Recovery of rare earths from acid leach solutions of spent nickel-metal hydride batteries using solvent extraction
Recovery of rare earths from acid leach solutions of spent nickel-metal hydride batteries using solvent extraction作者机构：School of Metallurgy and Environment Central South University Key Laboratory of Hunan Province for Metallurgy and Material Processing of Rare Metals
出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)
年 卷 期：2015年第33卷第12期
页 面：1348-1354页
核心收录：
学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 080603[工学-有色金属冶金] 08[工学] 0806[工学-冶金工程]
基 金：supported by the National Natural Science Foundation of China(51404297)
主 题：rare earths spent nickel-metal hydride battery recovery solvent extraction
摘 要：The extraction of rare earths from acid leach solutions of spent nickel-metal hydride batteries using a primary amine ex- tractant of N 1923 was studied. The effects of feed pH, temperature, agitation rate and time on the extraction of rare earths, as well as stripping agent composition and concentration, phase ratio on the stripping were investigated. In addition, the extraction isotherm was determined. The pilot plant test results showed that the extraction of rare earths reached 99.98% after a five-stage counter current extraction. The mixed rare earths oxalates with the 99.77% purity of rare earth elements and impurity content less than 0.05% were obtained by the addition of oxalic acids in loaded strip liquors. The extractant exhibited good selectivity of rare earths over base metals of iron, nickel, copper and manganese.
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