Basic study on the extraction and its kinetics of Rb and Cs from waste solution obtained by lithium recovery
Rb and Cs were simultaneously extracted from a waste solution resulting from the recovery of lithium by the t-BAMBP and liquid paraffin system,and the extraction kinetics were analyzed.The effect of waste solution alkalinity,temperature,phase ratio and other factors on extraction rate was studied.Under the conditions of c(OH-)of 0.4 mol/L,t-BAMBP volume fraction of 35%,phase ratio(VO/VA)of 1.2,extraction temperature of 25℃,extraction time of 2 min,and oscillation speed of 180 r/min,extraction rates of Rb+and Cs+reached 68.22%and 97.57%,respectively.Under the same condition,the extraction rates of Rb+and Cs+reached 96.06%and 99.96%using a three-stage countercurrent extraction.The loaded organic phase after two-stage scrubbing and two-stage stripping,the results showed that the majority of Li+,Na+and K+were removed in the scrubbing stage,while Rb+kept a lower scrubbing rate and Cs+was not scrubbed.99.15%of Rb+and 99.98%of Cs+were effectively stripped.Extraction kinetic analysis of Rb showed that the apparent activation energy of Rb+extraction was-11.48 kJ/mol,with the conclusion that mass transfer was controlled by diffusion and chemical reaction mixing.
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