Processing Nigerian pyrolusite ore, Part I: Characterization and dissolution kinetics analysis

CIM Journal, Vol. 7, No. 1, 2016

A. A. Baba et L. Ibrahim
Department of Industrial Chemistry, University of Ilorin, Ilorin, Nigeria

R. B. Bale
Department of Geology and Mineral Sciences, University of Ilorin, Ilorin, Nigeria

A. G. F. Alabi
Department of Materials and Metallurgical Engineering, University of Ilorin, Ilorin, Nigeria (currently Department of Material Science and Engineering, Kwara State University, Malete, Nigeria)

F. A. Adekola
Department of Industrial Chemistry, University of Ilorin, Ilorin, Nigeria

M. K. Ghosh, K. Sanjay, et A. R. Sheik
Hydro and Electrometallurgy Department, Council of Scientific and Industrial Research (CSIR)-Institute of Minerals and Materials Technology, Bhubaneswar, India

http://dx.doi.org/10.15834/cimj.2016.5
Résumé Le présent article étudie la caractérisation et la dissolution d’un minerai de pyrolusite du Nigeria, il donne les résultats des analyses physicochimiques du minerai et de la caractérisation détaillée du minerai avant et après la lixiviation sous des conditions optimales. Le taux de dissolution du minerai augmentait proportionnellement à la concentration de l’acide mais décroissait avec la taille des particules. Dans une solution 4 M H2SO4 à 80 °C, avec une granulométrie de –90+75 μm et une agitation modérée, le taux de dissolution du minerai a atteint 78,7 %. Les résidus produits sous des conditions optimales de lixiviation étaient constitués de silice avec un mélange de cristobalite et de stishovite. L’énergie calculée d’activation supportait le mécanisme de contrôle de la diffusion proposé pour le procédé.
Mots clés : Caractérisation, cinétique de dissolution, lixiviation, minerai de pyrolusite, Nigeria, solution d’acide sulfurique
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