Dissolution behaviors of rare earth elements in phosphoric acid solutions
Dissolution behaviors of rare earth elements in phosphoric acid solutions
复制标题
稀土元素在磷酸溶液中的溶解行为
DOI：
10.1016/s1003-6326(18)64883-6
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发表时间：
2018-11-01
影响因子：
4.5
通讯作者：
Zhang, Li-feng
中科院分区：
文献类型：
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作者：
Wu, Sheng-xi;Zhao, Long-sheng;Zhang, Li-feng
为了为从磷酸中回收稀土元素提供实用的基础数据，更好地了解稀土元素在磷酸蒸发过程中的行为，测定了不同温度下不同浓度磷对磷酸中稀土元素的溶解度。建立了稀土元素溶解度与磷酸浓度之间的简单线性模型，实验数据与模型拟合良好（R-2>0.94）。氢离子浓度是控制稀土在磷酸中的溶解度的主要因素。此外，稀土在磷酸中的溶解度随温度升高而急剧下降，这可能是由于REEPO4溶解反应的吉布斯能升高或温度升高抑制了磷酸分子的解离。
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 (R-2>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.