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    Production of boric oxide
    4.
    发明公开
    Production of boric oxide 失效
    Verfahren zur Herstellung von Boroxyd。

    公开(公告)号：EP0654442A1

    公开(公告)日：1995-05-24

    申请号：EP94308630.6

    申请日：1994-11-23

    申请人： U.S. BORAX INC.

    发明人： Jacobs, Paul F. ,  Fisher, Richard P. ,  Mu, Jacob J.

    IPC分类号： C01B35/10

    CPC分类号： C01B35/1036

    摘要： An amorphous boric oxide product obtainable by dehydrating boric acid, which product comprises 85 to 92wt% B₂O₃ and is essentially free of sodium.

    摘要翻译： 通过使硼酸脱水获得的无定形硼氧化物产物，该产物包含85至92重量％的B 2 O 3并且基本上不含钠。

    Process for producing finely divided powdery compositions
    5.
    发明公开
    Process for producing finely divided powdery compositions 失效
    Verfahren zur Herstellung fein verteilter Pulverzusammensetzungen。

    公开(公告)号：EP0282139A1

    公开(公告)日：1988-09-14

    申请号：EP88200427.8

    申请日：1988-03-08

    申请人： AKZO N.V.

    发明人： Sherif, Fawzy Gamaleldin ,  Via, Francis Anthony

    IPC分类号： C01G1/02 ,  C01F1/00 ,  C04B35/00

    CPC分类号： C04B35/486 ,  C01B13/18 ,  C01B13/32 ,  C01B33/1546 ,  C01B33/163 ,  C01B35/1036 ,  C01F5/02 ,  C01F7/025 ,  C01G19/02 ,  C01G23/053 ,  C01G25/02 ,  C01P2004/50 ,  C01P2004/51 ,  C01P2004/52 ,  C01P2004/61 ,  C04B35/624 ,  C04B35/626 ,  H01L39/2419 ,  Y10S420/901

    摘要： A finely divided metal oxide powdery composition, preferably with a narrow particle size distribution, is produced from a particulate, sol-gel derived composition containing agglomerates by heating the particulate composition in the presence of an effective amount of a composition which decomposes upon heating and forms a gas to break at least a portion of the agglomerates so as to yield the desired finely divided ceramic particle composition. Examples of suitable gas-forming agents for use in the present invention include the ammonium salts or amides of organic and inorganic acids, volatile acids, and gases dissolved in a suitable solvent, such as water, alcohol or ammonia.

    摘要翻译： 优选具有窄粒度分布的细碎金属氧化物粉末组合物由含有附聚物的颗粒状溶胶 - 凝胶衍生组合物通过加热颗粒组合物在有效量的加热和形式分解的组合物的存在下制备 一种气体来破坏至少一部分附聚物，以产生所需的细碎陶瓷颗粒组合物。 用于本发明的合适的气体形成剂的实例包括有机和无机酸的铵盐或酰胺，挥发性酸和溶于合适溶剂如水，醇或氨的气体。

    Process for preparing fine particles of metal oxides
    6.
    发明公开
    Process for preparing fine particles of metal oxides 失效
    Verfahren zur Herstellung von feinen Metalloxidteilchen。

    公开(公告)号：EP0255702A2

    公开(公告)日：1988-02-10

    申请号：EP87111059.9

    申请日：1987-07-30

    申请人： Montedison S.p.A.

    发明人： Albizzati, Enrico ,  Mello Ceresa, Emiliano ,  Zaninetta, Luciano

    IPC分类号： C01B13/14

    CPC分类号： C01B13/328 ,  C01B33/126 ,  C01B35/1036 ,  C01F7/34 ,  C01F7/36 ,  C01G23/053 ,  C01G23/0536 ,  C01G25/02 ,  C01P2004/32 ,  C01P2004/61 ,  C01P2004/62

    摘要： The present invention relates to a process for preparing spheroidal particles of metal oxides having an average diameter smaller than 3 microns, which process is characterized in that an emulsion is prepared of a hydrolyzable liquid metal com­pound in a perfluoropolyether and the emulsion is reacted with water, water vapour or a mixture, in any ratio, of water with a liquid miscible or immiscible with it, which does not inter­fere with the reaction of the metal compound with water, thus, obtaining a metal oxide hydrate which is separated, subse­quently dried and calcined.

    摘要翻译： 本发明涉及一种制备平均直径小于3微米的金属氧化物的球形颗粒的方法，该方法的特征在于在全氟聚醚中制备可水解液态金属化合物的乳液，并将乳液与水反应， 水蒸汽或任何比例的水与液体混溶或不混溶的混合物，其不会干扰金属化合物与水的反应，从而获得分离的，随后干燥和煅烧的金属氧化物水合物 。

    PRODUCTION OF BORIC OXIDE
    8.
    发明授权
    PRODUCTION OF BORIC OXIDE 失效
    用于生产氧化硼

    公开(公告)号：EP0824502B1

    公开(公告)日：2001-10-10

    申请号：EP96913246.3

    申请日：1996-04-29

    申请人： U.S. Borax Inc.

    发明人： FISHER, Richard, P. ,  KWAMYA, John, D. ,  GRAY, Tracy, E.

    IPC分类号： C01B35/10

    CPC分类号： C01B35/1036

    摘要： Amorphous boric oxide-containing product having about 80 to 90 % B2O3 is produced by heating boric acid to an elevated temperature of about 180° to 220 °C to dehydrate the boric acid and form a molten glass which is cooled to a solid glassy product. The solid glass can be comminuted to produce a particulate product. Preferably the boric acid is heated at about 195° to 205 °C. The process is readily adapted to a continuous process in which the boric acid is continuously fed through a heated reactor-mixer such as a Kneadermaster mixer or Discotherm mixer. The molten glassy product is cooled to form a solid glassy product which can be comminuted to a desirable particle size range.