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    Process for producing granular hematite particles
    2.
    发明申请
    Process for producing granular hematite particles 失效
    颗粒状赤铁矿颗粒的生产方法

    公开(公告)号：US20030051636A1

    公开(公告)日：2003-03-20

    申请号：US10112058

    申请日：2002-04-01

    发明人： Hiroshi Sumita

    IPC分类号： C09C001/22 ,  C01G049/02

    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 90null 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 900null 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.

    摘要翻译： 本发明的颗粒状赤铁矿颗粒的制造方法包括在80〜90℃的温度下，在铁物质和赤铁矿晶种的存在下，使含氧气体通过硝酸亚铁水溶液，使得得到红棕色 含有颗粒状赤铁矿颗粒的沉淀物为主要成分; 使红棕色沉淀物过滤，水洗，然后干燥; 在450〜900℃的温度下，在空气中热处理红褐色的沉淀物。根据本发明的方法，显示纯度高，平衡含水量小，吸油率降低的粒状赤铁矿颗粒 使用廉价的铁原料，以工业和经济上有用的方式使用高压釜等特定装置。

    Process for producing magnetite particles
    5.
    发明申请
    Process for producing magnetite particles 有权
    生产磁铁矿颗粒的方法

    公开(公告)号：US20020130296A1

    公开(公告)日：2002-09-19

    申请号：US10047315

    申请日：2002-01-14

    发明人： Ulrich Meisen

    IPC分类号： C01G049/02

    CPC分类号： H01F1/36 ,  C01G49/08 ,  C01P2004/30 ,  C01P2004/41 ,  C01P2004/62 ,  C01P2006/42 ,  C09C1/24

    摘要： This invention relates to a process for producing magnetite particles having a coercivity of 6.366 kA/m to 10.345 kA/m (null80 to 130 Oe) and an octahedral particle shape, comprising heating an alkaline component and an iron(II) component in the form of an aqueous solution to a temperature of 50null C. to 100null C., whereby the molar ratio of iron(II) component to one equivalent of alkaline component is 0.38 to 0.45, and treating the suspension with an oxidizing agent at a rate of oxidation of 20 to 50 mol. % Fe(II)/h until the iron compound has an Fe(III) content of more than 65 mol. %, and then again adding an Fe(II) component in the form of an aqueous solution at a molar ratio of Fe(II) to one equivalent of total alkaline component used is 0.47 to 0.49, and treating the suspension with an oxidizing agent, at a rate of oxidation is 20 to 50 mol. % Fe(II)/h until the iron compound has an Fe(III) content of more than 65 mol. %, and filtering the suspension, and washing, drying and grounding the residue.

    摘要翻译： 本发明涉及矫顽磁力为6.366kA / m至10.345kA / m（= 80-130Oe）和八面体颗粒形状的磁铁矿颗粒的制造方法，包括加热碱性组分和铁（II）组分 形式的水溶液至50℃至100℃，由此铁（II）组分与一当量碱性组分的摩尔比为0.38至0.45，并用氧化剂处理悬浮液 氧化速率为20〜50 mol。 ％Fe（II）/ h，直到铁化合物的Fe（III）含量大于65mol。 ％，然后以Fe（II）摩尔比与所使用的全部碱性成分的1当量再次加入水溶液形式的Fe（II）成分为0.47〜0.49，用氧化剂处理悬浮液， 氧化速率为20〜50摩尔。 ％Fe（II）/ h，直到铁化合物的Fe（III）含量大于65mol。 ％，过滤悬浮液，洗涤，干燥和接地残渣。

    Process for producing magnetite particles
    9.
    发明申请
    Process for producing magnetite particles 审中-公开

    公开(公告)号：US20040219095A1

    公开(公告)日：2004-11-04

    申请号：US10863957

    申请日：2004-06-09

    发明人： Ulrich Meisen

    IPC分类号： C01G049/02

    CPC分类号： H01F1/36 ,  C01G49/08 ,  C01P2004/30 ,  C01P2004/41 ,  C01P2004/62 ,  C01P2006/42 ,  C09C1/24

    摘要： This invention relates to a process for producing magnetite particles having a coercivity of 6.366 kA/m to 10.345 kA/m (null80 to 130 Oe) and an octahedral particle shape, comprising heating an alkaline component and an iron(II) component in the form of an aqueous solution to a temperature of 50null C. to 100null C., whereby the molar ratio of iron(II) component to one equivalent of alkaline component is 0.38 to 0.45, and treating the suspension with an oxidizing agent at a rate of oxidation of 20 to 50 mol. % Fe(II)/h until the iron compound has an Fe(III) content of more than 65 mol. %, and then again adding an Fe(II) component in the form of an aqueous solution at a molar ratio of Fe(II) to one equivalent of total alkaline component used is 0.47 to 0.49, and treating the suspension with an oxidizing agent, at a rate of oxidation is 20 to 50 mol. % Fe(II)/h until the iron compound has an Fe(III) content of more than 65 mol. %, and filtering the suspension, and washing, drying and grounding the residue.