Treatment of solid containing material derived from effluent

D - Textiles – Paper – 21 – C

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D21C 11/12 (2006.01) C01F 11/18 (2006.01) D21H 17/67 (2006.01) F23G 7/04 (2006.01)

Patent

CA 2200512

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°C to 800°C preferably 600°C to 750°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.

Méthode pour traiter des matières contenant des solides provenant des effluents d'usines ou résultant de procédés industriels, par exemple, une usine de désencrage de rebuts de papier. Un tel effluent comporte une suspension aqueuse de matières solides comprenant des matières organiques et des matières inorganiques particulaires. Les matières inorganiques particulaires contiennent une quantité importante de carbonate de calcium et peuvent contenir du kaolin et du métakaolin. Les matières solides peuvent contenir des particules carbonées. La méthode comporte les étapes suivantes : soumettre la matière contenant des solides à un procédé thermique dans le cadre duquel la température est maintenue entre 600 et 800 degrés Celsius, de préférence entre 600 et 750 degrés Celsius, pour brûler la matière organique sans entraîner une décomposition de plus de 50 % par poids, de préférence pas plus de 10 % par poids, du carbonate de calcium présent, pour produire une matière inorganique contenant des particules de carbonate de calcium essentiellement exempt de matières organiques. Le produit particulaire est préférablement blanc et peut être utilisé comme pigment ou matière filtrante, par exemple, dans la fabrication du papier.

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