Method for improving the consolidation and dewatering of...

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 1/56 (2006.01)

Patent

CA 2633615

Methods are provided for treating suspensions of particles to improve the drainage rate and/or the solids content of flocs of the particles. The method includes the steps of (i) providing a suspension which comprises particles in a fluid; (ii) adding a cyclodextrin compound to the suspension; and (iii) dewatering the suspension by removing at least a portion of the fluid to form a cake comprising the particles. The cyclodextrin compound desirably is added in an amount effective to increase the dewatering rate of the flocs, to increase the solids content, or both, over that rate, solids content, or both, that would be obtained without the addition of the cyclodextrin compound. The suspension may be, for example, a biological or non-biological sludge, or a suspension of pulp fibers, such as in a pulping or papermaking process.

L'invention concerne des procédés pour traiter des suspensions de particules, permettant d'améliorer le débit de drainage et/ou le contenu de solides de flocons de particules. Ledit procédé comprend les étapes suivantes : (i) production d'une suspension comprenant des particules dans un fluide ; (ii) ajout d'un composé de cyclodextrine à la suspension ; et (iii) déshydratation de la suspension par élimination d'au moins une partie du fluide pour former un gâteau comprenant des particules. Le composé de cyclodextrine est ajouté, de préférence, dans une quantité efficace, ce qui permet d'améliorer le taux de déshydratation des flocons, d'améliorer le contenu des solides, ou les deux, sur ledit débit, qui peuvent être obtenus sans l'ajout du composé de cyclodextrine. La suspension peut être, par exemple, une boue biologique ou non biologique, ou une suspension de fibres de pulpes, telles que celles utilisées dans des processus de désintégration ou de fabrication du papier.

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