• 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:
    The invention relates to a method for producing active alumina. The purpose of the invention is to simplify and reduce the cost of technology. Metal aluminum depassiviruyut. in a nitric acid solution containing 0.5-1.0 g / l of mercury. Then anodic dissolution is carried out in a solution of nitric acid using an aluminum-graphite galvanic pair. Removal of the precipitate of aluminum hydroxide and the introduction of a solution of nitric acid lead-periodically after 1-3 days. The resulting aluminum hydroxide is dried and calcined. 1 3.p. f-ly, 1 tab. SU) with ate JV GO see
    公开号:SU1355120A3
    申请号:SU833658449
    申请日:1983-11-04
    公开日:1987-11-23
    发明作者:Манди Тамаш；Немет Ласло；Керти Йожеф；Грофчик Элемер；Керекеш Андраш
    申请人:Мадьяр Сенхидрогенипари Кутато-Фейлесте Интезет (Инопредприятие)；Кепорц Электроникаи Алькатрес Еш Мюсаки Керамиадьярто Валлалат (Инопредприятие)；
    IPC主号:
    专利说明:

    The invention relates to a method for producing active alumina. The aim of the invention is to simplify and reduce the cost of technology.
    Example 1. In a plastic cylindrical vessel with a capacity of 200 liters, 12 rods of refined aluminum weighing 5 kg and graphite each are placed. The aluminum rods are pretreated for 15 minutes with an activating aqueous monomoleric nitric acid solution containing 0, & g / l of mercury ions to the immersion depth. Approximately 80 l of a two-molar solution of nitric acid is poured into the container, and all aluminum and graphite rods are connected by means of a pre-conductor to a common anodic and cathodic busbar. In the current circuit obtained by such a short-circuited cell, a high-power rheostat and an ammeter are included.
    Using a rheostat at the beginning of a highly heated cell, the current is reduced to less than 100 A to prevent boiling of the solution. As a result of the dissolution of aluminum and an increase in the content of nitrate ions in the cell, the pH stabilizes in the range of 3.9-4.1 and the process begins. gel formation of aluminum hydroxide. From the moment of stabilization of the pH, the magnitude of the current in the cell is established within 15A with a fully removed rheostat, and the content of the cell is cooled to room temperature.
    After three days, the gel collected in the lower part is removed, and the well is filled with a new solution of nitric acid. The process is carried out until the aluminum rods are almost completely dissolved. The gel withdrawn from the cell is centrifuged to remove the mother liquor, then extruded to obtain bars with a diameter of 1.5 mm, dried and heat-treated.
    500-700 C to obtain high-purity alumina y-modification.
    Example 2. The process is carried out under the conditions specified in Example I, with the difference that 6 cells are simultaneously operated, the aluminum and graphite rods of which are connected to the common anodic and cathode walls in parallel. Every 8 hours, the solution is renewed in two cells in succession.
    As a result, the hydroxide gel formed is removed from each cell once a day.
    The properties of the obtained aluminum oxide U-modification are given in the table.
    The invention allows technology to be reduced by reducing power consumption and reducing costs by simplifying the processing circuitry.
    0
    five
    0
    five
    权利要求:
    Claims (2)
    [1]
    1. A method of producing active alumina, including anodic dissolution of metallic aluminum in a solution containing 1 mol / l of nitrate ions, to produce aluminum hydroxide, then drying it and calcining to obtain aluminum oxide, which differs (5 in order to simplify and cheaper technology, before dissolving, metallic aluminum is depassivated by immersion in a nitric acid solution containing 0.5-1.0 g / l of mercury, anodic dissolution is carried out in a solution of nitric acid using an aluminum-graphite galvanic couple
    [2]
    2. The method according to claim 1, 2 and 5, so that the anodic dissolution is carried out with the combination of several electroplating pairs in parallel with the periodic removal of the precipitate of aluminum hydroxide and the introduction of a solution of nitric acid after 1-3 days.
    Editor R. Volkova
    Compiled by N.Novikov Tehred M.Hodanich
    Order 5719/57 Circulation 456 Subscription
    VNIIPI USSR State Committee
    for inventions and discoveries 113035, Moscow, Zh-35, Raushsk Nab., 4/5
    Production and printing company, Uzhgorod, Projecto st., 4
    Proofreader M.Sharoshi
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    同族专利:
    公开号 | 公开日
    EP0108968A1|1984-05-23|
    DD230885A1|1985-12-11|
    HU189188B|1986-06-30|
    AT32106T|1988-02-15|
    DE3375407D1|1988-02-25|
    EP0108968B1|1988-01-20|
    引用文献:
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    RU2664135C1|2017-07-17|2018-08-15|Федеральное государственное бюджетное учреждение науки Институт химии высокочистых веществ им. Г.Г. Девятых Российской академии наук |Method of electrochemical obtaining of aluminum oxide powders|US3974055A|1974-12-23|1976-08-10|The Dow Chemical Company|Aluminum alloy anode composition|US20050124745A1|2002-04-19|2005-06-09|Saint-Gobain Ceramics & Plastics, Inc.|Flame retardant composites|
    US20060104895A1|2004-11-18|2006-05-18|Saint-Gobain Ceramics & Plastics, Inc.|Transitional alumina particulate materials having controlled morphology and processing for forming same|
    US7479324B2|2005-11-08|2009-01-20|Saint-Gobain Ceramics & Plastics, Inc.|Pigments comprising alumina hydrate and a dye, and polymer composites formed thereof|
    EP2231523A2|2007-12-19|2010-09-29|Saint-Gobain Ceramics & Plastics, Inc.|Aggregates of alumina hydrates|
    US8460768B2|2008-12-17|2013-06-11|Saint-Gobain Ceramics & Plastics, Inc.|Applications of shaped nano alumina hydrate in inkjet paper|
    RU2466937C2|2010-12-21|2012-11-20|Андрей Павлович Лысенко|Method of obtaining aluminium oxide applicable for manufacturing artificial corundum crystals|
    RU2742575C1|2020-10-14|2021-02-08|Общество с ограниченной ответственностью "Империус Групп"|Method for producing alpha-aluminium oxide for subsequent growth of single-crystal sapphire|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    HU823602A|HU189188B|1982-11-09|1982-11-09|Process for producing active aluminium-oxid|
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