Method for producing substantially dry water-insoluble polymers for improved flocculation in the Bayer process
AssigneeOndeo Nalco Company
InventorsEverett C. Phillips, Ronald J. Allain
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Abstract
The present invention is a method of producing substantially dry water insoluble polymers from poly alkyl esters of vinylic monomers for use in a method for the clarification of red mud-containing liquors generated in the Bayer process for the recovery of alumina from bauxite ore. The polymers can be either homopolymers, copolymers or terpolymers. Preferably, the dried emulsion polymers are high molecular weight polymers of poly(methyl acrylate), poly(methyl acrylate/acrylic acid), poly(vinyl acetate/acrylic acid/methyl acrylate), poly(t-butyl methacrylate/acrylic acid/methyl acrylate) and poly(t-butyl acrylate/acrylic acid/methyl acrylate).
Claims23
A method of treating Bayer process red mud containing liquor comprising the steps of:
- adding to the red mud-containing liquor a substantially dry water insoluble high molecular weight polymer formed from a polymer emulsion of poly alkyl esters of vinylic monomers having an intrinsic viscosity in 2N NaNO3 at 30° C. of at least 18 dL/g;
- forming a red mud phase and a clarified liquor phase;
- and
- recovering the clarified liquor phase.
A method for treating Bayer process red mud containing liquor comprising the steps of:
- adding to the red-mud containing liquor an effective amount of a substantially dry water insoluble high molecular weight polymer formed from a homopolymer emulsion wherein the homopolymer has an intrinsic viscosity in 2N NaNO3 at 30° C. of at least 15 dL/g;
- forming a red mud phase and a clarified liquor phase;
- and
- recovering the clarified liquor phase.
A method for treating Bayer process red mud containing liquor comprising the steps of:
- adding to the red-mud containing liquor an effective clarifying amount of a substantially dry water insoluble high molecular weight polymer formed from a terpolymer emulsion wherein the terpolymer has an intrinsic viscosity in 2N NaNO3 at 30° C. of at least 15 dLg;
- forming a red mud phase and a clarified liquor phase;
- and
- recovering the clarified liquor phase.
Dependencies are inferred from the claim text.