Unfired magnesia-calcium-carbon brick and preparation method thereof

A non-burning magnesia-calcium-carbon brick and magnesia-calcium sand technology, applied in the field of refractory materials, can solve problems such as deformation, brick body falling off, brick body cracking, etc., and achieve high service life, strong corrosion resistance, and good high temperature stability. Effect

Pending Publication Date: 2021-09-07
SHANXI LUWEIBAO TAIGANG REFRACTORIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the corrosion of unfired magnesia-calcium-carbon bricks for AOD furnaces is mainly due to the dissolution and penetration of the silicate liquid phase, while unfired magnesia-calcium-carbon bricks for VOD ladles are subjected to many chemical media and mechanical forces during

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Unfired magnesia-calcium carbon bricks, including the following raw materials: 10kg of magnesia-calcium sand with a particle size of 4-7mm, 30kg of magnesia-calcium sand with a particle size of 1-4mm, and 20kg of magnesia-calcium sand with a particle size of <1mm. 10kg of fused magnesia with a particle size of 0.5-5mm and 10kg of fused magnesia with a particle size of <0.5mm, 5kg of flake graphite with a particle size of 0.06-0.08mm, 8kg of zirconia micropowder with a particle size of 0.03-0.05mm, and a particle size of 8kg of silicon carbide powder of 0.005-0.01mm, 5kg of phenolic resin with a viscosity of 8000mPa s and 5kg of modified asphalt with a viscosity of 40000mPa s;

[0035] The preparation method of the above-mentioned unfired magnesia-calcium-carbon brick specifically comprises the following steps:

[0036] (1) take each raw material by the weight of above-mentioned unfired magnesia-calcium-carbon brick;

[0037] (2) Dry-mix magnesia-calcium sand, fused mag...

Embodiment 2

[0041] Unfired magnesia-calcium carbon bricks, including the following raw materials: 15kg of magnesia-calcium sand with a particle size of 4-7mm, 40kg of magnesia-calcium sand with a particle size of 1-4mm, and 25kg of magnesia-calcium sand with a particle size of <1mm. 15kg of fused magnesia with a particle size of 0.5-5mm and 15kg of fused magnesia with a particle size of <0.5mm, 8kg of flake graphite with a particle size of 0.06-0.08mm, 5kg of zirconia micropowder with a particle size of 0.03-0.05mm, and a particle size of 5kg of silicon carbide powder of 0.005-0.01mm, 3kg of phenolic resin with a viscosity of 9000mPa s and 3kg of modified asphalt with a viscosity of 45000mPa s;

[0042] The preparation method of the above-mentioned unfired magnesia-calcium-carbon brick specifically comprises the following steps:

[0043] (1) take each raw material by the weight of above-mentioned unfired magnesia-calcium-carbon brick;

[0044] (2) Dry-mix magnesia-calcium sand, fused mag...

Embodiment 3

[0048]Unfired magnesia-calcium carbon bricks, including the following raw materials: 20kg of magnesia-calcium sand with a particle size of 4-7mm, 50kg of magnesia-calcium sand with a particle size of 1-4mm, and 30kg of magnesia-calcium sand with a particle size of <1mm. 20kg of fused magnesia with a particle size of 0.5-5mm, 20kg of fused magnesia with a particle size of <0.5mm, 10kg of flake graphite with a particle size of 0.06-0.08mm, 3kg of zirconia powder with a particle size of 0.03-0.05mm, and 3kg of silicon carbide powder of 0.005-0.01mm, 2kg of phenolic resin with a viscosity of 10000mPa s and 2kg of modified asphalt with a viscosity of 50000mPa s;

[0049] The preparation method of the above-mentioned unfired magnesia-calcium-carbon brick specifically comprises the following steps:

[0050] (1) take each raw material by the weight of above-mentioned unfired magnesia-calcium-carbon brick;

[0051] (2) Dry-mix magnesia-calcium sand, fused magnesia, zirconia micropowde...

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Abstract

The invention discloses an unfired magnesia-calcium-carbon brick which is prepared from the following raw materials in parts by weight: 60 to 100 parts of magnesia-calcium sand, 20 to 40 parts of fused magnesia, 5 to 10 parts of crystalline flake graphite, 3 to 8 parts of zirconium oxide micro powder, 3 to 8 parts of silicon carbide micro powder, 2 to 5 parts of phenolic resin and 2 to 5 parts of modified asphalt. The preparation method comprises the following steps: (1) weighing the raw materials; (2) carrying out dry mixing on magnesia-calcium sand, fused magnesia and zirconia micro powder, then adding phenolic resin and modified asphalt, carrying out wet mixing, then adding the crystalline flake graphite mixture, and finally adding the silicon carbide micro powder mixture; (3) pouring into a mold, pressurizing to form a blank, and baking; and (4) dipping with paraffin, and packaging by adopting double-layer plastic package. The unfired magnesia-calcium-carbon brick prepared by the preparation method is large in volume density, high in strength, difficult to hydrate and crack, strong in erosion resistance, good in high-temperature stability, difficult to peel off during use, long in service life and applicable to steel ladles of high-grade steel such as stainless steel, special steel and the like.

Description

technical field [0001] The invention relates to the technical field of refractory materials, and more specifically relates to an unfired magnesia-calcium-carbon brick and a preparation method thereof. Background technique [0002] Unfired magnesia-calcium-carbon brick is an alkaline refractory material made of MgO, CaO and C as the main components, which is pressed under high pressure and dried by electric heating. It has excellent slag erosion resistance, slag permeability, and thermal shock stability. and thermal conductivity. [0003] At present, unfired magnesia-calcium-carbon bricks are widely used in stainless steel refining VOD furnaces, AOD furnaces and LF furnaces. They have broad market prospects and will play a huge role in promoting the technological progress of my country's iron and steel enterprises. However, the corrosion of unfired magnesia-calcium-carbon bricks for AOD furnaces is mainly due to the dissolution and penetration of the silicate liquid phase, w...

Claims

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Application Information

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IPC IPC(8): C04B35/66
CPCC04B35/66C04B2235/3206C04B2235/3208C04B2235/3244C04B2235/3826C04B2235/425C04B2235/48C04B2235/5427C04B2235/5436C04B2235/602C04B2235/656C04B2235/6567C04B2235/77C04B2235/96
Inventor 梁春莲李高平申向利
Owner SHANXI LUWEIBAO TAIGANG REFRACTORIES CO LTD
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