Sustainable Mining and Metallurgy

Aiming at the prominent problems of high energy consumption and low efficiency in the disposal of hazardous waste aluminum ash in the aluminum industry, through process and technological innovation, based on thermodynamic analysis, new disposal technologies such as grinding, microwave field and inert large particle assisted strengthening were proposed. Chlorine, silicon chloride and chlorinesilicon chloride were used as chlorinating agents, respectively. Five new processes for efficient chlorination of aluminum ash were developed ( a method for efficient utilization of aluminum ash with chlorine as chlorinating agent, a method for highvalue utilization of secondary aluminum ash with chlorine as chlorinating agent, a method for efficient preparation of aluminum nitride with aluminum ash with chlorine as chlorinating agent, a method for efficient preparation of aluminum fluoride with aluminum ash with silicon chloride as chlorinating agent, a method for preparation of aluminum fluoride with aluminum ash with chlorinesilicon chloride as chlorinating agent ). These five processes can effectively improve the resource utilization rate and disposal efficiency of aluminum ash, and realize the deep highvalue utilization of aluminum ash ( preparation of aluminum nitride and aluminum fluoride ), which has significant economic and social benefits.