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    Process for purifying wet-processed phosphoric acid
    1.
    发明授权
    Process for purifying wet-processed phosphoric acid 失效
    净化湿法磷酸的方法

    公开(公告)号：US4596703A

    公开(公告)日：1986-06-24

    申请号：US557111

    申请日：1983-12-01

    Applicant: Reinhard Gradi ,  Gero Heymer ,  Gunther Schimmel

    Inventor： Reinhard Gradi ,  Gero Heymer ,  Gunther Schimmel

    IPC: C01B25/234 ,  C01B25/46 ,  C01B25/16 ,  C01B15/16 ,  C01B25/26

    CPC classification number: C01B25/461 ,  C01B25/462

    Abstract: The disclosure relates to a process for purifying crude, concentrated wet-processed phosphoric acid. To this end, the disclosure provides:(a) for the organic solvent to be mixed with the starting product in a ratio by volume of more than 4:1 to effect the extraction in a single process step--from the crude wet-processed phosphoric acid--of a quantity of phosphoric acid necessary for 40 to 70 weight % of the P.sub.2 O.sub.5 used to go into the organic phase, and for the resulting aqueous phosphoric acid raffinate to contain at most 28-32 weight % P.sub.2 O.sub.5, and for the organic phosphoric acid solution to be separated from the phosphoric acid raffinate;(b) for the separated organic phosphoric acid solution to be scrubbed with a quantity of scrubbing solution corresponding at most to 5% of the volume of the phosphoric acid solution; for the scrubbing solution to be recycled into stage (a), and for purified phosphoric acid and phosphate salt solution, respectively, to be recovered in known manner from the scrubbed phosphoric acid solution; and(c) for the aqueous phosphoric acid raffinate produced in stage (a), if desired after prior removal of residual solvent therefrom, to be directly utilized or subjected to known purifying treatment.

    Abstract translation: 本公开涉及纯化粗浓缩湿法磷酸的方法。 为此，本公开内容提供：（a）使有机溶剂与起始产物以体积比大于4:1的比例混合以在单一工艺步骤中进行萃取，从粗制湿法磷酸 酸为一定量的磷酸，用于进入有机相中的40〜70重量％的P2O5，所得到的磷酸提取液含有最多28-32重量％的P2O5，对于有机磷酸 酸性溶液与磷酸提余液分离; （b）对于待洗涤的分离的有机磷酸溶液，其量为相当于磷酸溶液体积的至多5％的洗涤溶液; 将洗涤溶液再循环到阶段（a）中，分别用纯化的磷酸和磷酸盐溶液从已洗涤的磷酸溶液中以已知方式回收; 和（c）如果需要，在步骤（a）中制备的磷酸残液水溶液中，在预先除去残余溶剂之后，直接使用或进行已知的纯化处理。

    Process for defluorinating alkali metal phosphate solutions
    3.
    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

    Applicant: Gunther Schimmel ,  Herbert Ressel ,  Gero Heymer ,  Reinhard Gradl

    Inventor： Gunther Schimmel ,  Herbert Ressel ,  Gero Heymer ,  Reinhard Gradl

    IPC: C01B25/30 ,  C01B25/16

    CPC classification number: C01B25/308

    Abstract: 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.

    Abstract translation: 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 removing fluorine and organic compounds from prepurified wet processed phosphoric acid
    4.
    发明授权
    Process for removing fluorine and organic compounds from prepurified wet processed phosphoric acid 失效
    从预纯化湿法磷酸中除去氟和有机化合物的方法

    公开(公告)号：US4539192A

    公开(公告)日：1985-09-03

    申请号：US625456

    申请日：1984-06-28

    Applicant: Gunther Schimmel ,  Reinhard Gradl ,  Gero Heymer

    Inventor： Gunther Schimmel ,  Reinhard Gradl ,  Gero Heymer

    IPC: C01B25/234 ,  C01B25/237 ,  C01B25/46 ,  C01B25/16

    CPC classification number: C01B25/461 ,  C01B25/237

    Abstract: The disclosure provides for phosphoric acid to be freed in a single process stage from fluorine and organic contaminants. To this end, the disclosure provides for the acid to be introduced into the upper portion of a closed structural element, for it to be treated therein at elevated temperature and pressure with steam flowing countercurrently to the acid, and for the acid so treated to be reacted in the lower portion of the structural element with hydrogen peroxide. The disclosure also provides an apparatus for carrying out the process.

    Abstract translation: 本公开提供在单一工艺阶段中从氟和有机污染物中释放的磷酸。 为此，本公开提供了将酸引入封闭结构元件的上部，以使其在升高的温度和压力下被处理，其中蒸汽与酸反向流动，并且对于被酸处理的酸 在结构元件的下部与过氧化氢反应。 本公开还提供了一种用于执行该过程的装置。

    Recovery of uranium from wet-process phosphoric acid
    5.
    发明授权
    Recovery of uranium from wet-process phosphoric acid 失效
    从湿法磷酸中回收铀

    公开(公告)号：US4460549A

    公开(公告)日：1984-07-17

    申请号：US229978

    申请日：1981-01-30

    Applicant: Gunther Schimmel ,  Reinhard Gradl ,  Gero Heymer

    Inventor： Gunther Schimmel ,  Reinhard Gradl ,  Gero Heymer

    IPC: B01D11/04 ,  C01G43/00 ,  C22B60/02

    CPC classification number: C22B60/026 ,  Y02P10/212

    Abstract: The present invention relates to a process for recovering uranium from raffinate which is obtained by extracting phosphoric acid from a uranium-containing wet-process phosphoric acid with the aid of organic extractants and separating the resulting organic phosphoric acid extract from residue not taken up by the extract. To this end, the raffinate residue is subjected to thermal treatment and thereby freed from dissolved or emulsified residual extractant. Next, the raffinate is treated with a water-immiscible solvent to extract the uranium, and the extracted uranium is separated from the undissolved raffinate portion.

    Abstract translation: 本发明涉及从萃余液中回收铀的方法，该方法是通过有机萃取剂从含铀的湿法磷酸中提取磷酸而得到的，并将所得的有机磷酸提取物从不被 提取。 为此，对残液进行热处理，从而除去溶解或乳化残渣的萃取剂。 接下来，用不与水混溶的溶剂处理萃余液以提取铀，并将萃取的铀与未溶解的萃余液部分分离。

    Continuous process for complete removal or organic impurities from and complete decolorization of prepurified wet-process phosphoric acid
    7.
    发明授权
    Continuous process for complete removal or organic impurities from and complete decolorization of prepurified wet-process phosphoric acid 失效
    用于完全去除或有机杂质的连续方法和完全脱湿的湿法磷酸完全脱色

    公开(公告)号：US4906445A

    公开(公告)日：1990-03-06

    申请号：US311640

    申请日：1989-02-16

    Applicant: Gunther Schimmel ,  Gerhard Bettermann ,  Gero Heymer ,  Friedrich Kolkmann

    Inventor： Gunther Schimmel ,  Gerhard Bettermann ,  Gero Heymer ,  Friedrich Kolkmann

    IPC: C01B25/234 ,  C01B25/235 ,  C01B25/46

    CPC classification number: C01B25/461 ,  C01B25/235

    Abstract: A continuous process is indicated for complete removal of organic impurities from and complete decolorization of pre-purified wet-process phosphoric acid which has been purified by an extractive method using an organic solvent, freed from residual hydrofluoric acid by steam stripping and treated with hydrogen peroxide at elevated temperature, which comprises mixing the pre-purified wet-process phosphoric acid and the hydrogen peroxide in a mixing zone at a temperature of from 100.degree. to 200.degree. C., preferably 140.degree. to 160.degree. C., and allowing them to react at this temperature for a further 1 to 4 hours, cooling to from 85.degree. to 90.degree. C. the pre-purified wet-process phosphoric acid treated in this way and pumping it at this temperature with exclusion of air firstly through an activated charcoal bed which has been prepared on the basis of peat and has been steam-activated and has a BET surface area of from 800 to 1000 m.sup.2 /g, and subsequently through a silicon carbide and/or graphite bed while maintaining a pumping rate of less than 0.5 m.sup.3 /h of wet-process phosphoric acid per m.sup.3 of activated charcoal bed.

    Abstract translation: 指示完全除去有机杂质并完全脱色预纯化的湿法磷酸的连续方法，其通过萃取方法使用有机溶剂纯化，通过汽提除去残留的氢氟酸并用过氧化氢处理 在高温下，其包括在预先纯化的湿法磷酸和过氧化氢的混合区中在100至200℃，优选140至160℃的温度下混合，并使它们 在该温度下再反应1至4小时，冷却至85℃至90℃，预纯化的湿法磷酸以此方式处理并在该温度下泵送，首先通过活性炭排除空气 基于泥炭制备并已蒸汽活化并具有800至1000m2 / g的BET表面积的床，随后通过碳化硅和/或石墨b 同时保持每立方米活性炭床的湿法磷酸的泵送速率小于0.5m 3 / h。

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