Abstract:Address to high energy consumption and pollution in the current treatment process, a chlorination roasting process for waste lithium iron phosphate cathode materials was explored. In the calcination process, NH4Cl was used as chlorinating agent to realize phase transformation of lithium and some metals to form soluble chloride salts. The effects of NH4Cl dosage, calcination temperature, calcination time, and atmosphere conditions on chlorination process were investigated. The results show that the waste lithium iron phosphate cathode material is transformed by chlorination roasting, and Fe and Al can be converted into insoluble substances such as Fe2O3, FeOCl and AlPO4 in an oxidizing atmosphere. Fe and Al compounds enter the slag phase, and Li is partially converted into soluble substances, which are selectively leached into solution. This scheme can selectively extract the most valuable metal lithium from waste lithium iron phosphate batteries, and realize resource recovery and efficient utilization.