Preparations of suspensions of ground particulate material

Details Preparations of suspensions of ground particulate material Preparations of suspensions of ground particulate material

C - Chemistry, Metallurgy

09

C

C09C 3/04 (2006.01) C09C 1/02 (2006.01) C09C 3/00 (2006.01) C09D 17/00 (2006.01)

Patent

CA 2231689

There is disclosed a method of preparing a concentrated aqueous suspension of a finely ground particulate material by a multistage grinding process in which an aqueous suspension of the particulate material is passed to and treated by grinding in each of a series of grinding stages, wherein a water soluble polycarboxylate dispersing agent for the particulate material is added to the suspension at each of a plurality of dispersion agent addition sites or stages. The invention is characterised in that the aqueous suspension when treated by grinding in at least one of the grinding stages has a pH on the inclusive range 8.5 to 9.8. Using the method described, suspensions can be prepared which are rheologically stable with time, and which contain a relatively high proportion by weight of a finely divided pigment.

Méthode de préparation d'une suspension aqueuse concentrée d'une matière particulaire finement broyée par un procédé de broyage en plusieurs étages durant lequel une suspension aqueuse de la matière particulaire est broyée et traitée, en passant à travers une série d'étages de broyage, un polycarboxylate dispersant la matière particulaire, soluble dans l'eau, étant ajouté à la suspension en chacun d'une pluralité de points ou d'étages d'adjonction d'agent dispersant. La caractéristique de l'invention réside dans le fait qu'après être passée par au moins l'un des étages de broyage, la suspension aqueuse traitée a un pH situé entre 8,5 et 9,8 inclus. Par le procédé décrit, il est possible de préparer des suspensions rhéologiquement stables dans le temps et contenant une proportion en poids relativement élevée d'un pigment finement broyé.

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