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

(NH₄)₂CO₃ leaching method is an efficient and green selective vanadium extraction method. Studying its leaching kinetic mechanism can improve the adaptability and industrial production of this method and further promote the development of green extraction of vanadium resources. This work used different leaching temperatures to study the variation of vanadium leaching efficiency with leaching time to elucidate the leaching kinetics of vanadium. Results showed that the leaching process consists of two stages and both of which complied with shrinking core model (SCM). The apparent activation energies (E_a) 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.