Method for purification of calcium carbonate

Details Method for purification of calcium carbonate Method for purification of calcium carbonate

C - Chemistry, Metallurgy

01

F

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

Patent

CA 2205599

A method for lowering the iron content of calcium carbonate is disclosed. The method involves addition of an iron chelating agent to an aqueous calcium carbonate slurry, reducing the pH of the aqueous calcium carbonate slurry by employing carbon dioxide containing gas, while maintaining the aqueous calcium carbonate slurry at an elevated temperature. The slurry is stirred, filtered, washed and dried. The calcium carbonate product resulting from the process of the present invention has a reduced iron content. Calcium carbonate produced according to the method of this invention is particularly suitable for use as food or pharmaceutical additives and may also be useful as a filler in papermaking processes or as additives in plastic products.

Procédé permettant de réduire la teneur en fer du carbonate de calcium. Ce procédé consiste à ajouter un agent chélatant de fer à une suspension aqueuse de carbonate de calcium, à réduire le pH, la suspension aqueuse de carbonate de calcium au moyen d'un gaz contenant du dioxyde de carbone, tout en maintenant la suspension aqueuse de carbonate de calcium à une température élevée. La suspension est remuée, filtrée, lavée et séchée. Le carbonate de calcium ainsi produit a une teneur en fer inférieure. Le carbonate de calcium obtenu selon ce procédé convient particulièrement à une utilisation en tant qu'additif alimentaire ou pharmaceutique. Il peut également servir de matière de remplissage dans la fabrication du papier ou d'additif dans la fabrication de matières plastiques.

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