Process for preparing colloidal calcium carbonate by...

C - Chemistry – Metallurgy – 01 – F

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C01F 11/18 (2006.01)

Patent

CA 2196124

The invention provides a process for the preparation of a colloidal calcium carbonate of which the particles have a specific size in the range of more than 0.04 µm to less than 0.08 µm, which has little affinity of aggregation and has properties suitable for specific uses. First, after adding an additive, for example, sugar to increase a concentration of calcium ion, to an aqueous lime suspension, by introducing a gas containing carbon dioxide thereinto, a colloidal calcium carbonate of 0.04 µm in particle size is obtained. And then by adding a hydroxide with univalent or bivalent cation to the above aqueous suspension and agitating it at the rate of 100 to 5,000 as Reynolds number while the temperature thereof is heated up to 40 to 95 °C, a desired colloidal calcium carbonate of which particle size is increased by + 0.005 µm, i.e., 0.045, 0.050 to 0.075 µm through the ripening of particle is obtained.

Méthode pour la préparation d'un carbonate de calcium colloïdal dont les particules ont une taille spécifique spécifique de plus de 0,04 micron et de moins de 0,08 micron, montrant peu d'affinité pour l'agrégation, mais avec des propriétés utiles pour certaines applications spécifiques. Premièrement, après ajout d'un additif, par exemple du sucre pour augmenter la concentration d'ions calcium, à une suspension aqueuse de chaux, on y introduit un gaz renfermant du dioxyde de carbone et on obtient ainsi des particules de carbonate de calcium colloïdal de 0,04 micron. Puis, on ajoute un hydroxyde avec un cation monovalent ou bivalent à la suspension aqueuse et on l'agite à une valeur de 100-5000 du nombre de Reynolds, tout en augmentant la température de 40 à 95 °C, ce qui permet d'obtenir un carbonate de calcium colloïdal dont la taille des particules est de + 0,005 micron, soit 0,045, 0,050 à 0,075 micron, par mûrissement des particules.

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