C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/166
C22B 58/00 (2006.01) C01G 15/00 (2006.01) C22B 3/38 (2006.01) C22B 7/02 (2006.01)
Patent
CA 1309869
ABSTRACT The present invention relates to a method for selective extraction of gallium from dust which is recovered from gas collecting systems in plants for electrolytic production of aluminium. The dust is leached in an aqueous hydrochloric acid solution at a temperature between 50° and 120°C whereby gallium is leached as gallium chloride. Gallium chloride is thereafter selectively extracted from the leach solution by an organic phase consisting of undiluted tri-n-butyl- phosphate, whereafter gallium is stripped from the organic phase by water or an alkaline solution of NaOH with a consentration of 0.1 to 3 M, preferably 1 - 2 M.
523662
Boe Gunnar H.
Engdal Svein E.
Gundersen Roald
Boe Gunnar H.
Elkem A/s
Engdal Svein E.
Gundersen Roald
Macrae & Co.
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