Extraction Characteristic and Stoichiometric Relation of Indium with Versatic Acid-10

摘要

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 deg C, 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)R_2 centre dot 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(R_2H_2)_(org) = (In(OH)R_2 centre dot + 2(H~+)_(aq), Kc = 3.31 X 10~(-6) at 18 deg C.