METHOD FOR PRODUCING SILICA COMPOSITE RECLAIMED PARTICLE, AND SILICA COMPOSITE RECLAIMED PARTICLE

摘要

PROBLEM TO BE SOLVED: To provide a method for producing reclaimed particles capable of obtaining easily and stably reclaimed particle in which problems of hardening and low whitening, or problems of thickening-solidification when being changed into slurry are solved.SOLUTION: In the method for producing silica composite reclaimed particles R for producing reclaimed particles by subjecting papermaking sludge S to dehydration (10) and heat treatment (30), and compounding (60) silica into the reclaimed particles, deinked floss discharged in a production step of a pulp of a used newspaper is used as a main raw material of the papermaking sludge S.