废旧三元电池正极活性材料酸性浸出液中钴镍锰锂的分离与回收

The metal ions of most solid powders in the cathode active materials of waste ternary batteries can be transferred to the acid solution by sulfuric acid leaching agent. In this work, the separation and recovery of cobalt, nickel, manganese and lithium in sulfuric acid leaching solution were studied. The proposed precipitation process was precipitated by ammonium oxalate precipitation method-precipitation of cobalt by ammonium bicarbonate precipitation method-precipitation of nickel by sodium hydroxide-sodium hydroxide coprecipitation method-precipitation of lithium by sodium carbonate. The separation conditions were optimized by changing the pH value, temperature, stirring time and amount of precipitant. The experimental results show that under the optimized process conditions, the metal ions in the solution are precipitated in the form of cobalt oxalate, manganese carbonate, basic nickel carbonate and lithium carbonate. The recovery rates of cobalt, manganese, nickel and lithium are 99.17%, 97.88%, 93.47% and 85.21%, respectively. The mass fractions of cobalt oxalate, manganese carbonate, basic nickel carbonate and lithium carbonate are 98.77%, 98.89%, 98.46% and 96.52%, respectively.