Mixed rare earth concentrate leaching with HCl-AlCl_3 solution  

作　　者：Mei Li Xiao-Wei Zhang Zhao-Gang Liu Mi-Tang Wang Jia Liu Jian-Ping Yang 

机构地区：[1]College of Materials Science and Engineering, Beijing University of Chemical Technology [2]School of Material and Metallurgy, Inner Mongolia Science and Technology University, Key Laboratory of Inner Mongolia New Technologies of Modern Metallurgy and Application of Rare

出　　处：《Rare Metals》2013年第3期312-317,共6页稀有金属（英文版）

基　　金：financially supported by the National Nature Science Foundation of China (No. 51174115);National Outstanding Youth Science Foundation of China (No. 51025416);Program for Changjiang Scholars and Innovative Research Team in University (No. IRT1065)

摘　　要：Abstract A method of Baotou mixed rare earth concen- trate leaching was investigated. According to the principle of complex leaching, the quadratic orthogonal regression experiment was used to investigate effect of six factors. An optimal condition of low energy and environment friendly was determined as follows： HCl acidity is 4 mol.L-1, AlCl3 concentration is 2 mol.L-l, reaction temperature is 85 ℃, reaction time is 90 rain, liquid to solid ratio is 35 ml.g-1, and stirring speed is 100 r.min-1. According to this condition, the leaching ratio of mixed rare earth con- centrate is 76.5 %. The analyses of X-ray diffraction shows that bastnasite disappears, and the main peaks of filter residue is monazite and cheralite after leaching of HCl- AlCl3 solution. The result indicates that REFCO3 of the mixed rare earth concentrate can be dissolved, but REPO4 remains in the leaching residue. This method provides a way to separate and extract rare earth.Abstract A method of Baotou mixed rare earth concen- trate leaching was investigated. According to the principle of complex leaching, the quadratic orthogonal regression experiment was used to investigate effect of six factors. An optimal condition of low energy and environment friendly was determined as follows： HCl acidity is 4 mol.L-1, AlCl3 concentration is 2 mol.L-l, reaction temperature is 85 ℃, reaction time is 90 rain, liquid to solid ratio is 35 ml.g-1, and stirring speed is 100 r.min-1. According to this condition, the leaching ratio of mixed rare earth con- centrate is 76.5 %. The analyses of X-ray diffraction shows that bastnasite disappears, and the main peaks of filter residue is monazite and cheralite after leaching of HCl- AlCl3 solution. The result indicates that REFCO3 of the mixed rare earth concentrate can be dissolved, but REPO4 remains in the leaching residue. This method provides a way to separate and extract rare earth.

关 键 词：HCl-AlCl3 solution Mixed rare earthconcentrate LEACHING 

分 类 号：TF845[冶金工程—有色金属冶金]