公开(公告)号：US4334999A

公开(公告)日：1982-06-15

申请号：US240186

申请日：1981-03-03

申请人： David A. Cornwell

发明人： David A. Cornwell

IPC分类号： B01D11/02 ,  C22B3/38 ,  B01D11/00 ,  C02F1/26 ,  C02F1/42

CPC分类号： B01D11/028 ,  C22B3/0068 ,  C22B3/0087 ,  Y02P10/234

摘要： A process for extracting metal ions from a water insoluble metal base or salt dispersed in an aqueous solution using liquid ion exchange is described. The liquid ion exchange extractant is an alkyl phosphoric acid or acid phosphate (APA) which is dissolved in a water immiscible organic solvent. In contrast to prior art processes where the metal ion is dissolved in an aqueous solution, the insoluble metal base or salt is one which is reactive from an aqueous solution with the APA to replace one of the acid hydrogens to form an alkyl phosphate metal salt (APS) in the organic solvent. The metal ion can be recovered from the APS in the organic solvent by stripping with an aqueous acidic solution so that the metal ion is removed from the APS to form a metal salt in the aqueous acidic solution and the APA in the organic solvent is regenerated for reuse. The process is particularly adapted to producing alum from aluminum hydroxide which is dispersed in an aqueous sludge resulting from precipitation or coagulation with alum in potable water clarification. The aluminum ion is extracted by the APA from the aluminum hydroxide and then recovered by using an aqueous solution of sulfuric acid to remove the aluminum ion and to form aluminum sulfate in an acidic aqueous solution, referred to as "liquid alum", which can be reused.

摘要翻译： 描述了使用液体离子交换从分散在水溶液中的水不溶性金属基质或盐提取金属离​​子的方法。 液体离子交换萃取剂是溶解在与水不混溶的有机溶剂中的烷基磷酸或酸式磷酸酯（APA）。 与金属离子溶解在水溶液中的现有技术方法相反，不溶性金属碱或盐是与APA的水溶液反应以代替其中一个酸氢形成磷酸烷基磷酸金属盐的方法 APS）在有机溶剂中。 金属离子可以通过用酸性水溶液汽提从有机溶剂中的APS中回收，以使金属离子从APS中除去，从而在酸性水溶液中形成金属盐，再生有机溶剂中的APA再生 重用。 该方法特别适用于由氢氧化铝产生明矾，其分散在由饮用水澄清中的明矾沉淀或凝结而产生的水性污泥中。 铝离子由APA从氢氧化铝中提取，然后通过使用硫酸水溶液回收以除去铝离子并在酸性水溶液中形成硫酸铝，称为“液体明矾”，其可以是 重复使用