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    Granulation
    1.
    发明公开
    Granulation 失效
    造粒。

    公开(公告)号：EP0074730A1

    公开(公告)日：1983-03-23

    申请号：EP82304422.7

    申请日：1982-08-20

    申请人： Interox Chemicals Limited

    发明人： Hutton, Denis Albert ,  Millar, Malcolm Howard

    IPC分类号： B01J2/28 ,  C07C179/10 ,  B01J2/16 ,  C11D3/39

    CPC分类号： C11D3/3945 ,  B01J2/16 ,  B01J2/28 ,  C07C407/00 ,  C07C409/30

    摘要： In particulate compositions, it is advantageous to seek to match the physical properties such as particle size and density of the components and in particular it is desirable to modify the physical properties of magnesium salts of various percarboxylic acid carboxylates for example particular magnesium monoperoxyphthalate, that have been produced in the processes described in European Patent Specification 27693 and unpublished British Patent Application 8117841, for subsequent incorporation in detergent and/or bleaching compositions.
    In the present invention, granules of the magnesium salts are obtained by spraying onto agitated feed particles of the salt a small amount of a dilute aqueous solution of a synthetic poly hydroxy-substituted compound, particularly polyvinylalcohol and drying the resultant agglomerate. it is especially suitable to carry out the granulation process in a warm air fluidised bed using feed particles of mainly below 200 microns producing eventually a low bulk density product mainly in the range 200-1000 microns.
    In a modification of the fluidised bed process, the agglomerating agent used can be a aqueous solution of carboxylated polyvinyl alcohol.

    Further improvements in tungsten recovery
    3.
    发明公开
    Further improvements in tungsten recovery 失效
    钨恢复。

    公开(公告)号：EP0200318A1

    公开(公告)日：1986-11-05

    申请号：EP86301918.8

    申请日：1986-03-17

    申请人： Interox Chemicals Limited

    发明人： Anderson, Diana Mary ,  Hutton, Denis Albert

    IPC分类号： C22B34/36 ,  C22B7/00 ,  C01G41/00

    CPC分类号： C22B7/007 ,  C01G41/00 ,  C22B3/165 ,  C22B34/36 ,  Y02P10/234

    摘要： The scarcity of high grade tungsten ores obliges users to seek to recover it from scrap materials, but drill bits in particular pose especial problems. Existing proposals to use acidic hydrogen peroxide to oxidise and solubilise tungsten is extremely inefficient in reagent consumption per unit tungsten recovered.
    According to the present invention, hydrogen peroxide can be used considerably more efficiently in the extraction of tungsten into an aqueous acidic solution by employing certain promoters which are solid at 50°C in the form of fused blocks. These blocks release the promoter slowly into the reaction solution and achieve similar efficiency of use of hydrogen peroxide and acid but at markedly reduced consumption of promoter in comparison with the same promoter added in powder or granular form. Examples of such promoter are hydroxy or amino substituted aromatic carboxylic acids e.g. 2-hydroxybenzoic acid. The promoter can most conveniently be used in a multi-stage tungsten extraction process.