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    • 7. 发明公开
    • Precipitated calcium carbonate from pulp mill waste having an improved brightness, method for the production and use thereof
    • 石灰tem tem tem en en en en en en en en en en en en en en en en en en
    • EP2524898A1
    • 2012-11-21
    • EP11166216.9
    • 2011-05-16
    • Omya Development AG
    • Pohl, MichaelSchmölzer, Thomas
    • C01B31/24C01F11/18
    • C01F11/185B82Y30/00C01B32/60C01F5/24C01F11/18C01F11/181C01P2004/03C01P2004/52C01P2004/61C01P2004/62C01P2004/64C01P2004/84C01P2006/12C01P2006/22C01P2006/60C08K2003/265C09C1/021C09D7/61C09D7/67C09D7/68
    • The present invention relates to a process for the production of a precipitated divalent metal ion carbonate product from a divalent metal ion carbonate which was recovered from waste, the precipitated divalent metal ion carbonate product having an improved brightness, the process comprising the steps of: providing a low-purity divalent metal ion carbonate material, the divalent metal ion carbonate material being recovered from waste; calcining the divalent metal ion carbonate material in order to obtain a divalent metal ion oxide; slaking the divalent metal ion oxide in order to obtain an aqueous suspension of a divalent metal ion hydroxide; carbonating the aqueous suspension of the divalent metal ion hydroxide with a carbon dioxide containing compound in order to obtain fine precipitated divalent metal ion carbonate particles; post-treating the fine precipitated divalent metal ion carbonate particles to obtain fine discrete precipitated divalent metal ion carbonate particles; adding the fine discrete precipitated divalent metal ion carbonate particles to an aqueous suspension of divalent metal ion hydroxide that was obtained by slaking high-purity divalent metal ion hydroxide in order to obtain a resulting reaction mixture; and carbonating the resulting reaction mixture in order to obtain the precipitated divalent metal ion carbonate product having an improved brightness.
    • 本发明涉及从废物中回收的二价金属离子碳酸盐生产沉淀的二价金属离子碳酸盐产物的方法,所述沉淀的二价金属离子碳酸盐产物具有改进的亮度,所述方法包括以下步骤:提供 低纯度二价金属离子碳酸盐材料,从废物中回收二价金属离子碳酸盐材料; 煅烧二价金属离子碳酸盐材料以获得二价金属离子氧化物; 制备二价金属离子氧化物以获得二价金属离子氢氧化物的水悬浮液; 用含二氧化碳的化合物碳酸化二价金属离子氢氧化物的水悬浮液,以获得细小的沉淀二价金属离子碳酸盐颗粒; 对微细析出的二价金属离子碳酸盐颗粒进行后处理以获得精细的离散沉淀的二价金属离子碳酸盐颗粒; 将精细离散的沉淀二价金属离子碳酸盐颗粒加入到通过粉碎高纯度二价金属离子氢氧化物而获得的二价金属离子氢氧化物的水悬浮液中,以获得所得到的反应混合物; 并将所得反应混合物碳酸化以获得具有改善的亮度的沉淀的二价金属离子碳酸盐产物。