A composite electro-fusing refractory material and method for preparing the same

Abstract

The invention refers to a production method of electrocast refractories composite. The technical project is mixing 20-90 % aluminium ash and alumina or 10-80% magnesium-containing compound according to weight percent, pressing to compact, electric smelting in 1800-3000deg C, taking off after chilled, and then bruising, separating and the getted electrocast refractories composite is electro-melting corundum or electro-melting magnesium aluminate spinel compound. Thereinto: the percentage content of main component in chemical aluminium ash is Al2O3 10-70%, Al 10-40%, MgO 0.3-20%, SiO2 0.5-30%;Magnesium-containing compound is one or two kind of magnesium carbonate and magnesia. This invention using non-oxidized substance such as metal alumina, aluminium nitride and so on of aluminium ash as main reductor, fuse deacidizing oxidate such as SiO2,Fe2O3,TiO2 and so on in alumina or aluminium ash, so electrical energy consumption is low and environmental contamination is light; The prepared electro-melting corundum or magnesium aluminate spinel compoud has the character of low carbin containing.

Description

1. Technical field [0001] The invention belongs to the technical field of composite refractory material production. In particular, it relates to a production method of an electrofusion composite refractory material. 2. Background technology [0002] In the production process of electrolytic aluminum, aluminum materials, and aluminum products, a large amount of waste residues will be generated. Usually, after recycling some of the metal aluminum, the remaining residues are discarded as garbage. These wastes are called aluminum slag or aluminum ash, also known as Aluminium slag ash. The chemical composition of aluminum ash is mainly Al 2 O 3 , SiO 2 , MgO, Fe 2 O 3 , Na 2 O, CaO and metal aluminum are the main ones, as well as some nitrides, chlorides and sulfides. General SiO 2 At 5~20%, Al 2 O 3 At 40-75%, the proportion of its chemical composition varies slightly with the raw materials and operating conditions of each manufacturer. [0003] Aluminum ash is a kin...

AI Technical Summary

Problems solved by technology

There are limitations in this method at present: (1) Al in the aluminum ash is required 2 o 3 (2) A large amount of metal aluminum in the washed aluminum ash is hydrated, resulting in the reduction of metal aluminum, which is not conducive to the reduction reaction; (3) Carbothermal reduction of SiO 2 , Fe 2 o 3 、TiO 2 Compared with aluminothermic reduction, it is easy to introduce too much carbon and form carbides, which will affect the performance of the final product.