Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1977-06-01
1978-06-13
Tufariello, T. M.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
423122, 423132, C25C 100, C01F 100
Patent
active
040947530
ABSTRACT:
A process is described for the recovery of gallium from scrap materials in which the gallium occurs as gallium compounds containing at least one element selected from the group consisting of aluminum, antimony, arsenic and phosphorus. The process comprises the steps of leaching said gallium compounds with an oxidizing agent selected from nitric acid and a combination of nitric acid and hydrogen peroxide to form a gallium-containing leach solution, forming a gallate solution from said gallium-containing solution, and recovering gallium from said gallate solution. The leach solution can be treated with a calcium compound chosen from the group consisting of lime and calcium hydroxide for precipitation of calcium arsenate and calcium phosphate. An alkaline material such as sodium hydroxide may then be added to said leach solution in an amount sufficient to raise the pH to a value of at least 11 to form gallate solution. Gallium metal preferably is recovered from said gallate solution by electrolysis. BACKGROUND OF THE INVENTION
REFERENCES:
patent: 2582378 (1952-01-01), Brown
patent: 3890427 (1975-06-01), Dewey et al.
patent: 3904497 (1975-09-01), Sleppy et al.
Charlton Thomas L.
Redden Robert F.
Cominco Ltd.
Fors Arne I.
Tufariello T. M.
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