Nickel oxide in an Indian chromitiferous overburden was reduced with a CO-CO2-N-2 gas mixture and the effects of various operating parameters, such as roasting temperature, time and P-CO, Were studied. An extraction of more than 90% nickel was achieved by ammoniacal leaching of ore that had been reduced for Ih at 760 degrees C under a gas mixture with a volumetric CO/(CO + CO2) ratio of 0.57. The kinetic data were found to conform to the Ginstling-Brounstein equation. The applicability of this model was confirmed by evaluating the apparent activation energy with the use of independently constructed differential and integral plots.
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