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    锂低硅铝比沸石交换母液中锂离子的回收Ⅰ——萃取工艺研究

    Recovery of Lithium Ion From Exchanged Mother Liquids of Li-LSX Zeolite-Part 1: Research on the Extraction Process

      摘要
    • 摘要: 以磷酸三丁酯(TBP)和200#溶剂油的混合溶液为萃取剂,在协萃剂FeCl3的作用下,对Li-LSX分子筛交换后母液中的Li+(0.04 mol/L)进行了回收考察,系统研究了萃取时间、油水相比、酸度、温度、萃取剂浓度以及铁锂比和MgCl2浓度等因素对萃取过程的影响规律.结果表明,TBP对Li+有很好的萃取效果,萃取率可达到85%以上.最佳萃取条件为:c(Fe3+)/c(Li+)为4,c(MgCl2)为3~4 mol/L,TBP体积分数为40%~60%,温度为室温,萃取时间为10~15 min、pH值为2~3、油水相比为1∶1.

       

      Abstract: In order to recover Lithium ion from exchanged mother liquids of Li-LSX zeolite,an extraction method of lithium ion by use of tri-n-butyl phosphate(TPB) with 200# gasoline as mixed solvent was investigated in the presence of ferric chloride as cooperation agent.Effects of procedure parameters,such as contact time,phase ratio,hydrochloric acid acidity,temperature,concentration of extractant,the ratio of c(Fe3+) /c(Li+) and concentration of MgCl2,on the extraction technology were analyzed in details.The results show that TBP solvent is a very suitable extractant to lithium ion and the extraction rate can reach up to 85%.The optimal extraction conditions at room temperature are found as the following: c(Fe3+) /c(Li+) ratio is around 4;concentration of MgCl2 solution is 3~4 mol/L.TBP volume fraction is 40~60%.Contact time is during the period of 10~15 min.pH value is around 2~3.And phase ratio is about 1∶1.

       

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