| 摘要 |
<p>The invention relates to a method for preparing a mixed pigment of calcium carbonate and silica, useful as a filler for paper. In accordance with the method, lime milk and an aqueous sodium silicate solution are admixed and the temperature of the mixture is raised to 55-170 °C, and thereafter carbon dioxide is supplied to the mixture until the pH of the mixture falls to 7 or below, thus precipitating a mixed pigment comprising calcium carbonate and silica.</p> |
