Method for preparing aluminum silicon ferroalloy by carbothermal reduction of aluminum ash pretreatment

Abstract

The invention provides a method for pre-treating aluminum ash and carbothermal reduction to prepare aluminum-silicon ferroalloy. The secondary aluminum ash, waste cathode carbon block 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 and chloride in the aluminum ash and the fluoride and metallic sodium in the spent cathode carbon block, and then separates them from the aluminum ash and spent cathode carbon block. At the same time, the cyanide in the spent cathode carbon block is decomposed; The distillation slag is then crushed and mixed with fly ash. The fixed carbon in the waste cathode carbon block is used as a reducing agent in an electric arc furnace to reduce the materials mainly alumina and silicon oxide at high temperature to prepare a certain composition of aluminum silicon. Iron alloy; at the same time, the decomposition of aluminum nitride in aluminum ash and the complete decomposition of cyanide in spent cathode carbon blocks are completed during the high-temperature reduction process, 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 electrometallurgy, in particular to a method for preparing aluminum-silicon-ferroalloy through carbon-thermal reduction of aluminum ash pretreatment. 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 min...

AI Technical Summary

Problems solved by technology

[0006] 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

Images