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Vol.38, No.6, 851 ~ 857, 2000

Title

Pesearch Paper / Hydrometallurgy : A Study on the Solvent Extraction of Indium with D2EHPA

김성규Sung Gyu Kim,이화영Hwa Young Lee

Abstract

The extraction characteristic and stoichiometric relation for the solvent extraction of indium from acid solution was studied with D2EHPA(di-2-ethylhexyl phosphoric acid). The results showed that the extraction efficiency of indium increased with increasing pH of solution and D2EHPA concentration at the same pH condition. Also the extraction aspect and efficiency of indium in the HCI solution were similar to that in the sulfuric acid solution. The presence of SO^(2-)₄ and NO₃ would not affect the extraction of indium while Cl^- caused considerably the lowering of the indium extraction resulting from the formation of ligand complexes between Cl^- and indium in the solution. Generally, the optimum conditions for the extraction of indium appeared to be above 0.36M/L [R₂H₂] of D2EHPA and pH 0. On the other hand, the indium was extracted by non-solvated form like [InR₃] with D2EHPA and the extracted species were not associated with each other. The extraction relation would be as follows : [In^(3+)]_(aq) + 3/2[R₂H₂]_(org) = [InR₃]_(org) + 3[H^+]_(aq). The equilibrium constant for the reaction was found to be 12.531.

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