METHOD FOR PRODUCING CALCIUM CARBONATE FOR LOADING MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a method for producing calcium carbonate effectively utilizable as loading material for papermaking by using lime sludge by-produced in a causticizing step in production of kraft digested pulp. SOLUTION: This method for producing calcium carbonate for loading material comprises dispersing solid lime sludge obtained in a causticizing step in production of kraft digested pulp into water, adjusting its concentration to 20-70 wt.% and wet-grinding the resultant to have 1-6μm mean particle diameter.