Comparative Study on Extraction Properties of TBP and N523 on H3BO3 and HCl
In this paper,the extraction performance of neutral lithium phosphate extractant(TBP)and amide-based lithium extractant(N523)for H3BO3 and HCl was systematically investigated.The two extract-ants mentioned above were mainly applied to the study of lithium extraction from brines with high Mg/Li ra-tio.The results showed that the extraction ability of TBP for H3BO3was much stronger than that of N523,and the structure of the complex formed by TBP and H3BO3 was H3BO3-2TBP.MgCl2 has a significant salting-out effect on the extraction of boric acid by TBP and N523.The extraction ability of N523 for HCl was stronger than that of TBP,and MgCl2 and LiCl had a significant salting-out effect on HCl extraction by both TBP and N523.The results of the study can provide some theoretical guidance for the subsequent opti-mization of the process conditions of lithium extraction from boron-containing brines using these two types of lithium extractants.
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