Journal of Mining and Metallurgy. Section A: Mining | |
Kinetic study of the manganese mine tailings leaching by organic reductant in sulfuric acid solution | |
El Kacemi Kacem1  Abdallah A.2  Said K.2  El Ass Khalid3  Darmane Y.4  | |
[1] Laboratoire Electrochimie et Chimie Analytique, Université Mohammed-V, Faculté des Sciences de Rabat (FSR), Agdal-Rabat, Morocco;Laboratoire Hydrométallurgie et Environnement, Ecole Nationale Supérieure des Mines de Rabat (ENSMR), Agdal-Rabat, Morocco;Laboratoire de Métrologie de l'Environnement, Ecole Nationale Supérieure des Mines de Rabat (ENSMR), Agdal-Rabat, Morocco;Université Ibn Zohr, Faculté Polydisciplianaire de Ouarzazate, Ouarzazate, Morocco; | |
关键词: Leaching kinetics modeling; Potassium oxalate; Mining manganese residue; Sulfuric acid leaching; | |
DOI : 10.5937/JMMA1501029A | |
来源: DOAJ |
【 摘 要 】
A kinetic study of the leaching of manganese mining residue by sulfuric acid and potassium oxalate has been investigated. The effects of the reaction agitation speed, manganese ore particle size, acid concentration, oxalate concentration and temperature on manganese rate dissolved. The leaching rates are significantly influenced by the Reaction temperature, to both concentration oxalate and acid. The observed effects of the relevant operating variables on the leaching rates are consistent with a kinetic model for chemical control. The apparent activation energy for the leaching of pyrolusite has been calculated using the Arrhenius expression and was found to be (63.7±2.9) kJ/mol. The experimental results indicate a reaction order of 1.07 for [H2SO4] concentration and 0.96 for [K2C2O4]. It is concluded that the reductive leaching of pyrolusite with potassium oxalate in acid medium is controlled by chemical reaction. The rate expression associated with the dissolution rate of pyrolusite depending on the parameters chosen may be summarized as follows: 1 - (1 - x)1/3 = 1.45 10 7/r0.92 0 ∙ [H2SO4]1.07 [K2C2O4]0.96exp(-63735/RT)∙t.
【 授权许可】
Unknown