Treatment of solid containing material derived from effluent of

Details Treatment of solid containing material derived from effluent of Treatment of solid containing material derived from effluent of

1997-03-21

1998-12-08

Silverman, Stanley S.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162189, 210180, 210928, D21C 1100

Patent

active

058463780

ABSTRACT:
A method is described for the treatment of a solid containing material obtained from effluent from an industrial plant or process, eg. a plant for the de-inking of waste paper. Such effluent comprises an aqueous suspension of solids comprising organic material and inorganic particulate material. The inorganic particulate material contains a substantial amount of calcium carbonate and is likely also to contain kaolin or metakaolin. The solids may also contain carbon particles. The method includes subjecting the solid containing material to a heat treatment process such that the temperature is controlled to be maintained in the range 600.degree. C. to 800.degree. C. preferably 600.degree. C. to 750.degree. C., to cause burning of the organic material without decomposition of more than about 50% by weight, preferably not more than about 10% by weight, of the calcium carbonate present to produce a particulate calcium carbonate-containing inorganic material substantially free of organic material. The particulate product is preferably white and useful as a pigment or filler material, eg. in paper making.

REFERENCES:
patent: 3320076 (1967-05-01), Sutton et al.
patent: 3765921 (1973-10-01), Puskar
patent: 4479920 (1984-10-01), Dodson
WPI Abstract Accession No. 92-075327/10 JP 040018185A.

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