Preparation method for rebonded electrically fused chrome corundum brick

A chrome corundum brick and recombination technology is applied in the field of refractory materials, which can solve the problems of poor corrosion resistance and shorten the service life of lining bricks in smelting furnaces, and achieves strong corrosion resistance, good thermal shock stability and high refractoriness. Effect

Active Publication Date: 2012-07-04
ZHENGZHOU HUAWEI REFRACTORIES
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Problems solved by technology

At present, the slag composition of non-ferrous metal smelting furnace is mostly Fe 2 o 3 - SiO 2 -CaO slag system, the main reason for the damage of high-quality fused rebonded magnesia-chrome bricks mainly used as linings is that although these products belong to the polycrystalline composite spinel

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Embodiment Construction

[0026] The preparation method of electrofusion rebonding chrome corundum brick of the present invention, it comprises the following steps:

[0027] The first step, material preparation

[0028] a. Synthetic fused chromium corundum material: according to Al 2 o 3 :Cr 2 o 3= The weight ratio of 75-90:8-15 takes raw material Al 2 o 3 and Cr 2 o 3 , mix it and break it into pellets with a particle size of ≤3mm for later use; in actual preparation, the weight ratio between the two can be Al 2 o 3 :Cr 2 o 3 =75:8, also can be Al 2 o 3 :Cr 2 o 3 =83:12, can also be Al 2 o 3 :Cr 2 o 3 =90:15;

[0029] b. Preparation of chromium ore material: crush the chromium ore raw material into a powder with a particle size of ≤1.5mm for later use, and Cr in the chromium ore raw material used 2 o 3 The content is 40-60%, Fe 2 o 3 The content is 13-30%, SiO 2 The content is 2.3-3.5%, the others are impurities;

[0030] c. Preparation of corundum material: take Al 2 o 3 Th...

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Abstract

The invention discloses a preparation method for a rebonded electrically fused chrome corundum brick. Corundum granules, chrome ore powder and chromic oxide powder are first prepared, electrically fused chrome corundum granules are synthesized according to a certain proportion, the materials are weighed according to 40 to 70 parts of corundum material, 8 to 20 parts of chrome ore material, 15 to 30 parts of synthesized electrically fused chrome corundum material and 1 to 3 parts of chromic oxide material, put into a mixing mill, added with aluminium dihydrogen phosphate solution, mixed, milled and pressed to form a semifinished green brick, and after drying and sintering, the finished product is prepared. The rebonded electrically fused chrome corundum brick has the characteristics of high refractoriness, high strength, high thermal shock resistance and strong corrosion resistance; because high-melting point chromohercynite and hercynite can be produced on the surface of a furnace liner and stuck on the furnace liner to form a protective layer, thus not only can the scouring resistance of the furnace liner be enhance, but also melt can be stopped from infiltrating the brick, and thereby the service life of the brick can be greatly prolonged.

Description

technical field [0001] The invention relates to a refractory material, in particular to a method for preparing an electrofusion rebonded chromium corundum brick used for the inner lining of a nonferrous metal smelting furnace. Background technique [0002] With the rapid development of the non-ferrous metallurgical industry, the output of non-ferrous metals such as copper, nickel, lead, zinc and aluminum in my country has exceeded 19 million tons, ranking first in the world for five consecutive years. Due to the sharp increase in the world's non-ferrous metal prices (copper has reached 6,000 US dollars / ton), my country's non-ferrous metal industry has also entered a period of rapid development. At present, the slag composition of non-ferrous metal smelting furnace is mostly Fe 2 o 3 - SiO 2 -CaO slag system, the main reason for the damage of high-quality fused rebonded magnesia-chrome bricks mainly used as linings is that although these products belong to the polycrysta...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/63C04B35/622
Inventor 王慧洲师素环姚峰黄昕郑铠锋聂红强刘俊杰杨怀斌李爱功郭炎峰赵晓科黄耀军
Owner ZHENGZHOU HUAWEI REFRACTORIES
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