锂云母酸浸液萃取除杂

锂云母酸法浸出液含有大量杂质金属，使用传统化学沉淀法会引起大量产物损失。为了降低浸出液除杂过程中的产物损失，使用溶剂萃取法进行萃取除杂工艺研究。通过对不同萃取剂组合萃取除杂效果的研究，确定使用P204作为萃取剂。考察了萃取过程中不同因素的影响，并使用H2O2预氧化水相里的Fe2+，强化萃取效果。结果表明：在有机相组成为30%P204+70%磺化煤油、料液初始pH为2.4、相比O/A=1、萃取时间10min和振荡频率300 r/min的单级萃取最佳条件下，铁除杂率为99.89%、铝除杂率为31.23%、锂和铷的萃取率分别为7.63%和14.85%。相比于化学沉淀法，锂和铷的回收率得到了30%左右的提高。

Solvent Extraction for Impurity Removal in Acid Leaching from Lepidolite

The acid leaching solutions from lepidolite usually contains a large amount of impurity metal, and the traditional chemical precipitation method will cause a problem of product loss. In order to reduce the product loss in the process of impurity removal, solvent extraction method was used to study the extraction process of impurity removal. Through the study of the extraction effect of various extractant combinations, P204 has the best extraction efficiency and was selected as extractant. The effects of relevant factors on extraction were investigated, and H2O2 was used to pre-oxidize Fe2+ in water phase to strengthen the extraction effect. The results show that the extraction rate of Fe, Al, Li and Rb is 99.89%, 31.23%, 7.63% and 14.85%, respectively, under the optimum conditions including the organic phase of 30% P204 + 70% sulfonated kerosene, initial pH value of feed liquid of 2.4, O/A=1, extraction time of 10min, and oscillation frequency of 300 r/min. Compared with the chemical precipitation method, the recovery rate of Li and Rb has been improved by about 30%.