Process for the production of precipitated calcium...

C - Chemistry – Metallurgy – 01 – F

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C01F 11/18 (2006.01)

Patent

CA 2490026

A process for producing precipitated calcium carbonate, including the steps of providing calcium hydroxyde, and carbonating the calcium hydroxyde with carbon dioxyde gas and communicating for a time sufficient to produce a calcium carbonate having at least about a 90 weight percent conversion to calcium carbonate and having a solids concentration of at least about 90 weight percent. Also, a process for producing precipitated calcium carbonate, including the steps of providing calcium hydroxide, carbonating the calcium hydroxide with carbon dioxide gas for a time sufficient to at least partially convert the calcium hydroxide to calcium carbonate, comminuting the at least partially converted calcium hydroxide, and sequentially repeating steps of carbonating and comminuting for a time sufficient to substantially convert the calcium hydroxide to calcium carbonate having at least about a 90 weight percent conversion to calcium carbonate and having a solids concentration of at least about 90 weight percent.

L'invention concerne un procédé de production de carbonate de calcium précipité, consistant à produire de l'hydroxyde de calcium, et à carbonater cet hydroxyde de calcium avec du dioxyde de carbone, puis à les mélanger durant un temps suffisant pour produire un carbonate de calcium possédant au moins une conversion d'environ 90 % en poids du carbonate de calcium et une teneur en solides d'au moins environ 90 % en poids. L'invention concerne également un procédé de production de carbonate de calcium précipité, consistant à produire de l'hydroxyde de calcium, à carbonater cet hydroxyde de calcium avec du dioxyde de carbone durant un temps suffisant pour convertir au moins partiellement l'hydroxyde de calcium en carbonate de calcium, à mélanger cet hydroxyde de calcium au moins partiellement converti, et à répéter les étapes de carbonation et de mélange de façon séquentielle durant un temps suffisant pour sensiblement convertir l'hydroxyde de calcium en carbonate de calcium possédant au moins une conversion d'environ 90 % en poids de carbonate de calcium et une teneur en solides d'au moins environ 90 % en poids.

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