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A magnesia spinel-zirconia dispersed air brick formed in situ by combustion and its preparation process

A magnesia spinel and preparation process technology, applied in the field of high-temperature ceramics and refractory materials in the subject of inorganic non-metallic materials, can solve the problems of difficult adaptation, poor resistance to alkali corrosion of corundum breathable bricks, etc.

Active Publication Date: 2022-06-28
YIXING REFRACTORY MATERIAL +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the amphoteric oxide characteristics of alumina, corundum is easy to react with alkali at high temperature, resulting in poor alkali corrosion resistance of corundum permeable bricks, and it is difficult to adapt to calcium-treated steel, high-oxygen steel, high-quality steel, boiling steel, killed steel, semi Requirements for extra-furnace refining of special steels such as killed steel, the ladle breathable bricks for refining these special steel types have become the key factors restricting the life of the extra-furnace refining ladle

Method used

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  • A magnesia spinel-zirconia dispersed air brick formed in situ by combustion and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Raw material specifications and formula (weight percentage) are as follows:

[0036] (1) Fused magnesia with a particle size of 4 to 2 mm, 26%;

[0037] (2) Fused magnesia with a particle size of 2 to 1 mm, 45%;

[0038] (3) Zirconia with a particle size of 1 to 0.088mm, 11%;

[0039] (4) Magnesium-aluminum spinel with a particle size of 1 to 0.088mm, 2%;

[0040] (5) Activated alumina with a particle size of 1 to 0.088mm, 6%;

[0041] (6) Magnesium metal powder with a particle size of 1 to 0.088mm, 10%;

[0042] (7) Carbon dioxide gas;

[0043] (8) Additives, polymethyl methacrylate (PMMA) powder, +18%;

[0044] (9) Addition of binder, liquid tar, +3%;

[0045] The preparation technology includes the following steps:

[0046] (1) Mixing and grinding of ingredients: Weigh the fused magnesia with a particle size of 4-2mm and the fused magnesia with a particle size of 2-1mm in proportion to dry-mix for 2 minutes, then add liquid tar and mix for 3 minutes. Then add...

Embodiment 2

[0052] Raw material specifications and formula (weight percentage) are as follows:

[0053] (1) Fused magnesia with a particle size of 4 to 2 mm, 35%;

[0054] (2) Fused magnesia with a particle size of 2 to 1 mm, 42%;

[0055] (3) Zirconia with a particle size of 1 to 0.088mm, 8%;

[0056] (4) Magnesium-aluminum spinel with a particle size of 1 to 0.088mm, 4%;

[0057] (5) Activated alumina with a particle size of 1 to 0.088mm, 4%;

[0058] (6) Magnesium metal powder with a particle size of 1 to 0.088mm, 7%;

[0059] (7) Carbon dioxide gas;

[0060] (8) Additives, polymethyl methacrylate (PMMA) powder, +12%;

[0061] (9) Addition of binder, liquid tar, +2%;

[0062] The preparation technology includes the following steps:

[0063] (1) Mixing and grinding of ingredients: Weigh the fused magnesia with a particle size of 4-2mm and the fused magnesia with a particle size of 2-1mm in proportion to dry-mix for 3 minutes, then add liquid tar and mix for 2 minutes. Then add 1...

Embodiment 3

[0069] Raw material specifications and formula (weight percentage) are as follows:

[0070] (1) Fused magnesia with a particle size of 4 to 2 mm, 44%;

[0071] (2) Fused magnesia with a particle size of 2 to 1 mm, 38%;

[0072] (3) Zirconia with a particle size of 1 to 0.088mm, 5%;

[0073] (4) Magnesium-aluminum spinel with a particle size of 1 to 0.088mm, 5%;

[0074] (5) Activated alumina with a particle size of 1 to 0.088mm, 3%;

[0075] (6) Magnesium metal powder with a particle size of 1 to 0.088mm, 5%;

[0076] (7) Carbon dioxide gas;

[0077] (8) Additives, polymethyl methacrylate (PMMA) powder, +6%;

[0078] (9) Addition of binder, liquid tar, +2%;

[0079] The preparation technology includes the following steps:

[0080] (1) Mixing and grinding of ingredients: Weigh the fused magnesia with a particle size of 4-2 mm and the fused magnesia with a particle size of 2-1 mm in proportion to dry-mix for 2 minutes, then add liquid tar and mix for 2 minutes. Then add ...

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Abstract

The invention relates to a magnesia spinel-zirconia dispersed air brick formed in situ by combustion and a preparation process thereof. Using periclase, spinel, zirconia as main raw materials, adding metal Mg powder and active Al 2 o 3 , using Mg in CO 2 The medium powder is burned to generate MgO and carbon, and at the same time, a high temperature of more than 2000°C is generated locally, and the generated MgO has high reactivity, and active Al 2 o 3 In-situ reaction forms spinel to promote sintering, so that the permeable brick can obtain high strength and wear resistance. At the same time, the high temperature of combustion makes MgO partially dissolve in ZrO 2 , improve the corrosion resistance and thermal shock resistance of the permeable brick; the carbon is burned out in the subsequent oxidation, and the dispersed channels are left to give good ventilation.

Description

technical field [0001] The invention relates to a combustion-synthesized magnesium spinel-zirconia dispersion type breathable brick and a preparation process thereof, and belongs to the field of high-temperature ceramics and refractory materials in the subject of inorganic non-metallic materials. [0002] technical background [0003] Out-of-furnace refining is an indispensable smelting process for the preparation of special steel and high-grade steel. In refining, the gas-permeable bricks at the bottom of the ladle are used for argon-blowing stirring to homogenize the composition of molten steel, homogenize the temperature of molten steel, and promote inclusions, slag, The gas floats to remove non-metallic inclusions, promotes the metallurgical reaction of the alloy, cleans the molten steel, improves the quality of the molten steel, and achieves the purpose of refining. The breathable brick must have excellent air permeability, and at the same time, it must have excellent co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B35/66C04B35/443C04B35/622
CPCC04B38/0025C04B35/66C04B35/443C04B35/622C04B2235/3206C04B2235/3244C04B2235/401C04B2235/77C04B2235/96C04B2235/3222C04B2235/3217
Inventor 陈松林李江涛袁彪杨增朝贺刚刘士范宋云阶钱能蒋正跃
Owner YIXING REFRACTORY MATERIAL