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Minerals 2018, 8(3), 118; https://doi.org/10.3390/min8030118

Near-Field Optical Examination of Potassium n-Butyl Xanthate/Chalcopyrite Flotation Products

1
Helmholtz-Zentrum Dresden-Rossendorf, Helmholtz Institute Freiberg for Resource Technology, Chemnitzer Str. 40, 09599 Freiberg, Germany
2
Institute of Applied Physics, University of Technology Dresden, 01062 Dresden, Germany
3
Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany
4
Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany
5
Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany
6
Center for Advancing Electronics Dresden (CFAED), University of Technology Dresden, 01062 Dresden, Germany
*
Author to whom correspondence should be addressed.
Received: 9 February 2018 / Revised: 14 March 2018 / Accepted: 15 March 2018 / Published: 19 March 2018
(This article belongs to the Special Issue Applications of Atomic Force Microscopy in Mineral Flotation)
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Abstract

The present study introduces scattering-type scanning near-field infrared optical nanospectroscopy (s-SNIM) as a valuable and well-suited tool for spectrally fingerprinting n-butyl xanthate (KBX) molecules adsorbed to chalcopyrite (CCP) sample surfaces. The collector KBX is well known to float CCP and is used in beneficiation. We thus identified KBX reaction products both by IR optical far- and near-field techniques, applying attenuated total internal reflection Fourier-transform infrared spectroscopy (ATR FT-IR) in comparison to s-SNIM, respectively. The major KBX band around 880 cm−1 was probed in s-SNIM using both the tunable free-electron laser FELBE at the Helmholtz-Zentrum Dresden-Rossendorf facility, Germany, and table-top CO2 laser illumination. We then were able to monitor the KBX agglomeration in patches <500 nm in diameter at the CCP surface, as well as nanospectroscopically identify the presence of KBX reaction products down to the 10−4 M concentration. View Full-Text
Keywords: potassium n-butyl xanthate; chalcopyrite; flotation; near-field nanoscopy; IR spectroscopy; scanning probe microscopy; fingerprint region; ultra-low concentration potassium n-butyl xanthate; chalcopyrite; flotation; near-field nanoscopy; IR spectroscopy; scanning probe microscopy; fingerprint region; ultra-low concentration
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Firkala, T.; Kuschewski, F.; Nörenberg, T.; Klopf, J.M.; Pashkin, A.; Foerstendorf, H.; Rudolph, M.; Kehr, S.C.; Eng, L.M. Near-Field Optical Examination of Potassium n-Butyl Xanthate/Chalcopyrite Flotation Products. Minerals 2018, 8, 118.

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