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11 条记录 (耗时 0.01 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 purifying phosphoric acid of heavy metal
    3.
    发明公开
    A method of purifying phosphoric acid of heavy metal 失效
    一种净化重金属的磷酸的方法

    公开(公告)号：EP0023195A3

    公开(公告)日：1981-09-09

    申请号：EP80850070

    申请日：1980-05-08

    申请人： Boliden Aktiebolag

    发明人： Berglund, Hans Arne Lennart

    IPC分类号： C01B25/238

    CPC分类号： C01B25/238

    摘要： A method of removing heavy metals, particularly cadmium, from wet-process phosphoric acid produced by digesting raw phosphoric material with sulphuric acid, by precipitating out the heavy metals in sulphide form. The residual sulphuric acid is removed first by neutralization with alkali or as a not-readily dissolved sulphate precipitate. Alkali is added to obtain an Me P ratio within the range of about 0.05-0.3, where Me is the number of catio equivalents in the alkali and P is the number of phosphorous atoms in the phosphoric acid, whereafter the heavy metals are precipitated out by adding a sulphide compound which is soluble in the phosphoric acid, and the sulphide precipitate removed.

    Method for producing silica
    4.
    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.

    A method for recovering useful products from waste products obtained when manufacturing aluminium fluoride
    5.
    发明公开
    A method for recovering useful products from waste products obtained when manufacturing aluminium fluoride 失效
    一种用于回收有用的产品从废料生产制作的氟化铝过程。

    公开(公告)号：EP0085287A1

    公开(公告)日：1983-08-10

    申请号：EP82850262.5

    申请日：1982-12-21

    申请人： Boliden Aktiebolag

    发明人： Berglund, Hans Arne Lennart

    IPC分类号： C01F7/50 ,  C01F7/54 ,  C01B33/26

    CPC分类号： C01F7/54 ,  C01B33/26 ,  C01F7/50

    摘要： The invention relates to a method for recovering useable products from waste products deriving from the manufacture of aluminium fluoride on the basis of aluminium hydroxide and fluosilicic acid. Mother liquors and washing water from a scrubber in said process, which solutions contain aluminium, silica, fluorine, and phosphorous is reacted in a first step with sodium ions at pH 2-3, and a temperature of 50-100°C to give a precipitate of sodium fluoroaluminate, which is isolated. The filtrate from said first step can be reacted with the silica waste product obtained in the above mentioned aluminium fluoride manufacture.

    A method of purifying phosphoric acid of cadmium
    7.
    发明公开
    A method of purifying phosphoric acid of cadmium 失效
    Verfahren zur Reinigung von Phosphors ure冯镉。

    公开(公告)号：EP0023195A2

    公开(公告)日：1981-01-28

    申请号：EP80850070.6

    申请日：1980-05-08

    申请人： Boliden Aktiebolag

    发明人： Berglund, Hans Arne Lennart

    IPC分类号： C01B25/238

    CPC分类号： C01B25/238

    摘要： A method of removing heavy metals, particularly cadmium, from wet-process phosphoric acid produced by digesting raw phosphoric material with sulphuric acid, by precipitating out the heavy metals in sulphide form. The residual sulphuric acid is removed first by neutralization with alkali or as a not-readily dissolved sulphate precipitate. Alkali is added to obtain an Me P ratio within the range of about 0.05-0.3, where Me is the number of catio equivalents in the alkali and P is the number of phosphorous atoms in the phosphoric acid, whereafter the heavy metals are precipitated out by adding a sulphide compound which is soluble in the phosphoric acid, and the sulphide precipitate removed.

    摘要翻译： 通过用硫酸盐沉淀出重金属，通过用硫酸消化生成的磷酸物质而产生的湿法磷酸，去除重金属，特别是镉的方法。 首先通过用碱中和或作为不容易溶解的硫酸盐沉淀物除去残留的硫酸。 添加碱以获得在约0.05-0.3的范围内的Me / P比，其中Me是碱中的阴离子当量数，P是磷酸中的磷原子数，此后重金属沉淀出来 通过加入可溶于磷酸的硫化物化合物，并除去硫化物沉淀物。