Research on the Technology and Process Optimization of Aluminum Ash Resource Utilization
Harmful solid waste is generated during the aluminum electrolysis process,which is called aluminum ash.In 2020,aluminum ash was listed as hazardous waste.According to statistics,China produces over 3.5 million tons of aluminum ash annually,and the vast majority of aluminum ash is treated by landfill,which poses significant environmental risks.Under the concept of green and low-carbon,promoting the resource utilization of aluminum ash has become an inevitable trend.This article introduced the resource utilization technology of primary and secondary aluminum ash,among them,primary aluminum ash was mainly used for recovering metallic aluminum,and secondary aluminum ash was used for preparing refractory materials and building materials.In addition,harmless treatment technologies for aluminum ash were also discussed,including aluminum nitride removal and fluoride and chloride salt removal technologies.
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