A new process for the synthesis of calcium carbonate in contact with cellulosic fibers, for the manufacture of printing paper

摘要

The process enables the reuse of calcium carbonate from recycled (white water) from manufacturing machines, filtration and treatment with carbon dioxide to form the bicarbonate for subsequent re-precipitation as crystalline calcium carbonate.- DETAILED DESCRIPTION - A new process for obtaining calcium carbonate coated fibers in which the fibers are contacted with CO2 generators and a composition containing Ca++ ions which reacts with CO2 to form a fine precipitate of CaCO3 in situ on the fiber. It comprises: - (1) a stage of production of a primary composition containing Ca(HCO3)2 - (2) a stage of production of a secondary composition containing Ca(OH)2; - (3) a mixing stage of the compositions and the fibers to be treated to form a CaCO3 precipitate.- INDEPENDENT CLAIMS are also included for the new paper product obtained