Alumina-silicon carbide-carbon refractory material preparation method

A technology for refractory materials and manufacturing methods, applied in the field of refractory materials, can solve the problems of land occupation, raw material prices, rising production costs, and falling product sales prices, so as to reduce manufacturing costs, be conducive to soil and water protection, and prolong maintenance cycles. Effect

Inactive Publication Date: 2009-06-03
上海盛宅金属制品厂 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After reaching the age of the furnace, the treatment container needs to be repaired, and the old inner lining that has been dismantled is discarded. In the long run, these discarded refractory materials are piled up like a mountain, which not only occupies land, but also causes environmental pollution, becoming a big burden for steel enterprises
On the other hand, the refractory material factory is disturbed by the rise in raw material prices and production costs, and on the contrary, the sales price of products has been suppressed and dropped.

Method used

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Embodiment Construction

[0018] The present invention prepares new aluminum oxide (Al 2 O 3 ), silicon carbide and graphite raw materials, the discarded lining refractory material of the molten iron pretreatment container should first be pulverized with a pulverizer or manually: and the impurities in it, especially the components adhering to iron, should be removed. The methods are pickling and water washing, and manual picking or magnetic suction. Then dry (usually at a temperature of 100°C) until the moisture content is ≤0.5%, and finally classify the particles according to the size of 8-5mm, 5-1mm, 1-0.5mm, 0.5-0.08mm and <0.08mm as recycled materials for later use , Determining the proportion of 5 ~ 1mm, 1 ~ 0.5mm, 0.5 ~ 0.08mm and <0.08mm particles at various levels as the calculation basis for the ingredients of recycled materials. Among the above-mentioned new materials, special-grade bauxite containing 86-88% alumina, brown corundum containing about 95% alumina, or sub-white corundum contain...

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Abstract

The refractory Al-SiC-C material includes alumina, SiC and graphite on the carrier of bauxite, brown corundum or white corundum, and features that recovered, crushed and depurated waste furnace lining or inner container is used to replace partial bauxite, brown corundum or white corundum. The reused material results in alumina content accounting for not more than 30 %, and has grain size below 8 mm and water content not more than 0.5 %. The present invention solves the technological problem of utilizing waste Al-SiC-C brick to replace new material without affecting the furnace life.

Description

Technical field: [0001] The invention relates to a refractory material for a molten iron pretreatment smelting vessel, in particular to a method for producing an alumina-silicon carbide-carbon refractory material by using discarded alumina-silicon carbide-carbon bricks. Background technique: [0002] In order to achieve the purification, upgrading and cost reduction of steelmaking, steel mills adopt the hot metal pretreatment method, that is, the hot metal is sent from the blast furnace to the steelmaking furnace for pretreatment such as desiliconization, dephosphorization and desulfurization. The lining refractory material of the container used for pretreatment (such as mixed iron car, ladle, torpedo tank) must consider the erosion caused by the above pretreatment. The unburned brick made of aluminum-silicon carbide-carbon refractory is an excellent refractory material because of its good chemical corrosion resistance, thermal shock resistance, mechanical erosion resistance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/10C04B35/565C04B35/52
Inventor 朱益明卓龙妙王炜
Owner 上海盛宅金属制品厂
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