Method of producing granular amorphous silica
    1.
    发明授权
    Method of producing granular amorphous silica 失效
    生产颗粒状无定形二氧化硅的方法

    公开(公告)号:US5989510A

    公开(公告)日:1999-11-23

    申请号:US670240

    申请日:1996-06-17

    IPC分类号: C01B33/12 C01B33/193 C09C1/30

    摘要: A method of directly precipitating a spherical amorphous silica in a high yield by adding a carboxymethyl cellulose (CMC) as a coagulation growing agent in a step of neutralizing the alkali silicate with an acid. The CMC having a particular etherification degree and a particular polymerization degree is added in an amount of from 1 to 100% by weight reckoned as SiO.sub.2 with respect to silica in the alkali silicate, whereby the whole silica particles turn into spherical amorphous silica particles having high sphericalness. There can be obtained spherical amorphous silica particles having a BET specific surface area of from 25 to 800 m.sup.2 /g, an apparent specific gravity of from 0.1 to 0.8 and a particle diameter of from 0.2 to 50 .mu.m cheaply and in a high yield.

    摘要翻译: 通过在用酸中和碱金属硅酸盐的步骤中加入羧甲基纤维素(CMC)作为凝结生长剂,以高产率直接沉淀球状无定形二氧化硅的方法。 相对于碱金属硅酸盐中的二氧化硅,具有特定醚化度和特定聚合度的CMC以相对于二氧化硅计为1〜100重量%的量添加,由此整个二氧化硅颗粒变成具有高的 球面度 可以廉价且高收率地得到BET比表面积为25〜800m 2 / g,表观比重为0.1〜0.8,粒径为0.2〜50μm的球状无定形二氧化硅粒子。