Optimization of preferential lithium extraction from waste ternary lithium ion batteries by carbothermal reduction
The process of carbon thermal reduction-CO2 water immersion was used to preferentially extract lithium from the cathode materials of spent ternary lithium ion batteries.The variables were changed individually such as roasting temperature,roasting duration,effective carbon addition,water leaching duration,solid liquid ratio,CO2 flow rate and countercurrent water washing order to investigate the effects on the leaching rate of metal elements.When roasting temperature was 700℃,roasting time was 120min,effective carbon addition(75.56％carbon powder)was 14％(weight),liquid solid ratio was 10mL/g,water leaching time was 180min,CO2 flow rate was 100mL/min and three stage countercurrent water washing,the leaching rate of lithium could reach 96.31％,and the leaching rates of cobalt,nickel and manganese metals were all lower than 0.1％.This process was applicable to different types of NCM batteries.In addition,the phase changes before and after carbothermal reduction were investigated by XRD,TEM and SEM-EDS.
waste ternary lithium ion batteriescarbothermal reductionpriority lithium extractionleaching rate
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