Leaching Kinetics of Vanadium from Calcification Roasted Vanadium Slag in (NH4)2CO3

(NH4)2CO3(NH)CO leaching method is an efficient and green selective vanadium extractionVanadium extraction method. Studying its leaching kineticLeaching kinetics mechanism can improve the adaptability and industrial production of this method and further promote the development of green extraction of vanadiumVanadium resources. This work used different leaching temperatures to study the variation of vanadiumVanadium leaching efficiency with leaching time to elucidate the leaching kineticsLeaching kinetics of vanadiumVanadium. Results showed that the leaching process consists of two stages and both of which complied with shrinking core model (SCM). The apparent activation energies (Ea) of leaching process were 8.80 kJ/mol (0–15 min) and 9.68 kJ/mol (15–70 min), respectively. The leaching rate in 0–15 min was controlled by solid product layer diffusion, and the leaching rate in 15–70 min was controlled by solid product layer diffusion and chemical reactions, and diffusion control played a significant role.