Process for the recovery of indium and tin

Details Process for the recovery of indium and tin Process for the recovery of indium and tin

C - Chemistry, Metallurgy

22

B

53/167, 53/172,

C22B 58/00 (2006.01) C01G 19/00 (2006.01) C22B 7/02 (2006.01) C22B 25/06 (2006.01)

Patent

CA 1214045

ABSTRACT A process for the separate recovery of indium and tin from indium- and tin-bearing materials chosen from fumes, electrolytic slimes and flue dusts which process comprises the steps of leaching said materials in oxidic or sulfatic form with a solution of caustic in a caustic leach; subjecting the leach residue to a fusion with solid caustic; leaching the fusion product with water; recovering the water leach residue as an indium concentrate; treating the water leach solution with calcium hydroxide; and recovering a concentrate containing tin as calcium hexa-hydroxo stannate. This process has the advan- tage of being simpler and yielding higher recoveries of indium and tin than most processes proposed hithero. Materials not in oxidic or sulfatic form may be converted by a fuming operation.

428089

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