Wet-grinding gypsum with polycarboxylates

Details Wet-grinding gypsum with polycarboxylates Wet-grinding gypsum with polycarboxylates

C - Chemistry, Metallurgy

04

B

C04B 11/00 (2006.01)

Patent

CA 2705309

The process of the present invention includes obtaining a feed material having an initial median particle size A solution of a polycarboxylate dispersant in water is formed, then the feed material is added to the solution to form a slurry The slurry is wet- ground to reduce the median particle size of the feed material Optionally, the total amount of polycarboxylate dispersant is divided into a plurality of doses that are added periodically over the total grinding time.

Le procédé de la présente invention comprend l'obtention d'un matériau de charge ayant une taille particulaire initiale moyenne. Une solution d'un dispersant polycarboxylate dans de l'eau est formée, puis le matériau de charge est ajouté à la solution afin de former une boue. La boue est broyée en milieu humide afin de réduire la taille particulaire moyenne du matériau de charge. Eventuellement, la quantité totale du dispersant polycarboxylate est divisée en une pluralité de doses qui sont ajoutées périodiquement pendant le temps de broyage total.

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