caa a22 4500 477049230 CHVBK 20180405111337.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF00242041 doi (NATIONALLICENCE)springer-10.1007/BF00242041 Relaxation of the lead-deficient sulfide surface layer on oxidized galena [Elektronische Daten] [A. Buckley, R. Woods] The surface oxidation of galena in air and in aqueous media has been investigated using electron spectroscopy and linear potential sweep voltammetry to elucidate the incongruent oxidation indicated by previous X-ray photoelectron spectroscopic studies. It has been confirmed that the initial oxidation reaction involves the removal of lead atoms from the sulfide lattice to generate a metal-deficient surface layer. It has been shown that, when the mineral is removed from the oxidizing environment, the composition of this layer relaxes slowly back towards that of the bulk mineral as a result of lead atoms diffusing from the bulk to the surface to fill metal vacancies in the sulfide lattice. The relaxation accounts for the absence of a shifted component in sulfur electron spectra from galena exposed to air or basic solutions in equilibrium with air. Correlation of the potential dependence of self-induced flotation and the extent of surface sulfur excess determined electrochemically indicates that a metal-deficiency equivalent to about half a monolayer of excess sulfur is necessary for significant flotation to be effected. Chapman & Hall, 1996 Buckley A. CSIRO Division of Coal and Energy Technology, PO Box 136, 2113, North Ryde, NSW, Australia aut Woods R. CSIRO Division of Minerals, PO Box 124, 3207, Port Melbourne, Victoria, Australia aut Journal of Applied Electrochemistry Kluwer Academic Publishers 26/9(1996-09-01), 899-907 0021-891X 26:9<899 1996 26 10800 https://doi.org/10.1007/BF00242041 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00242041 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Buckley A. CSIRO Division of Coal and Energy Technology, PO Box 136, 2113, North Ryde, NSW, Australia aut NATIONALLICENCE 700 1- Woods R. CSIRO Division of Minerals, PO Box 124, 3207, Port Melbourne, Victoria, Australia aut NATIONALLICENCE 773 0- Journal of Applied Electrochemistry Kluwer Academic Publishers 26/9(1996-09-01), 899-907 0021-891X 26:9<899 1996 26 10800 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer