Recovery of light and heavy rare earth elements from apatite ore using sulphuric acid leaching, solvent extraction and precipitation
Recovery of light and heavy rare earth elements from apatite ore using sulphuric acid leaching, solvent extraction and precipitation
复制标题
利用硫酸浸出、溶剂萃取及沉淀法从磷灰石矿中回收轻、重稀土元素
DOI：
10.1016/j.hydromet.2018.05.024
复制
发表时间：
2018-08-01
期刊：
影响因子：
4.7
通讯作者：
Shibayama, Atsushi
中科院分区：
文献类型：
--
作者：
Battsengel, Ariuntuya;Batnasan, Altansukh;Shibayama, Atsushi
磷灰石是稀土元素（REE）的重要宿主矿物之一。与其他主要矿物（如独居石、氟碳铈矿和磷钇矿）相比，稀土元素从磷灰石中的分离尚未得到广泛研究。因此，有必要开发一种从磷灰石矿石中回收稀土元素的有效方法。本文介绍了通过硫酸浸出、溶剂萃取和沉淀工艺从磷灰石矿石样品中回收稀土元素的实验室研究结果。结果表明，在 20 摄氏度的稀硫酸溶液 (1 M H2SO4) 下，一小时内可以最有效地溶解磷灰石矿石样品中的轻稀土元素 (> 85%) 和重稀土元素 (>89%)。使用 1.2 M 二-(2-乙基己基)磷酸 (D2EHPA) 作为阳离子交换剂，几乎完全萃取富浸液中存在的重 REE，而大多数轻 REE 仍保留在萃余液中。加载到有机相中的重稀土元素被 3 M H2SO4 溶液完全反萃取。通过添加 0.08 M 草酸，保留在萃余液中并汽提到水溶液中的 REE 以 RE 草酸盐的形式沉淀出来。
Apatite is one of the important host minerals of the rare earth elements (REEs). Separation of REEs from apatite has not been studied extensively compared with other main minerals such as monazite, bastnasite and xenotime. Therefore, it is essential to develop an effective method for recovery of REEs from apatite-based ores. This paper presents the results of laboratory studies for the recovery of rare earth elements from an apatite ore sample by using sulphuric acid leaching, solvent extraction, and precipitation processes. Results showed that the most effective dissolutions of light REEs (> 85%) and heavy REEs (>89%) from the apatite ore sample were achieved with a dilute sulphuric acid solution (1 M H2SO4) at a temperature of 20 degrees C in an hour. The heavy REEs present in the pregnant leach solution were almost entirely extracted using 1.2 M di-(2-ethylhexyl) phosphoric acid (D2EHPA) as a cation exchanger, while the most light REEs remained in the raffinate. The heavy REEs loaded into the organic phase were stripped completely by 3 M H2SO4 solution. REEs remained in raffinate and stripped into the aqueous solution were precipitated as RE oxalates by the addition of 0.08 M oxalic acid.