Half-heavy refractory brick for dry-quenching furnace annular air duct and production method of half-heavy refractory brick

A technology for a CDQ oven and an annular air duct is applied in the field of refractory bricks for semi-heavy CDQ oven annular air ducts and its preparation, which can solve the problems of poor thermal damage resistance, easy bulging of bricks, increased cost, and the like. The effect of good heat storage effect, weight reduction and production cost reduction

Inactive Publication Date: 2016-12-07
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the material problem of refractory bricks used in the inner wall of the annular air duct of CDQ coke ovens. By adopting semi-heavy materials, it can overcome the bricks used in the annular air duct that are easy to bulge, crack, and have poor thermal damage resistance, resulting in frequent maintenance. , the lack of cost increase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A refractory brick for semi-heavy dry quenching coke oven annular air duct, the raw materials and weight percentage content are: mullite aggregate with a particle size of 5-3mm: 25%, mullite bone with a particle size of less than 3-1mm Material: 20%, mullite with particle size less than 1 to 0.074mm Aggregate: 8%, andalusite with particle size less than 1 to 0.074mm: 8%, mullite fine powder 15.5%, andalusite fine powder 10%, particle size Hollow spheres not exceeding 3mm: 5%, of which hollow spheres less than 1mm accounted for 80%, kaolin powder 5%, water glass 0.5%, pulp waste liquid 3%.

[0033] Preparation:

[0034] 1) First mix the hollow sphere and water glass to a wet state;

[0035] 2) Add mullite fine powder with a particle size of less than 0.074mm, andalusite fine powder with a particle size of less than 0.074mm and kaolin fine powder with a particle size of less than 0.045mm to the mixed material in step 1);

[0036] 3) Mix all mullite aggregates, andalusit...

Embodiment 2

[0042] A refractory brick for semi-heavy dry quenching coke oven annular air duct, the raw materials and weight percentage content are: mullite aggregate with a particle size of 5-3mm: 16%, mullite bone with a particle size of less than 3-1mm Material: 30%, mullite with particle size less than 1 to 0.074mm Aggregate: 5%, andalusite with particle size less than 1 to 0.074mm: 5%, mullite fine powder 20%, andalusite fine powder 8%, particle size Hollow spheres not exceeding 3mm: 10%, of which hollow spheres less than 1mm accounted for 95%, superfine kaolin powder 3%, silica sol 0.5%, dextrin 2.5%.

[0043] Preparation:

[0044] 1) Mix the hollow sphere and silica sol to a wet state;

[0045] 2) Add mullite fine powder with a particle size of less than 0.074mm, andalusite fine powder with a particle size of less than 0.074mm and kaolin fine powder with a particle size of less than 0.045mm to the mixed material in step 1);

[0046] 3) Mix all mullite aggregates, andalusite with a...

Embodiment 3

[0052]A kind of refractory brick for semi-heavy dry quenching coke oven annular air duct, its composition raw materials and weight percentage content are: mullite aggregate with a particle size of 5-3mm: 20%, mullite bone with a particle size of less than 3-1mm Material: 15%, mullite with particle size less than 1 to 0.074mm Aggregate: 15%, andalusite with particle size less than 1 to 0.074mm: 6%, mullite fine powder 30%, andalusite fine powder 3%, particle size Hollow spheres not exceeding 3mm: 5%, of which hollow spheres less than 1mm accounted for 92%, kaolin powder 3%, aluminum sol 1.5%, dextrin 1.5%.

[0053] Preparation:

[0054] 1) First mix the hollow spheres with the aluminum sol to a wet state;

[0055] 2) Add mullite fine powder with a particle size of less than 0.074mm, andalusite fine powder with a particle size of less than 0.074mm and kaolin fine powder with a particle size of less than 0.045mm to the mixed material in step 1);

[0056] 3) Mix all mullite aggr...

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Abstract

Disclosed is a half-heavy refractory brick for dry-quenching furnace annular air duct. The half-heavy refractory brick is produced from raw materials including, by weight, 16%-25% of mullite aggregates 5-3mm in particle size, 15%-30% of mullite aggregates smaller than 3-1mm in particle size, 5%-15% of mullite aggregates smaller than 0.074mm in particle size, 5%-15% of andalusite smaller than 1-0.074 in particle size, 10%-30% of fined mullite powder, 3%-10% of fined andalusite powder, 5%-20% of hollow spheres, 1%-8% of kaolin micro powder, 0.01%-2% of an interface treating agent and 2%-5% of a binding agent. The production method includes: firstly, mixing the hollow spheres with the interface treating agent; then adding the fined mullite powder, the fined andalusite powder and the kaolin micro powder; evenly mixing all of the mullite aggregates, the andalusite, the hollow spheres and the binding agent; pressing into a brick; drying; baking for standby use. By the arrangement, problems that the brick for the dry-quenching furnace annular air duct is prone to bloating and cracking are solved, compression strength of the brick can reach more than 60MPa, unit weight of the brick can be lowered more than 10%, and usage period is greatly prolonged.

Description

technical field [0001] The invention relates to a refractory material used in the metallurgical industry and a preparation method thereof, in particular to a refractory brick for a semi-heavy CDQ coke oven annular air duct and a preparation method thereof. Background technique [0002] Domestic CDQ technology is developing rapidly. The factors affecting the life of CDQ ovens include the balance and coordination of different parts of the cooling section, chute, and annular air duct. The annular air duct is prone to abnormal collapse due to swelling, and each maintenance is hundreds of thousands of yuan. affect production. Technical exchanges at home and abroad have found that the abnormal collapse of the circular air duct at home and abroad is an industry problem, including Nippon Steel, which has not been completely solved. Every year, 3-5 coking plants have accidents that are forced to be overhauled due to abnormal collapse. [0003] The biggest problems with annular ducts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/185
CPCC04B35/66C04B35/185C04B2235/3418C04B2235/3463C04B2235/349C04B2235/77C04B2235/96C04B2235/9607
Inventor 徐国涛盛军波陈胜春张洪雷
Owner 武汉钢铁有限公司
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