B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 21/01 (2006.01) C01F 7/06 (2006.01) C02F 1/56 (2006.01)
Patent
CA 2314946
The present invention is directed to improvements in the Bayer mining process, used for the recovery of alumina from bauxite ore. Water-continuous emulsion polymers are advantageously used to improve the clarification, filtration and scale control of red-mud containing liquors generated during the Bayer process. Preferred polymers are high molecular weight poly(methyl acrylate/acrylic acid), poly(methyl acrylate), poly(vinyl acetate/acrylic acid/methyl acrylate) and a combination of a high molecular weight poly(methyl acrylate/acrylic acid) with a lower molecular weight poly(methyl acrylate/acrylic acid).
La présente invention concerne des améliorations apportées au procédé Bayer d'exploitation minière, utilisé pour la récupération d'alumine à partir de minerais de bauxite. On utilise avantageusement des polymères en émulsion continue dans l'eau pour améliorer la clarification, la filtration et l'élimination des dépôts de solutions contenant de la boue rouge produites lors du procédé Bayer. Les polymères préférés sont le poly(méthyl acrylate/acide acrylique), le poly(méthyl acrylate), le poly(vinyl acétate/acide acrylique/méthyl acrylate) de poids moléculaire élevé et une combinaison d'un poly(méthyl acrylate/acide acrylique) de poids moléculaire élevé et d'un poly(méthyl acrylate/acide acrylique) de poids moléculaire plus faible.
Counter James Adrian
Phillips Everett C.
Selvarajan Radhakrishnan
Strominger Michael G.
Marks & Clerk
Nalco Chemical Company
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