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    • 1. 发明授权
    • Process for obtaining precipitated calcium carbonate
    • 沉淀碳酸钙的制备方法
    • US08999284B2
    • 2015-04-07
    • US13635928
    • 2011-03-31
    • Michael PohlChristian RainerGernot Primosch
    • Michael PohlChristian RainerGernot Primosch
    • C01F11/18
    • C01F11/181C01F11/18C01F11/182C01P2002/30C01P2004/10C01P2004/62C01P2006/12Y10T428/2982
    • The present invention provides a process for preparing a precipitated calcium carbonate product. The process comprises the steps of preparing an aqueous suspension of precipitated calcium carbonate seeds by carbonating a suspension of Ca(OH)2 in the presence of 0.005 to 0.030 moles of Sr, in the form of Sr(OH)2, based upon moles of Ca(OH)2 prior to or during carbonation; forming an aqueous suspension of a precipitated calcium carbonate product by carbonating a slurry of Ca(OH)2 in the presence of 0.5 to 5% by dry weight of the precipitated calcium carbonate seeds, wherein the precipitated calcium carbonate seeds have a D50 that is less than the D50 of the precipitated calcium carbonate product and the precipitated calcium carbonate seeds have an aragonitic polymorph content greater than or equal to the precipitated calcium carbonate product.
    • 本发明提供了制备沉淀碳酸钙产品的方法。 该方法包括以下步骤:通过在Sr(OH)2形式的0.005至0.030摩尔Sr存在下,以Ca(OH)2的摩尔数为基础,将Ca(OH)2的悬浮液碳酸化,制备沉淀碳酸钙种子的水悬浮液, 碳酸化之前或期间的Ca(OH)2; 通过在0.5-5%(重量)沉淀碳酸钙种子的存在下碳酸化Ca(OH)2的浆液,形成沉淀的碳酸钙产物的水性悬浮液,其中沉淀的碳酸钙种子具有较少的D50 比沉淀碳酸钙产品的D50和沉淀碳酸钙种子具有大于或等于沉淀碳酸钙产品的文石多晶型物质。