Electrolysis: processes – compositions used therein – and methods – Electrolytic synthesis – Utilizing fused bath
Patent
1996-04-19
1998-02-24
Valentine, Donald R.
Electrolysis: processes, compositions used therein, and methods
Electrolytic synthesis
Utilizing fused bath
423123, 423628, 23305A, C25C 306, C01F 100, C01F 702
Patent
active
057208689
ABSTRACT:
A method of making activated alumina includes beginning with a leach liquor of potassium and aluminum sulphates that is subjected to a surface-cooled crystallizer with a heat-exchanger input temperature of 160.degree. F. and a surface-chilled temperature of 60.degree. F. Crystals of aluminum sulphate are precipitated and recrystalized by evaporation in a vacuum and at an elevated temperature. Purified crystals of aluminum sulphate are then dried at 50.degree.-60.degree. C. The dried aluminum sulphate crystals are then dehydrated at 400.degree.-450.degree. C. after a rise rate of 50.degree.-60.degree. C. per minute to drive off most of the water. A roasting and recalcination step at 1000.degree. C.-1050.degree. C. after a rise rate of 50.degree.-60.degree. C. per minute is used drive off the sulphate. The remaining alumina is smelted by electrolysis for aluminum.
REFERENCES:
patent: 3862293 (1975-01-01), Maurel et al.
patent: 4031182 (1977-06-01), Loest
patent: 4394368 (1983-07-01), Shanks
patent: 4618480 (1986-10-01), Hazen et al.
Ahghar Massoud
Lane Stephen J.
Rendall John S.
Schatzel Thomas E.
Solv-Ex Corporation
Valentine Donald R.
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