Method for preparing Al-Si-Fe alloy by preprocessing waste fireproof material and carbon thermal reduction

Abstract

The invention provides a method for preparing an Al-Si-Fe alloy by preprocessing a waste fireproof material and carbon thermal reduction. The method for preparing the Al-Si-Fe alloy by preprocessing the waste fireproof material and carbon thermal reduction comprises the steps that the waste fireproof material, waste negative electrode carbon blocks and paper pulp dry powder are uniformly mixed andmade into powder; then the mixed material is compressed into pellets, high temperature vacuum distillation is conducted so that fluoride in the waste fireproof material and the waste negative electrode carbon blocks volatilize, then the fluoride is separated from the waste fireproof material and the waste negative electrode carbon blocks, and meanwhile, cyanide in the waste negative electrode carbon blocks is decomposed; then distillation residues are smashed and dispensed and mixed with coal ash, and fixed carbon in the waste negative electrode carbon blocks is adopted as a reducing agent inan electric arc furnace so that high temperature reduction can be conducted on a material with aluminum oxide and silicon oxide being the main components, and then the Al-Si-Fe alloy with certain components is prepared; and meanwhile, decomposition of aluminum nitride in aluminum ash and total decomposition of cyanide in the waste negative electrode carbon blocks are completed in the high temperature reduction process, and comprehensive utilization of multiple hazardous wastes and solid wastes is achieved in the same technology.

Description

technical field [0001] The invention relates to the field of electrometallurgy, in particular to a method for preparing an aluminum-silicon-ferroalloy through carbothermal reduction of waste refractory materials. Background technique [0002] The production methods of aluminum silicon ferrosilicon are mainly divided into metal melting method and electrothermal reduction method. The metal melting method is to use pure metal aluminum, silicon, and iron to form alloys in a molten state according to a certain proportion; the electrothermal reduction method uses oxides containing aluminum, silicon, and iron as raw materials, and carbonaceous materials as raw materials. The reducing agent is used to prepare the alloy through reduction smelting in an electric arc furnace. Among them, the metal fusion method has problems such as reheating of pure metal, secondary burning loss and high production cost. The electrothermal reduction method also has problems such as shortage of pure m...

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Problems solved by technology

[0007] From the above analysis, it can be seen that the hazardous waste and solid waste generated in the current electrolytic aluminum, aluminum processing and power industries are treated separately, most of which are in the stage of harmless treatment, and effective resource utilization is still in the research stage. As a result, the environmental pollution problems of these solid wastes have not been fundamentally solved

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