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    Preparation of acicular gamma-iron(III) oxide of high coercive force
    6.
    发明授权
    Preparation of acicular gamma-iron(III) oxide of high coercive force 失效
    制备高矫顽力的针状γ-铁（III）氧化物

    公开(公告)号：US4362708A

    公开(公告)日：1982-12-07

    申请号：US320014

    申请日：1981-11-10

    申请人： Manfred Ohlinger ,  Hans Reichert ,  Guenter Vaeth ,  Friedrich R. Faulhaber ,  Horst Autzen ,  Peter Rudolf ,  Joachim Werther

    发明人： Manfred Ohlinger ,  Hans Reichert ,  Guenter Vaeth ,  Friedrich R. Faulhaber ,  Horst Autzen ,  Peter Rudolf ,  Joachim Werther

    IPC分类号： C01G49/02 ,  C01G49/06 ,  G11B5/706 ,  H01F1/11

    CPC分类号： G11B5/70663 ,  C01G49/06 ,  C01P2004/10 ,  C01P2006/12 ,  C01P2006/42

    摘要： A process for the preparation of acicular gamma-iron(III) oxide of high coercive force by reducing acicular iron(III) oxide hydroxide, as it is being passed continuously through a furnace having two or more heating zones at from 190.degree. to 700.degree. C., by means of a gas mixture which is produced by passing a stream of inert gas, heated to above 250.degree. C., through an organic substance also heated to above 250.degree. C. in a vessel, and, on introduction into the furnace, is first brought into contact with the .alpha.-iron(III) oxide formed from the iron(III) oxide hydroxide by elimination of water in the first heating zone of the furnace at from 190.degree. to 250.degree. C., the .alpha.-iron(III) oxide thereby being converted to magnetite which is subsequently oxidized with an oxygen-containing gas at from 150.degree. to 400.degree. C., to give gamma-iron(III) oxide.

    摘要翻译： 一种通过还原针状氧化铁（III）氢氧化物制备高矫顽力的针状γ-铁（III）氧化物的方法，因为它连续通过具有两个或多个加热区的炉子在190℃至700℃ 通过将加热至高于250℃的惰性气体流通过容器中也被加热至高于250℃的有机物质，并通过引入到 炉子首先通过在190℃至250℃的炉的第一加热区中消除水而与由氧化铁（III）氧化物形成的α-铁（III）氧化物接触， 氧化铁（III），从而转化为磁铁矿，随后在150-400℃下用含氧气体氧化，得到氧化三氯化铁（III）。

    Manufacture of gamma-iron(III) oxide
    9.
    发明授权
    Manufacture of gamma-iron(III) oxide 失效
    制造γ-铁（III）氧化物

    公开(公告)号：US4061725A

    公开(公告)日：1977-12-06

    申请号：US732899

    申请日：1976-10-15

    申请人： Manfred Ohlinger ,  Eduard Schoenafinger ,  Walter Schneider ,  Heinz Stritzinger ,  Guenter Vaeth

    发明人： Manfred Ohlinger ,  Eduard Schoenafinger ,  Walter Schneider ,  Heinz Stritzinger ,  Guenter Vaeth

    IPC分类号： C01G49/06 ,  G11B5/706 ,  H01F1/10 ,  H01F1/11 ,  C01G49/02

    CPC分类号： G11B5/70652 ,  C01G49/06 ,  G11B5/70647 ,  C01P2002/52 ,  C01P2004/10 ,  C01P2006/11 ,  C01P2006/42

    摘要： Acicular gamma-iron(III) oxide is manufactured by reacting an iron(II) salt solution with an aqueous solution of an alkali metal hydroxide and oxidizing the resulting suspension of iron(II) hydroxide in three stages. In a first stage, at most from 0.1 to 4% by weight of the amount of iron(II) hydroxide originally present is oxidized in the course of from 0.1 to 4 hours, in a second stage from 10 to 25% by weight of the said original amount are oxidized in the course of from 1.5 to 6 hours and in a third stage the remaining amount is oxidized. After the oxidation, the goethite formed is reduced to magnetite and the latter is then oxidized to acicular gamma-iron(III) oxide.

    摘要翻译： 通过使铁（II）盐溶液与碱金属氢氧化物的水溶液反应并将所得的氢氧化铁（II）悬浮液分三个阶段进行氧化，从而制造针状γ-铁（III）。 在第一阶段中，最初存在的氢氧化铁（II）的量的0.1至4重量％在0.1至4小时的过程中被氧化，在第二阶段中氧化为10至25重量％ 所述原始量在1.5至6小时的过程中被氧化，在第三阶段中剩余量被氧化。 氧化后，形成的针铁矿被还原成磁铁矿，后者被氧化成针状的γ-铁（III）氧化物。

    Process for the manufacture of ferromagnetic chromium dioxide
    10.
    发明授权
    Process for the manufacture of ferromagnetic chromium dioxide 失效
    制造铁磁性二氧化铬的工艺

    公开(公告)号：US4340494A

    公开(公告)日：1982-07-20

    申请号：US199347

    申请日：1980-10-21

    申请人： Manfred Ohlinger ,  Guenter Vaeth ,  Norbert Mueller ,  Eugen Wettstein

    发明人： Manfred Ohlinger ,  Guenter Vaeth ,  Norbert Mueller ,  Eugen Wettstein

    IPC分类号： C01G37/00 ,  C01G37/027 ,  G11B5/706 ,  H01F1/11 ,  H01F1/36

    CPC分类号： C01G37/027 ,  G11B5/70636 ,  C01P2006/11 ,  C01P2006/12 ,  C01P2006/42 ,  C01P2006/80

    摘要： A process for the manufacture of ferromagnetic chromium dioxide modified with foreign elements, by reacting oxides of trivalent and hexavalent chromium under superatmospheric pressure at an elevated temperature in the presence of water and of antimony(III) oxide as modifier, with or without other modifiers in an amount not exceeding 15% by weight, wherein the antimony(III) oxide employed as modifier is, to the extent of more than one-third, present as the senarmontite cubic modification, has a specific surface area, measured by the BET method, of from 1.5 to 15 m.sup.2 /g, and is added in a total amount of up to 0.5% by weight, based on the resulting chromium dioxide.

    摘要翻译： 在高温和高温下，在水和氧化锑（III）作为改性剂的情况下，通过使三价铬和六价铬的氧化物与三元和六价铬的氧化物反应来制造用异质元素改性的铁磁性二氧化铬的方法， 其量为不超过15重量％，其中用作改性剂的锑（III）氧化物的比表面积，通过BET法测定的比表面积为三分之一以上， 为1.5〜15m 2 / g，相对于所得到的二氧化铬，添加量为0.5重量％以下。