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文獻(xiàn)名：Enrichment of rare earths in magnesium sulfate leach solutions of ion-absorbed ores by extraction-precipitation
作者：Xiang Suabc, Yanliang Wangab, Jia Suabc, Wei Laiac, Yun Gaoa, Xiaoqi Sunacd
aCAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China
bUniversity of Chinese Academy of Sciences, Beijing 100039, PR China
cFujian Research Center for Rare Earth Engineering Technology, Xiamen Institute of Rare Earth Materials, Haixi Institute, Chinese Academy of Sciences, Xiamen 361021, PR China
dGanzhou Rare Earth Group Co., Ltd., China Southern Rare Earth, Ganzhou 341000, PR China
摘要：Magnesium sulfate (MgSO4), a leaching agent for ion-absorption rare earth (RE) ores, can reduce the production of ammonia nitrogen wastewater and supply magnesium (Mg) for soil. Three novel solid extractants, i.e., 2,2′-(1,4-phenylenebis(oxy))dioctanoic acid (PPBOA), 2,2′-(1,2-phenylenebis(oxy))dioctanoic acid (OPBOA) and 2,2′-(1,3-phenylenebis(oxy))dioctanoic acid (MPBOA) were synthesized and used to enrich RE by extraction-precipitation strategy, which showed better selectivity and faster equilibrium. The precipitation rates of PPBOA, OPBOA and MPBOA on RE could reach 95.1%, 93.5% and 96.7% at the large liquid/solid phase ratio (450/1). Meanwhile, the purities of RE in the stripping solutions reached 96.1?wt%, 94.1?wt% and 96.2?wt%. Chemical oxygen demand (COD) values of raffinates from OPBOA and MPBOA were 56?mg/L and 69?mg/L, being lower than that of China national emission standard (100?mg/L). The concentration of enriched RE solution by MPBOA was 238.0?g/L, solid extractant and MgSO4 raffinate could be recycled.
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