CN112624743A - Sliding plate brick for slag blocking of converter steel tapping hole formed by casting and production method - Google Patents
Sliding plate brick for slag blocking of converter steel tapping hole formed by casting and production method Download PDFInfo
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- CN112624743A CN112624743A CN202010853939.8A CN202010853939A CN112624743A CN 112624743 A CN112624743 A CN 112624743A CN 202010853939 A CN202010853939 A CN 202010853939A CN 112624743 A CN112624743 A CN 112624743A
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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
- 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
- C04B35/101—Refractories from grain sized mixtures
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4653—Tapholes; Opening or plugging thereof
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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
- 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
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
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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
- 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
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3817—Carbides
- C04B2235/3826—Silicon carbides
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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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
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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
- 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
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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
- 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
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
Abstract
The invention provides a sliding plate brick for blocking slag at a converter steel tapping hole, which is cast and molded and comprises the following raw materials: 65-78% of tabular corundum, 8-12% of magnesium-rich spinel, 3-7% of silicon carbide, 6-10% of alpha-alumina micro powder, 1-2% of pure calcium aluminate cement, 3-6% of rho-alumina micro powder and 0.05-0.2% of water reducing agent. During production, the raw materials and the water reducing agent are weighed and stirred by a stirrer to obtain pug, the pug is cast, vibrated and formed, the pug is demoulded after being maintained for 24 hours, and the pug is ground and coated after being dried at the temperature of 300 +/-10 ℃ to obtain the product of the invention. The sliding plate brick has the advantages of excellent integrity, good erosion resistance, stripping resistance and thermal shock stability, high strength and good service performance.
Description
Technical Field
The invention relates to a sliding plate brick for blocking slag at a converter steel tapping hole by casting molding and a production method thereof, belonging to the technical field of refractory materials.
Background
With the change of the consumption structure of steel products, special steel produced by the converter is concerned by a plurality of enterprises. The quality of the slag-stopping effect of the converter has direct influence on the quality of steel, and the converter sliding plate slag-stopping technology has the characteristics of rapid slag-stopping operation reaction and high slag-stopping efficiency, is a new technology for converter slag-stopping, and is used by domestic and foreign varieties of steel and large-scale steel ladles for smelting. However, the special smelting environment of the converter, particularly the production of high value-added products such as IF steel, petroleum pipeline steel, bearing steel, spring steel and the like, puts more severe requirements on the sliding plate of the steel outlet.
At present, the material of the steel-tapping hole sliding plate generally uses sintered aluminum zirconium carbon, the carbon content is generally 6-10%, the carbon content is higher, the use time is 10-15 times, the later oxidation occurs, the air holes of the sliding plate brick are increased, the structure is loose, the strength is reduced, the steel flowing holes of the upper sliding plate are eroded and washed by molten steel and steel slag, and the expanding rate is high; the sliding stopping area of the lower sliding plate is subjected to melting loss and oxidation of high-temperature flame, and the plate surface is delaminated and peeled off. In order to meet the requirement of 18-20 furnaces and even more than 25 furnaces on long service life, which is proposed by iron and steel enterprises, the sliding plate is made of a fired aluminum zirconium carbon sliding plate from a conventional fired aluminum zirconium carbon to the body, and the insert is in a composite structure of a zirconium plate.
Although the service life of the sliding plate inlaid with the zirconium plate is prolonged to a certain extent compared with the service life of the conventional sintered aluminum zirconium carbon sliding plate, the service life is stabilized in a 15-18 furnace, the complexity of the production process is increased, and the zirconium plate needs to be inlaid by using fire clay. Meanwhile, the production cost is greatly increased. In addition, in the later stage of use, on one hand, the oxidation strength of the outer sleeve is easy to reduce, on the other hand, the size of the fire clay between the zirconium plate and the outer sleeve and the volume of the fire clay for sticking the box are shrunk, so that the zirconium plate and the outer sleeve are easy to move and break, the integrity and the service life are seriously influenced, and the zirconium plate cannot completely exert the excellent performances of corrosion resistance, scouring resistance, long service life and the like because the integrity cannot meet the long-time use requirement. Meanwhile, the potential safety hazard brought by the method is increased, more rigorous requirements are provided for the sliding water gap and mechanism operation and judgment personnel, and the method is not widely popularized at present. Therefore, the development of a converter tap hole sliding plate brick with high quality, low cost, safety and environmental protection is necessary.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a sliding plate brick for blocking slag at a converter steel-tapping hole formed by casting and a production method thereof, wherein the sliding plate brick consists of an inlay zirconium plate and a casting material jacket, wherein the zirconium plate is positioned in a working area of the sliding plate brick, and the obtained sliding plate brick has the characteristics of excellent integrity, good erosion resistance, good spalling resistance, high strength, good thermal shock stability, simple production process, short period, environmental protection and safe use.
In order to achieve the purpose, the invention adopts the technical scheme that:
a sliding plate brick for blocking slag at a converter steel tapping hole is molded by casting, and comprises the following raw materials in percentage by weight: 65-78% of tabular corundum, 8-12% of magnesium-rich spinel, 3-7% of silicon carbide, 6-10% of alpha-alumina micro powder, 1-2% of pure calcium aluminate cement, 3-6% of rho-alumina micro powder and a water reducing agent accounting for 0.05-0.2% of the total amount of the raw materials.
The plate-shaped corundum comprises granular materials and fine powder materials; wherein the particle size range is as follows: the granularity of 3mm < 1mm < 5mm, the granularity of 1mm < 2 mm < 3mm, the granularity of 0.5mm < 3mm < 1mm, the granularity of 0.044mm < 4mm < 0.5mm, and the granularity of 5 < 0.044 mm.
The weight ratio of different particle sizes is: particle size 1: particle size 2: particle size 3: particle size 4: the particle size is 5-10-15: 20-25: 15-20: 10-15: 5 to 10.
The particle size of the magnesium-rich spinel is less than or equal to 0.013 mm; the granularity of the pure calcium aluminate cement is less than or equal to 0.045 mm; the granularity of the silicon carbide is less than or equal to 1 mm.
The granularity of the alpha-alumina micro powder is as follows: d50 ═ 0.25 μm, model CL 370.
The rho-aluminaThe specific surface area of the fine powder was 200m2The grain size is less than or equal to 5 mu m.
The water reducing agent is a high-efficiency organic water reducing agent FS10 and FW10, wherein the using amount ratio of FS10 to FW10 is 1: 1.
The production method of the sliding plate brick comprises the following steps:
(1) the preparation process of the pug comprises the following steps:
weighing the raw materials and the water reducing agent according to the proportion, adding the raw materials into a stirrer, stirring for 1-2 min, adding the water reducing agent, continuing to stir for 3-5 min, uniformly mixing, adding water accounting for 4-6% of the total weight of the raw materials and the water reducing agent, and continuing to stir for 5-10 min to obtain pug;
(2) pouring, vibrating and molding:
fixing the zirconium plate and the steel shell of the mosaic body on a forming die, adding the prepared mud material into the steel shell, vibrating for 5-10 min, curing for 24h at room temperature after forming, demoulding to obtain a slide plate brick blank, and drying the blank for 36h at the temperature of 300 +/-10 ℃;
(3) and grinding and coating the dried slide plate brick blank to obtain the product of the invention.
The invention has the beneficial effects that:
the invention adopts corundum spinel castable to replace aluminum-zirconium carbon material, and MgO in magnesium-rich spinel and Al in the material are used at high temperature2O3The reaction, the normal position generates the spinel phase, produces the volume and expands a little, ensures the volume stability of body in the high temperature use on the one hand, on the other hand compensaties the volume shrink that the zirconium board produced because of the high temperature, improves the wholeness in the slide brick use. In addition, the silicon carbide is added into the raw materials, and the silicon carbide has the characteristics of strong chemical stability, high heat conductivity coefficient, small thermal expansion coefficient and good wear resistance, so that the volume stability and the thermal shock resistance of the body can be improved.
The invention adopts a composite bonding agent rho-alumina and pure calcium aluminate cement, wherein the rho-alumina is used as a transitional oxide and can generate hydration reaction to generate bayerite which can generate bonding effect with boehmite gel and can be converted into alpha-alumina at high temperature to form firm ceramic bonding; the problem of poor medium-temperature strength of rho-alumina can be solved by compositely adding pure calcium aluminate cement, so that the rho-alumina has the characteristic of excellent medium-temperature and high-temperature strength, and the comprehensive performance of the product is remarkably improved.
The invention adopts one-time pouring vibration molding, the zirconium plate and the steel shell of the mosaic body are fixed on a molding die, and the pouring material is added into the steel shell for vibration molding. Under the high-frequency vibration of the pug, mutual collision among pug particles is realized, static friction is changed into dynamic friction, and the pug has fluidity, so that the green brick has the advantages of high density and high strength. The integrity and the fastness of the zirconium plate, the steel shell and the body in the working area are increased, the integrity of the sliding plate brick in the using process is ensured, the anti-stripping performance is improved, and the excellent performances of corrosion resistance, scouring resistance, long service life and the like of the zirconium plate material can be fully exerted.
Compared with the composite sliding plate brick with the outer sleeve made of sintered aluminum zirconium carbon and the embedded layer made of zirconium material, the sliding plate brick has the advantages that on one hand, the fire clay between the body and the steel shell and between the body and the zirconium plate is removed, and the integrity of the product is improved; on the other hand, the production process is simple and easy to operate, high-temperature firing, embedding and box adding processes are not carried out, the production period is greatly shortened, the process is economical, environment-friendly and safe, and the use requirement of more than 20-25 furnaces can be met through research and development tests.
The sliding plate brick has excellent physical performance indexes, wherein the volume density is as follows: 3.20 to 3.32g/cm3(110℃×24h)、3.15～3.21g/cm3(1500 ℃ C. times.3 h), room-temperature compressive strength: 83-95 MPa (110 ℃ x 24h), 182-199 MPa (1500 ℃ x 3h), room-temperature flexural strength: 18.9 to 22.2MPa (110 ℃ C.. times.24 h), 42.3 to 48.5MPa (1500 ℃ C.. times.3 h), linear change rate: 0.22-0.32% (1500 ℃ C.. times.3 h).
Detailed Description
The following examples further illustrate the embodiments of the present invention in detail.
The particle size of the raw materials of the sliding plate brick of the invention is required as follows:
the plate-shaped corundum has the granularity range as follows: the granularity is more than 3mm and less than or equal to 5mm, the granularity is more than 1mm and less than or equal to 3mm, the granularity is more than 0.5mm and less than or equal to 1mm, the granularity is more than 0.044mm and less than or equal to 0.5mm, and the granularity is more than or equal to 5mm and less than or equal to 0.044 mm.
The main chemical components (weight content,%) of each raw material are as follows:
example 1
A sliding plate brick for blocking slag at a converter steel tapping hole is molded by casting, and comprises the following raw materials in percentage by weight: 65% of tabular corundum, 12% of magnesium-rich spinel, 7% of silicon carbide, 10% of alpha-alumina micro powder, 1% of pure calcium aluminate cement, 5% of rho-alumina micro powder and 0.05% of water reducing agent in total amount of the raw materials.
Wherein the plate-shaped corundum has the following weight ratios of different particle sizes: particle size 1: particle size 2: particle size 3: particle size 4: particle size 4-10: 25: 15: 10: 5; the particle size of the magnesium-rich spinel is less than or equal to 0.013 mm; the granularity of the pure calcium aluminate cement is less than or equal to 0.045 mm; the granularity of the silicon carbide is less than or equal to 1 mm; the granularity of the alpha-alumina micro powder is D50 ═ 0.25 mu m, and the model is CL 370; the specific surface area of the rho-alumina micro powder is 200m2Per gram, the granularity is less than or equal to 5 mu m; the water reducing agent is a high-efficiency organic water reducing agent FS10 and FW10 which are purchased from Pasteur Germany, wherein the dosage ratio of FS10 to FW10 is 1: 1.
The production method of the sliding plate brick comprises the following steps:
(1) the preparation process of the pug comprises the following steps:
weighing the raw materials and the water reducing agent according to the proportion, adding the raw materials into a stirrer, stirring for 1-2 min, adding the water reducing agent, continuing to stir for 3-5 min, uniformly mixing, adding water accounting for 4-6% of the total weight of the raw materials and the water reducing agent, and continuing to stir for 5-10 min to obtain pug;
(2) pouring, vibrating and molding:
fixing the zirconium plate and the steel shell of the mosaic body on a forming die, adding the prepared mud material into the steel shell, vibrating for 5-10 min, curing for 24h at room temperature after forming, demoulding to obtain a slide plate brick blank, and drying the blank for 36h at the temperature of 300 +/-10 ℃;
(1) and grinding and coating the dried slide plate brick blank to obtain the product of the invention.
Example 2
A sliding plate brick for blocking slag at a converter steel tapping hole is molded by casting, and comprises the following raw materials in percentage by weight: 70 percent of tabular corundum, 10 percent of magnesium-rich spinel, 5 percent of silicon carbide, 8 percent of alpha-alumina micro powder, 1 percent of pure calcium aluminate cement, 6 percent of rho-alumina micro powder and 0.05 percent of water reducing agent in the total amount of the raw materials.
Wherein the plate-shaped corundum has the following weight ratios of different particle sizes: particle size 1: particle size 2: particle size 3: particle size 4: particle size 5 ═ 15: 20: 15: 15: 5.
the production method of the slide brick is the same as that of example 1.
Example 3
A sliding plate brick for blocking slag at a converter steel tapping hole is molded by casting, and comprises the following raw materials in percentage by weight: 78 percent of tabular corundum, 8 percent of magnesium-rich spinel, 3 percent of silicon carbide, 6 percent of alpha-alumina micro powder, 2 percent of pure calcium aluminate cement, 3 percent of rho-alumina micro powder and 0.05 percent of water reducing agent in the total amount of the raw materials.
Wherein the plate-shaped corundum has the following weight ratios of different particle sizes: particle size 1: particle size 2: particle size 3: particle size 4: particle size 5-10: 25: 20: 13: 10.
the production method of the slide brick is the same as that of example 1.
Product Performance analysis of the invention
The performance of the slide tiles of the present invention (examples 1-3) was tested and the results are shown in Table 2 below.
Claims (8)
1. The sliding plate brick for the slag blocking of the converter steel tapping hole is characterized by comprising the following raw materials in percentage by weight: 65-78% of tabular corundum, 8-12% of magnesium-rich spinel, 3-7% of silicon carbide, 6-10% of alpha-alumina micro powder, 1-2% of pure calcium aluminate cement, 3-6% of rho-alumina micro powder and a water reducing agent accounting for 0.05-0.2% of the total amount of the raw materials.
2. The slide plate brick of claim 1 wherein said plate corundum includes particles and fines; wherein the particle size range is as follows: the granularity of 3mm < 1mm < 5mm, the granularity of 1mm < 2 mm < 3mm, the granularity of 0.5mm < 3mm < 1mm, the granularity of 0.044mm < 4mm < 0.5mm, and the granularity of 5 < 0.044 mm.
3. The slide plate brick according to claim 2, wherein the weight ratio of the different particle sizes is: particle size 1: particle size 2: particle size 3: particle size 4: the particle size is 5-10-15: 20-25: 15-20: 10-15: 5 to 10.
4. The slider brick of claim 1 wherein the magnesium rich spinel has a particle size of 0.013mm or less; the granularity of the pure calcium aluminate cement is less than or equal to 0.045 mm; the granularity of the silicon carbide is less than or equal to 1 mm.
5. The slide plate brick according to claim 1, wherein the particle size of the fine α -alumina powder is: d50 ═ 0.25 μm, model CL 370.
6. The slide brick of claim 1 wherein the fine rho-alumina powder has a specific surface area of 200m2The grain size is less than or equal to 5 mu m.
7. The slide brick as claimed in claim 1, wherein the water reducing agent is a high efficiency organic water reducing agent FS10 and FW10, wherein the dosage ratio of FS10 and FW10 is 1: 1.
8. A method of producing a slide plate brick as claimed in claim 1, characterized by the steps of:
(1) the preparation process of the pug comprises the following steps:
weighing the raw materials and the water reducing agent according to the proportion, adding the raw materials into a stirrer, stirring for 1-2 min, adding the water reducing agent, continuing to stir for 3-5 min, uniformly mixing, adding water accounting for 4-6% of the total weight of the raw materials and the water reducing agent, and continuing to stir for 5-10 min to obtain pug;
(2) pouring, vibrating and molding:
fixing the zirconium plate and the steel shell of the mosaic body on a forming die, adding the prepared mud material into the steel shell, vibrating for 5-10 min, curing for 24h at room temperature after forming, demoulding to obtain a slide plate brick blank, and drying the blank for 36h at the temperature of 300 +/-10 ℃;
(3) and grinding and coating the dried slide plate brick blank to obtain the product of the invention.
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| CN202010853939.8A CN112624743B (en) | 2020-08-24 | 2020-08-24 | Sliding plate brick for blocking slag at converter steel tapping hole formed by casting and production method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115504773A (en) * | 2022-10-21 | 2022-12-23 | 鞍山钢铁冶金炉材科技有限公司 | Vibration-formed tundish slag-suction filtering separator and preparation method thereof |
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