Title: Method of extracting gallium form dissociation mother liquor form the prodn. of alumina
Application Number: 85100163 Application Date: 1985.04.01
Publication Number: 1001994 Publication Date: 1986.07.30
Approval Pub. Date: Granted Pub. Date: 1990.08.08
International Classifi-cation: C22B58/00,C25C1/22
Applicant(s) Name: Shandong Aluminium Plant Address:
Inventor(s) Name: Fan Chenzheng
Attorney & Agent: YANG SIMING
Abstract:
     The process consists in passing CO2 into the mother liquor remained after separation of aluminium hydroxide by carbonation dissociation treatment complete carbonation dissociation, gallium and aluminium are thus precipitated as amorphous hydrate. Separation of the precipitate removes most part of Na2O. Introducing slaked lime into the precipitate to remove alumina, a gallium-rich solution is produced. On passing CO2 into the solution again, a gallium-rich precipitate is obtained. Dissolving the gallium-rich precipitate with sodium hydroxide liquor and adding sodium sulfide to remove heavy metals, a solution containing 3-9 grams gallium per liter for electrolysis is obtained. This solution is electrolyzed in an electrolytic cell with stainless steel anode and cathode, gallium is deposited on the cathode. By treating with hydrochloric acid, gallium metal with a purity of 99.99-99.999% can be produced.
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