公开(公告)号：US06174503B1

公开(公告)日：2001-01-16

申请号：US09146800

申请日：1998-09-03

申请人： Bruce A. Moyer ,  Richard A. Sachleben ,  Peter V. Bonnesen ,  Derek J. Presley

发明人： Bruce A. Moyer ,  Richard A. Sachleben ,  Peter V. Bonnesen ,  Derek J. Presley

IPC分类号： C22B2610

CPC分类号： C22B3/002 ,  C22B26/10 ,  Y02P10/234

摘要： A solvent composition and corresponding method for extracting cesium (Cs) from aqueous neutral and alkaline solutions containing Cs and perhaps other competing metal ions is described. The method entails contacting an aqueous Cs-containing solution with a solvent consisting of a specific class of lipophilic calix[4]arene-crown ether extractants dissolved in a hydrocarbon-based diluent containing a specific class of alkyl-aromatic ether alcohols as modifiers. The cesium values are subsequently recovered from the extractant, and the solvent subsequently recycled, by contacting the Cs-containing organic solution with an aqueous stripping solution. This combined extraction and stripping method is especially useful as a process for removal of the radionuclide cesium-137 from highly alkaline waste solutions which are also very concentrated in sodium and potassium. No pre-treatment of the waste solution is necessary, and the cesium can be recovered using a safe and inexpensive stripping process using water, dilute (millimolar) acid solutions, or dilute (millimolar) salt solutions. An important application for this invention would be treatment of alkaline nuclear tank wastes. Alternatively, the invention could be applied to decontamination of acidic reprocessing wastes containing cesium-137.

摘要翻译： 描述了从含有Cs和可能的其它竞争性金属离子的中性和碱性溶液中提取铯（Cs）的溶剂组成和相应方法。 该方法需要使含水的含Cs溶液与溶解在含有特定类别的烷基 - 芳族醚醇作为改性剂的烃基稀释剂中的特定类别的亲油性杯[4]芳烃 - 冠醚萃取剂组成的溶剂接触。 随后从萃取剂中回收铯值，然后通过使含Cs的有机溶液与水性剥离溶液接触，随后再循环溶剂。 这种组合萃取和汽提方法特别适用于从高碱性废液中去除铯-137的方法，该方法也非常浓缩在钠和钾中。 不需要对废溶液进行预处理，并且可以使用水，稀（毫摩尔）酸溶液或稀（毫摩尔）盐溶液，使用安全且廉价的汽提方法回收铯。 本发明的重要应用是碱性核罐废物的处理。 或者，本发明可以应用于含有铯-137的酸性再处理废物的去污。