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Low-chrome magnesite-chrome brick for glass kiln

A chrome-magnesium-chrome brick and glass kiln technology, applied in the field of refractory materials, can solve problems such as hexavalent chromium pollution of the environment, achieve significant social and economic benefits, alleviate pollution, and reduce pollution

Active Publication Date: 2019-03-29
RUITAI MATERIALS TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problems to be solved by the present invention are: 1) Significantly reduce the amount of Cr in magnesia-chrome bricks used in glass kiln regenerators 2 o 3 content in order to alleviate the environmental pollution of hexavalent chromium in residual magnesia-chrome bricks; 2) in reducing the Cr content of magnesia-chrome brick 2 o 3 content while improving the service life of low-chrome magnesia-chrome bricks

Method used

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  • Low-chrome magnesite-chrome brick for glass kiln

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Effect test

Embodiment 1

[0022] A low-chromium magnesia-chrome brick, expressed in mass percentage, its raw material composition is: 20% fused magnesia with a particle size of 4-2mm, 12% fused magnesia with a particle size of 2-1mm, and fused magnesia-aluminum spinel with a size of 2-1mm 10% magnesia, 1-0mm magnesia chrome sand 26%, <0.088mm fused magnesia 32%, in addition add binder sulfurous acid pulp waste liquid and magnesium chloride solution (the binder specific gravity is 1.25 ), the raw materials of the above formula are weighed, kneaded, molded, dried, and fired at 1700°C for 8 hours.

Embodiment 2

[0024] The low-chrome magnesia-chrome brick of the present invention is represented by mass percentage, and the raw materials are composed of: 18% fused magnesia with a particle size of 4-2mm, 11% fused magnesia with a particle size of 2-1mm, and fused magnesia-aluminum spinel with a size of 2-1mm 17%, 1-0mm magnesia chrome sand 23%, <0.088mm fused magnesia 31%; in addition, add binder sulfurous acid pulp waste liquid (binder specific gravity 1.35) accounting for 4% of the total mass of all the above-mentioned raw materials, and mix the above The raw materials of the formula are obtained by weighing, kneading, molding, drying, and firing at 1750°C for 7 hours.

Embodiment 3

[0026] The low-chromium magnesia-chrome brick of the present invention is represented by mass percentage, and the raw materials are composed of: 16% of fused magnesia with a particle size of 4-2mm, 10% of fused magnesia with a particle size of 2-1mm, and fused magnesia-aluminum spinel with a size of 2-1mm 16%,; 1-0mm magnesia chrome sand 23%, <0.088mm fused magnesia 35%; in addition, a binder magnesium chloride solution accounting for 4.5% of the total mass of all the above-mentioned raw materials is added (the specific gravity of the binder is 1.30), and the above formula The raw materials are weighed, kneaded, molded, dried, and fired at 1760°C for 5 hours.

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Abstract

The invention discloses a low-chrome magnesite-chrome brick for a glass kiln. The low-chrome magnesite-chrome brick is prepared from the following raw materials in percentage by mass: 10 to 25 percentof fused magnesite of which the granularity is 2 to 4 mm, 10 to 15 percent of fused magnesite of the which the granularity is 1 to 2 mm, 5 to 20 percent of fused magnesite-alumina spinel of which thegranularity is 1 to 2 mm, 10 to 30 percent of pre-synthesis magnesite-chrome clinker of which the granularity is 0 to 1 mm and 30 to 40 percent of fused magnesite of which the granularity is smallerthan 0.088 mm; in addition, an adhesive accounting for 3 to 5 percent of the total mass of all the raw materials is added. The low-chrome magnesite-chrome brick for the glass kiln, disclosed by the invention, has the property characteristics of low chrome content, high density, high strength, strong erosion resistance and good creep resistance. The low-chrome magnesite-chrome brick is used for a regenerative chamber of the glass kiln, is capable of reducing the chrome content of a refractory material to a large extent and effectively relieving the pollution of hexavalent chrome in a residual brick to environment, and is capable of prolonging the service life of the glass kiln and increasing the running rate of the glass kiln at the same time, so that good economic benefit and good social benefit can be obtained.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a low-chrome magnesia-chrome brick for a glass kiln regenerator. Background technique [0002] With the rapid development of the glass industry, the total output of flat glass in my country ranks first in the world. In recent years, the glass industry is facing the challenge of resolving overcapacity and transformation and upgrading. Whether it is float glass or bottle glass, in order to further reduce costs, the technology of using petroleum coke instead of heavy oil as fuel has been widely used in the glass industry. However, the use of petroleum coke is accompanied by increased erosion and a significant shortening of kiln life. [0003] At present, the upper layer of the regenerator of the glass kiln uses magnesia bricks with an MgO content of about 97%; the magnesia bricks originally used in the upper layer of the regenerator with an MgO content of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/047
CPCC04B35/047C04B2235/3222C04B2235/77C04B2235/96
Inventor 徐琳琳王俊涛徐如林魏瀚闫昕周严敦王杰曾袁林
Owner RUITAI MATERIALS TECHNOLOGY CO LTD
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