TY - JOUR
T1 - Physical-chemical study of IPETC and PAX collector's adsorption on covellite surface
AU - Botero, Yesica L.
AU - Canales-Mahuzier, Andrés
AU - Serna-Guerrero, Rodrigo
AU - López-Valdivieso, Alejandro
AU - Benzaazoua, Mostafa
AU - Cisternas, Luis A.
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/11/15
Y1 - 2022/11/15
N2 - The adsorption mechanisms of the collectors O-isopropyl-N-ethyl thionocarbamate (IPETC) and potassium amyl xanthate (PAX) on a covellite surface were studied through microflotation tests, Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculations. The microflotation test demonstrated that the collectors have a marked effect on the covellite flotation and that covellite flotation is not pH-dependent. The FT-IR spectra for covellite treated with IPETC and PAX collectors at pH 8 and 11 does not differ significantly. For IPETC, the leading adsorption –C(=S) –NH group vibration was identified, and the NH stretching band is absent from both spectra. The spectra show the frequencies for the PAX, Cu-amylxanthate (CuAX), and (AX)2 dixantogen that formed. The XPS spectra showed that the adsorption mechanism of PAX on the covellite surface is principally through C 1 s and S 2p. The adsorption mechanism of IPETC on the covellite surface suggests that the bond is enabled through the[dbnd]S element of the collector with Cu atoms in the covellite surface. Finally, the DFT calculations predict that for IPETC the bond with copper only occurred through the C[dbnd]S group. For PAX, the bond with copper occurred through the C[dbnd]S and C–S groups.
AB - The adsorption mechanisms of the collectors O-isopropyl-N-ethyl thionocarbamate (IPETC) and potassium amyl xanthate (PAX) on a covellite surface were studied through microflotation tests, Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculations. The microflotation test demonstrated that the collectors have a marked effect on the covellite flotation and that covellite flotation is not pH-dependent. The FT-IR spectra for covellite treated with IPETC and PAX collectors at pH 8 and 11 does not differ significantly. For IPETC, the leading adsorption –C(=S) –NH group vibration was identified, and the NH stretching band is absent from both spectra. The spectra show the frequencies for the PAX, Cu-amylxanthate (CuAX), and (AX)2 dixantogen that formed. The XPS spectra showed that the adsorption mechanism of PAX on the covellite surface is principally through C 1 s and S 2p. The adsorption mechanism of IPETC on the covellite surface suggests that the bond is enabled through the[dbnd]S element of the collector with Cu atoms in the covellite surface. Finally, the DFT calculations predict that for IPETC the bond with copper only occurred through the C[dbnd]S group. For PAX, the bond with copper occurred through the C[dbnd]S and C–S groups.
KW - Amyl xanthate
KW - Collector adsorption
KW - Covellite
KW - Density functional theory
KW - Thionocarbamate
UR - http://www.scopus.com/inward/record.url?scp=85134894632&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2022.154232
DO - 10.1016/j.apsusc.2022.154232
M3 - Article
AN - SCOPUS:85134894632
SN - 0169-4332
VL - 602
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 154232
ER -