Method of water treatment using zeolite crystalloid coagulants

Details Method of water treatment using zeolite crystalloid coagulants Method of water treatment using zeolite crystalloid coagulants

C - Chemistry, Metallurgy

02

F

C02F 1/52 (2006.01) B01D 21/01 (2006.01) B01J 13/00 (2006.01) C02F 1/28 (2006.01) D21H 21/10 (2006.01) C02F 1/56 (2006.01) D21H 17/37 (2006.01) D21H 17/45 (2006.01) D21H 17/68 (2006.01) D21H 23/76 (2006.01)

Patent

CA 2290473

A method of coagulating particulates, as in papermaking or water clarification applications, for example, is provided wherein a zeolite crystalloid coagulant is added to water containing the solid matter, a source of multivalent cations, and a cationic acrylamide polymer. The zeolite crystalloid coagulant is preferably prepared by admixing aqueous sodium silicate and sodium aluminate solutions to form a reaction mixture and allowing a reaction to proceed for a sufficient time to form zeolite crystalloid coagulant particles having particle sizes of at least about 4 nm before terminating the reaction.

L'invention a trait à un procédé permettant de coaguler des particules, comme dans des applications relatives à la fabrication du papier ou à l'épuration de l'eau, par exemple. Selon ce procédé, un coagulant cristalloïde de zéolite est ajouté à l'eau contenant la matière solide, une source de cations multivalents et un polymère d'acrylamide cationique. Le coagulant cristalloïde de zéolite est de préférence préparé grâce au mélange de solutions aqueuses de silicate de sodium et d'aluminate de sodium et ce, dans le but de former un mélange réactionnel et de permettre la poursuite d'une réaction pendant une durée suffisante à la formation des particules d'un coagulant cristalloïde de zéolite dont la taille atteint au moins 4 nm avant la fin de la réaction.

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