关键词: 磷酸三丁酯, 萃取, 卤水提锂

Abstract: With tri-butyl-phosphate (TBP) as extraction reagent,sulfonated kerosene as dilution reagent，and FeCl₃•6H₂O as co-extraction reagent to extract lithium from the salt lake brines which have been separated from potassium.Effects of different factors on the extraction rate were studied.Results showed that the sequence of phase ratio (O/A)＞amount-of-substance ratio of iron to lithium＞TBP content (volume fraction).The optimum conditions in lithium extraction process which obtained from single factor experiments and orthogonal test analysis were as follows:V(TBP)=80%,phase ratio (O/A) was 2.0,n(Fe)∶n(Li)=1.5,c(H⁺)=0.05 mol/L,and shaking time was 5 min.Under the optimal conditions,the extraction efficiency of this process was high and the single-stage extraction rate reached 91.4%.The process is so stable and repeatable that it can provide a reliable reference for the expansion of industrial production.

Key words: tri-butyl-phosphate, extraction, lithium extraction in brine