Production of alumina

Details Production of alumina Production of alumina

1976-07-06

1977-07-26

Carter, Herbert T.

Chemistry: physical processes

Physical processes

23302R, 210 24, 210263, 423119, 423121, 423122, 423127, 423130, C01F 706, B01D 902

Patent

active

040380394

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 supersaturated 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.

REFERENCES:
patent: 2554343 (1951-05-01), Poll
patent: 2806766 (1957-09-01), Anderson
patent: 2935376 (1960-05-01), Roberts
patent: 2981600 (1961-04-01), Porter
patent: 3002809 (1961-10-01), Walker
patent: 3372985 (1968-03-01), Roberts et al.
patent: 3649185 (1972-03-01), Furukawa et al.
patent: 3729542 (1973-04-01), Goheen
patent: 3899571 (1975-08-01), Yamada et al.

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