To provide a method for efficiently obtaining calcium carbonate having good grindability and suitable as a coating pigment, in a method for producing calcium carbonate in a causticizing process of a pulp production process by a sulfate method or a soda method.
The causticized light calcium carbonate having improved grindability can be obtained by using the mixture of quicklime produced in a causticizing process and quicklime supplied from the outside or only the quicklime supplied from the outside as a raw quicklime, and (i) blending the quicklime so that the blending ratio of the quicklime supplied from the outside is 50-100 wt.% of the total blending weight of the quicklime, and (ii) defining the average primary particle diameter of the quicklime supplied from the outside as ≤3 μm.
COPYRIGHT: (C)2009,JPO&INPIT
Toshimichi Ofuji
Masato Takayama
Yoshii Yamada
Takehiro Kojima
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Akio Chiba
Hiroyuki Tomita
Mitsutoshi Nakamura