XPS study of MnO 2  minerals treated by bioleaching | Zendy

Di Castro V. | Zendy; Polzonetti G. | Zendy; Contini G. | Zendy; Cozza C. | Zendy; Paponetti B. | Zendy

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XPS study of MnO 2 minerals treated by bioleaching

Author(s) -

Di Castro V.,

Polzonetti G.,

Contini G.,

Cozza C.,

Paponetti B.

Publication year - 1990

Publication title -

surface and interface analysis

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.52

H-Index - 90

eISSN - 1096-9918

pISSN - 0142-2421

DOI - 10.1002/sia.7401601120

Subject(s) - bioleaching , x ray photoelectron spectroscopy , metallurgy , mineral , microorganism , chemistry , chemical composition , mineralogy , materials science , chemical engineering , geology , bacteria , copper , paleontology , organic chemistry , engineering

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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