公开(公告)号：US4190633A

公开(公告)日：1980-02-26

申请号：US785947

申请日：1977-04-08

申请人： Jay C. Smith ,  Ronald J. Manuel ,  James E. McAllister

发明人： Jay C. Smith ,  Ronald J. Manuel ,  James E. McAllister

IPC分类号： C01B25/234 ,  B01D11/04 ,  C01B25/238 ,  C01B25/46 ,  C22B60/02 ,  C01B25/16

CPC分类号： C22B60/026 ,  B01D11/04 ,  C01B25/238 ,  C01B25/461

摘要： A method for handling the problem of crud formation in the solvent extraction of wet-process phosphoric acid is described. Crud is the name ordinarily given to the thick interfacial layer of semi-floatable material which tends to form and accumulate, and which interferes with many of the extraction processes and, in particular, with the solvent extraction of wet-process phosphoric acid. The method described provides for the operation of the solvent extraction stages in a manner that allows the formation and temporary accumulation of crud in those stages whereupon the solvent and the crud are then removed from the extraction stages and treated in a series of operations which include a clarification step, an acid removal step, a water wash step and a caustic treatment step, which steps effectively separate the solvent from the crud, and remove the crud components from the system and regenerate otherwise unusable solvent.The invention is particularly applicable to the solvent extraction of wet-process phosphoric acid for the recovery of uranium by the reductive stripping technique.

摘要翻译： 描述了在湿法磷酸的溶剂萃取中处理粗屑形成问题的方法。 Crud是通常给予易于形成和积聚的半浮性材料的厚界面层的名称，并且其干扰许多提取方法，特别是与湿法磷酸的溶剂萃取。 所描述的方法提供了溶剂萃取阶段的操作，其允许在那些阶段中形成和临时堆积原油，然后从萃取阶段除去溶剂和原油，并在一系列操作中进行处理，这些操作包括 澄清步骤，酸去除步骤，水洗步骤和苛性碱处理步骤，其有效地将溶剂与原油分离，并从系统中除去原油组分并再生不可用的溶剂。 本发明特别适用于通过还原剥离技术用于回收铀的湿法磷酸的溶剂萃取。