Browsing by Author "Ghosh, MK"

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    Hydrometallurgical application for treating a Nigerian chalcopyrite ore in chloride medium: Part I. Dissolution kinetics assessment
    (Springer, 2013) Alafara, AB; Kuranga, IA; Adekola, FA; Bale, RB; Ghosh, MK; Alabi, AGF; Sheik, AR; Folorunso, IO
    The dissolution kinetics of a Nigerian chalcopyrite ore in hydrochloric acid was studied in this article. Acid concentration, reaction temperature, and ore particle size were chosen as experimental parameters. The chemical and morphological studies of the ore before and after leaching at optimal conditions were carried out by X-ray di®raction (XRD) and scanning electron microscopy (SEM). It is revealed that increasing the acid concentration and system temperature and decreasing the ore particle size greatly enhances the dissolution rate. The dissolution kinetics was found to follow the shrinking core model for the di®usion control mechanism where the activation energy (Ea) of 32.92 kJ¢mol¡1 was obtained for the process and supported by morphological changes at a higher dissolution of 91.33%.
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    Hydrometallurgical Processing of Manganese Ores: A Review
    (Scientific Research, 2014) Baba, AA; Ibrahim, L; Adekola, FA; Bale, RB; Ghosh, MK; Sheik, AR; Pradhan, SR; Ayanda, OS; Folorunso, IO
    Hydrometallurgy is the most suitable extractive technique for the extraction and purification of manganese as compared to all other techniques including biometallurgy and pyrometallurgical processes. In the hydrometallurgical processing of manganese from its ore, the leach liquors often contain divalent ions such as iron, manganese, copper, nickel, cobalt and zinc along with other impurities which make manganese very difficult to separate. The processes employed for solution concentration and purification in the hydrometallurgical processing of manganese include precipitation, cementation, solvent extraction and ion exchange. Solvent extraction also proves more efficient and it plays vital roles in the purification and separation of the manganese as compared to all other techniques. A detailed review of the various steps involved in the hydrometallurgical manganese processing, concentration and purification processes and newer processes of extraction of manganese from ores and waste materials were discussed