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Magnesia-carbon brick for electric arc furnace lining and manufacturing method thereof

A magnesia-carbon brick and electric arc furnace technology, applied in the field of refractory materials, can solve the problems of steel slag erosion, increased consumption of steel per ton of refractory materials, oxidation damage of MgO-C bricks, etc., and achieves long service life, low melting loss rate, and reduced ton The effect of steel consumption

Active Publication Date: 2016-06-29
SHANGHAI LIER REFRACTORY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a large number of furnace wall guns are used to blow oxygen instead of electrodes to heat steelmaking, the traditional MgO-C bricks are oxidized and damaged, and the steel slag is severely corroded and scoured, which seriously restricts the overall service life of the electric arc furnace and increases the consumption of refractory materials per ton of steel.

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  • Magnesia-carbon brick for electric arc furnace lining and manufacturing method thereof
  • Magnesia-carbon brick for electric arc furnace lining and manufacturing method thereof

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preparation example Construction

[0023] A preparation method of magnesia-carbon bricks for electric arc furnace lining, comprising the following steps:

[0024] a. Take fused magnesia, flake graphite, high-temperature pitch powder, anhydrous magnesium sulfate powder, metal silicon, metal aluminum and thermosetting phenolic resin, and set aside;

[0025] b. Grind the fused magnesia sand finely, and classify it into granular raw materials with five different particle sizes of 5-3mm, 3-1mm, 1-0mm and 200 mesh, and set aside;

[0026] Grinding metallic silicon and metallic aluminum into fine powders with a particle size of ≤200 mesh to obtain metallic silicon powder and metallic aluminum powder for subsequent use;

[0027] c. Take 70-80% of fused magnesia, 6-20% of flake graphite, 1-8% of metal silicon powder, 0.08-4% of metal aluminum powder, 1-10% of additives and 2-8% of thermosetting phenolic resin according to weight percentage. %;

[0028] The fused magnesia is composed of fused magnesia with different pa...

Embodiment 1

[0033] A preparation method of magnesia-carbon bricks for electric arc furnace lining, comprising the following steps:

[0034] a. Take fused magnesia, flake graphite, high-temperature pitch powder, anhydrous magnesium sulfate powder, metal silicon, metal aluminum and thermosetting phenolic resin, and set aside;

[0035] b. Grind the fused magnesia sand finely, and classify it into granular raw materials with five different particle sizes of 5-3mm, 3-1mm, 1-0mm and 200 mesh, and set aside;

[0036] Grinding metallic silicon and metallic aluminum into fine powders with a particle size of ≤200 mesh to obtain metallic silicon powder and metallic aluminum powder for subsequent use;

[0037] c. Take 70% of fused magnesia, 20% of flake graphite, 8% of metal silicon powder, 4% of metal aluminum powder, 10% of additives and 8% of thermosetting phenolic resin by weight percentage;

[0038] The fused magnesia is composed of fused magnesia with different particle sizes in the following ...

Embodiment 2

[0043] A preparation method of magnesia-carbon bricks for electric arc furnace lining, comprising the following steps:

[0044] a. Take fused magnesia, flake graphite, high-temperature pitch powder, anhydrous magnesium sulfate powder, metal silicon, metal aluminum and thermosetting phenolic resin, and set aside;

[0045] b. Grind the fused magnesia sand finely, and grade it into granular raw materials with five different particle sizes of 5-3mm, 3-1mm, 1-0mm and 200 mesh, and set aside;

[0046] Grinding metallic silicon and metallic aluminum into fine powders with a particle size of ≤200 mesh to obtain metallic silicon powder and metallic aluminum powder for subsequent use;

[0047] c. Take 80% of fused magnesia, 6% of flake graphite, 1% of metal silicon powder, 0.08% of metal aluminum powder, 8.92% of additives and 4% of thermosetting phenolic resin by weight percentage;

[0048] The fused magnesia is composed of fused magnesia with different particle sizes in the following...

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Abstract

The invention relates to a magnesia carbon brick for an arc furnace lining and a production method of the magnesia carbon brick. The magnesia carbon brick is prepared by raw materials in percentage by weight as follows: 70%-80% of fused magnesia, 6%-20% of flake graphite, 1%-8% of silicon metal powder, 0.08%-4% of aluminum metal powder, 1%-10% of additives and 2%-8% of phenolic resin. The magnesia carbon brick has the advantages that the problems of poor oxidation resistance, scouring resistance and poor erosion resistibility of the conventional magnesia carbon brick are solved, high-activity MgO is generated through high-temperature decomposition of anhydrous magnesium sulfate, and the high-temperature service performance of the material is enhanced. A refractory lining of an arc furnace built by the magnesia carbon bricks has lower melting loss rate, the consumption of per ton steel of a refractory material for the arc furnace can be reduced obviously, and the service life of the arc furnace is longer.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a magnesia-carbon brick for lining an electric arc furnace and a preparation method thereof. Background technique [0002] At present, my country's small electric arc furnace steelmaking still occupies a considerable proportion, and it uses low-cost and lower-grade refractory materials, such as pitch magnesia bricks and low-grade magnesia-carbon bricks. The service life is between 40~120 furnaces. Since the 1990s, ultra-high-power electric furnaces have developed rapidly, and the service life of electric arc furnaces has become higher and higher, and higher requirements have been put forward for the use of traditional MgO-C bricks. With the development of industrialization, the amount of scrap iron and steel in the world has increased, especially in recent years, a series of new technologies have been developed in electric arc furnace steelmaking, such as water-cool...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 李维锋朱永军汪正峰颜浩王玉叶敏
Owner SHANGHAI LIER REFRACTORY MATERIAL