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    Process of preparing virtually cadmium-free calcium sulphate and calcium sulphate prepared according to this process
    2.
    发明公开
    Process of preparing virtually cadmium-free calcium sulphate and calcium sulphate prepared according to this process 失效
    一种用于生产几乎无镉硫酸钙和根据该方法处理获得硫酸钙。

    公开(公告)号：EP0245897A1

    公开(公告)日：1987-11-19

    申请号：EP87200767.9

    申请日：1987-04-23

    申请人： DSM N.V.

    发明人： Spijker, Ruud ,  Tjioe, Tjay Tjien ,  Witkamp, Geert Jan

    IPC分类号： C01B25/238 ,  C01F11/46

    CPC分类号： C01B25/22 ,  C01B25/2216 ,  C01B25/223 ,  C01B25/226 ,  C01B25/229 ,  C01B25/238 ,  C01F11/46

    摘要： Virtually cadmium-free calcium sulphate is produced in the preparation of a liquid medium containing phosphoric acid, which comprises digestion with a mineral acid of cadmium-containing phosphate rock and separation from the liquid medium containing phosphoric acid of at least a portion of the calcium in the phosphate rock after precipitation by means of a solution containing sulphate ions in the form of calcium sulphate, in which process halogen ions are present in an amount of 50-20.000 ppm during precipitation of the calcium sulphate to be separated.

    摘要翻译： 几乎无镉硫酸钙是在制备的液体培养基含有磷酸的，其与含镉磷矿和分离的无机酸从含有至少一个中的钙的一部分的磷酸的液体介质包括消化产生 沉淀后的磷矿石由硫酸钙的沉淀过程中含在硫酸钙的形式的硫酸根离子的溶液中，在该方法中的卤素离子存在于在50〜20000ppm的量的手段进行分离。