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- W4309152425 endingPage "1444" @default.
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- W4309152425 abstract "During grinding with forged steel media, sulphides such as pyrite undergo surface changes due to the occurrence of oxidation–reduction reactions, which affect its depression during the concentration process. For this reason, in this work, the surface modification of pyrite during grinding was studied; FTIR, ICP-OES, XRD and SEM-EDS were used for the materials’ characterisation. It was found that the pyrite obtained during grinding showed magnetic susceptibility due to the absorption and superficial formation of magnetite Fe3O4, Fe–O bonds identified by FTIR at 598 cm−1, and of other species, such as oxy-hydroxy-sulphates at 696 cm−1 and goethite α-FeOOH at 875 cm−1. This caused the reversal of the zeta potential magnitude (ζ) from positive to negative at pH 8.3 and 30 min of grinding. The ζ of the pyrite throughout the studied pH ranges was, overall, positive, i.e., +5 mV. However, at pH 10.5 and 15 min of grinding, the ζ turned negative. This was associated with the formation of Fe–CO3 (−2) bonds in the siderite, which were identified with the absorption bands corresponding to 756, 1448 and 1493 cm−1." @default.
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- W4309152425 date "2022-11-15" @default.
- W4309152425 modified "2023-10-16" @default.
- W4309152425 title "Surface Spectroscopy of Pyrite Obtained during Grinding and Its Magnetisation" @default.
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- W4309152425 doi "https://doi.org/10.3390/min12111444" @default.
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