Process for recovery of alumina-cryolite waste in aluminum production
AssigneeDorr-Oliver Incorporated
InventorsElliott J. Roberts, Stanley Bunk, Peter Allen Angevine
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Abstract
Alumina-cryolite waste from aluminum pot lines is subjected to oxidation in a fluidized bed reactor to remove carbon and organic contamination. Agglomeration of the alumina-cryolite product occurs in the fluidized bed and a pellet product suitable for return to the aluminum pot lines is produced.
Claims7
A process for recovering alumina-cryolite waste generated in aluminum pot lines comprising, charging the alumina-cryolite waste containing carbon and organic contaminants into a reaction bed of particulate solids maintained in the fluidized state by an upflowing stream of oxidizing gas, maintaining the temperature of said bed in the range from about 770.degree. to 800.degree. C. to promote a combustion reaction and produce at least a small amount of a liquid phase in said bed to promote agglomeration, retaining the alumina-cryolite waste in the fluidized bed until the combustion reaction consumes the carbon and organic contaminants, the alumina-cryolite product agglomerating at temperature in the fluidized bed to pellet form, discharging the product pellets from the fluidized bed and cooling the discharged pellets.
Dependencies are inferred from the claim text.