Two-stage fluid bed reduction of manganese nodules

Details Two-stage fluid bed reduction of manganese nodules Two-stage fluid bed reduction of manganese nodules

C - Chemistry, Metallurgy

22

B

53/284, 53/299,

C22B 5/12 (2006.01) C22B 1/10 (2006.01) C22B 3/00 (2006.01) C22B 3/14 (2006.01) C22B 5/14 (2006.01) C22B 47/00 (2006.01)

Patent

CA 1050281

ABSTRACT OF THE DISCLOSURE Process in which manganese nodules are treated to enable metal values to be recovered. manganese ore nodules are treated in a two-stage fluid bed process to produce a leachable product. In the first stage, dried nodules are calcined using direct fuel injection under a a neutral or slightly oxidizing atmosphere to remove about one-half of the oxygen content. Subsequently, in the second stage, the calcined nodules are reduced with synthesis gas to render the metal value leachable. The metal values such as copper and nickel are leached from the reduced nodules with an ammonia-ammonium carbonate leach solution.

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