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Flotation separation of molybdenite from chalcopyrite using an environmentally-efficient depressant L-cysteine and its adsoption mechanism

Zhigang Yin, Shengda Chen

2020enflotationmolybdenitechalcopyritedepressantl-cysteine

Abstract

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In this work, L-cysteine was introduced as an environmentally-efficient flotation reagent in the selective separation of molybdenite from chalcopyrite. Its flotation performance and adsorption mechanism onto chalcopyrite were also investigated by flotation experiment, zeta potential, FTIR spectra, Raman spectra, TOF-SIMS measurements and DFT calculations. The flotation results indicated that L-cysteine exhibited stronger depressing ability than the conventional chalcopyrite depressants of Na2S, NaHS and sodium thioglycolate, suggesting it could become a promising potential depressant in the selective flotation separation of molybdenite from chalcopyrite. The results of zeta potential, FTIR spectra, TOF-SIMS and Raman spectra measurements demonstrated that L-cysteine might chemisorb on the Cu atoms of chalcopyrite surface via -SH and –NH2 groups to form a stable L-cysteine-Cu chelate compound. The DFT calculations further supported the experimental characterizations; the calculated adsorption reaction energy of L-cysteine with Cu in the (0 0 1) surface of chalcopyrite was much lower than that of L-cysteine with Fe, which implied that L-cysteine would prefer to adsorb onto the Cu site of chalcopyrite surface.

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Cite This Work

@article{5a4ea317-8104-4910-8839-58439bc3c4ff,
  title={Flotation separation of molybdenite from chalcopyrite using an environmentally-efficient depressant L-cysteine and its adsoption mechanism},
  author={Zhigang Yin and Shengda Chen},
  year={2020},
  language={en}
}
TY  - JOUR
TI  - Flotation separation of molybdenite from chalcopyrite using an environmentally-efficient depressant L-cysteine and its adsoption mechanism
AU  - Zhigang Yin
AU  - Shengda Chen
PY  - 2020
LA  - en
ER  -

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