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US 4,468,375 AGranted
Production of alumina from aluminum-containing mineral ores with sodium bicarbonate
AssigneeAluminum Company of America
InventorChanakya Misra
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Abstract
A process for the production of alumina from aluminum-containing mineral ores, such as bauxite, comprising comminuting the aluminum-containing mineral ore, then reacting the comminuted mineral ore at an elevated temperature with an aqueous solution having at least 150 grams per liter of sodium bicarbonate which forms a solid reaction product containing dawsonite and impurities, and finally converting the dawsonite to alumina.
Claims20
A process for production of alumina from aluminum-containing mineral ore comprising:
- (a) comminuting an aluminum-containing mineral ore selected from the group consisting of aluminous clay having an alumina content of about 20 to 40 weight percent, bauxite, kaolinite and metakaolinite;
- (b) reacting the comminuted mineral ore at an elevated temperature of about 125.degree. to 300.degree. C. with an aqueous solution containing at least 150 grams per liter of sodium bicarbonate, thereby to form a solid reaction product comprising dawsonite and impurities;
- and
- (c) converting the dawsonite to alumina.
1 more element
Dependencies are inferred from the claim text.