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A kind of magnesia carbon brick and preparation method thereof

A technology of magnesia-carbon bricks and fused magnesia, which is applied in the field of refractory materials, can solve problems such as poor high temperature resistance, easy oxidation, and performance degradation of magnesia-carbon bricks, and achieve high surface activity, reduced apparent porosity, and improved impact strength. Effect

Active Publication Date: 2021-06-08
北京利尔高温材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of magnesia-carbon brick and its preparation method, through the design of magnesia-carbon brick to solve the use of phenolic resin as binder in the prior art, poor high temperature resistance and easy oxidation, resulting in magnesia-carbon brick Technical problems of carbon brick performance decline

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] Specifically, the preparation method of modified phenolic resin comprises the following steps:

[0029] Configure phenol and formaldehyde mixed solution, wherein the molar ratio of phenol and formaldehyde mixed solution is 1:1.2;

[0030] Add nano-silicon carbide and nano-carbon black to the mixed solution of phenol and formaldehyde, the total mass of nano-silicon carbide and nano-carbon black is 1% of the mixed solution of phenol and formaldehyde; add sodium hydroxide, heat, stir, heat up to 80 ° C, and keep the temperature After 2-3 hours, add acetic acid and vacuum dehydrate to obtain modified phenolic resin.

[0031] Specifically, the mass ratio of nano-silicon carbide and nano-carbon black is 1:1.2;

[0032] Specifically, in the fused magnesia, MgO≥97.2, CaO≤2.0, SiO 2 ≤1.5, Fe 2 o 3 ≤0.8, particle bulk density ≥3.45g / ㎝ 3 .

[0033] Specifically, the particle size of the graphite is 0-0.088mm, wherein C in the graphite is ≥ 96.0%; the graphite is flake graphi...

Embodiment 1

[0043] Preparation of Sample 1:

[0044] 101) Prepare a mixed solution of phenol and formaldehyde, wherein the molar ratio of the mixed solution of phenol and formaldehyde is 1:1.2; add nano-silicon carbide and nano-carbon black to the mixed solution of phenol and formaldehyde, and the total mass of nano-silicon carbide and nano-carbon black is phenol 1% of mixed solution with formaldehyde; add sodium hydroxide, heat, stir, heat up to 80°C, keep the temperature for 2-3 hours, add acetic acid, vacuum dehydrate to obtain modified phenolic resin, among which, nano-silicon carbide and nano-carbon black The ratio is 1:1.2;

[0045]102) Weigh 22 parts of fused magnesia with a particle size of 3mm-5mm and 24 parts of fused magnesia with a particle size of 1mm-3mm, mix for 1-2min, and mix with 1 part of modified phenolic resin at 40-50°C, Stir for 2-3 minutes; add 15 parts of fused magnesia with a particle size of 0-1mm, 20 parts of fused magnesia with a particle size of 0-0.088, and...

Embodiment 2

[0052] Preparation of sample 2:

[0053] 201) Prepare a mixed solution of phenol and formaldehyde, wherein the molar ratio of the mixed solution of phenol and formaldehyde is 1:1.2; add nano-silicon carbide and nano-carbon black to the mixed solution of phenol and formaldehyde, and the total mass of nano-silicon carbide and nano-carbon black is phenol 1% of mixed solution with formaldehyde; add sodium hydroxide, heat, stir, heat up to 80°C, keep the temperature for 2-3 hours, add acetic acid, vacuum dehydrate to obtain modified phenolic resin, among which, nano-silicon carbide and nano-carbon black The ratio is 1:1.2;

[0054] 202) Weigh 23 parts of fused magnesia with a particle size of 3mm-5mm and 26 parts of fused magnesia with a particle size of 1mm-3mm, mix for 1-2min, and mix with 3 parts of modified phenolic resin at 40-50°C, Stir for 2-3 minutes; add 18 parts of fused magnesia with a particle size of 0-1mm, 5 parts of fused magnesia with a particle size of 0-0.088, an...

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Abstract

The invention relates to the technical field of refractory materials, in particular to a magnesia-carbon brick and a preparation method thereof; comprising 55-110 parts of fused magnesia, 12-16 parts of graphite, 1-3 parts of binder and 1-6 parts of additives; Among them, the binder is modified phenolic resin; through the design of magnesia-carbon bricks, the technology of using phenolic resin as a binder for magnesia-carbon bricks in the prior art, poor high temperature resistance and easy oxidation, resulting in a decrease in the performance of magnesia-carbon bricks question.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a magnesia-carbon brick and a preparation method thereof. Background technique [0002] Magnesia carbon brick is a high-quality refractory material with high refractoriness, good slag corrosion resistance, strong thermal shock resistance and low high temperature creep. be widely used. [0003] Magnesia-carbon bricks are composed of fused magnesia, graphite, binders and additives. In the binder, phenolic resin has the characteristics of good adhesion, corrosion resistance, thermal shock stability and high carbonization rate, so it is It is widely used as a binder for magnesia carbon bricks. However, phenolic resin has poor high temperature resistance and unsatisfactory oxidation resistance. With the continuous improvement of the requirements for the variety of steel, the smelting environment becomes more harsh. Therefore, there is an urgent need for a high temperat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/043C04B35/634C08G8/10C08K3/34C08K3/04
CPCC04B35/043C04B35/63476C04B2235/402C04B2235/425C04B2235/428C04B2235/48C04B2235/77C04B2235/96C08G8/10C08K3/04C08K3/34C08K2201/011
Inventor 王伟伟赵现堂曹贺刘丽王志星颜浩任林刘靖轩
Owner 北京利尔高温材料股份有限公司
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