LIGHT CALCIUM CARBONATE, METHOD FOR PRODUCTION THEREOF AND LOADING MATERIAL FOR LOADING INTO PAPER

LIGHT CALCIUM CARBONATE, METHOD FOR PRODUCTION THEREOF AND LOADING MATERIAL FOR LOADING INTO PAPER

Carbon dioxide containing gas is blown into a calcium hydroxide slurry having a calcium hydroxide concentration of 100 to 400 g/L obtained by wet slaking calcined lime with 4 N hydrochloric acid activity (value at 3 minutes) of 150 to 400 mL to allow them to react until the carbonation rate becomes...

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Bibliographische Detailangaben
Hauptverfasser: SHIMONO, KAZUHISA, TAKANO, TATSUO, KAWAZU, TORU, YAMASHITA, KAZUO
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
CHEMISTRY
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS
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
PULP COMPOSITIONS
TEXTILES
TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
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Beschreibung
Zusammenfassung:Carbon dioxide containing gas is blown into a calcium hydroxide slurry having a calcium hydroxide concentration of 100 to 400 g/L obtained by wet slaking calcined lime with 4 N hydrochloric acid activity (value at 3 minutes) of 150 to 400 mL to allow them to react until the carbonation rate becomes 50 to 85%, then 1 to 20% by volume of the calcium hydroxide slurry is added, and carbon dioxide containing gas is further blown in to terminate the reaction. The calcium carbonate obtained by this method is precipitated calcium carbonate aggregates having a secondary particle diameter of 1 to 10 µm and consisting of primary particles having a long diameter of 0.5 to 3.0 µm, a short diameter of 0.1 to 1.0 µm and an aspect ratio of less than 3, has superior characteristics due to a BET specific surface area in the range of 8 to 20 m 2 /g and a pore volume in the range of 1.5 to 3.5 cm 3 /g, can be uniformly dispersed in pulp fiber, and thereby can be used to manufacture high bulk paper.