Kinetics of sulphation of nickel and cobalt ferrites with NaSO4, melt containing Fe3+ Ions

Jacob, K. T. (1987) Kinetics of sulphation of nickel and cobalt ferrites with NaSO4, melt containing Fe3+ Ions Transactions of the Indian Institute of Metals, 40 (5). pp. 383-388. ISSN 0019-493X

Full text not available from this repository.

Official URL:


It has been experimentally established that nickel and cobalt can be extracted from their ferrites with sodium sulphate melt containing femc ions. The kinetics of extraction from synthetic ferrites using a melt of sodium and ferric sulphates of eutectic composition has been studied as a function of the particle size of the ferrite and temperature in the range 900 to 1073 K. The divalent ions in the ferrite exchange with the ferric ion in the melt, leaving a residue of hematite.The rate of reaction conforms to the Crank-Ginstling-Brounshtein diffusion model. The reaction rate is governed by the counter-diffusion of and (or co2+) ions in the hematite lattice. Analytical expressions for the rate constants have been derived from the experimental data as a function of particle size and temperature. The activation energy for the extraction of nickel from nickel ferrite is 154(+10) kJ mol-1 and the corresponding value for cobalt is 142(+10)kJ mol-1. In sulphation roasting of minerals containing nickel, the yield of nickel is generally limited to 75% due to the formation of insoluble ferrites. The use of melts based on sodium sulphate provides a possible route for enhancing the recovery of nickel to approximately 98%.

Item Type:Article
Source:Copyright of this article belongs to Indian Institute of Metals.
Keywords:Iron Ore; Chemical Reaction; Roasting; Ferrite; Temperature Effect; Kinetics; Sodium Sulfate; Free Energy; Thermodynamic Properties; Particle Size Analysis;
ID Code:94836
Deposited On:05 Oct 2012 09:35
Last Modified:05 Oct 2012 09:35

Repository Staff Only: item control page