METHOD FOR PRODUCING CALCIUM CARBONATE FOR LOADING MATERIAL

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 materia...

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Bibliographische Detailangaben
Hauptverfasser:	UNNO YOSHIO, OSOGOSHI HISAO, ANDO TORU, SADA SHUICHI
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS IMPREGNATING OR COATING OF PAPER INORGANIC CHEMISTRY METALLURGY PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRODUCTION OF CELLULOSE PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS PULP COMPOSITIONS REGENERATION OF PULPING LIQUORS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TEXTILES TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
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Beschreibung
Zusammenfassung:	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 1-6 μm mean particle diameter.