𝔖 Bobbio Scriptorium
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XPS study of MnO2 minerals treated by bioleaching

✍ Scribed by V. Di Castro; G. Polzonetti; G. Contini; C. Cozza; B. Paponetti

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
326 KB
Volume
16
Category
Article
ISSN
0142-2421

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✦ Synopsis

Abstract

XPS has been used to follow the change of the ore surface composition during bioleaching with a mixed culture of microorganisms. In the original sample, the presence of MnO~2~ together with silica and alumina is observed. During bioleaching, Mn(IV) is progressively reduced to Mn(II) and signals due to the presence of the microorganisms appear in the C 1s and N 1s spectra.

In the residual sample, a considerable amount of Mn associated with the cells of the microorganisms of reprecipitated in the from of the Mn(OH)~2~ is present on the surface of the ore. This Mn species can be removed completely by treatment with a dilute soultion of HCI.

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