PURPOSE: To economically manufacture metallic Ga by a simple process by removing impurities such as V and P from a sodium aluminate soln. separated in an Al(OH)3 depositing stage and by electrolyzing the soln. after oxidation treatment.
CONSTITUTION: In the manufacture of Ga from a circulating sodium aluminate soln. prepared by the Bayer process, the sodium aluminate soln. separated in the Al(OH)3 depositing stage is cooled to cause crystallization, or a substance which acts as a seed in the crystallization by cooling is added to the soln. The seed is ≥1 kind of salt selected from sodium salts of V and P and double salts each contg. sodium salt of V or P. After crystallizing and removing the impurities such as V and P, the soln. is brought into contact with oxygen or air at high temp. and pressure to oxidize org. matter in the soln., and caustification is optionally carried out. The soln. is then electrolyzed to manufacture metallic Ga. The electrolyzed soln. is refluxed to the Bayer stage.
| JP5968320 | A recovery method of indium |
HARATO TAKUO
SHINYA YASUO
KATOU HISAKATSU
SUMITOMO CHEMICAL CO