Dowa Mining Co., Ltd.

Unitika Ltd.

Akita Zinc Co., Ltd.

Kunio Sekine

Masahide Hirai

Hitoshi Masuda

Kozo Kondo

Shozo Tomoshige

Yukio Kamata

Sachio Kamata

Yoshio Yamaishi

Kodo Ishibashi

A novel method is disclosed which enables gallium and/or indium to be selectively separated and concentrated from a solution containing them in very low concentrations together with many other metal ions in rather high concentrations. The solution is passed through a bed of a chelating ion exchange resin having an amino carboxylic acid group either immediately or after the pH adjustment. Gallium and/or indium adsorbed on the chelate resin is desorbed by eluting with a mineral acid. The eluate, after the pH adjustment, is passed through another bed of a chelating ion exchange resin having an amino carboxylic acid group, and the resin is treated with a mineral acid to elute the metal ions adsorbed on the resin to thereby recover gallium and/or indium in the form of a concentrated solution.

Method of selective separation and concentration of gallium and/or

Apparatus for polishing metal electrolytic refining cathode plates, in which cathode plates are transported individually by means of a series of transferring and hanging devices, with the cathode plates thus transferred being polished in a polishing mechanism while moved vertically and while their dielectric frame supporters are protected so as not to be subjected to the polishing operation effected by the polishing mechanism.

Apparatus for polishing cathode plates for metal electrolytic refinery

The present invention is particularly directed to the structure and arrangement of the cathode holder which includes a tapered surface for producing an upturned edge portion on the metal which is deposited on the cathode plate to facilitate stripping of the metal from the plate. An enlarged portion of the holder permits engagement thereof to enable smooth pivotal motion of the holder relative to the plate so that the holder may be readily oriented with respect to the plate and, therefore, used repeatedly.

Automatic apparatus for stripping deposited metal from a cathode plate

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Akita, Japan

Kunio Sekine