A process for recovery of copper from an aqueous ammoniacal solution containing copper values comprising:
(A) contacting a copper pregnant aqueous ammoniacal solution containing copper values with a water insoluble beta-diketone copper extractant dissolved in a water-immiscible organic solvent to extract copper values from said aqueous ammoniacal solution into said organic solution thereby forming a copper pregnant organic phase and a copper depleted aqueous phase;
(B) separating said aqueous phase and said organic phase;
(C) contacting the copper pregnant organic phase with an aqueous acidic stripping solution;
(D) separating said aqueous acidic stripping solution now containing the copper values from the organic phase; and
(E) recovering the copper from said aqueous acidic stripping solution; characterized in that the beta-diketone extractant being a highly sterically hindered beta-diketone selected from beta-diketones of formula II:
where R is phenyl or alkyl substituted phenyl, R' is alkyl having from above 1 to 8 carbon atoms, and R", R"' and R"" are the same or different and are chosen from the group consisting of H, alkyl having from 1 to 8 carbon atoms, and aralkyl having from 7 to 14 carbon atoms, with the proviso that (a) less than two of R", R"' and R"" are H and (b) the total number of carbons in all R groups is at least 13.
一种从含
铜值的
氨水溶液中回收
铜的工艺,包括
(A) 将含有
铜价的含
铜氨水溶液与溶解在不溶于
水的有机溶剂中的
β-二酮铜萃取剂接触,以将
铜价从所述
氨水溶液中萃取到所述有机溶液中,从而形成含
铜有机相和耗
铜水相;
(B) 分离所述
水相和所述有机相;
(C) 将含
铜有机相与酸性剥离
水溶液接触;
(D) 从有机相中分离出现在含有
铜值的所述酸性
水汽提溶液;以及
(E) 从所述
水性酸性剥离溶液中回收
铜;其特征在于,所述
β-二酮萃取剂是选自式 II 的
β-二酮的高立体阻碍
β-二酮:
其中R是苯基或烷基取代的苯基,R'是具有1至8个以上碳原子的烷基,R"、R"'和R""相同或不同,选自由H、具有1至8个碳原子的烷基和具有7至14个碳原子的芳烷基组成的组,但条件是(a)R"、R"'和R""中少于两个是H,(b)所有R基团的碳总数至少为13。