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Effect of anions on the solubility of rare earth element-bearing minerals in acids

机译：阴离子对稀土元素耐矿物溶解度的影响

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摘要

The effect of anions such as sulfate, chloride and nitrate on the solubility of rare earth element (REE)-bearing phosphates and fluoro-carbonates was examined using relevant thermodynamic data. The study found that these anions have significant influences on the overall dissolution of REEs from various sources in the aqueous media. The thermodynamic calculations in this study indicated that the speciation of REEs with the anions tends to increase the overall solubility of the REE-bearing minerals. The study also suggested that proper use of the anions may cut down on the use of acids significantly while maintaining the same or better recovery of valued metals. This offers a positive economic impact on the process and also provides environmental benefits in the post-leaching treatments. However, in some cases, strong precipitation of REEs with some of these anions causes an adverse effect on the solubility of these elements. It has been found that sulfate ion has the most pronounced effect on the solubility compared to nitrate and chloride, in which the latter two acids exhibited almost identical results.
机译：使用相关的热力学数据检查硫酸盐，氯化物和硝酸盐等硫酸盐，氯化物和硝酸盐对稀土元素（REE）的溶解度的影响。该研究发现，这些阴离子对水性介质中各种来源的REES总体溶解的显着影响。本研究中的热力学计算表明，带阴离子的REES的形态倾向于增加携带戒指的矿物的总溶解度。该研究还表明，对阴离子的适当使用可能会显着地削减酸的使用，同时保持相同或更好地恢复值的金属。这对该过程产生了积极的经济影响，并在浸出后处理中提供了环境效益。然而，在某些情况下，具有一些这些阴离子的REES的强烈沉淀导致对这些元素的溶解性产生不利影响。已经发现，与硝酸盐和氯化物相比，硫酸根离子对溶解度最明显的影响，其中后两种酸表现出几乎相同的结果。

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