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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.