Stripping Gold from TBP-CTMAB-C_(12)H_(26) Gold-Loaded Organic Phase with SBH and Tu;

The effect of extraction systems,concentration of N_(235) and initial pH on the extraction of iron(Ⅲ),as well as the effect of volume ratio of organic to aqueous(V_(org)/V_(aq)),concentration of sulfuric acid and equilibrium pH on the stripping of iron(Ⅲ) in loaded organic phase were studied.

Both extraction and concentration of L-phenylalanine(L-phe) were carried out using gravity separation phase liquid membrane(GSPLM) with P 204 as carrier and H 2SO 4 as stripping agent.

The back extraction of UO 2 2+ ,Pu(Ⅳ),Am 3+ and TcO 4 - with 2 hydroxyethyl 1,1 diphosphonic acid (HEDPA) solution from 30 % TRPO(mixed trialkyl phosphine oxide)/ kerosene and 20 %TRPO 20 %TBP(tributyl phosphate)/kerosene systems is studied.

The back extraction of Am 3+ ,Pu(IV),UO 2+ 2 and TcO - 4 with high concentration nitric acid, oxalic acid, sodium carbonate, ammonium carbonate respectively from different 30% TRPO/kerosene systems are studied.

The back-extraction speed is one degree for either copper concentration in organic phase or hydrogen ion concentration.

In recent years,the extraction characteristics of Cr(Ⅲ)with the acidic organophosphate extractants have been studied,while the researches on the back-extraction of Cr(Ⅲ)were seldom reported.

Experiments were carried out to find out the effect of different operation conditions on the reverse extraction.