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    • 6. 发明授权
    • Method for manufacturing spherical silica from olivine
    • 从橄榄石制造球形二氧化硅的方法
    • US5780005A
    • 1998-07-14
    • US602772
    • 1996-03-04
    • Svein Olerud
    • Svein Olerud
    • C01B33/18C01B33/187C01B33/12
    • B82Y30/00C01B33/187C01P2004/32C01P2004/50C01P2004/64C01P2006/10C01P2006/12C01P2006/14C01P2006/16C01P2006/60C01P2006/80
    • In a method for manufacturing silica a leaching of natural silicates is performed with hydrochloric acid or other mineral acids, draining, drying and possibly a grinding up of the residue of the product obtained. In order to obtain a spherical silica with a controlled particle size and surface characteristics a mineral olivine with the highest possible degree of purity is employed as the basic material. This raw material is reduced to a grain size between 0.05 and 5 mm. The particles are pretreated and washed for the removal of dust on the grain surfaces and heavy materials such as spinel and at least a part of the foliar and stem-like minerals such as serpentine, talc and pyroxene are removed. The olivine particles are then leached in a controlled leaching process where the acid concentration, leaching temperature and leaching time are controlled in order to achieve the desired primary particle size, specific surface and pore volume measured according to the BET method on the extracted silica. The particle agglomerate of spherical particles thus formed with a grain size between 30 and 70 nanometers are washed and dried in the conventional manner, whereupon the agglomerate is divided into the spherical particles.
    • PCT No.PCT / NO94 / 00145 Sec。 371日期:1996年3月4日 102(e)1996年3月4日PCT 1994年9月1日PCT PCT。 公开号WO95 / 07235 日期:1995年3月16日在二氧化硅的制造方法中,天然硅酸盐的浸出是用盐酸或其他无机酸进行的,排出,干燥和可能磨碎所得产品的残余物。 为了获得具有受控粒度和表面特性的球形二氧化硅,采用具有最高纯度的矿物橄榄石作为基础材料。 将该原料还原成0.05〜5mm的粒径。 颗粒被预处理并洗涤以去除颗粒表面上的灰尘,并且重要材料如尖晶石和至少一部分叶面和茎状矿物如蛇纹石,滑石和辉石被去除。 然后在受控浸出过程中浸出橄榄石颗粒,其中控制酸浓度,浸出温度和浸出时间,以获得根据提取的二氧化硅上的BET法测量的所需的一次粒径,比表面积和孔体积。 将由此形成的粒径在30和70纳米之间的球形颗粒的颗粒聚集体以常规方式洗涤和干燥,由此将附聚物分成球形颗粒。