C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 58/00 (2006.01) C22B 3/06 (2006.01) C22B 3/12 (2006.01) C22B 3/44 (2006.01) C25C 1/16 (2006.01)
Patent
CA 2295468
An object of the present invention is to make it possible to recover gallium and indium efficiently and at a low cost from solutions containing traces of gallium and indium. Jarosite is produced by performing a specific treatment on a solution obtained by a two-stage neutralization treatment during the zinc leached residue treatment step of wet zinc refining, or on another solution containing traces of gallium and indium; the gallium and indium are separated and concentrated; an alkali is added to the jarosite; and the gallium is separated and concentrated by leaching. Calcium hydroxide or magnesium hydroxide is optionally added to the jarosite leached solution to perform purifying, sulfuric acid is added to the purified solution. neutralization is performed, basic gallium sulfate is precipitated, the precipitate is subjected to alkali leaching, and the gallium in the leached solution is electrolytically extracted, yielding metallic gallium.
Kudo Yoshito
Maruyama Yukiko
Dennison Associates
Dowa Mining Co. Ltd.
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