Murdoch University Research Repository

Welcome to the Murdoch University Research Repository

The Murdoch University Research Repository is an open access digital collection of research
created by Murdoch University staff, researchers and postgraduate students.

Learn more

The reductive leaching of manganese dioxide: Reaction kinetic models and mechanisms

Senanayake, G. (2003) The reductive leaching of manganese dioxide: Reaction kinetic models and mechanisms. In: Hydrometallurgy 2003: Proceedings of the 5th International Symposium, 24 - 27 August, Vancouver, Canada pp. 485-500.


Iron(II), sulphur dioxide and sugars such as lactose are potential reducing agents for manganese dioxide to produce manganese(II) for subsequent hydrometallurgical treatment. The leaching of limonitic laterite and manganiferrous ores with sulphur dioxide produces iron(II) which in turn can catalyse the leaching of manganese dioxide in acid media. This paper presents a critical analysis of the kinetics of reductive dissolution of synthetic manganese dioxide and manganese ore to compare and contrast the effect of sulphur dioxide and iron(II) in acid media containing sulphate or perchlorate anions. Both one-electron and two-electron mechanisms are considered in the case of sulphur dioxide. The current knowledge on chemical speciation is used to construct an Eh-pH diagram to show the effect of complexation of Mn(II), Fe(II) and Fe(III) with sulphate. Heterogeneous and electrochemical reaction kinetic models are combined to propose reaction mechanisms which rationalize the dissolution kinetics.

Item Type: Conference Paper
Murdoch Affiliation(s): Parker Cooperative Research Centre for Integrated Hydrometallurgy Solutions
Item Control Page Item Control Page