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    Process for producing granular hematite particles
    6.
    发明授权
    Process for producing granular hematite particles 失效

    公开(公告)号：US06616747B2

    公开(公告)日：2003-09-09

    申请号：US10112058

    申请日：2002-04-01

    申请人： Hiroshi Sumita

    发明人： Hiroshi Sumita

    IPC分类号： C09C122

    CPC分类号： B82Y30/00 ,  C01G49/06 ,  C01P2004/50 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2006/19 ,  C01P2006/60 ,  C01P2006/62 ,  C01P2006/63 ,  C01P2006/64 ,  C01P2006/66 ,  C01P2006/80 ,  C01P2006/82 ,  C09C1/24

    摘要： The process for producing granular hematite particles of the present invention, comprises passing an oxygen-containing gas through an aqueous ferrous nitrate solution in the presence of iron materials and hematite seed crystals at a temperature of 80 to 90° C., thereby obtaining reddish brown precipitates containing granular hematite particles as a main component; subjecting the reddish brown precipitates to filtration, water-washing and then drying; and heat-treating the reddish brown precipitates in air at a temperature of 450 to 900° C. In accordance with the process of the present invention, the granular hematite particles exhibiting a high purity, a small equilibrium water content and a reduced oil absorption can be produced using inexpensive iron raw materials without use of a specific device such as autoclave in an industrially and economically useful manner.

    Yellow iron oxide hydroxide particles and process for producing the same
    10.
    发明授权
    Yellow iron oxide hydroxide particles and process for producing the same 失效
    黄铁氧化物氢氧化物颗粒及其制备方法

    公开(公告)号：US6027559A

    公开(公告)日：2000-02-22

    申请号：US102054

    申请日：1998-06-22

    申请人： Hiroko Morii ,  Mineko Ohsugi ,  Kazuyuki Hayashi ,  Hiroshi Sumita

    发明人： Hiroko Morii ,  Mineko Ohsugi ,  Kazuyuki Hayashi ,  Hiroshi Sumita

    IPC分类号： C08K9/02 ,  C09C1/24 ,  C01G49/06

    CPC分类号： B82Y30/00 ,  C08K9/02 ,  C09C1/24 ,  C01P2004/03 ,  C01P2004/50 ,  C01P2004/51 ,  C01P2004/54 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2004/84 ,  C01P2006/12 ,  C01P2006/60 ,  C01P2006/62 ,  C01P2006/63 ,  C01P2006/64 ,  C01P2006/66 ,  C01P2006/80 ,  Y10T428/2991

    摘要： Yellow iron oxide hydroxide particles comprising:iron oxide hydroxide particle as a core, andcomposite oxide hydroxide of Fe and Al deposited on surface of said iron oxide hydroxide particle as a core wherein the amount of Al in said composite oxide hydroxide is 0.1 to 10% by weight, calculated as Al, based on the weight of said iron oxide hydroxide as a core, the amount of Fe in said composite oxide hydroxide is 0.1 to 50% by weight, calculated as Fe, based on the weight of said iron oxide hydroxide particle as a core, and the ratio of Al to Fe in said composite oxide hydroxide is 0.05:1 to 2:1, calculated as Al and Fe atoms,said yellow iron oxide hydroxide particles having an average major axis diameter of 0.1 to 1.0 .mu.m, an average minor axis diameter of 0.02 to 0.10 .mu.m, an aspect ratio (major axis diameter/minor axis diameter) of 2 to 20, a BET specific surface area of 10 to 180 m.sup.2 /g and a heat-resistance temperature of not less than 255.degree. C. Such yellow iron oxide hydroxide particles not only have an excellent dispersibility and a further improved heat resistance but also exhibit less change in hue between before and after treatment for improving the heat resistance, and a process for producing such particles.

    摘要翻译： 黄铁氧化物氢氧化物颗粒包含：以铁氧化物氢氧化物颗粒为核心的铁氧化物氢氧化物颗粒的表面上沉积的Fe和Al的复合氧化物氢氧化物，其中所述复合氧化物氢氧化物中的Al的量为0.1至10％ ，以所述铁氧化物氢氧化物为核心的重量计算，所述复合氧化物氢氧化物中的Fe的量以Fe计算为0.1-50重量％，以所述铁氧化物氢氧化物的重量为基准 粒子为核心，所述复合氧化物氢氧化物中的Al与Fe的比例为Al：Fe和Fe原子计为0.05:1〜2:1，所述黄铁氧化物氢氧化物粒子的平均长轴直径为0.1〜1.0μm m，平均短轴直径为0.02〜0.10μm，纵横比（长轴径/短轴直径）为2〜20，BET比表面积为10〜180m 2 / g，耐热温度为 不低于255℃。这种黄色氧化铁的氢氧化物 e颗粒不仅具有优异的分散性和进一步改善的耐热性，而且在改善耐热性之前和之后表现出较少的色调变化，以及制备这种颗粒的方法。