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31. 发明授权

US4556548A Process for purifying wet-processed phosphoric acid 失效
标题翻译：净化湿法磷酸的方法
公开(公告)号：US4556548A
公开(公告)日：1985-12-03
申请号：US557349
申请日：1983-12-01
申请人： Reinhard Gradl , Hilmar Roszinski
发明人： Reinhard Gradl , Hilmar Roszinski
IPC分类号： C01B25/01 , C01B25/46 , C01B25/16 , C01B15/16 , C01B25/26 , C01F1/00
CPC分类号： C01B25/01 , C01B25/461 , C01B25/462
摘要： 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 in a single process step the extraction--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;(c) for the aqueous phosphoric acid raffinate produced in stage (a) to be neutralized, if desired, after prior removal of residual solvent, for it to be subjected to treatment with an alkaline agent with the resultant formation of a purified phosphate salt solution and precipitation of a so-called neutralization sludge, and(d) for said neutralization sludge and simultaneously obtained alkali metal phosphate solution to be separated from each other, for the sludge to be mixed with finely ground phosphate ore, and for the mixture to be made into phosphate pellets for use in electrothermal phosphorus production.
摘要翻译：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; （c）如果需要，在步骤（a）中制备的磷酸残液水溶液在预先除去残留溶剂之后，用碱性试剂处理，形成纯化的磷酸盐溶液和所谓的中和污泥的沉淀，（d）对于所述中和污泥并同时获得的碱金属磷酸盐溶液彼此分离，用于与精细研磨的磷酸盐矿石混合的污泥，混合物为制成用于电热磷生产的磷酸盐颗粒。

32. 发明授权

US4503016A Process for extracting heavy metal ions from aqueous solutions 失效
标题翻译：从水溶液中提取重金属离子的方法
公开(公告)号：US4503016A
公开(公告)日：1985-03-05
申请号：US582138
申请日：1984-02-23
申请人： G/u/ nther Schimmel , Werner Krause , Reinhard Gradl
发明人： G/u/ nther Schimmel , Werner Krause , Reinhard Gradl
IPC分类号： C02F1/26 , C01B25/238 , C02F1/62 , C22B3/38 , C01G3/00 , C01G9/00 , C01G11/00 , C01G28/00
CPC分类号： C22B3/007 , C01B25/238 , Y02P10/234 , Y10S423/14
摘要： The disclosure relates to a process for liquid/liquid-extraction of heavy metal ions from acid aqueous solutions with the aid of water-insoluble dithiophosphoric acid diesters as extracting agents. More particularly, use is made of phosphoric acid solutions with a P.sub.2 O.sub.5 -content of from 3 to 80 weight %, the solutions being free from emulsion-forming organic contaminants or having previously been freed therefrom in known manner. The resulting aqueous phase is separated from the phase containing the dithiophosphoric acid diester.
摘要翻译：本公开涉及借助于不溶于水的二硫代磷酸二酯作为提取剂从酸性水溶液中液/液萃取重金属离子的方法。更具体地，使用P2O5含量为3至80重量％的磷酸溶液，该溶液不含乳液形成有机污染物，或者已知以已知的方式从其中释放出来。将得到的水相与含有二硫代磷酸二酯的相分离。

33. 发明授权

US4321245A Process for the purification of wet-processed phosphoric acid 失效
标题翻译：纯化湿法磷酸的方法
公开(公告)号：US4321245A
公开(公告)日：1982-03-23
申请号：US205172
申请日：1980-11-10
申请人： Reinhard Gradl , Klaus Schrodter , Klaus-Peter Ehlers
发明人： Reinhard Gradl , Klaus Schrodter , Klaus-Peter Ehlers
IPC分类号： C01B25/234 , C01B25/46 , C01B25/16
CPC分类号： C01B25/462 , C01B25/461
摘要： The invention relates to a process for the purification of wet-processed phosphoric acid with the aid of organic solvents which are immiscible or only partially miscible with water, the sulfate ions being removed by addition of barium compounds. The purification is carried out in an n-stage extraction installation, where n is equal to or greater than 5. The barium compound is added to the phosphoric acid to be purified, and the resulting mixture is fed to the top of the extraction installation, in which the organic solvent phase is dispersed in the aqueous phase. The sulfuric acid is led in counter-current fashion to the phosphoric acid by adding it to one of the stages n=4 to at most n-1.
摘要翻译：本发明涉及一种借助有机溶剂净化湿法磷酸的方法，所述有机溶剂是不混溶的或仅与水部分混溶，通过加入钡化合物除去硫酸根离子。纯化在n级提取装置中进行，其中n等于或大于5.将钡化合物加入待纯化的磷酸中，并将所得混合物进料至萃取装置的顶部，其中有机溶剂相分散在水相中。硫酸通过将其添加到n = 4至n-1个中的一个阶段中，以相反的方式引入磷酸。

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