Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1974-07-19
1976-01-20
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204105R, 204130, C25C 122
Patent
active
039336042
ABSTRACT:
A method of recovering gallium from sodium aluminate solutions comprises extracting gallium from aluminate solution by electrolysing the solution with a current density of at least 0.002 A/cm.sup.2 and a cathodic potential relative to a saturated calomel electrode of at least 1.5 volts, using an anode made from a metal which does not produce undesirable impurities in the aluminate liquor under the conditions of electrolysis and a solid cathode made of a metal into which gallium diffuses, while maintaining the temperature of the aluminate solution in the range 25.degree.to 80.degree.C until the gallium has diffused into the cathode to give a gallium content in the surface layers of at least 0.10%. The cathode metal is preferably tin, lead, indium, zinc and alloys of tin and lead. The preferred current density range is 0.005 to 0.05 A/cm.sup.2 while the preferred temperature range is 35.degree.to 65.degree.C. The gallium is subsequently separated from the cathode metal.
REFERENCES:
patent: 3677918 (1972-07-01), Miyake et al.
Honey Colin George
Jones Stanley Leonard
Andrews R. L.
Flocks Karl W.
The British Aluminium Company Limited
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