Development of a new cobalt recovery process at the …
Nonoc's mixed Ni-Co sulphides leached in a NH3- (NH4) 2C03 solution under optimized con- ditions resulted in over 95% Ni and Co extractions. Other impurities such as Fe, Mn, Mg and Si02 were rejected as insoluble oxides. The filtered liquor being relatively free of impurity elements considerably simplifies the solution purification route.