Water soluble polymers

Details Water soluble polymers Water soluble polymers

B - Operations, Transporting

01

D

B01D 21/01 (2006.01) C02F 1/54 (2006.01) C02F 1/56 (2006.01)

Patent

CA 2128339

Water soluble polymer flocculants are formed from monomers derived from ethylenically unsaturated dibasic carboxylic acids of formula (I) where R1 = H and R2- = COOH or R1 = COOH and R2 = H. Flocculants are provided for use in Bayer process liquors which are copolymers of acids of formula (I) with ethylenically unsaturated copolymerisable monomer and which have molecular weight above 300,000. Preferably the polymer is a terpolymer of dibasic acid, monobasic and polymerisable termonomer. A particularly preferred flocculant is formed from at least 10 mol% maleic acid with acrylic acid and acrylamide as comonomers and is used preferably for flocculation of red mud in the primary settler and/or the various red mud washing stages.

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