Study on Complex Leaching Process of Bastnaesite AITranslate

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Chinese Library Classification Number:TF845.6[冶金工程]

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Aiming at the problems of low recovery rate of high-value rare earth elements praseodymium and neodymium,long process and high consumption of auxiliary materials in the current mainstream leaching process of bastnaesite,a new complex leaching technology of bastnaesite with sulfuric acid as the complexing agent was proposed,greatly simplifying the leaching process and realizing the synergistic efficient leaching of F^-and rare earth in hydrochloric acid system.The effects of complexing agent types and dosages,acid-ore volume-mass ratio,leaching temperature,leaching time and liquid-solid volume-mass ratio on the rare earth leaching rate were systematically investigated.The obtained optimum process conditions are as follows:complexing agent is sulfuric acid,sulfuric acid dosage is 1%of the mass of bastnaesite roasted ore,acid-ore volume-mass ratio is 1.1 mL/g,leaching temperature is 25℃,liquid-solid volume-mass ratio is 4 mL/g and leaching time is 3 h.Under these conditions,the leaching rate of praseodymium and neodymium increases from 94.51%of the current process to 96.23%.