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    • 专利摘要:
    1486961 Magnetite MONTEDISON SpA 24 Feb 1975 [25 Feb 1974] 7635/75 Heading ClA Equiaxial magnetite having a particle size in the range 0À05 to 1 micron is prepared from an aqueous solution of ferrous sulphate by either (A) adding alkali at 15-40‹ C. to precipitate substantially 2/3 of the Fe(II) ions as Fe(OH) 2 , oxidizing the Fe(OH) 2 to goethite α-FeO(OH), adding alkali to precipitate the remaining Fe(II) ions as Fe(OH) 2 , adding 0À1-10% (based on ferrous ion initially present in aqueous solution) of γ-FeO(OH), and heating to 70-100‹ C., or (B) adding alkali at 15-40‹ C., to precipitate substantially all of the Fe(II) ions as Fe(OH) 2 , heating to 70-100‹ C., adding 0À1-10% (based as above) of γ-FeO(OH) and oxidizing the Fe(OH) 2 with air. The γ-FeO(OH) may be prepared by adding alkali to aqueous ferrous sulphate to pH 9 and blowing in air at this pH.
    公开号:SU786882A3
    申请号:SU752108061
    申请日:1975-02-24
    公开日:1980-12-07
    发明作者:Гарбери Анджело；Джеддо Агостино；Лоренцо Марциано Джан；Вивиани Бруно
    申请人:Монтэдисон С.П.А. (Фирма)；
    IPC主号:
    专利说明:

    one
    The invention relates to the production of magnetite and can be used in the manufacture of ferrous iron oxide pigments Hfcjx.
    A known method of producing magnetite by treating solutions of ferrous sulfate with alkali to a pH of 11-12, followed by oxidation of the resulting iron hydroxide, dehydration and drying of Cll. 10
    The closest to the invention in technical essence and the achieved results is a method of producing magnetite by treating solutions of ferrous sulphate with alkali at j pH 7-8, followed by oxidation of iron hydroxide with air at a temperature of SO-IOO C in the presence of nitrate and permanganate ions. The method has no possibility of obtaining magnetite particles with a size of less than 0.3 microns, which provides an intense black color of the pigments.
    The aim of the invention is the preparation of magnetite with a particle size of 0.08-0.22 μm.
    The goal is achieved by the described method of obtaining magnetite, which consists in the fact that
    the iron sulfate solution is treated with alkali, lepidocrocite is added in an amount to ensure that the iron content in the added lepidocrocite is 0.1-2% relative to the amount of ferrous iron in the initial solution of ferrous sulfate, iron hydrazoxide is oxidized at 50-100 o, the magnetite precipitate is separated and dried.
    A distinctive feature of the method is the mixing of the formed iron hydroxide with lepidocrocite in an amount that provides an iron content of 0.1-2% relative to the amount of ferrous iron in the initial solution of ferrous sulfate.
    When adding lepidocrocite in quantity; providing an iron content in the added lepidocrocite less than 0.1% relative to the amount of ferrous iron in the initial solution, magnetite particles with a size of less than 0.3 µm cannot be obtained, and adding lepidocrocite in an amount that provides the iron content in the added lepidocrocite more than 2 % no longer affects the size of the magnetite particles.
    The use of magnetite with a particle size of 0.08-0.22 µm allows to obtain pigments with an intense black color.
    Example. 3500 l of ferrous sulphate solution obtained from the T i Oj production process by the sulphate method and having an Fe concentration of 60 g / l are fed to a 6 m reactor equipped with a stirrer. There Xs serves solution of NaOH with a concentration of 650 g / l. The temperature of the reaction mixture is 90 ° C. Lepidocrocite suspension with a concentration of 2 g / l is then added in such an amount that the iron content of the added J-FeOOH is 0.1% relative to the amount of ferrous iron in the initial solution of ferrous sulfate. In addition, an amount of water is added such that the concentration of Fe in the reaction mixture is 50.7 g / l.
    After that, while maintaining a constant temperature, air is blown in until the redox potential of the solution reaches a value of 450 mV. The resulting magnetite is filtered and dried. The product has an average particle size of 0.22 microns.
    EXAMPLE 2 The process is carried out analogously to example 1, but the α-FeOOH suspension is added in an amount that provides 1.2% lepidocrocite with respect to the amount in the initial solution. Get particles
    magnetite with an average size of 0.126 microns.
    Example 3 The process is carried out analogously to example 1, but a suspension of α-FeOOH is added in an amount providing an Fe content in the added lepidocrocite of 2% with respect to the amount of Fe in the initial solution. Particles of magnetite are obtained with an average size of 0.08 μm.
    权利要求:
    Claims (2)
    [1]
    Invention Formula
    The method of producing magnetite for the preparation of black pigments by treating the iron sulfate solution with alkali, followed by oxidation of the formed iron hydroxide at a temperature of 50-100 with air, separating and drying the product, in order to obtain magnetite with a particle size of 0 , 08-0,22 µm, providing an increase in the intensity of the color of pigments, prior to oxidation, iron hydroxide is mixed with lepidocrocite in an amount that provides the iron content of the added lepidocrocite from 0.1-2% relative to the amounts in ferrous iron in the initial solution of ferrous sulfate.
    Sources of information taken into account in the examination 1. The author's certificate of the USSR
    No. 363665, cl. From 01 G 49/08, published
    02.13.73.
    [2]
    2. USSR author's certificate
    No. 394318, cl. C 01 G 49/08,
    12.28.74.
    类似技术:
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    同族专利:
    公开号 | 公开日
    DE2508085A1|1975-08-28|
    JPS50124900A|1975-10-01|
    NL7502002A|1975-08-27|
    US4024232A|1977-05-17|
    FR2261981B1|1977-04-15|
    ES435023A1|1977-01-01|
    FR2261981A1|1975-09-19|
    BE825947A|1975-08-25|
    IT1008298B|1976-11-10|
    GB1486961A|1977-09-28|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US1392927A|1920-06-22|1921-10-11|Magnetic Pigment Company|Pigment and method of producing same|
    GB433333A|1934-05-03|1935-08-13|Joseph Williams Ayers|Improvements in black oxide of iron|
    US2939767A|1957-10-07|1960-06-07|Columbian Carbon|Manufacture of iron oxides|
    NL6602319A|1965-03-03|1966-09-05|
    US3617562A|1970-05-08|1971-11-02|Allen Cywin|Neutralization of ferrous iron-containing acid wastes|
    DE2029300C3|1970-06-13|1979-04-12|Bayer Ag, 5090 Leverkusen|Process for the production of iron oxide and iron oxide hydrate pigments|DE2617569A1|1976-04-22|1977-11-03|Bayer Ag|PRODUCTION OF IRON OXIDE BLACK PIGMENTS BY OXYDATING METALLIC IRON WITH OXYGEN-CONTAINING GASES|
    US4670357A|1985-06-17|1987-06-02|International Fuel Cells Corporation|Fuel cell powerplant employing an aqueous solution|
    DE3523317A1|1985-06-29|1987-01-02|Basf Ag|METHOD FOR PRODUCING MAGNETIC PIGMENTS|
    DE3821342A1|1988-06-24|1989-12-28|Bayer Ag|NEW IRON OXIDE PIGMENTS, METHOD FOR THE PRODUCTION AND USE THEREOF|
    EP0401000B1|1989-05-31|1995-07-26|Toda Kogyo Corp.|Plate-like magnetite particles and process for producing the same|
    KR100442541B1|2001-09-12|2004-07-30|주식회사 페로엔텍|Method for preparing magnetite in aqueous solution at room temperature and Method for water-waste-treatment using the said magnetite|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    IT48633/74A|IT1008298B|1974-02-25|1974-02-25|METHOD FOR OBTAINING CONTROLLED GRANULOMETRY MAGNETITE STARTING FROM FERROUS SULPHATE SOLUTIONS|
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