Optimization of acid leaching process for spent ternary lithium battery black powder based on response surface methodology
Lithium,nickel,cobalt and manganese in spent ternary lithium battery black powder were di-rectly leached by hydrochloric acid.The effects of reaction temperature,acid concentration and time on the leaching rate were investigated by the response surface method based on the Box-Behnken design.The results show that the optimum process conditions of direct acid leaching method were acid concentration 6 mol/L,solid-liquid ratio 250 g/L,reaction temperature 60 ℃,reaction time 7 h,after two leaching,the leaching rate of lithium was 99.96％,nickel was 99.73％,cobalt was 99.90％and that of manganese was 99.82％.
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