Clarification of bayer process liquors

Details Clarification of bayer process liquors Clarification of bayer process liquors

C - Chemistry, Metallurgy

01

F

23/239

C01F 7/06 (2006.01) C01F 7/46 (2006.01) C01F 7/47 (2006.01)

Patent

CA 1251917

ABSTRACT Clarification of Bayer Process Liquors The clarification of a sodium aluminate liquor in the Bayer Process, especially the liquor obtained by Kelly filter filtration of the supernatant from the primary settling stage, is improved by flocculation with a polymer of the formula CH2 = C (R1)CONHR2NR3R4 wherein R1 is hydrogen or methyl, R2 is straight or branched chain C2-8 alkylene having at least 2 carbon atoms in the backbone and R3 and R4 are independently selected from C1-4 alkyl.

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