Kinetics of Ni and Co Recovery via Oxygen-Enriched Pressure Leaching from Waste Lithium-Ion Batteries

In the process of comprehensive recovery and utilization discarded lithium-ion batteries via acid leaching, a large number NiS CoS mixed materials are produced. To improve metal rate, kinetics rate-determining step oxygen-rich pressurized leaching Ni Co were investigated. The results showed that rates greater than 99% under following conditions: sulfuric (leaching agent) concentration 95 g/L, liquid-to-solid ratio 6:1, time 120 min, temperature 110 °C, stirring speed 400 r/min, 90% atmosphere, pressure 1.2 MPa. was described by shrinking unreacted core model, conformed to kinetic equation 1 − (1 x)1/3 = k·t. apparent activation energies reactions 50.87 45.6 kJ/mol, respectively, found be controlled chemical reaction at interface.