Dewatering

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B - Operations, Transporting

01

D

134/56

B01D 37/03 (2006.01) C01F 7/14 (2006.01) F26B 5/00 (2006.01)

Patent

CA 1317191

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 C8 to C20 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 sayer liquor slurry prior to filtration of the alumina trihydrate. The invention also contemplates a dewatering aid consisting of the product of mixing an alkaline liquor with a C8 to C20 fatty acid or fatty acid precursor.

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