Electrolytic purification of calcium carbonate

C - Chemistry – Metallurgy – 01 – F

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C01F 11/18 (2006.01) A23L 1/304 (2006.01) A61K 33/10 (2006.01) C01F 11/02 (2006.01) C04B 2/04 (2006.01) D21H 17/67 (2006.01)

Patent

CA 2373081

The present invention provides an electrochemical process for reducing metal contaminants in calcium carbonate by solubilizing the metal contaminate in an aqueous solution of calcium carbonate and then removing the solubilized metal contaminant by passing an electrical current through the aqueous calcium carbonate containing the solubilized metal contaminant. Calcium carbonate produced according to the process of this invention is particularly suitable for use as food or pharmaceutical additives. The calcium carbonate is also suitable for use in papermaking process as fillers, or coatings, or as additives in the production of plastics, paints and adhesive products. Other uses of high purity calcium carbonate include catalysts and catalyst supports, electrical/semiconductor applications, fluorescent lighting, and optical/laser applications.

L'invention concerne un procédé électrolytique permettant de réduire les contaminants métalliques dans le carbonate de calcium. Ce procédé consiste à dissoudre le contaminant métallique dans une solution aqueuse de carbonate de calcium, puis à extraire ce contaminant métallique dissout en faisant passer un courant électrique à travers le carbonate de calcium aqueux contenant le contaminant métallique dissout. Le carbonate de calcium obtenu par ce procédé convient particulièrement à l'utilisation en tant qu'additif alimentaire ou pharmaceutique. Il peut également servir de charge ou de revêtement dans les procédés de production de papier, ou d'additif dans la production de plastiques, de peintures et de produits adhésifs. Les autres applications de ce carbonate de calcium à degré de pureté élevé comprennent notamment les catalyseurs, et les supports catalytiques, les applications électriques/semiconducteurs, l'éclairage par fluorescence et les applications optiques/laser.

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