Concentrated solutions of oxime metal extractants and method of formulating extractant compositions therefrom
申请人:——
公开号:US20020157572A1
公开(公告)日:2002-10-31
The preparation of concentrated solutions of oxime metal extractants, such as aldoximes and ketoximes, or mixtures of aldoxime and ketoxime, and the use thereof in formulating or preparing extraction reagent compositions for use in an extractant organic phase in a process of extracting metals from aqueous solutions containing metal values; and in particular, to concentrates which are solutions of individual ketoxime or aldoxime or mixtures of water-insoluble hydroxy aldoximes and ketoximes, in varying ratios by weight of 1:100 aldoxime to ketoxime, or conversely, 100:1 ketoxime to aldoxime, in water-immiscible hydrocarbon solvents or equilibrium modifiers. The invention also provides for maintaining stability of concentrates determined by accelerating rate calorimetry to define the ranges of oxime concentration and volume whereby the concentrate will be a stable, flowable, pourable and pumpable concentrate which can be safely stored long term. The extraction compositions may also optionally contain equilibrium modifiers or kinetic additives.
制备肟类金属萃取剂,如醛肟和酮肟,或醛肟和酮肟混合物的浓缩溶液,并将其用于配制或制备萃取试剂组合物,以便在从含有金属价值的水溶液中萃取金属的工艺中用于萃取剂有机相;特别是制备单个酮肟或醛肟,或水不溶性羟基醛肟和酮肟混合物的溶液浓缩物,其重量比为1:在不溶于水的烃类溶剂或平衡调节剂中,醛肟与酮肟的重量比为 1:100,反之,酮肟与醛肟的重量比为 100:1。本发明还提供了保持浓缩物稳定性的方法,通过加速度量热法确定肟的浓度和体积范围,从而使浓缩物成为稳定、可流动、可浇注和可泵送的浓缩物,并可安全地长期储存。萃取组合物还可选择含有平衡调节剂或动力学添加剂。