Logo image
Back
The electrochemistry of the leaching reactions in the caron process. I. anodic processes
Journal article   Peer reviewed

The electrochemistry of the leaching reactions in the caron process. I. anodic processes

A.N. Nikoloski and M. Nicol
ECS Transactions, Vol.2(3), pp.197-207
2006
DOI: https://doi.org/10.1149/1.2196010
url
Link to Published Version *Subscription may be requiredView

Abstract

The Caron process involves the oxidative dissolution of pre-reduced iron alloys containing nickel, cobalt and copper in ammoniacal carbonate solutions. This study has demonstrated that passivation is exhibited by nickel and cobalt at higher potentials than previously established for iron. It is shown that alloys of iron with nickel and cobalt also undergo passivation at low potentials resulting in inhibition of the dissolution of the valuable metals. The potential regions of active dissolution of each of these metals in ammonia-ammonium carbonate solutions have been established. The effect of thiosulphate and cobaltammine complex ions on the dissolution of iron and nickel was found to be significant in that thiosulphate appears to partially prevent the passivation of nickel while the presence of cobaltammine ions leads to lower apparent anodic current densities. Possible mechanisms for the passivation processes and for the effects of thiosulfate and cobaltammines on the dissolution are presented.

Details

Metrics

67 Record Views
Logo image