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Separation and recovery of associated rare earths from the Zhijin phosphorite using hydrochloric acid

Journal of Rare Earths 2019年第4期37卷 443-450页

作者： Dengpan Nie An Xue Mingyang Zhu Yu Zhang Jianxin Cao College of Resource and Environmental Engineering Guizhou University School of Chemical Engineering Guizhou Minzu University Guizhou Institute of Metallurgical and Chemical Engineering School of Chemistry and Chemical Engineering Guizhou University

The separation and extraction of associated rare earths from the Zhijin phosphorite mine is of great interest. Based on previous studies, the hydrolysis of phosphate ore using hydrochloric acid was systematically studied through extensive testing. Experiments were conducted to separate and recover the rare earths from the hydrolysis solution. Kinetic studies on the acidolysis of phosphorite using hydrochloric acid show that the use of hydrochloric acid in the acidolysis of phosphorite is mainly controlled by a chemical reaction and is also a diffusion-controlled reaction. When 210 L of HCL per 100 kg of phosphorite was used at 30 ℃ for 360 min, 96.1% of the P_2 O_5 and 95.0% of the rare earths are leached from the phosphorite. After defluorination and purification, the pH of the phosphate-acid solution is adjusted to 2.1 using sodium hydroxide, and a rare earth concentrate with rare earth content of 1.76 wt%is obtained; i.e., 90.1% of the rare earths are recovered. The rare earth content is increased to more than5 wt% through multiple enrichment processes, with a total yield of 59.5%.

关键词： Zhijin phosphorite mine Rare earths Leaching Separation Recovery

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