GYPSUM PRODUCT AND PROCESS FOR ITS PREPARATION
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    发明申请
    GYPSUM PRODUCT AND PROCESS FOR ITS PREPARATION 审中-公开
    GYPSUM产品及其制备方法

    公开(公告)号:US20100062255A1

    公开(公告)日:2010-03-11

    申请号:US12525129

    申请日:2008-02-01

    IPC分类号: C01F11/46 C04B11/06 C04B14/02

    摘要: The invention relates to a gypsum product which consists of essentially intact crystals having a size of between 0.1 and below 2.0 μm. The product is especially suitable as a coating pigment or filler in paper manufacture. The invention also relates to a process for the preparation of a gypsum product, wherein calcium sulphate hemihydrate and/or calcium sulphate anhydrite, water and a crystallization habit modifier are contacted so that the calcium sulphate hemihydrate and/or calcium sulphate anhydrite and the water are reacted with each other and form a crystalline gypsum product. The calcium sulphate hemihydrate and/or calcium sulphate anhydrite is/are used in such an amount that the reaction mixture formed from the calcium sulphate hemihydrate and/or calcium sulphate anhydrite, the water and the crystallization habit modifier has a dry matter content of between 50 and 84% by weight. Then, said gypsum product can be formed which consists of essentially intact crystals having a size of between 0.1 and below 2.0 μm.

    摘要翻译: 本发明涉及一种由基本上完整的晶体组成的石膏产品,其尺寸为0.1至小于2.0μm。 该产品特别适用于纸张制造中的涂料颜料或填料。 本发明还涉及一种制备石膏制品的方法,其中硫酸钙半水合物和/或硫酸钙无水石膏,水和结晶习性调节剂接触,使得硫酸钙半水合物和/或硫酸钙无水石膏和水是 彼此反应并形成结晶石膏产品。 硫酸钙半水合物和/或硫酸钙无水石膏的使用量使得由硫酸钙半水合物和/或硫酸钙无水石膏形成的反应混合物,水和结晶习性改性剂的干物质含量为50 和84重量%。 然后,可以形成所述石膏制品,其由尺寸为0.1至小于2.0μm的基本上完整的晶体组成。