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研究了一种新型酸性磷类萃取剂NA萃取中重混合稀土的性能,探讨了萃取过程中有机相的皂化度、有机相组成、混合稀土料液中杂质含量、料液初始p H对新型萃取剂萃取饱和容量的影响以及反萃过程中反萃酸度对反萃性能的影响,同时还探讨了新型萃取剂的损耗率。试验结果表明,控制混合稀土料液浓度与铝浓度比≥222,与铁浓度比≥2543、有机相的皂化度0.64~0.68 mol·L~(-1)、有机相中磺化煤油∶新型萃取剂=1∶1(新型萃取剂浓度为1.45 mol·L~(-1))及混合稀土料液初始p H=1.2的工艺条件下,萃取过程分相效果好,新型萃取剂的饱和容量大于0.20 mol·L~(-1),比传统萃取剂P507的最佳萃取饱和容量高15%~20%左右,新型萃取剂的损耗率为0.42%~0.45%;反萃过程,采用盐酸作为反萃剂,只要控制盐酸浓度为3.0 mol·L~(-1)时,负载有机相的单级反萃率即可达到98%以上;研究结果表明,该新型萃取剂,具有萃取饱和容量大、溶解损失少、循环使用性能好、反萃酸度低的特点,可以大大降低槽体有机积存量、稀土积存量和酸耗量,减少投资成本,改善工作环境,具有广泛的应用前景。
In this paper, the properties of rare earth mixed with NA, a novel acidic phosphorus extractant NA, were studied. The degree of saponification, organic phase composition, impurity content in mixed rare earth solution, The influence of solvent extraction saturation capacity and the effect of stripping acidity on stripping performance in stripping process were studied. The loss rate of new extractant was also discussed. The results showed that the ratio of concentration of mixed rare earth to aluminum was ≥222, the concentration of iron was ≥2543, the degree of saponification of organic phase was 0.64 ~ 0.68 mol·L ~ (-1), sulfonated kerosene in organic phase: Agent = 1: 1 (the new extractant concentration was 1.45 mol·L -1) and the initial p H = 1.2 of the mixed rare earth material, the phase separation effect of the extraction process is good. The saturation capacity of the new extractant is greater than 0.20mol·L -1, which is about 15% ~ 20% higher than that of the traditional extractant P507. The loss rate of the new extractant is 0.42% -0.45%. The stripping process uses hydrochloric acid as the As long as the concentration of hydrochloric acid is controlled to 3.0 mol·L -1, the single-stage stripping efficiency of the organic phase can reach more than 98%. The results show that the new extractive agent has the advantages of large extraction saturation capacity, Low dissolution loss, good recycling performance and low stripping acidity, which can greatly reduce organic accumulation, rare earth accumulation and acid consumption in the tank, reduce the investment cost and improve the working environment, and has broad application prospects.