Pigment treatment method

Details Pigment treatment method Pigment treatment method

C - Chemistry, Metallurgy

09

C

6/216

C09C 1/02 (2006.01) C09C 3/06 (2006.01)

Patent

CA 1125456

ABSTRACT OF THE DISCLOSURE Methods of treating calcium sulphate (gypsum) so that it can be used as a pigment or filler agent are disclosed. The method includes treatment of the calcium sulphate with an oxidizing bleaching agent, such as chlorine, hypochlorites, hypochlorous acid, chlorine dioxide, and various peroxides. Preferably the treatment is carried out with the calcium sulphate being in the form of an aqueous suspension, and the calcium sulphate slurry is subjected to washing and fraction- ation in order to obtain a definite particle size distribution.

338625

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