Process for bleaching natural chalk

Details Process for bleaching natural chalk Process for bleaching natural chalk

1982-05-25

1986-02-25

Doll, John

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423264, G01F 1118

Patent

active

045728259

ABSTRACT:
For bleaching natural chalk, an aqueous suspension consisting of 50 to 80% by weight fine-grained natural chalk and 50 to 20% by weight water and containing 0.1 to 1.5% by weight, based on the dry weight of the chalk, of a dispersant and optionally containing a hydrogen peroxide stabilizer or activator or a salt of hydrogen peroxide with a divalent metal is prepared, the suspension is wet ground to reduce the particle size until about 9/10 of the particles have a grain size of <4, the suspension is mixed with hydrogen peroxide or a salt of hydrogen peroxide with a divalent metal at temperatures between 50.degree. and 99.degree. C. and at a specific pH-value or at an alkaline pH, respectively, and stirred intensively until it is mixed and foaming commences, the suspension is allowed to stand until foam formation is complete and then the foam formed is separated with the dark particles contained therein.

REFERENCES:
patent: 4239736 (1980-12-01), Fenske

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