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采用溶剂萃取的方法,对从废旧镍氢电池酸浸液中选择性提取稀土进行了探索。实验探索出合适的萃取体系,研究了料液初始pH值、萃取温度、混合强度、萃取时间、萃取相比等因素对萃取效果的影响,考察了反萃剂组成、浓度、反萃相比等因素对反萃效果的影响,并测出稀土的萃取等温线。在此基础上进行了工厂扩大试验,结果表明:经5级逆流萃取,稀土的萃取率可达99.99%。混合反萃液经草酸沉淀,得到的稀土纯度为98.49%,杂质金属含量均小于0.05%。所选萃取有机相对稀土有良好的选择性,可实现稀土与其他元素的分离。
The method of solvent extraction was used to explore the selective extraction of rare earth from the acid leaching solution of waste Ni-MH battery. Experiments to explore the appropriate extraction system, the initial pH value of the feed solution, extraction temperature, mixing intensity, extraction time, the extraction compared to other factors on the extraction effect, the stripping agent composition, concentration, stripping ratio Factors on the stripping effect, and measured rare earth extraction isotherms. On the basis of this, a factory expansion test was carried out. The results showed that the extraction rate of rare earth reached 99.99% after 5-stage countercurrent extraction. The mixed stripping solution was precipitated by oxalic acid, the purity of the obtained rare earth was 98.49%, the impurity metal content was less than 0.05%. Selected organic extraction of organic Rare Earth has a good selectivity, can achieve the separation of rare earth and other elements.