium aluminate cement.
本实施例6制备的弥散型刚玉-尖晶石透气砖经检测：常温耐压强度为165～178MPa；1100℃水冷循环次数为5～6次；所述弥散型刚玉-尖晶石透气砖的通气量为16～20m 3/h·0.3MPa。 The diffused corundum-spinel permeable brick prepared in the sixth embodiment has been tested: the normal temperature compressive strength is 165-178 MPa; the 1100 °C water cooling cycle is 5-6 times; the diffused corundum-spinel permeable brick The ventilation amount is 16 to 20 m 3 /h·0.3 MPa.
本具体实施方式与现有技术相比，具有如下积极效果：Compared with the prior art, the specific embodiment has the following positive effects:
本具体实施方式将聚氨酯海绵固定在透气砖模具的中心位置处，再注入搅拌均匀的浇注料，经振动成型、养护和脱模，然后经600～800℃保温1～3h和1500～1700℃保温3～5h烧成，制得弥散型刚玉-尖晶石透气砖，工艺简单和成本低。由于本具体实施方式基于整体浇注—燃尽物模板技术，不涉及多层复合结构以及颗粒的非紧密堆积成孔，故所制备的弥散型刚玉-尖晶石透气砖整体性好、强度高、抗热震性优良和通气量大。In the specific embodiment, the polyurethane sponge is fixed at the center of the ventilating brick mold, and then the uniformly poured castable material is injected, vibrated, cured and demolded, and then insulated at 600-800 ° C for 1 to 3 h and 1500 to 1700 ° C. After 3 to 5 hours of firing, a diffused corundum-spinel permeable brick is obtained, which is simple in process and low in cost. Since the specific embodiment is based on the integral casting-burning template technology, the multi-layer composite structure and the non-close packing of the particles are not involved, so the prepared corundum-spinel permeable brick has good integrity and high strength. Excellent thermal shock resistance and high ventilation.
本具体实施方式将聚氨酯海绵作为造孔模板，与浇注料浇注为整体，然后经高温烧成。在弥散型刚玉-尖晶石透气砖的烧制过程采用两个温度段：一是低温段，聚氨酯于500～700℃会发生分解、挥发并排出，在浇注料中遗留下聚氨酯本身的结构。作为模板的聚氨酯海绵的三维网状结构，其加热过程中的烧失赋予弥散型刚玉-尖晶石透气砖具有良好的通气性。聚氨酯海绵网状结构的均匀分布，能使弥散型刚玉-尖晶石透气砖形成分散性好的通孔，所形成的气泡群能充分对钢液进行搅拌。二是高温段，当高温烧成时，经浇注成型的弥散型刚玉-尖晶石透气砖会发生烧结行为，赋予材料足够的强度和整体性，弥散型刚玉-尖晶石透气砖在高温烧成时，其体积存在一定程度的收缩，能降低弥散型刚玉-尖晶石透气砖通孔的孔径，进而对抗渗透和侵蚀有积极作用；更重要的是，弥散型刚玉-尖晶石透气砖内部存在孔径细小的通孔，能钝化和终止因冷热循环时产生的裂纹，显著提高弥散型刚玉-尖晶石透气砖的抗热震性能。本具体实施方式制备的弥散型刚玉-尖晶石透气砖因整体浇注成型，较机压成型的弥散型透气砖能显著地降低成本和简化工艺。In the specific embodiment, the polyurethane sponge is used as a pore-forming template, casted integrally with the castable, and then fired at a high temperature. In the firing process of the dispersion type corundum-spinel permeable brick, two temperature sections are used: one is the low temperature section, and the polyurethane is decomposed, volatilized and discharged at 500 to 700 ° C, leaving the structure of the polyurethane itself in the castable. As a template of the three-dimensional network structure of the polyurethane sponge, the loss of heat during heating imparts good air permeability to the dispersed corundum-spinel permeable brick. The uniform distribution of the polyurethane sponge network structure enables the dispersed corundum-spinel permeable brick to form a well-distributed through hole, and the formed bubble group can fully stir the molten steel. The second is the high temperature section. When the high temperature is fired, the cast-type dispersive corundum-spinel permeable brick will be sintered, giving the material sufficient strength and integrity. The dispersed corundum-spinel permeable brick is burnt at high temperature. When it is formed, its volume has a certain degree of shrinkage, which can reduce the pore size of the diffused corundum-spinel permeable brick through hole, and thus has a positive effect against penetration and erosion; more importantly, the diffused corundum-spinel permeable brick There is a through hole with a small aperture inside, which can passivate and terminate the crack generated during the thermal cycle, and significantly improve the thermal shock resistance of the dispersed corundum-spinel permeable brick. The diffused corundum-spinel permeable brick prepared by the specific embodiment is formed by integral casting, and the machined and formed diffused permeable brick can significantly reduce the cost and simplify the process.
本具体实施方式制备的弥散型刚玉-尖晶石透气砖经检测：常温耐压强度为160～190MPa；1100℃水冷循环次数为5～7次；所述弥散型刚玉-尖晶石透气砖的通气量为13～20m 3/h·0.3MPa。 The diffused corundum-spinel permeable brick prepared by the specific embodiment is tested: the normal temperature compressive strength is 160-190 MPa; the 1100 °C water cooling cycle is 5-7 times; the diffused corundum-spinel permeable brick The ventilation amount is 13 to 20 m 3 /h·0.3 MPa.
因此，本具体实施方式具有工艺简单和成本低的特点，所制备的弥散型刚玉-尖晶石透气砖通孔分布均匀、整体性好、强度高和抗热震性优良。Therefore, the specific embodiment has the characteristics of simple process and low cost, and the prepared diffused corundum-spinel permeable brick has uniform through hole distribution, good integrity, high strength and excellent thermal shock resistance.

Claims (6)

  1. 一种弥散型刚玉-尖晶石透气砖的制备方法，其特征在于所述制备方法的步骤是：A method for preparing a dispersion type corundum-spinel permeable brick, characterized in that the steps of the preparation method are:
    步骤一、弥散型刚玉-尖晶石透气砖的原料成分及其含量是：致密烧结刚玉颗粒或电熔白刚玉颗粒为60～70wt％，致密烧结刚玉细粉或电熔白刚玉细粉为25～35wt％，氧化镁微粉或氧化铬微粉为2～7wt％；Step 1. The raw material composition and content of the dispersed corundum-spinel permeable brick are: 60-70 wt% of dense sintered corundum granules or fused white corundum granules, and compact sintered corundum fine powder or fused white corundum fine powder is 25 ～35wt%, magnesium oxide fine powder or chromium oxide fine powder is 2-7 wt%;
    步骤二、按所述原料成分及其含量将原料混合，得混合料；再向所述混合料中加入2～6wt％的结合剂、0.05～1wt％的聚羧酸盐和4～6wt％的水，搅拌15～30min，制得浇注料；Step 2: mixing the raw materials according to the raw material components and their contents to obtain a mixture; adding 2-6 wt% of the binder, 0.05-1 wt% of the polycarboxylate and 4-6 wt% to the mixture. Water, stirring for 15 to 30 minutes, to obtain a castable;
    步骤三、在透气砖模具底部固定有聚氨酯海绵，所述聚氨酯海绵的中轴线与所述透气砖模具的中轴线重合；再加入所述浇注料，振动成型，养护，脱模，得到透气砖坯体；Step 3: Fixing a polyurethane sponge at the bottom of the ventilating brick mold, the central axis of the urethane sponge is coincident with the central axis of the permeable brick mold; adding the casting material, vibrating forming, curing, demoulding, and obtaining a permeable brick body ;
    步骤四、将所述透气砖坯体置入高温炉内，以0.5～3℃/min的速率升温至600～800℃，保温1～3h；再以2～5℃/min的速率升温至1500～1700℃，保温3～5h；随炉冷却至室温，即得弥散型刚玉-尖晶石透气砖；Step 4: placing the permeable brick body into a high-temperature furnace, raising the temperature to 600-800 ° C at a rate of 0.5 to 3 ° C / min, holding for 1 to 3 hours; and heating to 1500 ° at a rate of 2 to 5 ° C / min 1700 ° C, heat preservation 3 ~ 5h; with the furnace cooled to room temperature, that is, the dispersion type corundum - spinel permeable brick;
    所述聚氨酯海绵呈圆锥台状，聚氨酯海绵的高度为透气砖高度的1.1～1.2倍，聚氨酯海绵的任一横截面直径均为透气砖等高处对应横截面直径的0.7～0.9倍；所述聚氨酯海绵的平均孔径为5～30PPI。The polyurethane sponge has a truncated cone shape, the height of the polyurethane sponge is 1.1 to 1.2 times the height of the gas permeable brick, and any cross-sectional diameter of the polyurethane sponge is 0.7 to 0.9 times the diameter of the corresponding cross-sectional diameter of the gas-permeable brick; The polyurethane sponge has an average pore diameter of 5 to 30 PPI.
  2. 如权利要求1所述的弥散型刚玉-尖晶石透气砖的制备方法，其特征在于所述致密烧结刚玉颗粒或电熔白刚玉颗粒的Al 2O 3含量≥97wt％；所述致密烧结刚玉颗粒或电熔白刚玉颗粒的粒度为2～5mm。 The method for preparing a dispersion type corundum-spinel permeable brick according to claim 1, wherein said dense sintered corundum particles or fused white corundum particles have an Al 2 O 3 content of ≥97 wt%; said dense sintered corundum The particle size of the granules or fused white corundum particles is 2 to 5 mm.
  3. 如权利要求1所述的弥散型刚玉-尖晶石透气砖的制备方法，其特征在于所述致密烧结刚玉细粉或电熔白刚玉细粉的Al 2O 3含量≥97wt％；所述致密烧结刚玉细粉或电熔白刚玉细粉的粒度为0.1～1mm。 The method for preparing a dispersion type corundum-spinel permeable brick according to claim 1, wherein the dense sintered corundum fine powder or the fused white corundum fine powder has an Al 2 O 3 content of ≥97 wt%; The sintered corundum fine powder or the fused white corundum fine powder has a particle size of 0.1 to 1 mm.
  4. 如权利要求1所述的弥散型刚玉-尖晶石透气砖的制备方法，其特征在于所述氧化镁微粉或氧化铬微粉的粒度≤0.088mm。The method for preparing a dispersion type corundum-spinel permeable brick according to claim 1, wherein the magnesium oxide fine powder or the chromium oxide fine powder has a particle size of ≤0.088 mm.
  5. 如权利要求1所述的弥散型刚玉-尖晶石透气砖的制备方法，其特征在于所述结合剂为溶胶或为铝酸钙水泥。The method for preparing a dispersion type corundum-spinel permeable brick according to claim 1, wherein the binder is a sol or a calcium aluminate cement.
  6. 一种弥散型刚玉-尖晶石透气砖，其特征在于所述弥散型刚玉-尖晶石透气砖是根据权利要求1～5项中任一项所述弥散型刚玉-尖晶石透气砖的制备方法所制备的弥散型刚玉-尖晶石透气砖。A dispersive corundum-spinel permeable brick characterized by the dispersive corundum-spinel permeable brick according to any one of claims 1 to 5 The dispersion type corundum-spinel permeable brick prepared by the preparation method.
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