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CALCITE TYPE CALCIUM CARBONATE FILLER AND MANUFACTURE
CALCITE TYPE CALCIUM CARBONATE FILLER AND MANUFACTURE
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机译:钙型碳酸钙充填机及其制造
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摘要
1. Calcitic calcium carbonate filler in needle, fibre and/or rod form, having a specific BET surface area of 15-200 m**2 /g, an average shape factor of 5 and having a phosphate content of 2.5-25% by weight, calculated as PO4-3- and based on calcium carbonate, and prepared by precipitation of an aqueous 3-25% strength by weight calcium hydroxide suspension using carbon dioxide, if appropriate mixed with air or nitrogen, at temperatures of from 0-25 degrees C, where 3-25% by weight, based on the calcium hydroxide employed, of PO4-3- being added in the form of Ha Me3-a PO4 (a = 0-3; Me = H, NH4-+ (a Not= 0), Na**+ , or K**+ ) before commencement of the pH decrease, thorough mixing being ensured during the entire reaction, and, if appropriate, the finished product, being dried and/or coated in a known manner.
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机译:1.针状,纤维状和/或棒状的钙质碳酸钙填料,BET比表面积为15-200 m ** 2 / g,平均形状系数> 5,磷酸盐含量为2.5-25% (重量),以PO4-3-计算,并以碳酸钙为基础,并通过将二氧化碳浓度为3-25%(重量)的氢氧化钙悬浮液在0- 25°C,其中基于所用氢氧化钙为3-25%的PO4-3-以Ha Me3-a PO4(a = 0-3; Me = H,NH4- +(在pH降低开始之前a Not = 0),Na ** +或K ** +),确保在整个反应过程中充分混合,如果合适的话,将成品干燥和/或包衣已知的方式。
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