Method for reducing the viscosity and for refining kaolin clays

Details Method for reducing the viscosity and for refining kaolin clays Method for reducing the viscosity and for refining kaolin clays

C - Chemistry, Metallurgy

04

B

261/44

C04B 33/04 (2006.01)

Patent

CA 1075726

ABSTRACT OF THE DISCLOSURE A method for reducing the viscosity and for refining crude kaolin clays is disclosed. The inherent viscosities of crude kaolin clay ores, particularly those having accept- able optical and purity properties for use in preparing paper coating pigments, but normally rejected because of their high inherent viscosities, are significantly reduced by contacting an aqueous slurry of the crude clay with an inorganic polymeric complex having the general formula [AI(OH)yA3-y]x wherein x = 6 to 24, y = 1.0 to 2.75 and A is selected from the group consisting of Cl?, (SO?)0.5 and NO?. In a prefer- red embodiment the above treated clay is also subjected to a high shear mixing action or kneading prior to further con- ventional processing procedures, such as fractionation, leaching, etc. The treatment of the clay with the above polymer complex and high shear mixing or kneading have a synergistic effect in providing a refined clay product hav- ing significantly lower viscosity when dispersed or slur- ried. The refined products produced in accordance with the method thus have particular use as paper coating pigments. -I-

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