C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
204/66
C25C 1/00 (2006.01) C22B 47/00 (2006.01)
Patent
CA 1064854
ABSTRACT OF THE DISCLOSURE Metal values are extracted from marine polymetallic modules by a hydrometallurgical process of moderate capital cost. The process comprises the following steps in succession: a) melting the nodules under reducing conditions to obtain A concentrate containing at least nickel, copper, cobalt and a part of the iron in the nodules; b) reacting gaseous chlorine with the metal concentrate in an aqueous medium thereby to obtain an aqueous solution contain- ing chlorides of nickel, cobalt, copper and iron, and removing any solid matter from the aqueous solution; c) pracipitating the copper contained in the aqueous solu- tion using a more electropositive metal powder, and preferably melting and casting the precipitate into anodes; d) electro-refining the copper precipitate anodes; e) purifying the aqueous solution and removing the cobalt and iron therefrom by contacting the aqueous solution with organic phases for liquid-liquid ion-exchange; and f) re-extracting the cobalt and iron from the organic phase by contacting the organic phase with an aqeuous re-extrac- tion phase. Preferably also the aqueous solution resulting from step (e) is electrolysed to yield nickel. In addition, at least one of the aqueous re-extraction phases from step (f) can be (and desirably is) electrolysed to yield iron and /or cobalt.
231165
Gandon Louis
Jean Roger
Solar Serge
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