C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
23/224
C01G 15/00 (2006.01)
Patent
CA 1042629
ABSTRACT OF THE DISCLOSURE Method for recovery of gallium from sodium aluminate solutions by co-precipitation of alumina and gallium oxide, followed by introducing sodium aluminate into the resultant solution to co-precipitate further alumina and gallium oxide. The specification discloses a process in which carbon dioxide is fed into gallium-containing sodium aluminate solutions in sufficient amount to co-precipitate alumina and part of the gallium as gallium oxide and form sodium bicarbonate in the solutions, after which sodium aluminate is fed into the resultant solution, whereby further alumina and gallium oxide are co-precipitated from the solution. The respective degrees to which dissolved gallium is precipitated by gassing the solution with carbon dioxide, and by adding sodium aluminate to the gassed solution, as described above, ordinarily depends on the relative economy of those respective procedures in the recovery of gallium oxide. Normally, it is economically feasible to precipitate the major portion of the gallium by gassing the solution with carbon dioxide and forming at least 90 grams per liter of sodium bicarbonate in the solution, prior to adding sodium aluminate to recover further gallium oxide from the solution.
216510
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