<Original Papers>Recovery of Indium and Gallium by Solvent Extraction

A method of recovery of indium and gallium from the flue dust, slag or extraction residues produced from the smelting of nonferrous metals, is presented. A problem arises as to the separation of indum and gallium from the lead, zinc, copper, iron, tin, antimony and arsenic coexisting in large quantities. The results of an attempt to separate and recover them by the solvent extraction are given. Indium and gallium were extracted by ether from the hydrobromic solution. Oxine was used for separating tin, antimony from indium. It was possible to use hydrobromic acid and oxine repeatedly. The recovery of indium from synthetic specimens was 95% and that of gallium was 93%. Examination was further made of the recovery of indium and gallium from the practical flue dust. Results of experiments are discussed