| 摘要 |
<p>A process is described by means of which it is possible to prepare stable, basic calcium carbonate of determinable crystal structure on a large industrial scale. The process according to the invention is distinguished by the fact that an aqueous suspension of calcium hydroxide is carbonatised by addition of CO2, defined temperatures of the suspension in the range from 2 to 50 DEG C are maintained during this carbonatisation, and the carbonatisation is then completed at a molar calcium carbonate ratio of 3 : 2 or 6 : 5. Depending on the initial temperature of the suspension, platelet-like, rod-like or fibrous calcium carbonate, calcium carbonate of somatoidal crystal form or even basic calcium carbonate having comparatively large rhombohedra are obtained. The products obtained by the process according to the invention, to which the invention is also directed, are, owing to their structure, suitable in particular for the use in paper production, for emulsion paints, fillers for plastics, rubber, synthetic resins, etc. <IMAGE></p> |
