Process for preparing a purified mineral coating

Details Process for preparing a purified mineral coating Process for preparing a purified mineral coating

C - Chemistry, Metallurgy

09

C

23/186

C09C 3/00 (2006.01) B01J 37/03 (2006.01) B01J 37/12 (2006.01) C04B 33/04 (2006.01) C09C 1/42 (2006.01) D21H 17/68 (2006.01) D21H 19/40 (2006.01)

Patent

CA 2012038

A process is provided for purifying finely divided minerals contacting organic material suffi- ciently to make the minerals useful for coating a filling paper or for use as catalysts, catalyst supports or the like. The process comprises concomi- tantly contacting an aqueous slurry of the mineral with a peroxygen and a gas containing ozone at a pH from 5 to 12. Preferably, the peroxygen is incorpo- rated into the slurry prior to contacting the slurry wlth a gas containing ozone. Optionally, the slurry may be pretreated with a chelating agent or subse- quently bleached with a reducing agent.

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