| 摘要 |
<p>A method for producing calcium carbonate in a cubic form, which comprises providing a carbonate solution and a calcium solution, at least one of which contains a buffering agent dissolved therein, adding dropwise the carbonate solution into the calcium solution or the calcium solution into the carbonate solution, with mixing, to effect a calcium carbonate forming reaction, allowing to stand or agitating the resultant calcium carbonate suspension or a diluted solution thereof for a period of one hour or more, optionally with worming or the like, to thereby remove an ammonium, an alkali metal and a halide ion, and adding a water-soluble salt or acid capable of reacting with calcium and forming a salt being not soluble or hard to soluble in water in a step after calcium carbonate formation. The method enables the production of a calcium carbonate in a cubic form which is almost free from secondary agglomeration, is excellent in the dispersibility of respective particles, uniformity, the stability at a high temperature and the stability after the elapse of a long period of time, and further has a reduced content of impurities.</p> |
