Use of dispersants to concentrate minerals in water,...

Details Use of dispersants to concentrate minerals in water,... Use of dispersants to concentrate minerals in water,...

C - Chemistry, Metallurgy

09

C

C09C 1/02 (2006.01) B02C 23/06 (2006.01) C09C 3/04 (2006.01) C09C 3/06 (2006.01) C09C 3/08 (2006.01) C09C 3/10 (2006.01) D21H 17/67 (2006.01) D21H 19/38 (2006.01)

Patent

CA 2629622

The invention consists of the use of dispersants in a process for producing an aqueous dispersion of minerals by a) grinding said minerals at low solids content (<= 40%) in water, without dispersant and/or grinding aid, b) carrying out concentration to high solids content (>= 65%) by mechanical and/or thermal means, characterized in that at least one dispersant is introduced between step a) and step b) and/or during step b) and/or during and after step b), in the form of a combination of at least one acrylic acid homopolymer and at least one inorganic fluorine compound.

L~invention consiste en l~utilisation d~agents dispersants, dans un procédé de fabrication d~une dispersion aqueuse de matières minérales, par : a) broyage à faible extrait sec (<= 40 %) desdites matières minérales dans l~eau sans agent dispersant et/ou d~aide au broyage, b) concentration à haut extrait sec (>= 65 %) par des moyens mécaniques et/ou thermiques, caractérisée en ce que : - au moins un agent dispersant est introduit entre l~étape a) et l~étape b), et/ou pendant l~étape b), et / ou pendant et après l~étape b), - sous la forme d~une combinaisaon : - d~au moins un homopolymère de l~acide acrylique, - et d~au moins un composé minéral fluoré.

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