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    Process for defluorinating alkali metal phosphate solutions
    1.
    发明授权
    Process for defluorinating alkali metal phosphate solutions 失效
    氟化碱金属磷酸盐溶液的方法

    公开(公告)号：US4620966A

    公开(公告)日：1986-11-04

    申请号：US619057

    申请日：1984-06-11

    申请人： Gunther Schimmel ,  Herbert Ressel ,  Gero Heymer ,  Reinhard Gradl

    发明人： Gunther Schimmel ,  Herbert Ressel ,  Gero Heymer ,  Reinhard Gradl

    IPC分类号： C01B25/30 ,  C01B25/16

    CPC分类号： C01B25/308

    摘要： The disclosure relates to a process for defluorinating alkali metal phosphate solutions. To this end, the disclosure provides for an alkali metal phosphate solution neutralized to a pH-value of more than 6 and pre-purified to be stirred at 60.degree. to 120.degree. C. into an alkaline earth metal compound. Alkaline earth metal compounds with a solubility in water of less than 5 g/l are used in the form of particles of which more than 50% have a size of less than 8 .mu.m. After a reaction period of 0.5 to 4 hours, the precipitate obtained is separated from the purified alkali metal phosphate solution.

    摘要翻译： 本公开涉及一种氟化碱金属磷酸盐溶液的方法。 为此，本公开内容提供将中和至pH值大于6并经60℃至120℃预纯化以进入碱土金属化合物的碱金属磷酸盐溶液。 在水中的溶解度小于5g / l的碱土金属化合物以超过50％的尺寸小于8μm的颗粒的形式使用。 反应时间为0.5〜4小时后，从纯化的碱金属磷酸盐溶液中分离得到的沉淀物。

    Process for making crude phosphoric acid
    2.
    发明授权
    Process for making crude phosphoric acid 失效
    制备粗磷酸的方法

    公开(公告)号：US4780294A

    公开(公告)日：1988-10-25

    申请号：US10333

    申请日：1987-02-03

    申请人： Gunther Schimmel ,  Friedrich Kolkmann ,  Reinhard Gradl ,  Herbert Ressel

    发明人： Gunther Schimmel ,  Friedrich Kolkmann ,  Reinhard Gradl ,  Herbert Ressel

    IPC分类号： C01B25/222 ,  C01B25/22 ,  C01B25/223 ,  C01B25/16 ,  C01B17/16

    CPC分类号： C01B25/2208 ,  C01B25/223

    摘要： Crude phosphoric acid is made by subjecting crude phosphate ore containing sulfide to processing treatment with a mineral acid in a closed system comprised of a processing reactor, a filtering zone and an off-gas scrubbing zone. To this end, a soluble compound of a metal forming difficultly soluble sulfides in the respective acid medium is added either(A) during the processing operation the phosphate ore is subjected to or(B) during the scrubbing operation the off-gas is subjected toand the resulting sulfide precipitate is filtered off in case (A) together with further matter precipitated during the processing operation and, in case (B) separated from the scrubbing liquid.

    摘要翻译： 粗磷酸是通过在含有加工反应器，过滤区和废气洗涤区的封闭系统中，使含有硫化物的粗磷酸盐矿石与无机酸进行处理而制成的。 为此，在各种酸性介质中形成难以溶解的硫化物的金属的可溶性化合物在（a）在磷酸盐矿石经历的处理操作期间或（B）中加入废气进行处理 并且在（A）的情况下将所得的硫化物沉淀与在处理操作期间沉淀的另外的物质一起被滤出，并且在与洗涤液分离的情况下（B）。