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6 条记录 (耗时 0.012 秒)

    Method for producing silica
    2.
    发明公开
    Method for producing silica 失效
    二氧化硅生产方法

    公开(公告)号：EP0106819A3

    公开(公告)日：1984-08-22

    申请号：EP83850260

    申请日：1983-09-29

    申请人： Boliden Aktiebolag

    发明人： Berglund, Hans Arne Lennart ,  Lagerström, Gösta Bertil

    IPC分类号： C01B33/12

    CPC分类号： C01B33/186 ,  C01B33/32 ,  C01F7/54 ,  C01P2006/80

    摘要： The present invention relates to a method for purifying silica waste obtained in the manufacture of aluminium fluoride from hexafluosilicic acid and aluminium hydroxide, whereby the silica, is subjected to an acidic leaching at a pH below 3 to leach out part of the fluorine and substantially all the aluminium present in said waste, and is thereafter subjected to an alkaline leaching at pH 8.5-11.5 to leach out remaining fluorine present in said waste. The teachings are preferably carried out at elevated temperatures, normally 60-90°C, and for a time sufficient to considerably reduce the contents of aluminium and fluorine, normally 1-3 hrs. The silica obtained is highly reactive and can be used as such or transformed into sodium slicate by a reaction with sodium hydroxide. The contents of fluorine and aluminium can be transferred to a process for the production of cryolite or similar compounds.

    A method of producing so-called lick stones
    4.
    发明公开
    A method of producing so-called lick stones 失效
    Verfahren zur Herstellung von Lecksteinen。

    公开(公告)号：EP0025024A1

    公开(公告)日：1981-03-11

    申请号：EP80850125.8

    申请日：1980-08-26

    申请人： Boliden Aktiebolag

    发明人： Lagerström, Gösta Bertil

    IPC分类号： A23K1/175

    CPC分类号： A23K20/26

    摘要： Components a) calcium phosphate, optionally b) monosodium phosphate and c) calcium carbonate are mixed together in the presence of water while adding sodium chloride. The castable mass obtained, after being given a suitable form, is allowed to harden by reaction between the components thereof.
    Molasses or other sugar products, in an amount of up to 10% by weight, can be included in the composition.

    摘要翻译： 组分a）磷酸钙，任选地b）单磷酸钠和c）碳酸钙在水的存在下混合在一起，同时加入氯化钠。 在得到适当的形式后得到的浇注料可以通过其组分之间的反应来硬化。 组合物中可以含有高达10重量％的糖浆或其它糖产品。

    Method for producing silica
    5.
    发明公开
    Method for producing silica 失效
    一种用于前制备二氧化硅处理。

    公开(公告)号：EP0106819A2

    公开(公告)日：1984-04-25

    申请号：EP83850260.7

    申请日：1983-09-29

    申请人： Boliden Aktiebolag

    发明人： Berglund, Hans Arne Lennart ,  Lagerström, Gösta Bertil

    IPC分类号： C01B33/12

    CPC分类号： C01B33/186 ,  C01B33/32 ,  C01F7/54 ,  C01P2006/80

    摘要： The present invention relates to a method for purifying silica waste obtained in the manufacture of aluminium fluoride from hexafluosilicic acid and aluminium hydroxide, whereby the silica, is subjected to an acidic leaching at a pH below 3 to leach out part of the fluorine and substantially all the aluminium present in said waste, and is thereafter subjected to an alkaline leaching at pH 8.5-11.5 to leach out remaining fluorine present in said waste. The teachings are preferably carried out at elevated temperatures, normally 60-90°C, and for a time sufficient to considerably reduce the contents of aluminium and fluorine, normally 1-3 hrs.
    The silica obtained is highly reactive and can be used as such or transformed into sodium slicate by a reaction with sodium hydroxide. The contents of fluorine and aluminium can be transferred to a process for the production of cryolite or similar compounds.