Patent ID: 8480854
Filing Date: 2013-07-09
Classification: C01F,D21F,D21H

Abstract:
1. A method for crystallizing calcium carbonate, in a short circulation of a fiber web machine, the method comprising: (a) obtaining filtrate from the fiber web machine, (b) preparing paper making stock from at least said filtrate and various fiber components, (c) pumping said paper making stock from its preparation towards the fiber web machine, and (d) providing the paper making stock with calcium carbonate crystals by feeding carbon dioxide and milk of lime into the short circulation of the fiber web machine and letting the carbon dioxide and milk of lime to react with one another, wherein the step of providing the paper making stock with calcium carbonate crystals comprises mixing at least either carbon dioxide or milk of lime into a liquid flow comprising at least one of at least one fiber component, filler component and paper making stock by