Blends of hydroxamated polymer emulsions with polyacrylate...

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 33/26 (2006.01) B01D 21/01 (2006.01) C01F 7/06 (2006.01) C02F 1/56 (2006.01) C08L 33/10 (2006.01)

Patent

CA 2204365

A composition comprising a blend of an inverse emulsion of a hydroxamated polymer and a second inverse emulsion of a second polymer selected from the group consisting of alkali metal (meth)acrylate homopolymers, ammonium (meth)acrylate homopolymers, and copolymers of the (meth)acrylates with (alk)acrylamides, wherein the molar ratio of hydroxamated polymer to said second polymer in the emulsion is within the range of about 99:1 to 15:85 when the second polymer is an alkali metal (meth)acrylate homopolymer or copolymer and is within the range of about 99:1 to 58:42 when said second polymer is an ammonium (meth)acrylate homopolymer or copolymer. Processes for removing suspended solids from Bayer alumina process streams using these compositions are also provided.

L'invention concerne une composition comprenant un mélange d'une émulsion inverse d'un polymère hydroxamaté et une deuxième émulsion inverse d'une deuxième polymère sélectionné dans le groupe se composant d'homopolymères de (méth)acrylate de métaux alcalins, d'homopolymères de (méth)acrylate d'ammonium, et de copolymères des (méth)acrylates avec des (alc)acrylamides. Le rapport molaire du polymère hydroxamaté sur le deuxième polymère dans l'émulsion se situe dans la plage comprise entre 99:1 et 15:85 lorsque le deuxième polymère est un homopolymère de (méth)acrylate de métal alcalin ou un copolymère, et se situe dans une plage comprise entre 99:1 à 58:42 lorsque ledit deuxième polymère est un homopolymère de (méth)acrylate d'ammonium ou un copolymère. L'invention concerne aussi des procédés pour retirer les solides en suspension des circuits d'alumine de Bayer à l'aide de ces compositions.

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