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1. 发明授权

US3642511A Method of treating wollastonite with acid and the pigment product formed thereby 失效
标题翻译：用酸处理花生沸石的方法和形成的颜料产品
公开(公告)号：US3642511A
公开(公告)日：1972-02-15
申请号：US3642511D
申请日：1970-03-12
申请人： MORRIS I COHN , ROY D PERDUE , ELLIOT E ROSENBERG
发明人： COHN MORRIS I , PERDUE ROY D , ROSENBERG ELLIOT E
IPC分类号： C09C1/28 , D21H17/67 , C09C1/02 , C09C1/30
CPC分类号： D21H17/67 , B82Y30/00 , C01P2002/02 , C01P2004/03 , C01P2004/50 , C01P2004/61 , C01P2004/62 , C01P2004/64 , C01P2004/80 , C01P2006/10 , C01P2006/21 , C01P2006/60 , C09C1/28
摘要： A novel method of producing from wollastonite finely divided pigments and fillers of unusually high opacifying power, high brightness, low bulk density and low abrasiveness for use in paper, paint and other products by reacting the wollastonite in the form of a slurry with sulfuric acid, preferably at an elevated temperature, to form calcium sulfate pigment particles and to solubilize at least part of the silica in the wollastonite, followed by raising the pH of the slurry to gelate the solubilized silica and form agglomerates or aggregates of the calcium sulfate particles and the silica gel, followed by dewatering and drying under noncalcining conditions. The final state of pigment particle aggregation and stabilization of the pigment aggregates is important in imparting high surface hiding power. In a preferred embodiment, the wollastonite slurry is reacted with less than stoichiometric quantities of phosphoric acid at an elevated temperature prior to reaction with the sulfuric acid. Preferably, the reaction product is subjected to high shear, e.g. by passage through a homogenizing valve, and/or a hydroclassifying step, e.g. a hydrocyclone, to complete reaction and hydration and to reduce abrasiveness.
摘要翻译：通过使浆料形式的硅灰石与硫酸反应，生成由硅灰石细分散的颜料和非常高的不透明度，高亮度，低堆积密度和低磨损性的填料制成的新型方法，用于纸，油漆和其它产品，优选在升高的温度下，形成硫酸钙颜料颗粒并溶解至硅灰石中的二氧化硅的至少一部分，随后提高浆料的pH以使溶解的二氧化硅凝胶化并形成硫酸钙颗粒的聚集体或聚集体硅胶，然后在非煅烧条件下脱水和干燥。色素颗粒聚集和稳定颜料聚集体的最终状态在赋予高表面遮盖力方面是重要的。在优选的实施方案中，在与硫酸反应之前，将硅灰石浆料与低于化学计量的磷酸在升高的温度下反应。

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