Research work on ammonia leaching of the Cu90Co5Fe5 alloy has been carried out. Phase identification of the material examined was made. The alloy dissolving in the ammonia-sulphate solution with an addition of copper ions proceeds spontaneously. During leaching, practically all copper passes to the electrolyte. Iron was not found in the solution. The slime contains mainly compounds of iron and cobalt. Clear dependence between the course of alloy dissolving process and phase composition of the alloy has been proved.
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