Process and apparatus for preparing precipitated calcium...

C - Chemistry – Metallurgy – 01 – F

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C01F 11/18 (2006.01)

Patent

CA 2302785

This invention concerns a process and equipment for producing precipitated calcium carbonate. According to the process, limestone is burnt at a high temperature to form calcium oxide and, thereafter, calcium carbonate is formed from calcium oxide in the presence of water and carbonate ions and the formed calcium carbonate is recovered. The formation of the carbonate may be performed by carbonating calcium oxide with carbon dioxide gas in the presence of water or water vapour, or by reacting calcium oxide with soda solution. According to the invention calcium oxide is converted to calcium carbonate without separate slaking and essentially without intermediate storage, in particular without intermediate storage between the burning of the starting material and the forming of calcium carbonate. With the aid of the invention a quite advantageous solution in view of heat economy is achieved.

L'invention concerne un procédé et un équipement permettant la production de carbonate de calcium précipité. Selon le procédé de l'invention, la pierre à chaux est calcinée à haute température de manière à former de l'oxyde de calcium. Ensuite, le carbonate de calcium est formé à partir de l'oxyde de calcium en présence d'eau et d'ions carbonate, et l'on récupère le carbonate de calcium formé. La formation du carbonate peut se faire soit par carbonatation de l'oxyde de calcium à l'aide de dioxyde de carbone gazeux en présence d'eau ou de vapeur d'eau, soit par réaction de l'oxyde de calcium avec une solution sodée. Selon l'invention, l'oxyde de calcium est transformé en carbonate de calcium sans extinction séparée, et essentiellement, sans stockage intermédiaire, en particulier, sans stockage intermédiaire entre la calcination de la matière première et la formation de carbonate de calcium. L'invention constitue une solution relativement avantageuse en termes d'économies de chaleur.

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