无氨氮浸出离子型稀土工艺研究

Study on the Leaching Process of Ionic Rare Earth without Ammonia Nitrogen

为解决稀土工业开采产生严重的水体氨氮污染问题,以强化浸取离子相和还原浸取胶态相为出发点,提出抗坏血酸协同K2SO4浸出离子型稀土技术。结果表明,在K2SO4用量20g/L,滴淋速度0.8mL/min,抗坏血酸用量1.2g/L,初始pH值为2.5,浸出液用量(mL)与稀土矿用量(g)比为0.55∶1等实验条件下,稀土浸出率可达93.35%,为无氨浸出稀土的工业化生产提供参考。

In order to solve the serious problem of ammonia nitrogen pollution in water bodies caused by rare earth industry mining,the technology of ascorbic acid synergistic K2SO4 leaching of ionic rare earth is proposed based on the strengthening of leaching ion phase and reducing leaching of colloidal phase.The results showed that under experimental conditions such as K2SO4 dosage of 20 g/L,dripping rate of 0.8 mL/min,ascorbic acid dosage of 1.2 g/L,initial pH value of 2.5,and ratio of leaching solution(mL)dosage to rare earth ore dosage(g)of 0.55:1,the rare earth leaching rate can reach 93.35%,providing a reference for the industrial production of ammonia free rare earth leaching.