• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    To manufacture iron powders suitable for powder metallurgy from fine iron oxide powder with an average grain size of less than 100 mu m, the reduction of fine, loose iron oxide powders porous in themselves with a bulk density of less than 1.0 Mg.m<-><3> is carried out with gaseous reduction agents, preferably hydrogen, at temperatures between 1200 and 1392 DEG C, preferably between 1200 and 1300 DEG C.
    公开号:SU1699346A3
    申请号:SU874028915
    申请日:1987-02-02
    公开日:1991-12-15
    发明作者:Шрей Гюнтер；Даннингер Херберт；Янгг Герхард
    申请人:Фоест-Альпине Индустрианлагенбау Гезельшафт Мбх. (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to powder metallurgy, in particular, to methods for producing iron powder.
    The circuit of the invention is the simplification of the process.
    Example 1. 100 g of iron oxide powder, particle size 50 μm, bulk density of 0.38 mg, having 30. 29% of reduced oxygen was poured into an iron boat 30 mm high. The boat was placed in a methodic furnace with resistive heating for 4 hours at 1,300 ° C. The consumption of hydrogen was 2 l / min. After the product was cooled in a hydrogen environment in a water-cooled furnace, the reduction product was removed from the boat and ground in a knife for 2 minutes. A powder was obtained with the following properties: filling density
    about
    3.17 mg m, flow period 4.8 s / 50 g (standard funnel 5 mm), pressing density 6.64 m m at 6 kbar.
    Example 2. 100 g of iron oxide powder were processed as in example 1, in addition, the reduction was carried out for 1 h at 1300 ° C, and then the Zch at 1000 ° C. The powder obtained had the following properties, a filling density of 2.88 g / cm3, an expiration time of 5.7 s / 50 g, a pressing density of 6.56 g / cm3 at 600 ° C (ground) and 6.81 g / cm at 600 ° C (heated) average particle size of 60 microns.
    Depending on the duration of the high-temperature reduction, thinner or coarser fluxes can be obtained. yu so
    Ј
    ON
     WITH
    Roshki If it is desired to obtain thinner powders than those obtained at 1300 ° C, with an average particle diameter of 80-100 microns, then a short-term reduction at a high temperature is performed, followed by leveling at a lower temperature in order to reduce the internal porosity of the powders without increasing the particle size.
    The proposed method involves the processing of iron oxide powders from fine to highly dispersed, which are formed in large quantities, for example, during regeneration of the pickling solution in the steelmaking and rolling industries. The powders of oxides obtained during regeneration consist of numerous needle particles with a diameter of less than 1 µm, which are weakly sintered. The bulk density of such oxide powders is less than 1.0 mgm, in part even less than 0.5 mg m 3.
    The preparation of powders of iron suitable for use in powder metallurgy is achieved by using thin, loose, porous iron oxide powders with a bulk density of less than 1.0 mg and reducing them with a gaseous reducing agent at 1200-1392 ° C, preferably at 1200-1300 ° C.
    Metallographic studies of the proposed method showed that during the process, the fine oxide particles begin to combine first into fry agglomerates, and then into solid and less porous aggregates, which are then largely preserved when grinding the reduced product and form individual particles. iron powder.
    The proposed method is simple to implement, since it does not require a multistep process and allows varying the internal temperature by varying the process temperature.
    0 5 0
    five
    five
    0
    five
    0
    porosity, which is preferred when preparing sponge iron powders. This method involves the use of partially oxidized gas from a lower temperature stage and transfer it to another stage with a higher temperature. In a preferred embodiment, iron oxide is introduced in countercurrent to the movement of the reducing gas and transferred to a stage with a higher temperature and then to a stage with a low temperature. Such an embodiment provides particularly preferred properties of the iron powder upon further processing by powder metallurgy technology.
    权利要求:
    Claims (5)
    [1]
    1. A method of producing iron powder, including the reduction of iron oxides in hydrogen, characterized in that, in order to simplify the process, powders of oxides with a bulk density of less than 1.0 mg m are taken as starting material and the reduction is carried out at 1200-1392 ° C .
    [2]
    2. A method according to claim 1, characterized in that prior to reduction, the oxide powder is compacted at a pressure of less than 1 kbar.
    [3]
    3. A method according to claim 2, characterized in that prior to reduction, an additional heat treatment is carried out at a temperature below 1200 ° C.
    [4]
    4. Method according to paragraphs. 1-3, characterized in that the reduction is carried out in a partially oxidized gas atmosphere.
    [5]
    5. Method according to paragraphs. 1-4, which is different from that with the restoration of the supply of oxides and the heat treatment, the supply of the reduced product is carried out in countercurrent to the movement of the reducing gas.
    Priority points: 03.02.86 according to claim 1 - the recovery is carried out at 1200-1392 ° C. 12/17/88 in paragraphs 1-5 - other signs.
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    同族专利:
    公开号 | 公开日
    EP0232246A3|1988-07-20|
    CS273319B2|1991-03-12|
    EP0232246A2|1987-08-12|
    CS61287A2|1990-07-12|
    EP0232246B1|1992-03-25|
    AT74038T|1992-04-15|
    DE3777670D1|1992-04-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB1175985A|1967-10-19|1970-01-01|Fina Metal Ltd|Direct Reduction of Iron Oxide to Non-Pyrophoric Iron Powder|
    GB1288252A|1969-03-25|1972-09-06|
    DE2443978C3|1974-09-12|1982-04-15|Mannesmann AG, 4000 Düsseldorf|Process for making ice powder|DE19544107C1|1995-11-27|1997-04-30|Starck H C Gmbh Co Kg|Metal powder granules, process for its preparation and its use|
    AT495138T|2006-12-01|2011-01-15|Michael J Ruthner|PROCESS FOR PRODUCING IRON POWDER OR STEEL POWDER FROM IRON OXIDE POWDER BY OXIDATION AND REDUCTION|
    CZ2007255A3|2007-04-12|2008-10-22|Univerzita Palackého v Olomouci|Synthesis method of nanopowder iron with protective oxidic shell from natural abd synthetic nanopowder iron oxides and oxihydroxides|
    CN102139375A|2011-03-18|2011-08-03|上海大学|Method for preparing micron-size superfine iron powder|
    CN103203457A|2013-04-15|2013-07-17|河北钢铁股份有限公司邯郸分公司|Method for manufacturing iron-copper alloy from iron oxide red and copper sulfate|
    DE102019207824A1|2019-05-28|2020-12-03|Thyssenkrupp Steel Europe Ag|Process for the production of iron powder|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    AT25386|1986-02-03|
    AT335886A|AT386555B|1986-12-17|1986-12-17|Method for manufacturing iron powders suitable for powder metallurgy from fine iron oxide powder by reduction using hot gases|
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