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1. 发明授权

US4431610A Method of recovering uranium from wet process phosphoric acid 失效
标题翻译：从湿法磷酸中回收铀的方法
公开(公告)号：US4431610A
公开(公告)日：1984-02-14
申请号：US351171
申请日：1982-02-22
申请人： Soichi Asagao , Shinsuke Nakagawa , Naoki Okada , Seizi Yoshikawa
发明人： Soichi Asagao , Shinsuke Nakagawa , Naoki Okada , Seizi Yoshikawa
IPC分类号： C22B60/02 , C01G56/00
CPC分类号： C22B60/0282
摘要： An economically advantageous method of recovering uranium from a wet process phosphoric acid solution through the steps of making hemihydrate gypsum contact with the acid solution thereby transferring uranium from the acid solution into the gypsum, dispersing the U-containing gypsum separated from the acid solution in water to convert the gypsum to dihydrate accompanied by the transfer of uranium into water, separating the obtained U-containing aqueous solution from the dihydrate gypsum, and adding precipitant such as an inorganic base to the aqueous solution to form a precipitate comprising an insoluble uranium compound. The contact of hemihydrate gypsum with the phosphoric acid solution is preferably preceded by reduction of hexavalent uranium in the acid solution to tetravalent uranium, and can be achieved either by adding hemihydrate gypsum to the acid solution or by converting dihydrate gypsum to hemihydrate within the acid solution preferably preceded by the addition of sulfuric acid.
摘要翻译：从湿法磷酸溶液中回收铀的经济上有利的方法是通过使半水石膏与酸溶液接触从而将铀从酸溶液转移到石膏中，将从酸溶液中分离的含U石膏分散在水中将石膏转化成二水合物，伴随着将铀转化成水，从二水石膏中分离得到的含有U的水溶液，并将沉淀剂如无机碱添加到水溶液中以形成包含不溶性铀化合物的沉淀物。半水石膏与磷酸溶液的接触优选之前是将酸溶液中的六价铀还原成四价铀，并且可以通过向酸性溶液中加入半水石膏或通过将二水合石膏转化为酸溶液中的半水合物来实现优选在加入硫酸之前。

2. 发明授权

US4427641A Method of recovering uranium from wet process phosphoric acid with enhanced content of uranium 失效
标题翻译：从含有铀浓度的湿法磷酸中回收铀的方法
公开(公告)号：US4427641A
公开(公告)日：1984-01-24
申请号：US287151
申请日：1981-07-27
申请人： Seizi Yoshikawa , Ryuichi Nakamura
发明人： Seizi Yoshikawa , Ryuichi Nakamura
IPC分类号： C01G43/00 , C01B25/222 , C01B25/226 , C01B25/229 , C01B25/231 , C22B60/02 , B01D11/00 , B01F11/00 , C01B25/16
CPC分类号： C01B25/231 , C01B25/226 , C01B25/229 , C22B60/0282
摘要： In preparing wet process phosphoric acid by decomposing a phosphate rock containing uranium with sulfuric acid and phosphoric acid on condition that hemihydrate gypsum is formed in an acid solution either at the stage of decomposing the phosphate rock or subsequently, uranium contained in the phosphate rock can almost entirely be retained in the obtained phosphoric acid solution by forming the hemihydrate gypsum in the presence of an oxidizing agent, such as a soluble chlorate, hydrogen peroxide or oxygen gas, in the acid solution in a quantity sufficient to render the entire uranium dissolved in the acid solution hexavalent because hemihydrate gypsum adsorbs almost exclusively tetravalent ions of uranium. The uranium is then recovered.
摘要翻译：在通过用硫酸和磷酸分解含有铀的磷酸盐岩的条件下制备湿法磷酸，条件是在酸性溶液中形成半石膏，或者在分解磷酸盐岩或随后的磷酸盐岩中所含的铀几乎可以通过在酸溶液中在可溶性氯酸盐，过氧化氢或氧气等氧化剂的存在下形成半水石膏，使其完全保留在所得磷酸溶液中，其量足以使整个铀溶解在酸溶液六价，因为半水石膏几乎只吸收铀的四价离子。然后回收铀。

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