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Burned magnesia brick

A magnesia brick and magnesia-aluminum technology, which is applied to the field of fired refractory materials for lining, can solve the problems of unoptimized, unable to use for a long time, and the brick structure becomes brittle, so as to inhibit the structure embrittlement, improve the digestion resistance, and improve the resistance peeling effect

Inactive Publication Date: 2013-06-19
ROZAI IND KAISHA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, magnesia-carbon bricks have the disadvantage that the structure of the bricks becomes brittle due to the oxidation of carbon, so that they cannot be used for a long time
In addition, since carbon dioxide is generated due to the oxidation of carbon, it is not preferable from the viewpoint of preventing global warming.

Method used

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  • Burned magnesia brick
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0048] Hereinafter, an Example and a comparative example are given and the fired magnesia brick of this invention is demonstrated in more detail. The following examples and comparative examples show the influence of the addition amount of each constituent raw material on the properties of bricks.

[0049] According to the compounding ratio shown in the following tables, the raw materials are mixed, and the liquid (pulp waste liquid) of calcium lignosulfonate is mixed as a binding agent, and it is pressurized into a standard shape (230×114× 65mm). This formed body was dried at a temperature of 150° C. for 24 hours, and then fired at a temperature of 1700° C. for 6 hours using a shuttle kiln. The sintered body was cut into a predetermined size, and tests were performed on Examples and Comparative Examples using the following items as evaluation items to investigate characteristics.

[0050] (1) Apparent porosity and bulk density: The bulk density and apparent porosity were mea...

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Abstract

This burned magnesia brick is characterized by being obtained by: adding a binder to 100 wt% of a compound composition that is composed of a magnesia starting material serving as the main starting material, 2-8 wt% of a titania starting material, 3-20 wt% of a magnesia-alumina spinel starting material and / or 3-20 wt% of a mullite starting material, and 0.3-3.0 wt% of a phosphate glass starting material; kneading and molding the resulting compound composition; and then burning the molded compound composition. In addition, corrosion resistance of the burned magnesia brick can be improved by adding 3-20 wt% of a zircon starting material or 0.1-3.0 wt% of a nickel oxide starting material.

Description

technical field [0001] The present invention relates to a fired refractory material for inner lining of a steelmaking furnace, a refining furnace, and the like. Background technique [0002] Conventionally, magnesia-chrome refractories excellent in corrosion resistance and spalling resistance have been used as lining refractories for various furnaces. Since magnesia-chromium refractories will produce hexavalent chromium, which is harmful to human and environmental health after use, it has long been expected to have chrome-free bricks, so-called chrome-free bricks. [0003] As a chromium-free brick, the magnesia-carbon brick which compounded magnesia and carbon, for example is proposed. However, magnesia-carbon bricks have the disadvantage that the structure of the brick becomes brittle due to the oxidation of carbon, so that it cannot be used for a long time. In addition, since carbon dioxide is generated by oxidation of carbon, it is also not preferable from the viewpoint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
CPCC04B35/0435C04B35/66C04B2235/3222C04B2235/3232C04B2235/3248C04B2235/3279C04B2235/3463C04B2235/36C04B2235/77C04B2235/9676F27D1/0006C04B35/03C04B35/10C04B35/46C04B35/64
Inventor 土成昭弘小村隆之
Owner ROZAI IND KAISHA
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