| The extraction characteristic and stoichiometric relation for the solvent extraction of indium from sulfuric acid solution was studied with Versatic Acid-10. The results showed that the extraction efficiency of indium increased with increasing pH of solution and concentration of Versatic Acid-10 as extractant. And, up to 45℃, the higher reaction temperature was, the more indium was extracted. On the other hand, the indium was extracted by solvated organo-metal compound with one molecule of the Versatic Acid-10 monomer like [In(OH)R₂·RH] and the extracted species were not associated with each other. The extraction relation and equilibrium constant would be as follows : [In(OH)^(2+)]_(aq)+3/2[R₂H₂]_(org)=[In(OH)R₂·RH]_(org)+2[H^+]_(aq), Kc=3.31×10^(-6) at 18℃. |
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