广东某稀土浸出试验与除杂化学分析

Leaching Test and Impurity Removal of Rare Earth

某稀土中TREO离子相含量0.1%,采用硫酸铵作浸出剂从浸出剂浓度、淋洗液固比和淋浸速度,做了相关的条件试验,并得出最佳浸出条件,同时针对稀土浸出液除杂问题从离子浓度层面做了相关的化学分析,在淋出液稀土浓度1.10 g/L,pH=4.21左右,杂质主要是Al_2O_3,含量0.42 g/L,试验既要满足使用碳酸氢铵有效的去除Al_2O_3,又能尽量减少碳酸稀土的沉淀而造成稀土的损失,通过溶液化学分析得到了最佳的除杂pH值为5.0,最终稀土沉淀作业回收率最高为99.706%的优良指标。

The ion phase content of TREO in a certain rare earth was 0.1%, and the relevant conditional test were carried on from aspects of leaching agent concentration, solid-liquid ratio leaching and leaching rate by using ammonium sulfate as leaching agent, obtaining the best leaching condition and make the relevant chemical analysis of impurity for the rare earth leaching agent from the layer of lon concentration simultaneously. In the condition of the leaching solution rare earth concentration by 1.10 g/L, pH = 4.21 or so, the main impurity is Al_2O_3 by the content of 0.42 g/L, the test should not only meet the effective removal of Al_2O_3 by ammonium bicarbonate, but also to minimize the loss of rare earth caused by the precipitation of carbonate rare earth. The results showed that the optimum pH value was 5.0, and the recovery rate of rare earth precipitation was 99.706%.