C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
C01F 11/18 (2006.01)
Patent
CA 2213750
A process for producing precipitated calcium carbonate having a particle size D50 of from 1 to 2 microns inclusive includes the steps of first contacting carbon dioxide gas with either ammonium hydroxide or with ammonia gas in the presence of water, to produce a solution of ammonium carbonate, and then contacting the solution of ammonium carbonate with a solution of calcium nitrate at a temperature below 58 ~C and at a pH from 6.5 to 9.0 inclusive, optionally under pressure, to precipitate the calcium carbonate as a fine powder.
Cette invention concerne un procédé de production de carbonate de calcium précipité dont la taille des particules D¿50? est comprise entre 1 et 2 microns inclus, ledit procédé consistant tout d'abord à mettre en contact du gaz carbonique, en présence d'eau, afin d'obtenir une solution de carbonate d'ammonium, puis à mettre en contact la solution de carbonate d'ammonium avec une solution de nitrate de calcium à une température inférieure à 58 ·C et à un PH compris entre 6,5 et 9,0 inclus, éventuellement sous pression, afin de faire précipiter le carbonate de calcium sous la forme d'une fine poudre.
Aeci Limited
Kirby Eades Gale Baker
Minerals Technologies Inc.
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