TY - GEN
T1 - Surface characterization of xanthate adsorption on molybdenite
AU - Zhang, J.
AU - Wiyono, S.
AU - Lee, P.
AU - Xiao, W.
PY - 2009
Y1 - 2009
N2 - Surface characterization techniques, i.e. contact angle measurement, atomic force microscopy (AFM) surface force and surface imaging measurement, were applied to investigate the molybdenite surface in aqueous solution. It was shown that the cleaved basal surface of molybdenite was very hydrophobic with a 92 degree water contact angle. The non-polar component of the solid surface free energy is 50.52 mJ/m2 while the polar components are almost zero. The solid surface was not reactive and was only weakly charged at the pH 6. When the aqueous media changes from water to 1×10-4 M KEX solution, the measured contact angle, adhesion force and surface roughness all increase slightly. However, ethanol rinsing made the surface change back to the bare substrate. It was suggested that the hydrophobic chemical, i.e. dixanthogen, which was shown in the morphology of patches by the AFM image, physically adsorbed on the hydrophobic molybdenite surface through the hydrophobic interaction.
AB - Surface characterization techniques, i.e. contact angle measurement, atomic force microscopy (AFM) surface force and surface imaging measurement, were applied to investigate the molybdenite surface in aqueous solution. It was shown that the cleaved basal surface of molybdenite was very hydrophobic with a 92 degree water contact angle. The non-polar component of the solid surface free energy is 50.52 mJ/m2 while the polar components are almost zero. The solid surface was not reactive and was only weakly charged at the pH 6. When the aqueous media changes from water to 1×10-4 M KEX solution, the measured contact angle, adhesion force and surface roughness all increase slightly. However, ethanol rinsing made the surface change back to the bare substrate. It was suggested that the hydrophobic chemical, i.e. dixanthogen, which was shown in the morphology of patches by the AFM image, physically adsorbed on the hydrophobic molybdenite surface through the hydrophobic interaction.
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M3 - Conference contribution
AN - SCOPUS:70450214430
SN - 9781615671533
T3 - SME Annual Meeting and Exhibit and CMA's 111th National Western Mining Conference 2009
SP - 485
EP - 490
BT - SME Annual Meeting and Exhibit and CMA's 111th National Western Mining Conference 2009
T2 - SME Annual Meeting and Exhibit and CMA's 111th National Western Mining Conference 2009
Y2 - 22 February 2009 through 25 February 2009
ER -