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    Process of preparing virtually cadmium-free calcium sulphate and calcium sulphate prepared according to this process
    11.
    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。

    Verfahren zur Gewinnung Cadmium-freier Rohphosphorsäure
    14.
    发明公开
    Verfahren zur Gewinnung Cadmium-freier Rohphosphorsäure 无效
    Verfahren zur Gewinnung镉自由Rohphosphorsäure。

    公开(公告)号：EP0074556A1

    公开(公告)日：1983-03-23

    申请号：EP82107985.2

    申请日：1982-08-31

    申请人： HOECHST AKTIENGESELLSCHAFT

    发明人： von Plessen, Helmond, Dr. ,  Bodenbenner, Kurt, Dr. ,  Baechle, Hans Tuisko, Dr.

    IPC分类号： C01B25/238 ,  C01G11/02

    CPC分类号： C05B7/00 ,  C01B25/2216

    摘要： Calciumphosphat enthaltendes Rohphosphat wird mit Salpetersäure aufgeschlossen und gebildetes Calciumnitrat nach dem Odda-Verfahren entfernt. Die zurückbleibende Rohphosphorsäure wird mit NH 3 auf pH-Werte von 0,9 - 1,5 eingestellt. Anschließend wird Cadmium als Sulfid gefällt und der Niederschlag abgetrennt. Die gereinigte Lösung läßt sich zu schwermetallfreiem Phosphatdünger verarbeiten.

    摘要翻译： 1.一种从粗磷酸盐制备无镉粗磷酸的方法，通过用硝酸消化粗磷酸盐，除去形成的硝酸钙的主要部分，使得含有镉原料的含磷酸的水溶液具有 含有大约30-35％的HNO3，15-20％的P2O5和7-10％的CaO残留，并且通过向粗磷酸中加入氨，其包括用氨调节该粗磷酸的pH值至0.9 加入硫化氢并从含磷酸盐的粗分离含有硫化镉的沉淀物。

    PROCESS FOR THE REMOVAL OF HEAVY METALS FROM A PHOSPHORIC ACID CONTAINING COMPOSITION
    15.
    发明公开
    PROCESS FOR THE REMOVAL OF HEAVY METALS FROM A PHOSPHORIC ACID CONTAINING COMPOSITION 审中-公开

    公开(公告)号：EP3964478A1

    公开(公告)日：2022-03-09

    申请号：EP20195118.3

    申请日：2020-09-08

    申请人： Yara International ASA

    发明人： Kita, Patrycja ,  Jørgensen, Tom Rames ,  Vojnovic, Tanja ,  Bøyesen, Katrine Lie

    IPC分类号： C01B25/238 ,  C02F1/00 ,  C22B3/38

    摘要： The present disclosure provides improved methods for the removal of heavy metals, in particular cadmium, from an aqueous phosphoric acid containing composition, using an organothiophosphorous heavy metal precipitating agent to said composition, wherein the reaction between the heavy metals, in particular cadmium, and the organothiophosphorous precipitating agent is performed at a pH ranging between 1.6 and 2.2, particularly ranging between 1.6 and 2.0. Advantageously, an ionic polymer, particularly a cationic and/or an anionic poly(meth)acrylamide copolymer may be used to promote heavy metal precipitation and/or to facilitate the removal of the precipitates from the composition. More in particular, the phosphoric acid containing composition is obtained by the acid digestion of phosphate rock, preferably by nitric acid, sulfuric acid, or a combination thereof.

    Purification of phosphoric acid rich streams
    17.
    发明公开
    Purification of phosphoric acid rich streams 有权
    ReinigungphosphororsäurereicherStröme

    公开(公告)号：EP1970349A2

    公开(公告)日：2008-09-17

    申请号：EP08152753.3

    申请日：2008-03-14

    申请人： NIRO Process Technology B.V.

    发明人： Scholz, Reinhard Uwe ,  Ruemekorf, Ray Sircy

    IPC分类号： C01B25/234 ,  C01B25/238

    CPC分类号： C01B25/234 ,  C01B25/238

    摘要： The invention relates to a method for the purification or recovery of orthophosphoric acid rich streams by suspension-based melt crystallization. The orthophosphoric acid is crystallized as the hemi-hydrate form and subsequent separation of such crystals in a wash-column produce a high purity acid/water solution that has been depleted of most of the metals and impurities other than water, thereby separating an orthophosphoric acid rich feed liquor into an ultra-pure orthophosphoric acid hemi-hydrate and a mother liquor containing almost all impurities originally present in the feed. The orthophosphoric acid rich feed liquor typically contains no more than 15wt% water and 1wt% other impurities. Individual metal ion composition in the purified orthophosphoric acid product is in the range of 100 to1000 ppb (parts per billion = 1/1000 ppm) of each metal ion. The metal ion composition of the resulting purified product is thus typically below the detection limit of typical analysis equipment.

    摘要翻译： 本发明涉及通过基于悬浮液的熔融结晶来纯化或回收富含正磷酸的料流的方法。 正磷酸作为半水合物形式结晶，随后在洗涤塔中分离这种晶体产生高纯度的酸/水溶液，其已经耗尽大部分除水以外的金属和杂质，从而分离出正磷酸 富含原料液转化为超纯正磷酸半水合物和含有原料存在于饲料中几乎所有杂质的母液。 正磷酸的进料液体通常含有不超过15重量％的水和1重量％的其它杂质。 纯化的正磷酸产物中的各种金属离子组成在每个金属离子的100至1000ppb（每十亿分之一1/1000ppm）的范围内。 因此，所得纯化产物的金属离子组成通常低于典型分析设备的检测限。