Interaction of thiol collectors with pre-oxidised sulfide minerals

The oxidation states of copper and iron in mineral sulfides, and the oxides formed on initial exposure of chalcopyrite and bornite to air

“…Rather, it resembled the spectrum for basic copper carbonate (azurite) reported by Todd and Sherman (2003). It was also similar to the spectrum for copper sulfate (Todd and Sherman, 2003;Todd et al, 2003b), but sulfate at the surface of chalcocite exposed to air for up to 24 h had not been detected by XPS (Buckley et al, 2003). Neither of these O K-edge spectra displayed a peak near 530 eV.…”

Coupled thermal, hydraulic and geochemical evolution of pyritic tailings in unsaturated column experiments

“…d Tosca et al (2005). (Buckley et al, 2003), as well as in other metallogenic provinces in the world Hammarstrom et al, 2005). The observed reduction in the hydration degree of iron sulfate salts from rozenite and melanterite to szomolnokite with time is consistent with the increase of temperature at the top surface of the column and with a reduction in the water activity owing to increasing concentrations and acidity in the pore-water although some dehydration prior to XRD determinations cannot be ruled out.…”

The Effect of Chloride Ions on the Activity of Cerussite Surfaces

“…The C 1s spectrum presented three well-separated XPS peaks positioned at 284.80, 286.30, and 289.28 eV (see Figure 3a). Combined with previous research [26][27][28], for C 1s spectrum, the chemical state at 284.80 and 286.30 eV XPS peaks were attributed to the contaminated carbon (i.e., hydrocarbon and carbon-oxygen species), and the other XPS peak at 289.28 eV was assigned to the carbon in the carbonate group. The two XPS peaks at 531.42 and 533.16 eV fit the O ls spectrum (see Figure 4a), which were assigned to the oxygen in the carbonate group and contaminated carbon-oxygen species on the cerussite surface treated without chloride ions.…”