Patent ID: 6537425
Filing Date: 2003-03-25
Classification: D21C,D21H

Abstract:
A chemical process of loading calcium carbonate into fibers, the fiber being contained in a pulp suspension, said chemical process comprising the steps of:providing a pulp suspension of greater than five percent (5%) consistency and a calcium-rich medium, said calcium-rich medium containing at least one of calcium oxide and calcium hydroxide; adding said calcium-rich medium to said pulp suspension to form a calcium-rich pulp suspension; providing at least one reactor, each reactor having a source of a carbon-dioxide medium connected thereto, said carbon-dioxide medium being comprised of one of pure carbon dioxide and a medium containing carbon dioxide, said carbon-dioxide medium having a medium temperature associated therewith, said medium temperature being at least one of adjustable and controllable within an approximate range of âˆ’10Â° C. to 250Â° C.; charging said calcium-rich pulp suspension and said carbon-dioxide medium into said at least one reactor, said calcium-rich pulp suspension and said carbon-dioxide medium thereby causing a chemical reaction in a carbon dioxide rich atmosphere to form calcium carbonate and water; and controlling a pH of at least one of said pulp suspension and said calcium-rich pulp suspension.