Dewatering of alumina trihydrate

Details Dewatering of alumina trihydrate Dewatering of alumina trihydrate

1989-09-15

1991-04-30

Kruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210727, 210728, 210772, 423130, B01D 3703

Patent

active

050116126

ABSTRACT:
This invention relates to a method of improving the dewatering of alumina trihydrate obtained by the Bayer process. The method comprises treating the alumina trihydrate with the product of mixing an alkaline liquor and a C.sub.8 to C.sub.20 fatty acid, fatty acid precursor such as an ester or amide, or a fatty acid blend. The product, a fatty acid salt, is an effective dewatering aid.
The alumina trihydrate may be washed with a liquor including said product, or the product may be added to a Bayer liquor slurry prior to filtration of the alumina trihydrate.
The invention also contemplates a watering aid consisting of the product of mixing an alkaline liquor with a C.sub.8 to C.sub.20 fatty acid or fatty acid precursor.

REFERENCES:
patent: 2701751 (1955-02-01), Porter
patent: 2975123 (1961-03-01), Head
patent: 4113466 (1978-09-01), Weston
patent: 4410431 (1983-10-01), Roe
patent: 4737352 (1988-04-01), Owen et al.

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