A process for extracting metal values especially zinc values from aqueous solutions of metal salts which comprises contacting the aqueous solution with an organic phase comprising a compound of the formula: ##STR1## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4, independently, represents a substituted hydrocarbyl or hydrocarbyloxy group or R.sup.1 and R.sup.2 together with the attached phosphorus atom and/or R.sup.3 and R.sup.4 together with the attached phosphorus atom form a 5- to 8-membered heterocyclic ring.
一种从
金属盐
水溶液中提取
金属价值,特别是
锌价值的过程,其包括将
水溶液与含有下式化合物的有机相接触:##STR1## 其中R.sup.1、R.sup.2、R.sup.3和R.sup.4中的每个都独立地表示取代的烃基或烃氧基,或者R.sup.1和R.sup.2与所附
磷原子一起,或者R.sup.3和R.sup.4与所附
磷原子一起形成一个5-至8-成员杂环环。