Process for preparing calcium carbonate particles

C - Chemistry – Metallurgy – 01 – F

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C01F 11/18 (2006.01) C09C 1/02 (2006.01)

Patent

CA 2302768

The invention is related to a method for forming calcium carbonate. In the method, calcium oxide is reacted with carbonate ions in the presence of water to produce calcium carbonate. According to the invention, the formation is carried out directly from calcium oxide to calcium carbonate without intermediate stages in a three-phase precipitation, whereby the hydration of the calcium oxide to calcium hydroxide and the carbonation of the hydrated part are carried out immediately after one another under so intensive agitation that the calcium carbonate elements thus created are detached from the surface of the calcium hydroxide. The mixing is preferably carried out in a fluid medium where the amount of gases phase is at least 20 parts by volume and the amount of liquid phase is 0.5 to 1 part per one part by volume of the solid matter of the suspension. In the process, the desired end product, PCC, can be prepared in a very short residence time and with a small operational content.

L'invention concerne un procédé de formation de carbonate de calcium. Ce procédé consiste à faire réagir de l'oxyde de calcium avec des ions carbonate en présence d'eau, de manière à obtenir du carbonate de calcium. Selon l'invention, le carbonate de calcium est obtenu directement à partir de l'oxyde de calcium, sans étape intermédiaire, dans une précipitation à trois phases. On effectue successivement l'hydratation de l'oxyde de calcium pour le transformer en hydroxyde de calcium et la carbonatation de la partie hydratée après les avoir si fortement agités pour que les éléments de carbonate de calcium ainsi formés se détachent de la surface de l'hydroxyde de calcium. On effectue le mélange de préférence dans un milieu fluide dans lequel la quantité de phase gazeuse représente au moins 20 parties en volume et la quantité de phase liquide est comprise entre 0,5 et 1 partie pour une partie en volume de matière solide de la suspension. Selon le procédé, le produit voulu obtenu, à savoir le PCC, peut être préparé en un temps de séjour très court et en un minimum d'opérations.

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