Galvanic contacting effect of pyrite on xanthate adsorption on galena surface: DFT simulation and cyclic voltammetric measurements
Baolin Ke 1
Jianhua Chen 2  
Yuqiong Li 2
More details
Hide details
Mining College of Guizhou University
Innovation Center for Metal Resources Utilization and Environment Protection of Guangxi University
School of Resources, Environment and Materials of Guangxi University
Jianhua Chen   

Innovation Center for Metal Resources Utilization and Environment Protection of Guangxi University, Guangxi University, Nanning 530004, P.R. China, 530004 Nanning, China
Physicochem. Probl. Miner. Process. 2018;54(3):826–836
The effect of galvanic interaction between pyrite and galena on xanthate adsorbing on the galena surface has been investigated by means of density functional theory (DFT) and cyclic voltammetric measurements. The calculated results show that differences in the contact site and contact distance between galena and pyrite can affect the intensity of the galvanic interaction, and the relationship between the intensity of galvanic interaction and the adsorption ability of xanthate on galena surface has been studied in detail. In general, the galvanic interaction between pyrite and galena surface can enhance the adsorption of xanthate on the galena surface. The adsorption energies of xanthate on the galena surface decrease with the decrease of contact distance, and when the contact distance is lower than 4 Å, the adsorption energies decrease significantly at Pb-Pb, Pb-S and S-S sites. In particular, at the contact distance of 3 Å, a sharp decrease of adsorption energy is observed at the Pb-Pb contact site; in this case, the negative shift of the Pb-S bonding range and DOS non-locality at Pb-Pb contact site are significantly greater than that of the S-S or Pb-S contact sites. The cyclic voltammetric measurements reveal that the galvanic interaction between galena and pyrite improves the adsorption of xanthate on galena surface, which is in good agreement with the DFT results.
IONESCU, A., ALLOUCHE, A., AYCARD J.P., RAJZMANN, M., GALL, R.L., 2003. Study of γ-Alumina-Supported Hydrotreating Catalyst:  I. Adsorption of Bare MoS2 Sheets on γ-Alumina Surfaces. J. Phys. Chem. B 107, 8490-8497.
CHEN, J., KE, B., LAN, L., LI, Y., 2015. Influence of Ag, Sb, Bi and Zn impurities on electrochemical and flotation behaviour of galena. Miner. Eng. 72, 10-16.
CHENG, X., IWASAKI, I., 1992. Effect of chalcopyrite and pyrrhotite interaction on flotation separation. Miner. Metall. Proc. 9, 73-79.
CHMIELEWSKI, T., KALETA, R., 2011. Galvanic Interactions of Sulfide Minerals in Leaching of Flotation Concentrate from Lubin Concentrator. Physicochem. Probl. M. 21-34.
EKMEKÇI, Z., DEMIREL, H., 1997. Effects of galvanic interaction on collectorless flotation behaviour of chalcopyrite and pyrite. International Journal of Mineral Processing 52, 31-48.
HEIDMANN, I., CALMANO, W., 2010. Removal of Ni, Cu and Cr from a galvanic wastewater in an electrocoagulation system with Fe- and Al-electrodes. Sep Purif Technol 71, 308-314.
HERBERT, F.W., KRISHNAMOORTHY, A., MA, W., VLIET, K.J.V., YILDIZ, B., 2014. Dynamics of point defect formation, clustering and pit initiation on the pyrite surface. Electrochim Acta 127, 416-426.
KE, B., LI, Y., CHEN, J., ZHAO, C., CHEN, Y., 2016. DFT study on the galvanic interaction between pyrite (100) and galena (100) surfaces. Applied Surface Science 367, 270-276.
LAN, L., 2012. The effect of lattice defect of galena on the surface property, molecular absorption of flotation reagents and electrochemical behavior. Guangxi university.
LI, J., CROISET, E., RICARDEZSANDOVAL, L., 2013. Effect of Metal–Support Interface During CH4 and H2 Dissociation on Ni/γ-Al2O3: A Density Functional Theory Study. J. Phys. Chem. C, 117, 16907-16920.
LI, Y., CHEN, J., CHEN, Y., ZHAO, C., ZHANG, Y., KE, B., 2018. Interactions of Oxygen and Water Molecules with Pyrite Surface: A New Insight. Langmuir 34, 1941-1952.
LIU, Q.Y., HE-PING, L.I., ZHOU, L., 2007. The Study on the Galvanic Effect of Sulphide Minerals:A Review. Bulletin of Mineralogy Petrology & Geochemistry 26, 284-289.
LIU, Q.Y., LI, H.P., ZHOU, L., 2009. Experimental study of pyrite-galena mixed potential in a flowing system and its applied implications. Hydrometallurgy 96, 132-139.
MONKHORST, HENDRIK, J., JAMES, D., 1976. Special points for Brillouin-zone integrations. Physical Review B 13, 5188--5192.
MOSLEMI, H., SHAMSI, P., HABASHI, F., 2011. Pyrite and pyrrhotite open circuit potentials study: Effects on flotation. Miner Eng 24, 1038-1045.
NOOSHABADI, A.J., RAO, K.H., 2014. Formation of hydrogen peroxide by sulphide minerals. Hydrometallurgy 141, 82-88.
PERDEW, J.P., CHEVARY, J.A., VOSKO, S.H., JACKSON, K.A., PEDERSON, M.R., SINGH, D.J., FIOLHAIS, C., 1992. Atoms, molecules, solids, and surfaces: Applications of the generalized gradient approximation for exchange and correlation. Physical Review B Condensed Matter 46, 6671-6687.
QIN, W.Q., WANG, X.J., LI-YUAN, M.A., JIAO, F., LIU, R.Z., GAO, K., 2015. Effects of galvanic interaction between galena and pyrite on their flotation in the presence of butyl xanthate. T. Nonferr. Metal Soc. 25, 3111-3118.
RAO S R, F.J.A., 1988. Galvanic Interaction Studies on Sulphide Minerals. Canadian Metallurgical Quarterly 4, 253-259.
ROSCIONI, O.M., DYKE, J.M., EVANS, J., 2013. Structural Characterization of Supported RhI(CO)2/γ-Al2O3 Catalysts by Periodic DFT Calculations. Journal of Physical Chemistry C 117, 19464-19470.
SADEGHIAMIRSHAHIDI, M., KISH, T.E., ARDEJANI, F.D., 2013. Application of Image Processing for Modelling Pyrite Oxidation in a Coal Washing Waste Pile. Environ Model Assess 18, 365-376.
SHANG, C., LIU, Z.P., 2010. Is Transition Metal Oxide a Must? Moisture-Assisted Oxygen Activation in CO Oxidation on Gold/γ-Alumina†. J. Phys. Chem. C, 16989-16995.
SILVA, G.D., LASTRA, M.R., BUDDEN, J.R., 2003. Electrochemical passivation of sphalerite during bacterial oxidation in the presence of galena. Miner. Eng. 16, 199-203.
VANDERBILT, D., 1990. Soft self-consistent pseudopotentials in a generalized eigenvalue formalism. Physical Review B Condensed Matter 41, 7892-7895.
ZHANG, R., LIU, H., WANG, B., LING, L., 2012. Insights into the effect of surface hydroxyls on CO2 hydrogenation over Pd/γ-Al2O3 catalyst: A computational study. Applied Catalysis B Environmental 126, 108–120.