Thermodynamic Analysis and Experimental Optimization for the Purification of Ni-Co-Mn Mixed Sulfate Solution from the Recovery Process of Lithium-Ion Batteries

Based on the principles of mass conservation, chemical equilibrium, and electron charge neutrality, a thermodynamic equilibrium system was established for nickel-cobalt-manganese sulfate leaching solution in recovery process spent lithium-ion batteries. By changing ion concentration system, calculating pH value, identifying complexes Cu2+, Fe3+, PO43−, Al3+, F− results were obtained used to draw diagram. The calculation experiment combined purify nickel-cobalt-manganese-rich leachate. show that main impurity ions could all be reduced less than 10 ppm under optimized parameters.