Abstract: A method for manufacture of loaded paper or paperboard products, comprising the steps of separating at least one process stream from the papermaking process, wherein the process stream includes fines and/or filler; combining the process stream with long fibers and thickening to form a residue; treating the residue to form fiber-filler complexes; and using the fiber-filler complexes in the papermaking process to form the paper.

Abstract: A method for manufacture of loaded paper or paperboard products, comprising the steps of separating at least one process stream from the papermaking process, wherein the process stream includes fines and/or filler; combining the process stream with long fibers and thickening to form a residue; treating the residue to form fiber-filler complexes; and using the fiber-filler complexes in the papermaking process to form the paper.

Abstract: A method for enhancing the deposition and retention of particulate filler on papermaking fibers. In a first vessel, there is formed a slurry of papermaking fibers and in a second vessel there is formed a slurry of lime or its equivalent. The fiber slurry is at a consistency of not greater than about 5%. These separately formed slurries are thereafter combined with a gaseous precipitant in a flow reactor and under conditions whereby the gaseous precipitant is subjected to rapid shear and calcium carbonate is deposited in situ on the fibers. Unexpectedly, the reaction time for the formation and deposition of the calcium carbonate filler is very rapid. Control over the pH of the reactants in the reactor is achieved through the sequence of introduction of the reactants to the reactor. Also, through selection of the molar ratio of the gaseous precipitant and lime, the morphology of the calcium carbonate crystals may be controlled.

Abstract: A method for the recovery of chemical values from spent lignocellulosic pulping liquor salts to produce white liquor of different sulfidities. Preferably, the white liquor is in the form of separate liquid streams, each of which is of a sulfidity that is different from the sulfidity of others of the streams. The method also provides for developing a white liquor stream which is essentially free of sulfide values, but which contains sodium hydroxide. Further, the method provides for recovery of titanium values for recycling.