Thermodynamic Analysis and Experimental Optimization for the Purification of Ni-Co-Mn Mixed Sulfate Solution from the Recovery Process of Lithium-Ion Batteries
Yuan Zhou,
Jian Yang,
Peisen Zhang,
Zhidong Liu,
Zongliang Zhang,
Ming Jia,
Fangyang Liu,
Liangxing Jiang
Affiliations
Yuan Zhou
School of Metallurgy and Environment, Institute of Light Metal Industry and Electrochemistry, Central South University, Changsha 410083, China
Jian Yang
GEM New Material Co., Jingmen 448000, China
Peisen Zhang
School of Metallurgy and Environment, Institute of Light Metal Industry and Electrochemistry, Central South University, Changsha 410083, China
Zhidong Liu
School of Metallurgy and Environment, Institute of Light Metal Industry and Electrochemistry, Central South University, Changsha 410083, China
Zongliang Zhang
School of Metallurgy and Environment, Institute of Light Metal Industry and Electrochemistry, Central South University, Changsha 410083, China
Ming Jia
School of Metallurgy and Environment, Institute of Light Metal Industry and Electrochemistry, Central South University, Changsha 410083, China
Fangyang Liu
School of Metallurgy and Environment, Institute of Light Metal Industry and Electrochemistry, Central South University, Changsha 410083, China
Liangxing Jiang
School of Metallurgy and Environment, Institute of Light Metal Industry and Electrochemistry, Central South University, Changsha 410083, China
Based on the principles of mass conservation, chemical equilibrium, and electron charge neutrality, a thermodynamic equilibrium system was established for the nickel-cobalt-manganese sulfate leaching solution in the recovery process of spent lithium-ion batteries. By changing the ion concentration in the system, calculating the pH value, and identifying the complexes of Cu2+, Fe3+, PO43−, Al3+, and F− in the system, the results were obtained and used to draw the thermodynamic diagram. The solution thermodynamic calculation and experiment were combined to purify the nickel-cobalt-manganese-rich leachate. The results show that the main Cu2+, Fe3+, PO43−, Al3+, and F− impurity ions could all be reduced to less than 10 ppm under the optimized process parameters.
