Patent ID: 6599390
Filing Date: 2003-07-29
Classification: D21C,D21H

Abstract:
A process far loading calcium carbonate into fibers contained in a pulp suspension, the process comprising the steps of:providing a pulp suspension comprised of fibers; providing a calcium-rich medium, said calcium-rich medium being comprised of at least one of calcium oxide and calcium hydroxide; adding said calcium-rich medium to said pulp suspension to form a calcium-treated pulp suspension; providing a plurality of reactors, wherein said plurality of reactors includes at least one section of reactors, said at least one section of reactors being connected in parallel, each reactor being fluidly coupled to a source of a carbon-dioxide medium, said carbon-dioxide medium being one of pure carbon dioxide and a medium containing carbon dioxide; charging said calcium-treated pulp suspension and said carbon-dioxide medium into at least one reactor to promote a chemical reaction to form calcium carbonate and thereby load said fibers with said calcium carbonate; and producing a different crystalline form of calcium carbonate in each of said parallel-connected reactors; and mixing together said different crystalline forms of calcium carbonate.