CN108101561B - Steel ladle castable for stainless steel smelting and preparation method thereof - Google Patents
Steel ladle castable for stainless steel smelting and preparation method thereof Download PDFInfo
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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
- C04B35/106—Refractories from grain sized mixtures containing zirconium oxide or zircon (ZrSiO4)
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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
- C04B35/103—Refractories from grain sized mixtures containing non-oxide refractory materials, e.g. carbon
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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
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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
- C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts
- C04B2235/9676—Resistance against chemicals, e.g. against molten glass or molten salts against molten metals such as steel or aluminium
Abstract
The invention relates to a ladle castable for stainless steel smelting and a preparation method thereof. The scheme is as follows: 43-68 wt% of microporous corundum particles and 10-27 wt% of magnesia-alumina spinel particles are used as aggregate, and 5-15 wt% of microporous corundum fine powder, 2-4 wt% of magnesia-alumina spinel micro powder, 4-8 wt% of pseudo-boehmite and 2-4 wt% of rho-Al2O3Fine powder, 0.1-1 wt% of monoclinic phase zirconia fine powder and 0.1-1 wt% of chromium powder are taken as substrates, and the sum of the aggregate and the substrates is taken as raw materials; the additive is prepared from 0.04-0.08 wt% of organic fibers, 0.1-0.5 wt% of polycarboxylic acid water reducing agent, 0.2-0.5 wt% of maleic acid and 0.01-0.03 wt% of defoaming agent. Stirring the matrix, the additive and water to obtain a premix; and (3) scattering the aggregate into the mold, pouring the premix into the mold, forming, drying and demolding to prepare the ladle castable for stainless steel smelting. The invention has high strength, good thermal shock stability, excellent erosion resistance and steel slag erosion resistance and can improve the quality of stainless steel.
Description
Technical Field
The invention belongs to the technical field of ladle castable. In particular to a ladle castable for stainless steel smelting and a preparation method thereof.
Background
Stainless steel refers to steel which resists corrosion by weak corrosive media such as air, steam, water and the like and chemical corrosive media such as acid, alkali, salt and the like, and is also called as stainless acid-resistant steel. The chemical components of the stainless steel are mainly added with alloy elements such as chromium (Cr), nickel (Ni), manganese (Mn) and the like so as to improve the physical and chemical properties such as corrosion resistance, oxidation resistance, wear resistance and the like of the steel. The corrosion resistance of stainless steel is affected by the content of Cr, and it is generally considered that alloy steel has corrosion resistance when the content of Cr is not less than 11.7%, and the chromium content of stainless steel in industry is generally required to be 12-30%.
The refractory material plays an important role in the steel smelting process, and different smelting stages have different requirements on the refractory material, for example, the furnace body mainly adopts magnesia carbon bricks in the EAF smelting process, and the furnace cover mainly adopts chromium-containing corundum castable. AOD, VOD smelting process mainly adopts burnt magnesia-calcium brick, burnt dolomite brick and magnesia-calcium-zirconium brick, also directly uses unburned magnesia dolomite brick, these refractory materials directly contact with molten steel in the steel smelting process, the free impurity elements existing in the molten steel can react with the refractory materials, produce inclusion in the steel, for example, magnesia carbon refractory materials can increase spinel inclusion and carbon content in aluminum killed steel.
The magnesium-calcium refractory material is mainly used for the stainless steel smelting ladle, and plays an active role in dephosphorization and desulfurization in the ladle smelting process, so that the phosphorus and sulfur contents in the stainless steel water can be reduced, but [ Ca ] in the magnesium-calcium refractory material is easy to react with free [ S ] in the molten steel to generate CaS with a high melting point, so that inclusions in steel are formed, and the cleanliness of the molten steel is influenced. In addition, the refractory material is easy to peel off and damage under the erosion action of the molten steel, the service life of the refractory material is shortened, and the cleanliness of the molten steel is influenced. The prior ladle refractory material has the disadvantages of rapid corrosion loss in the stainless steel smelting process and unfavorable control of elements in steel, and restricts the production of stainless steel.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a ladle castable for stainless steel smelting, which has high strength, good thermal shock stability, excellent scouring resistance and steel slag erosion resistance and can improve the quality of stainless steel, and a preparation method thereof.
In order to realize the purpose, the invention adopts the technical scheme that: using 43-68 wt% of microporous corundum particles and 10-27 wt% of magnesium aluminate spinel particles as aggregates, and using 5-15 wt% of microporous corundum fine powder, 2-4 wt% of magnesium aluminate spinel micro powder, 4-8 wt% of pseudo-boehmite, and 2-4 wt% of rho-Al2O3Fine powder, 0.1-1 wt% of monoclinic phase zirconia fine powder and 0.1-1 wt% of chromium powder are used as matrixes, and the sum of the aggregates and the matrixes is used as a raw material; organic fiber accounting for 0.04-0.08 wt% of the raw material and organic fiber accounting for 0.1-0.5 wt% of the raw materialA polycarboxylic acid water reducing agent, 0.2-0.5 wt% of maleic acid and 0.01-0.03 wt% of a defoaming agent are used as additives.
Premixing the substrate and the additive, adding water accounting for 4-10 wt% of the raw materials, and stirring for 2-4 minutes to obtain the premix. And (3) installing a mould, uniformly scattering the aggregate into the mould, pouring the premix into the mould, carrying out vibration forming, carrying out heat preservation for 12-48 hours at the temperature of 110-200 ℃, and demoulding to obtain the ladle castable for stainless steel smelting.
Al of the microporous corundum particles2O3The content is more than or equal to 99.5 wt%; the microporous corundum particles are as follows: the apparent porosity is less than or equal to 5.22 percent, the closed porosity is more than or equal to 7.5 percent, the median pore diameter is less than or equal to 0.2 mu m, and the particle diameter of the microporous corundum particles is 20-0.088 mm.
Al of the magnesium aluminate spinel particles2O3The content is 70-75 wt%; the particle size of the magnesia-alumina spinel particles is 8-1 mm.
ZrO of the monoclinic phase zirconia fine powder2Content (wt.)>95 wt%; the particle size of the monoclinic phase zirconia fine powder is<0.088mm。
Al of the microporous corundum fine powder2O3The content is more than or equal to 99.5 wt%; the microporous corundum fine powder: the apparent porosity is less than or equal to 5.22 percent, the closed porosity is more than or equal to 7.5 percent, the median pore diameter is less than or equal to 0.2 mu m, and the grain diameter of the microporous corundum fine powder<0.088mm。
Al of the magnesia-alumina spinel micropowder2O3Content (wt.)>88 wt%; particle size D of magnesia-alumina spinel micropowder502 to 6 μm.
Peptization index of the pseudoboehmite>97 wt%; particle size D of pseudo-boehmite500.2 to 5 μm.
The rho-Al2O3Fine powder of Al2O3The content is more than or equal to 80 wt%; the rho-Al2O3Particle diameter D of fine powder501 to 5 μm.
The content of Cr in the chromium powder is more than 99.9 wt%, and the particle size of the chromium powder is 0.048-0.18 mm.
The defoaming agent is one of silicone ether co-cluster, organic siloxane, polyether, silicone oil composite, amine-containing, imine and amide.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following positive effects:
(1) rho-Al used in the invention2O3Reacting with water to generate heat to make the pseudo-boehmite in H+Can be quickly converted into alumina sol in the presence of the acid, and balances and inhibits rho-Al2O3The nano alumina is formed after the rapid reaction with water and dehydration in the baking and service processes, so that the ladle castable for stainless steel smelting has good construction performance and medium-high temperature strength.
(2) The chromium powder adopted by the invention can improve the toughness of the material, the Cr is oxidized to form chromium oxide, the chromium oxide reacts with the alumina to generate an aluminum-chromium solid solution, the high-temperature volume stability of the ladle castable for stainless steel smelting is improved, and the in-situ stress is provided to enhance the superplasticity of the nano alumina.
(3) The monoclinic phase zirconia adopted by the invention generates phase change to generate in-situ stress when the temperature is raised, the superplasticity of the nano alumina promotes the formation of a micro-closed pore matrix, and the phase change of the zirconia can offset the shrinkage of the stainless steel smelting ladle castable when the temperature is lowered, so that the monoclinic phase zirconia is matched with the prefabricated microporous corundum, and the thermal shock resistance and the steel slag corrosion resistance of the stainless steel smelting ladle castable are comprehensively improved.
(4) According to the invention, by adding the chromium powder, the reaction of Cr in the stainless steel and the ladle castable for stainless steel smelting can be inhibited, the Cr content in the stainless steel is increased, and the quality of the stainless steel is improved.
The detection shows that the ladle castable for stainless steel smelting prepared by the invention is prepared by the following steps: the bulk density is 2.95-3.20 g/cm3(ii) a The apparent porosity is 12.1-13.9%; the normal-temperature rupture strength (110 ℃ for 24h) is 5-8 MPa, and the normal-temperature rupture strength (1600 ℃ for 3h) is 15-25 MPa; the high-temperature rupture strength is 15-20 MPa; the normal temperature compressive strength (110 ℃ for 24h) is 40-60 MPa, and the normal temperature compressive strength (1600 ℃ for 3h) is 70-90 MPa; the linear change rate (1600 ℃ for 3h) is 0.5-2.0%; under the water cooling condition of 1100 ℃, the thermal shock frequency is more than or equal to 13 times.
Therefore, the invention has the characteristics of high strength, good thermal shock stability, excellent scouring resistance and steel slag erosion resistance and capability of improving the quality of stainless steel.
Detailed Description
The invention is further described with reference to specific embodiments, without limiting the scope of protection.
In order to avoid repetition, the raw materials and the additives related to the present specific embodiment are described below in a unified manner, and are not described in detail in the examples:
al of the microporous corundum particles2O3The content is more than or equal to 99.5 wt%; the microporous corundum particles are as follows: the apparent porosity is less than or equal to 5.22 percent, the closed porosity is more than or equal to 7.5 percent, the median pore diameter is less than or equal to 0.2 mu m, and the particle diameter of the microporous corundum particles is 20-0.088 mm.
Al of the magnesium aluminate spinel particles2O3The content is 70-75 wt%; the particle size of the magnesia-alumina spinel particles is 8-1 mm.
ZrO of the monoclinic phase zirconia fine powder2Content (wt.)>95 wt%; the particle size of the monoclinic phase zirconia fine powder is<0.088mm。
Al of the microporous corundum fine powder2O3The content is more than or equal to 99.5 wt%; the microporous corundum fine powder: the apparent porosity is less than or equal to 5.22 percent, the closed porosity is more than or equal to 7.5 percent, the median pore diameter is less than or equal to 0.2 mu m, and the grain diameter of the microporous corundum fine powder<0.088mm。
Al of the magnesia-alumina spinel micropowder2O3Content (wt.)>88 wt%; particle size D of magnesia-alumina spinel micropowder502 to 6 μm.
Peptization index of the pseudoboehmite>97 wt%; particle size D of pseudo-boehmite500.2 to 5 μm.
The rho-Al2O3Fine powder of Al2O3The content is more than or equal to 80 wt%; the rho-Al2O3Particle diameter D of fine powder501 to 5 μm.
The content of Cr in the chromium powder is more than 99.9 wt%, and the particle size of the chromium powder is 0.048-0.18 mm.
Example 1
A ladle castable for stainless steel smelting and a preparation method thereof.
Using 43-53 wt% of microporous corundum particles and 19-27 wt% of magnesia-alumina spinel particles as aggregates, and using 11-15 wt% of microporous corundum fine powder, 2-4 wt% of magnesia-alumina spinel fine powder, 4-5 wt% of pseudo-boehmite, and 2-4 wt% of rho-Al2O3Fine powder, 0.1-1 wt% of monoclinic phase zirconia fine powder and 0.1-1 wt% of chromium powder are used as matrixes, and the sum of the aggregates and the matrixes is used as a raw material; organic fiber accounting for 0.04-0.08 wt% of the raw material, a polycarboxylic acid water reducing agent accounting for 0.1-0.5 wt%, maleic acid accounting for 0.2-0.5 wt% and a defoaming agent accounting for 0.01-0.03 wt% are taken as additives.
Premixing the substrate and the additive, adding water accounting for 4-7 wt% of the raw materials, and stirring for 2-4 minutes to obtain the premix. And (3) installing a mould, uniformly scattering the aggregate into the mould, pouring the premix into the mould, carrying out vibration forming, carrying out heat preservation for 36-48 hours at the temperature of 110-170 ℃, and demoulding to obtain the ladle castable for stainless steel smelting.
The defoaming agent is silicon ether co-cluster.
Example 2
A ladle castable for stainless steel smelting and a preparation method thereof.
By taking 48-58 wt% of microporous corundum particles and 16-24 wt% of magnesia-alumina spinel particles as aggregates, 9-13 wt% of microporous corundum fine powder, 2-4 wt% of magnesia-alumina spinel micro powder, 5-6 wt% of pseudo-boehmite and 2-4 wt% of rho-Al2O3Fine powder, 0.1-1 wt% of monoclinic phase zirconia fine powder and 0.1-1 wt% of chromium powder are used as matrixes, and the sum of the aggregates and the matrixes is used as a raw material; organic fiber accounting for 0.04-0.08 wt% of the raw material, a polycarboxylic acid water reducing agent accounting for 0.1-0.5 wt%, maleic acid accounting for 0.2-0.5 wt% and a defoaming agent accounting for 0.01-0.03 wt% are taken as additives.
Premixing the substrate and the additive, adding water accounting for 5-8 wt% of the raw materials, and stirring for 2-4 minutes to obtain the premix. And (3) installing a mould, uniformly scattering the aggregate into the mould, pouring the premix into the mould, carrying out vibration forming, carrying out heat preservation for 28-40 hours at the temperature of 120-180 ℃, and demoulding to obtain the steel ladle castable for stainless steel smelting.
The defoaming agent is organic siloxane.
Example 3
A ladle castable for stainless steel smelting and a preparation method thereof.
53-63 wt% of microporous corundum particles and 13-21 wt% of magnesia-alumina spinel particles are used as aggregates, 7-11 wt% of microporous corundum fine powder, 2-4 wt% of magnesia-alumina spinel micro powder, 6-7 wt% of pseudo-boehmite, and 2-4 wt% of rho-Al2O3Fine powder, 0.1-1 wt% of monoclinic phase zirconia fine powder and 0.1-1 wt% of chromium powder are used as matrixes, and the sum of the aggregates and the matrixes is used as a raw material; organic fiber accounting for 0.04-0.08 wt% of the raw material, a polycarboxylic acid water reducing agent accounting for 0.1-0.5 wt%, maleic acid accounting for 0.2-0.5 wt% and a defoaming agent accounting for 0.01-0.03 wt% are taken as additives.
Premixing the substrate and the additive, adding 6-9 wt% of water of the raw materials, and stirring for 2-4 minutes to obtain the premix. And (3) installing a mould, uniformly scattering the aggregate into the mould, pouring the premix into the mould, carrying out vibration forming, carrying out heat preservation for 20-32 hours at the temperature of 130-190 ℃, and demoulding to obtain the ladle castable for stainless steel smelting.
The defoaming agent is an amide.
Example 4
A ladle castable for stainless steel smelting and a preparation method thereof.
58-68 wt% of microporous corundum particles and 10-18 wt% of magnesia-alumina spinel particles are used as aggregate, 5-9 wt% of microporous corundum fine powder, 2-4 wt% of magnesia-alumina spinel micro powder, 7-8 wt% of pseudo-boehmite, and 2-4 wt% of rho-Al2O3Fine powder, 0.1-1 wt% of monoclinic phase zirconia fine powder and 0.1-1 wt% of chromium powder are used as matrixes, and the sum of the aggregates and the matrixes is used as a raw material; organic fiber accounting for 0.04-0.08 wt% of the raw material, a polycarboxylic acid water reducing agent accounting for 0.1-0.5 wt%, maleic acid accounting for 0.2-0.5 wt% and a defoaming agent accounting for 0.01-0.03 wt% are taken as additives.
Premixing the substrate and the additive, adding water accounting for 7-10 wt% of the raw materials, and stirring for 2-4 minutes to obtain the premix. And (3) installing a mould, uniformly scattering the aggregate into the mould, pouring the premix into the mould, carrying out vibration forming, carrying out heat preservation for 12-24 hours at the temperature of 140-200 ℃, and demoulding to obtain the ladle castable for stainless steel smelting.
The defoaming agent is one of polyether, silicone oil composite, amine-containing and imine.
Compared with the prior art, the specific implementation mode has the following positive effects:
(1) rho-Al used in the present embodiment2O3Reacting with water to generate heat to make the pseudo-boehmite in H+Can be quickly converted into alumina sol in the presence of the acid, and balances and inhibits rho-Al2O3The nano alumina is formed after the rapid reaction with water and dehydration in the baking and service processes, so that the ladle castable for stainless steel smelting has good construction performance and medium-high temperature strength.
(2) The adopted chromium powder can improve the toughness of the material, the Cr is oxidized to form chromium oxide, the chromium oxide reacts with the aluminum oxide to generate an aluminum-chromium solid solution, the high-temperature volume stability of the ladle castable for stainless steel smelting is improved, and the in-situ stress is provided to enhance the superplasticity of the nano aluminum oxide.
(3) The monoclinic phase zirconia adopted by the embodiment generates phase change to generate in-situ stress when the temperature is raised, the superplasticity of the nano alumina promotes the formation of a micro-closed pore matrix, and the phase change energy of the zirconia can offset the shrinkage of the stainless steel smelting ladle castable material when the temperature is lowered, so that the monoclinic phase zirconia is matched with the prefabricated micro-porous corundum, and the thermal shock resistance and the steel slag corrosion resistance of the stainless steel smelting ladle castable material are comprehensively improved.
(4) According to the specific embodiment, the chromium powder is added, so that the reaction of Cr in the stainless steel and the steel ladle castable for stainless steel smelting can be inhibited, the content of Cr in the stainless steel is increased, and the quality of the stainless steel is improved.
The detection of the ladle castable for stainless steel smelting prepared by the specific embodiment is as follows: the bulk density is 2.95-3.20 g/cm3(ii) a The apparent porosity is 12.1-13.9%;the normal-temperature rupture strength (110 ℃ for 24h) is 5-8 MPa, and the normal-temperature rupture strength (1600 ℃ for 3h) is 15-25 MPa; the high-temperature rupture strength is 15-20 MPa; the normal temperature compressive strength (110 ℃ for 24h) is 40-60 MPa, and the normal temperature compressive strength (1600 ℃ for 3h) is 70-90 MPa; the linear change rate (1600 ℃ for 3h) is 0.5-2.0%; under the water cooling condition of 1100 ℃, the thermal shock frequency is more than or equal to 13 times.
Therefore, the specific embodiment has the characteristics of high strength, good thermal shock stability, excellent scouring resistance and steel slag corrosion resistance and capability of improving the quality of stainless steel.
Claims (7)
1. The preparation method of the ladle castable for stainless steel smelting is characterized by taking 43-68 wt% of microporous corundum particles and 10-27 wt% of magnesium aluminate spinel particles as aggregates, 5-15 wt% of microporous corundum fine powder, 2-4 wt% of magnesium aluminate spinel fine powder, 4-8 wt% of pseudo-boehmite and 2-4 wt% of rho-Al2O3Fine powder, 0.1-1 wt% of monoclinic phase zirconia fine powder and 0.1-1 wt% of chromium powder are used as matrixes, and the sum of the aggregates and the matrixes is used as a raw material; taking organic fibers accounting for 0.04-0.08 wt% of the raw materials, a polycarboxylic acid water reducing agent accounting for 0.1-0.5 wt%, maleic acid accounting for 0.2-0.5 wt% and a defoaming agent accounting for 0.01-0.03 wt% as additives; premixing the substrate and the additive, adding water accounting for 4-10 wt% of the raw materials, and stirring for 2-4 minutes to obtain a premix; installing a mould, uniformly scattering the aggregate into the mould, pouring the premix into the mould, carrying out vibration molding, carrying out heat preservation for 12-48 hours at the temperature of 110-200 ℃, and demoulding to obtain the steel ladle castable for stainless steel smelting;
ZrO of the monoclinic phase zirconia fine powder2Content (wt.)>95 wt% of monoclinic phase zirconia fine powder having a particle size of<0.088mm；
Peptization index of the pseudoboehmite>97 wt%, particle size D of pseudo-boehmite500.2 to 5 μm;
the rho-Al2O3Fine powder of Al2O3Content is more than or equal to 80 wt%, rho-Al2O3Particle diameter D of fine powder501 to 5 μm;
the content of Cr in the chromium powder is more than 99.9 wt%, and the particle size of the chromium powder is 0.048-0.18 mm.
2. The method for preparing ladle castable for stainless steel smelting according to claim 1, characterized in that Al of the microporous corundum particles2O3The content is more than or equal to 99.5 wt%; the microporous corundum particles are as follows: the apparent porosity is less than or equal to 5.22 percent, the closed porosity is more than or equal to 7.5 percent, the median pore diameter is less than or equal to 0.2 mu m, and the particle diameter of the microporous corundum particles is 20-0.088 mm.
3. The method for preparing ladle castable for stainless steel smelting according to claim 1, characterized in that Al of magnesium aluminate spinel particles2O3The content is 70-75 wt%; the particle size of the magnesia-alumina spinel particles is 8-1 mm.
4. The method for preparing ladle castable for stainless steel smelting according to claim l, characterized in that Al of said microporous corundum fine powder2O3The content is more than or equal to 99.5 wt%; the microporous corundum fine powder: the apparent porosity is less than or equal to 5.22 percent, the closed porosity is more than or equal to 7.5 percent, the median pore diameter is less than or equal to 0.2 mu m, and the grain diameter of the microporous corundum fine powder<0.088mm。
5. The method for preparing the ladle castable for stainless steel smelting according to claim l, characterized in that the magnesia-alumina spinel micro powder of Al2O3Content (wt.)>88 wt%; particle size D of magnesia-alumina spinel micropowder502 to 6 μm.
6. The method for preparing the ladle castable for stainless steel smelting according to claim 1, characterized in that the defoaming agent is one of siloxane co-cluster, organosiloxane, polyether, silicone oil complex, amine-containing, imine and amide.
7. A ladle castable for stainless steel smelting, characterized in that the ladle castable for stainless steel smelting is prepared according to the preparation method of the ladle castable for stainless steel smelting in any one of claims 1-6.
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| CN108558377B (en) * | 2018-06-25 | 2020-12-18 | 武汉科技大学 | Steel ladle castable for high-nitrogen steel smelting and preparation method thereof |
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| CN112500139B (en) * | 2021-02-05 | 2021-05-18 | 北京利尔高温材料股份有限公司 | High-strength anti-erosion ladle self-flow castable and preparation method thereof |
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