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    Acicular magnetic iron oxide particles
    31.
    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

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

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

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

    CPC classification number: G11B5/70673 ,  G11B5/712 ,  Y10T428/2991

    Abstract: 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.

    Abstract translation: 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。

    Process for producing plate-like magnetite particles and plate-like maghemite particles
    33.
    发明授权
    Process for producing plate-like magnetite particles and plate-like maghemite particles 失效
    板状磁铁矿颗粒和板状磁赤铁矿颗粒的生产方法

    公开(公告)号：US4865834A

    公开(公告)日：1989-09-12

    申请号：US156508

    申请日：1988-02-16

    Applicant: Mamoru Tanihara ,  Yoshiro Okuda ,  Hideaki Sadamura

    Inventor： Mamoru Tanihara ,  Yoshiro Okuda ,  Hideaki Sadamura

    IPC: G11B5/706

    CPC classification number: G11B5/70689

    Abstract: Plate-like magnetite particles, plate-like maghemite particles and the processes for producing these particles are herein disclosed. The plate-like magnetite particles and the plate-like maghemite particles provided according to the present invention are fine plate-like particles which are poreless and non-sintered as the plate-like magnetite particles are produced directly from an aqueous solution and these plate-like magnetite particles are oxidized by heating to produce the plate-like maghemite particles. Therefore, these particles can be filled to a high density in a vehicle or resin, have good dispersibility and orientability and are also high in a degree of particle contact, so that they are suited for use as electromagnetic wave absorbing and shielding material, magnetic material for magnetic recording, black or brown pigment for paints and colorant for rubber and plastic products.

    METHOD FOR PRODUCING LITHIUM SULFATE AND TRANSITION METAL SULFATE
    39.
    发明公开
    METHOD FOR PRODUCING LITHIUM SULFATE AND TRANSITION METAL SULFATE 审中-公开

    公开(公告)号：US20240286912A1

    公开(公告)日：2024-08-29

    申请号：US18578865

    申请日：2022-07-07

    Applicant: TODA KOGYO CORP.

    Inventor： Tomohiro HONDA ,  Anyu ZHANG ,  Masayuki YOKOTA ,  Nobuyuki TAGAMI

    IPC: C01D15/06 ,  C22B3/44 ,  H01M10/54

    CPC classification number: C01D15/06 ,  C22B3/44 ,  H01M10/54

    Abstract: The present invention is to provide a means for efficiently and economically separating and recovering transition metals including nickel and cobalt, and lithium from an aqueous sulfate solution comprising the transition metal and lithium as major components.
    The present invention is a process for producing lithium sulfate comprising:



    a step of concentration-crystallization to an aqueous solution comprising at least lithium sulfate and a transition metal sulfate as main components so as to obtain a slurry comprising lithium sulfate as a solid content, and
    a step of solid-liquid separation of the slurry obtained in the step of concentration-crystallization so as to separate lithium crystals and a crystallization mother liquor.

    PROCESS FOR PRODUCING LITHIUM HYDROXIDE
    40.
    发明公开
    PROCESS FOR PRODUCING LITHIUM HYDROXIDE 审中-公开

    公开(公告)号：US20240240330A1

    公开(公告)日：2024-07-18

    申请号：US18562214

    申请日：2023-01-05

    Applicant: TODA KOGYO CORP.

    Inventor： Tomohiro HONDA ,  Anyu ZHANG ,  Masayuki YOKOTA ,  Nobuyuki TAGAMI

    IPC: C25B1/16 ,  B01D9/02 ,  C25B1/22

    CPC classification number: C25B1/16 ,  B01D9/02 ,  C25B1/22

    Abstract: The present invention provides an efficient producing method of high-purity lithium hydroxide, capable of increasing the yield of lithium hydroxide, removing alkali metal impurities, and reducing the amount of by-products generated.
    A process for producing lithium hydroxide from lithium sulfate as a starting material containing at least one of sodium and potassium as impurities, which process comprises the following steps of (A) to (F):



    (A) a production step of an aqueous lithium hydroxide solution and sulfuric acid by an electrochemical membrane separation method using lithium sulfate as a raw material;
    (B) a crystallization step producing a lithium hydroxide crystal by crystallization using the obtained aqueous lithium hydroxide solution in the above electrochemical membrane separation step as a raw material;
    (C) a solid-liquid separation step in which a portion of slurry in the above crystallization step is discharged and is subjected to solid-liquid separation to separate a lithium hydroxide crystal and crystallization mother liquor, and thereafter a washing step to clean the separated solid content;
    (D) a carbonation step obtaining a slurry comprising a lithium-containing carbonate compound as a solid content by discharging a portion of crystallization mother liquor in said crystallization step and reacting said discharged crystallization mother liquor with carbon dioxide gas, and a solid-liquid separation step separating said slurry into a lithium-containing solid content and a liquid content;
    (E) an acid dissolution step producing a lithium sulfate aqueous solution by reacting said lithium-containing solid content with sulfuric acid;
    (F) a mixing step reusing the lithium sulfate aqueous solution obtained by said acid dissolution step as the raw material of said step of (A).

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