Process for concentrating and recovering gallium

Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge

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75120, 75121, 423106, 423127, 423158, 423119, C25C 100

Patent

active

040714225

ABSTRACT:
Gallium and other values are recovered from phosphorus-furnace flue-dust by treating dust with sulfuric acid to form a solution and a residue. The residue may be treated for recovery of values. Zinc is precipitated from the solution as zinc ammonium sulfate hexahydrate and an alkaline material is added to precipitate a gallium concentrate and to form a gallium-free solution, which may be treated for recovery of sulfate and phosphate values. The gallium concentrate may be upgraded by mixing concentrate with lime to precipitate calcium phosphate and by subsequently adding sodium hydroxide to redissolve coprecipitated gallium and aluminum compounds. Residual precipitate is recycled and the solution is neutralized to precipitate an upgraded concentrate. Aluminum may be removed as calcium aluminate. Upgraded concentrate may be dissolved in alkaline solution and the solution electrolyzed for deposition and recovery of gallium.

REFERENCES:
patent: 1855455 (1932-04-01), McCutcheon
patent: 2557326 (1951-06-01), Tuwiner
patent: 2582376 (1952-01-01), Frary
patent: 2582377 (1952-01-01), Brown
patent: 2582378 (1952-01-01), Brown
patent: 3170857 (1965-02-01), Dotzer
patent: 3904497 (1975-09-01), Sleppy et al.

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