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Anti-longitudinal-cracking electric furnace steel ladle wall magnesia carbon brick and preparation process thereof

A wall magnesia carbon brick and its preparation technology are applied in the field of refractory materials for steelmaking, which can solve the problems of large thermal expansion coefficient of fused magnesia, affecting the service life of the ladle, longitudinal cracking of the cladding wall, etc., to improve the corrosion resistance, Effect of reducing erosion and penetration, reducing thermal or mechanical stress concentrations

Inactive Publication Date: 2021-02-12
WUGANG REFRACTORY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used electric furnace magnesia carbon bricks mainly use fused magnesia and graphite as raw materials. Due to the large thermal expansion coefficient of fused magnesia, cracks are prone to appear during use. Severe longitudinal cracks are formed in the part, which affects the service life of the ladle

Method used

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  • Anti-longitudinal-cracking electric furnace steel ladle wall magnesia carbon brick and preparation process thereof
  • Anti-longitudinal-cracking electric furnace steel ladle wall magnesia carbon brick and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation process of an anti-longitudinal-cracking electric furnace ladle-walled magnesia-carbon brick, comprising the steps of:

[0031] 1) Accurately weigh each component in proportion;

[0032] By weight percentage, 20% high-purity sintered magnesia, 65% fused magnesia, 10% flake graphite, 0.5% resin powder, 0.5% nano metal silicon powder, 4% thermosetting phenolic resin;

[0033] Among them, the chemical composition and mass percentage of high-purity sintered magnesia are MgO≥98.0%, SiO 2 ≤1%, CaO≤1%; and the high-purity sintered magnesia includes two gradations of 5-3mm and 3-1mm according to the particle size, and the weight percentages are 45% and 55% respectively;

[0034] The chemical composition and mass percentage of fused magnesia are MgO≥97.0%, SiO 2 ≤1.5%, CaO≤1.5%, and the fused magnesia includes four gradations of 5-3mm, 3-1mm, 1-0.088mm and ≤0.088mm according to the particle size, and the weight percentages are 20%, 25%, 40% and 15%;

[0035] Fl...

Embodiment 2

[0043] A preparation process for anti-longitudinal-cracking electric furnace ladle-walled magnesia-carbon bricks, comprising the steps of:

[0044] 1) Accurately weigh each component in proportion;

[0045] By weight percentage, 25% of high-purity sintered magnesia, 58% of fused magnesia, 12% of flake graphite, 1% of resin powder, 1% of nano-metal silicon powder, and 3% of thermosetting phenolic resin;

[0046] Among them, the chemical composition and mass percentage of high-purity sintered magnesia are MgO≥98.0%, SiO 2≤1%, CaO≤1%; and the high-purity sintered magnesia includes two gradations of 5-3mm and 3-1mm according to the particle size, and the weight percentages are 47% and 53% respectively;

[0047] The chemical composition and mass percentage of fused magnesia are MgO≥97.0%, SiO 2 ≤1.5%, CaO≤1.5%, and the fused magnesia includes four grades of 5-3mm, 3-1mm, 1-0.088mm and ≤0.088mm according to the particle size, and the weight percentages are 23%, 27%, 37% and 13%; ...

Embodiment 3

[0056] A preparation process of an anti-longitudinal-cracking electric furnace ladle-walled magnesia-carbon brick, comprising the steps of:

[0057] 1) Accurately weigh each component in proportion;

[0058] By weight percentage, 30% high-purity sintered magnesia, 53% fused magnesia, 11% flake graphite, 1% resin powder, 1.5% nano-metal silicon powder, 3.5% thermosetting phenolic resin;

[0059] Among them, the chemical composition and mass percentage of high-purity sintered magnesia are MgO≥98.0%, SiO 2 ≤1%, CaO≤1%; and the high-purity sintered magnesia includes two gradations of 5-3mm and 3-1mm according to the particle size, and the weight percentages are 45% and 55% respectively;

[0060] The chemical composition and mass percentage of fused magnesia are MgO≥97.0%, SiO 2 ≤1.5%, CaO≤1.5%, and the fused magnesia includes four gradations of 5-3mm, 3-1mm, 1-0.088mm and ≤0.088mm according to the particle size, and the weight percentages are respectively 26%, 29%, 35% and 10%;...

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Abstract

The invention relates to the field of refractory materials for steelmaking, in particular to an anti-longitudinal-cracking electric furnace steel ladle wall magnesia carbon brick and a preparation process thereof. The preparation process of an anti-longitudinal-cracking electric furnace steel ladle wall magnesia carbon brick comprises the following steps: 1) accurately weighing the following components in percentage by weight: 20-35% of high-purity sintered magnesia, 45-65% of fused magnesia, 10-14% of crystalline flake graphite, 0.5-1.5% of resin powder, 0.5-1.5% of antioxidant and 3-4% of binding agent; 2) stirring and mixing; 3) molding by a mold; 4) drying. According to the electric furnace steel ladle wall magnesia carbon brick capable of preventing longitudinal cracking obtained through the preparation process, the thermal expansion coefficient of the magnesia carbon brick is reduced, the thermal shock stability and the oxidation resistance of the material are improved, and thenlongitudinal cracking can be prevented.

Description

technical field [0001] The invention relates to the field of refractory materials for steelmaking, in particular to a longitudinal crack-resistant electric furnace ladle-walled magnesia-carbon brick and a preparation process thereof. Background technique [0002] Due to the production process and use requirements of the electric furnace ladle, most of the working lining bricks use carbon-containing materials. For the electric furnace ladle producing stainless steel, magnesia-carbon bricks are generally used as the working lining to reduce the inclusion of aluminum elements. The currently used electric furnace magnesia carbon bricks mainly use fused magnesia and graphite as raw materials. Due to the large thermal expansion coefficient of fused magnesia, cracks are prone to appear during use. Severe longitudinal cracks are formed in the part, which affects the service life of the ladle. Contents of the invention [0003] In order to solve the above problems, the purpose of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/043C04B35/634B28B3/02B22D41/02
CPCC04B35/043B22D41/02B28B3/02C04B35/63476C04B2235/425C04B2235/428C04B2235/77
Inventor 蔡长秀雷中兴周辉徐志华
Owner WUGANG REFRACTORY CO LTD