Production of alumina

Details Production of alumina Production of alumina

C - Chemistry, Metallurgy

01

F

23/246

C01F 7/20 (2006.01) C01F 7/47 (2006.01)

Patent

CA 1066482

ABSTRACT In order to control the sodium oxalate level in the liquor employed in the Bayer process for the production of alumina, a part of the spent liquor recovered from alumina trihydrate precipitation stage is concentrated by evaporation to render it super- saturated with respect to sodium oxalate. The thus concentrated liquor is then sprayed onto a packing in an enclosed space under conditions such that the supersaturation of the droplets at impact on the packing exceeds a critical supersaturation. The sprayed liquor deposits sodium oxalate on the packing and is recovered for recirculation to the process circuit. -1-

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