ABSTRACT Studies on the kinetics of dissolution of a Nigerian lateritic soil in acids media including
hydrochloric, nitric and sulphuric acids have been undertaken. The elemental and mineralogical
characterization, loss of mass on ignition, moisture content and pH of the material suspension in
water were determined. The effects of acid concentration, process temperature, stirring rate and
particle size on the dissolution rate were investigated. Experimental results indicated that
laterite dissolution was greatly influenced by hydrogen ion concentration and the leaching data
fitted a diffusion model. The linear dependence of the rate constant k on 1/ro2 supported the
proposed kinetic model. Values of 60.23 kJmol-1, 64.31 kJmol-1 and 67.53 kJmol-1 were obtained
for the activation energies of laterite dissolution in hydrochloric, nitric and sulphuric acids
respectively; and the order of reaction was approximately one with respect to each of the three
Cite this paper
O. AYANDA, F. ADEKOLA, A. BABA, O. FATOKI and B. XIMBA, "Comparative Study of the Kinetics of Dissolution of Laterite in some Acidic Media," Journal of Minerals and Materials Characterization and Engineering, Vol. 10 No. 15, 2011, pp. 1457-1472. doi: 10.4236/jmmce.2011.1015113.
 Aleva, G. J. J., 1994, Laterites: Concept, Geology, Morphology and Chemistry, ISRIC,
Wageningen, the Netherlands, ISBN 90-6672-053-0.
Hudson, R. 2005, Using Laterite, AquaBotanic, Salem.
Schellmann, W., 1983, “Geochemical Principles of Lateritic Nickel Ore Formation.”
Proceedings of the International Seminar on Laterization Processes, Sao Paulo, 119-135.
Bardossy, G., and Aleva, G. J. J., 1990, “Lateritic Bauxites.” Development in Economic
Geology, 27, 624.
Olanipekun, E. O., 2000, “Kinetics of leaching laterite.” International Journal of Mineral
Processing, 60, 9-14.
Aydogan, S., Aras, A., and Canbazoglu, M., 2005, “Dissolution kinetics of Sphalerite in
acidic ferric chloride leaching.” Chemical Engineering Journal, 114, 67-72.
Baba, A. A., Adekola, A. F., and Bale, R. B., 2009, “Development of a combined pyro- and
hydro-metallurgical route to treat spent zinc-carbon batteries.” Journal of Hazardous
Materials, 171, 838-844.
Madhuchhanda, M., Devi, N. B., Rao, K. S., Rath, P. C., and Paramguru, R. K., 2000,
“Oxidation of Sphalerite in Hydrochloric acid medium in the presence of manganese
dioxide.” The Inst. of Min. and Metallurgy, 109, C150-C155.
Antonijevic, M. M., Jankovic, Z. D., and Dimitrijeviv, M. D., 2004, “Kinetics of Chalcopyrite
dissolution by hydrogen peroxide in Sulphuric acid.” Hydrometallurgy, 71, 329-334.
Ucar, G., 2009, “Kinetics of Sphalerite dissolution by sodium chlorate in hydrochloric Acid.”
Hydrometallurgy, 95, 39-43.
Stopic, S., Friedrich, B., and Fuch, R., 2003, “Kinetics of sulphuric acid leaching of the
Serbian nickel laterite ore under atmospheric pressure.” Metalurgica Journal of Metallurgy,