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Mixed rare earth concentrate leaching with HCl–AlCl3 solution

Authors :
Liu Zhaogang
Yang Jianping
Mei Li
Zhang Xiaowei
Mitang Wang
Liu Jia
Source :
Rare Metals. 32(3):312-317
Publisher :
Springer Nature

Abstract

A method of Baotou mixed rare earth concentrate 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−1, reaction temperature is 85 °C, reaction time is 90 min, 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 concentrate 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.

Details

Language :
English
ISSN :
10010521
Volume :
32
Issue :
3
Database :
OpenAIRE
Journal :
Rare Metals
Accession number :
edsair.doi.dedup.....d5214160855933332a5025650fa7270b
Full Text :
https://doi.org/10.1007/s12598-013-0034-0