Method for producing Al-Si-Fe alloy by carbothermal reduction of waste refractory pretreatment

Abstract

The invention provides a method for preparing aluminum-silicon ferroalloy by pretreatment of waste refractory materials and carbothermal reduction. The waste refractory materials, waste cathode carbon blocks and pulp dry powder are uniformly mixed and made into powder, and then the mixture is pressed into pellets and processed at high temperature. Vacuum distillation volatilizes the fluoride in the waste refractory material and waste cathode carbon block, and then separates it from the waste refractory material and waste cathode carbon block. At the same time, the cyanide in the waste cathode carbon block is decomposed; then the distillation residue is crushed and mixed with the powder. The coal ash is batched and mixed, and the fixed carbon in the waste cathode carbon block is used as a reducing agent in the electric arc furnace to reduce materials mainly composed of alumina and silicon oxide at high temperature to prepare a certain composition of aluminum-silicon ferroalloy; at the same time, during the high-temperature reduction process Complete the decomposition of aluminum nitride in aluminum ash and the complete decomposition of cyanide in spent cathode carbon blocks, achieving comprehensive utilization of multiple hazardous wastes and solid wastes in the same process.

Description

Technical field [0001] The invention relates to the field of electro-metallurgy, in particular to a method for preparing an Al-Si-Fe alloy by pretreatment of waste refractory materials by carbon thermal reduction. Background technique [0002] The production methods of aluminum silicon ferrosilicon are mainly divided into metal fusion method and electrothermal reduction method. The metal fusion method is to use pure metal aluminum, silicon, and iron in a certain proportion in the molten state to form an alloy; the electrothermal reduction method uses oxides containing aluminum, silicon, and iron as raw materials, and uses carbonaceous materials as raw materials The reducing agent is reduced and smelted in an electric arc furnace to prepare an alloy. Among them, the metal fusion method has problems such as reheating of pure metal, secondary burning and high production cost. The electrothermal reduction method also has problems such as the shortage of pure mineral raw materials a...

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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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