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    Process for producing acicular geothite particles and acicular magnetic iron oxide particles
    2.
    发明授权
    Process for producing acicular geothite particles and acicular magnetic iron oxide particles 失效
    生产针状地质颗粒和针状磁性氧化铁颗粒的方法

    公开(公告)号：US5378380A

    公开(公告)日：1995-01-03

    申请号：US22847

    申请日：1993-02-25

    申请人： Masaru Isoai ,  Tosiharu Harada ,  Tokihiro Kurata ,  Kazuhiro Fujita ,  Kazushi Takama ,  Shigekazu Jikuhara

    发明人： Masaru Isoai ,  Tosiharu Harada ,  Tokihiro Kurata ,  Kazuhiro Fujita ,  Kazushi Takama ,  Shigekazu Jikuhara

    IPC分类号： C01G49/06 ,  C01G49/08

    CPC分类号： B82Y30/00 ,  C01G49/06 ,  C01G49/08 ,  C01P2004/03 ,  C01P2004/10 ,  C01P2004/51 ,  C01P2004/54 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2006/42

    摘要： Disclosed herein are a process for producing acicular goethite particles comprising the step of: blowing an oxygen-containing gas into a ferrous salt reaction solution containing colloidal ferrous hydroxide or iron-containing colloidal precipitates which is obtained by reacting an aqueous ferrous salt solution with less than one equivalent of an aqueous alkali hydroxide solution, an aqueous alkali carbonate solution, or an aqueous alkali hydroxide and alkali carbonate solution based on Fe.sup.2+ in said aqueous ferrous salt solution, in the presence of ascorbic acid or a salt thereof so as to oxidize said colloidal ferrous hydroxide or iron-containing colloidal precipitates and to produce acicular goethite particles throught green rust; and a process for producing acicular magnetic iron oxide particles by reducing the acicular goethite particles obtained in the above process to produce acicular magnetite particles, and if necessary, oxidizing the acicular magnetite particles to obtain acicular maghemite particles, and if necessary, modifying the acicular magnetite or maghemite particles with Co or Co and Fe.sup.2+.

    摘要翻译： 本文公开了一种制备针状针铁矿颗粒的方法，包括以下步骤：将含氧气体吹入含有胶态氢氧化亚铁或含铁胶体沉淀物的亚铁盐反应溶液中，该溶液通过使亚铁盐水溶液与小于 一种碱金属氢氧化物水溶液，碱金属碳酸盐水溶液或碱金属氢氧化物和碱金属碳酸盐水溶液中，在所述含水亚铁盐水溶液中，在抗坏血酸或其盐的存在下，氧化所述胶体 含氢氧化铁或含铁胶体沉淀物，并通过绿锈生成针状针铁矿颗粒; 以及通过将上述方法中得到的针状针铁矿粒子还原而制造针状磁性氧化铁粒子的方法，制造针状磁铁矿粒子，根据需要，根据需要氧化针状磁铁矿粒子，得到针状磁赤铁矿粒子，根据需要，对针状磁铁矿 或具有Co或Co和Fe2 +的磁赤铁矿颗粒。

    Process for producing acicular goethite particles and acicular magnetic iron oxide particles
    3.
    发明授权
    Process for producing acicular goethite particles and acicular magnetic iron oxide particles 失效
    制备针状针铁矿颗粒和针状磁性氧化铁颗粒的方法

    公开(公告)号：US5480571A

    公开(公告)日：1996-01-02

    申请号：US309743

    申请日：1994-09-21

    申请人： Masaru Isoai ,  Tosiharu Harada ,  Tokihiro Kurata ,  Kazuhiro Fujita ,  Kazushi Takama ,  Shigekazu Jikuhara

    发明人： Masaru Isoai ,  Tosiharu Harada ,  Tokihiro Kurata ,  Kazuhiro Fujita ,  Kazushi Takama ,  Shigekazu Jikuhara

    IPC分类号： C01G49/06 ,  C01G49/08

    CPC分类号： B82Y30/00 ,  C01G49/06 ,  C01G49/08 ,  C01P2004/03 ,  C01P2004/10 ,  C01P2004/51 ,  C01P2004/54 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2006/42

    摘要： Disclosed herein are a process for producing acicular goethite particles comprising the step off: blowing an oxygen-containing gas into a ferrous salt reaction solution containing colloidal ferrous hydroxide or iron-containing colloidal precipitates which is obtained by reacting an aqueous ferrous salt solution with less than one equivalent of an aqueous alkali hydroxide solution, an aqueous alkali carbonate solution, or an aqueous alkali hydroxide and alkali carbonate solution based on Fe.sup.2+ in said aqueous ferrous salt solution, in the presence of ascorbic acid or a salt thereof so as to oxidize said colloidal ferrous hydroxide or iron-containing colloidal precipitates and to produce acicular goethite particles throught green rust; and a process for producing acicular magnetic iron oxide particles by reducing the acicular goethite particles obtained in the above process to produce acicular magnetite particles, and if necessary, oxidizing the acicular magnetite particles to obtain acicular maghemite particles, and if necessary, modifying the acicular magnetite or maghemite particles with Co or Co and Fe.sup.2+.

    摘要翻译： 本文公开了一种制备针状针铁矿颗粒的方法，包括以下步骤：将含氧气体吹入含有胶态氢氧化亚铁或含铁胶体沉淀物的亚铁盐反应溶液中，该溶液通过使亚铁盐水溶液与小于 一种碱金属氢氧化物水溶液，碱金属碳酸盐水溶液或碱金属氢氧化物和碱金属碳酸盐水溶液中，在所述含水亚铁盐水溶液中，在抗坏血酸或其盐的存在下，氧化所述胶体 含氢氧化铁或含铁胶体沉淀物，并通过绿锈生成针状针铁矿颗粒; 以及通过将上述方法中得到的针状针铁矿粒子还原而制造针状磁性氧化铁粒子的方法，制造针状磁铁矿粒子，根据需要，根据需要氧化针状磁铁矿粒子，得到针状磁赤铁矿粒子，根据需要，对针状磁铁矿 或具有Co或Co和Fe2 +的磁赤铁矿颗粒。

    Acicular magnetic iron oxide particles
    5.
    发明授权
    Acicular magnetic iron oxide particles 失效
    针状磁性氧化铁颗粒

    公开(公告)号：US5294492A

    公开(公告)日：1994-03-15

    申请号：US722472

    申请日：1991-07-02

    申请人： Hiroshi Oka ,  Kazuaki Kouziro ,  Toshitada Shigemura ,  Tomohisa Moriya ,  Katsumi Yamashita ,  Kazushi Takama ,  Takanobu Uemoto ,  Kazuhiro Fujita

    发明人： Hiroshi Oka ,  Kazuaki Kouziro ,  Toshitada Shigemura ,  Tomohisa Moriya ,  Katsumi Yamashita ,  Kazushi Takama ,  Takanobu Uemoto ,  Kazuhiro Fujita

    IPC分类号： C01G49/00 ,  C09D5/23 ,  C09D7/12 ,  G11B5/706 ,  G11B5/712 ,  H01F1/11 ,  B32B15/02

    CPC分类号： G11B5/70673 ,  G11B5/712 ,  Y10T428/2991

    摘要： Disclosed herein is a process for producing acicular magnetic iron oxide particles comprising the steps of: mixing an aqueous dispersion of acicular magnetic iron oxide particles with an aqueous solution of a Co salt and an alkaline aqueous solution, or an aqueous solution of a Co salt, an aqueous solution of an Fe(II) salt and and an alkaline aqueous solution; and heat-treating the alkaline suspension solution obtained at 50.degree. to 100.degree. C.; wherein an Sr salt, a Ba salt or an Sr salt and a Ba salt is added to one selected from the group consisting of said aqueous dispersion of acicular magnetic iron oxide particles, said aqueous solution of a Co salt, said aqueous solution of an Fe(II) salt, said alkaline aqueous solution and said alkaline suspension solution before heat-treatment, and at least one selected from the group consisting of Si compound, Al compound, Zn compound and Mg compound is added to one selected from the group consisting of said aqueous dispersion of acicular magnetic iron oxide particles, said aqueous solution of a Co salt, said aqueous solution of an Fe(II) salt, said alkaline aqueous solution, said alkaline suspension solution before heat-treatment and said alkaline suspension solution during heat-treatment.

    摘要翻译： 本发明公开了一种制备针状磁性氧化铁颗粒的方法，包括以下步骤：将针状磁性氧化铁颗粒的水性分散体与Co盐和碱性水溶液的水溶液或Co盐的水溶液混合， Fe（II）盐和碱性水溶液的水溶液; 对在50〜100℃下得到的碱性悬浮液进行热处理。 其中将Sr盐，Ba盐或Sr盐和Ba盐加入到选自由针状磁性氧化铁颗粒的所述水分散体，所述Co盐水溶液，Fe （II）盐，所述碱性水溶液和所述碱性悬浮液在热处理前，将选自Si化合物，Al化合物，Zn化合物和Mg化合物中的至少一种添加到选自以下的一种中： 所述针状磁性氧化铁颗粒的水分散体，所述Co盐水溶液，所述Fe（II）盐水溶液，所述碱性水溶液，热处理前的所述碱性悬浮液和所述碱性悬浮液在热处理过程中， 治疗。