A crucible for preparing aluminum-based master alloy by thermite reduction method

Abstract

The invention belongs to the metallurgy field, in particular to a composite type crucible for preparing an aluminum-base intermediate alloy. The crucible for preparing the aluminum-base intermediate alloy is composed of a pedestal, a lower furnace body and an upper protective jacket. The outer layers of the crucible pedestal, furnace body and protective jacket use structural steel dies. A pedestal liner is composed of aluminum oxide bricks and magnesium oxide bricks in a bricking mode; each of a furnace body liner and a protective jacket liner is compose of aluminum oxide bricks in a bricking mode. The part between a crucible liner and the outside die is filled with aluminum oxide slag powder which serves as insulation material. Aluminothermic reduction reaction is mainly performed in the furnace body, and the protective jacket plays a role of preventing the melt splashing and overflowing in the reaction. The crucible can be used for preparing different kinds of aluminum-base intermediate alloys. The crucible is simple in manufacturing procedure, short in manufacturing period, high in efficiency and capable of using byproducts of the aluminothermic reduction reaction so as to greatly lower the production cost; and moreover, because the crucible liner is made of byproducts of the aluminothermic reduction reaction, the crucible protects the alloy from impurity pollution.

Description

Technical field: [0001] The invention relates to a composite crucible, in particular to a composite crucible for preparing an aluminum-based master alloy by an aluminothermic reduction method and a preparation process thereof, belonging to the field of metallurgy. Background technique [0002] Aluminum-based master alloys are widely used as additives for smelting high-temperature alloys, titanium alloys, aluminum alloys and non-ferrous metal materials. There are many methods for preparing aluminum-based master alloys, among which the aluminothermic reduction method plays an important role because of its low cost and simple process. In industry, copper, graphite crucibles, magnesia brick crucibles or alumina sintered crucibles are generally used to prepare aluminum-based master alloys. The alloy prepared by copper crucible has less impurities, but the cost of copper crucible is high and the risk of water cooling is high; although the cost of graphite crucible is low, it is e...

AI Technical Summary

Problems solved by technology

The alloy prepared by using copper crucible has less impurities, but the cost of copper crucible is high and the risk of water cooling is high; although the cost of graphite crucible is low, it is easy to cause carbon pollution

At the same time, the production capacity of copper crucible and graphite crucible is also low

The magnesia brick crucible and alumina sintered crucible have a large capacity, but magnesia bricks have poor thermal shock resistance and can only be used once, resulting in high cost of magnesia brick crucibles, and because ordinary magnesia bricks contain high Silicon and iron oxide are easy to cause impurity pollution to the intermediate alloy product; the alumina sintered crucible basically does not cause impurity pollution to the product, and the reaction by-product aluminum oxide can be recycled, but the production process of the aluminum oxide crucible is complicated It is cumbersome, and it needs to go through the processes of vibration molding, sintering and cooling of the inner lining and outer wall. The entire production cycle is as long as 24 hours. The efficiency is low and the cost of consumption is also high.

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