Method for producing high brightness low abrasion calcined kaolin pigment
    1.
    发明授权
    Method for producing high brightness low abrasion calcined kaolin pigment 失效
    高亮度低磨耗煅烧高岭土颜料的制造方法

    公开(公告)号:US5522924A

    公开(公告)日:1996-06-04

    申请号:US405610

    申请日:1995-03-17

    IPC分类号: B03B9/00 C09C1/42 C04B33/04

    摘要: A process for preparing a high brightness, low abrasion calcined kaolin. A cretaceous crude is wet beneficiated by subjecting same as an aqueous slurry to degritting, classification, magnetic separation, and scrub grinding. The slurry from the foregoing is diluted to less than 15% solids and subjected while well dispersed to a separation in a centrifuge to yield an underflow and an overflow fine fraction having less than 5% solids and a P.S.D. such that at least 85% by weight are of

    摘要翻译: 制备高亮度低磨耗煅烧高岭土的方法。 通过对含水浆料进行脱灰,分级,磁分离和擦洗研磨,使白垩纪粗品湿化。 将来自上述物质的浆液稀释至小于15%的固体,并在良好分散以在离心机中分离以产生底流和具有小于5%固体含量和P.S.D的上溢精细级分。 使得至少85重量%为<0.5μmE.S.D。 并且至少30重量%为<0.25μmE.S.D. 将分散的高岭土的溢流精细级分浆料经过部分过滤,通过与基本上没有悬浮高岭土颗粒通过的微孔膜交叉流动,将所述浆料的固体含量提高至至少20% 。 该浆液以干重为基准,以细粒度的三级高岭土的浆料为基准组合,然后漂白,絮凝和过滤,得到滤饼,将其重新分散,干燥并研磨,得到煅烧炉 饲料。 进料在高于高岭土放热的温度下煅烧,得到亮度至少为92并且Einleiner Abrasion小于24的煅烧产品。