Leaching Niobium from Bayan Obo Ore with Hydrofluoric Acid and Its Kinetics
Aiming at the comprehensive utilization of niobium minerals in Bayan Obo tailings,the optimum parameters of niobium leaching process were determined by using HF as leaching agent,and the leaching kinetics was studied.The results show that the leaching rate of niobium-containing minerals can reach 90.91％under the conditions of reaction temperature of 90 ℃,liquid volume to solid mass ratio of 7/1,HF concentration of 20 mol/L,reaction time of 2 h and stirring rate of 300 r/min.The leaching process of niobium is consistent with the nuclear shrinkage model,and the leaching process is controlled by chemical reaction and diffusion mixture,and the apparent activation energy of the leaching reaction is 35.459 kJ/mol.This method can effectively extract niobium from tailings and is beneficial to subsequent separation and purification.
Bayan Obo tailingsniobium mineralsniobiumhydrofluoric acidleachingkinetics
万方数据
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