초록 ▼

A method for processing recycling mill sludge into pulp, and cellulosic products made from such pulp, is described. The method for forming cellulosic pulp comprises first forming an aqueous composition in a pulper comprising recycling mill sludge, caustic agent, bleaching agent and a chelating agent

A method for processing recycling mill sludge into pulp, and cellulosic products made from such pulp, is described. The method for forming cellulosic pulp comprises first forming an aqueous composition in a pulper comprising recycling mill sludge, caustic agent, bleaching agent and a chelating agent. The aqueous composition also preferably includes a deinking agent and sodium silicate. The composition is then processed in the pulper for a period of time sufficient to form pulp from recycling mill sludge. The disclosure also describes a method for forming cellulosic products. The method comprises forming a cellulosic pulp from recycling mill sludge, and thereafter forming cellulosic products from the pulp. The method for forming cellulosic products may further comprise forming a pulp mixture comprising from about 1 to about 40 percent pulp from recycled materials and recycling mill sludge, and from about 99 to about 60 percent virgin pulp. The pulp from recycled materials and recycling mill sludge may comprise from about 1 to about 100 percent by weight pulp from recycling mill sludge, with any remaining portion of the pulp mixture comprising pulp produced from post-consumer recycled material.

대표청구항 ▼

[ We claim:] [1.] A method for making a cellulosic pulp comprising cellulosic fibers from recycling mill sludge produced by another mill, the method comprising the steps of:providing recycling mill sludge comprising cellulosic fibers, ink, and a heavy metal;adding water and at least one chelating ag

[ We claim:] [1.] A method for making a cellulosic pulp comprising cellulosic fibers from recycling mill sludge produced by another mill, the method comprising the steps of:providing recycling mill sludge comprising cellulosic fibers, ink, and a heavy metal;adding water and at least one chelating agent to the recycling mill sludge, wherein the chelating agent chelates the heavy metal in the recycling mill sludge, thereby producing an aqueous composition having a consistency that is suitable for processing in a pulper; andprocessing the aqueous composition in the pulper for a period of time sufficient to form a pulp comprising the cellulosic fibers from the recycling mill sludge.