Dissolution behaviors of rare earth elements in phosphoric acid solutions

In order to provide practical fundamental data for rare-earth elements (REEs) recovery from phosphoric acid and to better understand REEs behavior during the phosphoric acid evaporation process, the solubilities of REEs in phosphoric acid with various concentrations of phosphorus at different temper...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2018-11, Vol.28 (11), p.2375-2382
Main Authors: WU, Sheng-xi, ZHAO, Long-sheng, WANG, Liang-shi, HUANG, Xiao-wei, DONG, Jin-shi, FENG, Zong-yu, CUI, Da-li, ZHANG, Li-feng
Format: Article
Language:English
Subjects:
dissolution behavior
phosphoric acid
rare earth elements
rare earth phosphates
temperature
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Summary:In order to provide practical fundamental data for rare-earth elements (REEs) recovery from phosphoric acid and to better understand REEs behavior during the phosphoric acid evaporation process, the solubilities of REEs in phosphoric acid with various concentrations of phosphorus at different temperatures were measured. A simple linear model between REEs solubility and phosphoric acid concentration is built and the experimental data are found to fit it very well (R2>0.94). Hydrogen-ion concentration is found to be the predominant factor controlling the solubility of REEs in phosphoric acid. In addition, the solubility of REEs in phosphoric acid is found to sharply decrease with increasing temperature, which can be attributed to the increase of the Gibbs energy of the REEPO4 dissolution reaction or the restraint of the disassociation of phosphoric acid molecules owing to the elevated temperature.
ISSN:1003-6326
DOI:10.1016/S1003-6326(18)64883-6