PROCÉDÉ DE TRAITEMENT DE PARTICULES MINÉRALES DE TERRES RARES CONTENANT DU FLUOR

摘要

The present disclosure discloses a method for treating fluorine-containing rare earth mineral particles, comprising the following steps: (1) mixing the first batch of fluorine-containing rare earth mineral particles with the first sulfuric acid solution according to the weight ratio of 2-10:1 of the sulfuric acid in the first sulfuric acid solution to the first batch of fluorine-containing rare earth mineral particles, and then heating the mixture for liquid-solid reaction, condensing and absorbing steam through a tail gas system, wherein a sulfuric acid concentration of the first sulfuric acid solution is 40-85wt%; (2) after the reaction, separating solid phase and liquid phase to obtain acid filtrate and acid residue; (3) leaching the acid residue with water to obtain aqueous leaching liquor of rare earth sulfate and aqueous leaching residue; (4) adding the second sulfuric acid solution to the acid filtrate so that the sulfuric acid concentration of the acid filtrate is 40-85wt%; and then circularly executing the steps (1) - (3) for treating the i