C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
C01F 11/18 (2006.01) C01B 31/24 (2006.01) C01F 5/24 (2006.01)
Patent
CA 2438039
A process for improving the brightness of an alkaline earth metal carbonate utilizing formamidine sulfinic acid or sodium dithionite as a reductive bleaching agent is disclosed. Where the alkaline earth metal carbonate is calcium carbonate, addition of the reductive bleaching agent to an aqueous slurry of the calcium carbonate takes place prior to, during, or after formation of the carbonate, which is chosen from at least one of a precipitated calcium carbonate and a ground calcium carbonate.
L'invention concerne un procédé permettant d'améliorer la brillance d'un carbonate de métal alcalino-terreux au moyen d'acide sulfinique de formamidine ou de dithionite de sodium comme agent de blanchiment réducteur. Si le carbonate de métal alcalino-terreux est un carbonate de calcium, on ajoute l'agent de blanchiment réducteur à une suspension aqueuse de carbonate de calcium avant, pendant ou après la formation du carbonate, choisi parmi au moins un carbonate de calcium précipité et un carbonate de calcium naturel.
Golley Christopher R.l.
Mortimer Mark Daniel
Payton Desmond Charles
Perez Florangel D.
Thrale Deborah Susan
Imerys Minerals Limited
Mortimer Mark Daniel
Sim & Mcburney
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