Removing coloring particle, preferably printing ink particle from a fiber material comprises dissolving fiber material to form a suspension, adding calcium hydroxide and carbon dioxide into the suspension and removing the coloring particle

摘要

Method for removing coloring particle from a fiber material comprises: dissolving the fiber material for the formation of fiber material suspension; adding calcium hydroxide in a liquid- or dry-form to the fiber material during or before dissolving the fiber material; adding carbon dioxide into the fiber material suspension for the formation of coloring particle bound calcium carbonate; and removing the coloring particle from the fiber material suspension.