Use of dextran as a filtration aid for thickener overflow filtra

Details Use of dextran as a filtration aid for thickener overflow filtra Use of dextran as a filtration aid for thickener overflow filtra

1991-06-10

1992-02-25

Morris, Theodore

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423121, 423111, 423130, 210725, 210727, 210728, 210734, C01F 700

Patent

active

050911597

ABSTRACT:
In the Bayer process for producing alumina from bauxite of the type wherein the bauxite is added to a caustic solution to produce a soluble aluminate solution and an insoluble red mud fraction which is then subjected to one or more separation steps to produce a thickener overflow which is then subjected to a Kelly Filter Press to polish the thickener overflow the improvement which comprises treating the thickener overflow and the filter aid with a filtration improving amount of dextran.

REFERENCES:
patent: 3085853 (1983-04-01), Lesinski et al.
patent: 4789485 (1988-12-01), Field et al.
patent: 5008089 (1991-04-01), Moody et al.

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