Separation of Pt(IV) and Rh(III) from Chloride Solution by Solvent Extraction with Amine and Neutral Extractants

摘要

Solvent extraction experiments were performed to separate platinum and rhodium from mixed chloride solution by using amine and neutral extractants. Effects of extraction conditions on the separation of the two metals were investigated as a function of extractant concentration in the HC1 concentration range from 1 to 9 mol/dm~3. Alamine304-1, Alamine308, Alamine336, Aliquat336, TBP, TOPO and DOS were tested in our study. The concentration of Pt(IV) and Rh(III) in the mixed solution was fixed at 0.001 mol/dm~3 and 0.0001 mol/dm~3, respectively. In the extraction with amine, Pt was completely extracted irrespective of HC1 concentration, while the extraction percentage of Rh depended on extraction condition. In the extraction with neutral extractants, the extraction percentage of Rh was nearly zero whereas 1 mol/dm~3 TOPO completely extracted most of Pt in our experimental range. Separation of Pt from Rh by amines except Alamine336 was possible only from 9 mol/dm~3 HC1 solution, while complete separation of the two metals by TOPO was possible in the HC1 concentration range from 1 to 9 mol/dm~3. From the consideration of the economics of the separation process, our results indicate that TBP is better than TOPO in separating Pt and Rli from chloride solution.