| 摘要 |
<p>1337336 Extraction of copper CANADIAN PATENTS & DEVELOPMENT Ltd 19 April 1971 [11 March 1970] 23702/71 Heading C1A [Also in Division C7] Copper is separated from aqueous ammoniacal solution which also contains dissolved cobalt and nickel, and has a concentration of at least 50 g./litre ammonium salt, by contacting at pH 6À5-8À5 with anα-hydroxy oxime dissolved in an inert organic diluent which is substantially immiscible with the aqueous solution, and separating the resultant copper loaded organic phase from the remaining aqueous raffinate. A preferred ammonium salt solution has a concentration of 50-300 g./l. of (NH 4 ) 2 SO 4 and contains 0À1-50 g./l. of Cu, Co, and Ni. The contact may be in a multiple stagewise manner. The copper values may be stripped from the organic phase by mineral acid and the resulting aqueous copper salt reduced to the oxide or electrolysed to obtain copper powder. Suitableα-hydroxy amines have structure as illustrated wherein R,R<SP>1</SP> are organic hydrocarbon radicals and R<SP>11</SP> is hydrogen or an organic hydrocarbon radical. Preferred hydrocarbon radicals are alkenyl or branched chain alkyl groups having about 6 to 20 carbon atoms and it is preferred that theα-hydroxy oxime has in all about 14-40 carbon atoms. Reference has been directed by the Comptroller to Specification 1,051,159.</p> |
