Application of FT-IR spectroscopy for in situ studies of sphalerite with aqueous solutions of potassium ethylxanthate and with diethyldixanthogen

Termes, S. C.; Richardson, Patricia A.

doi:10.1016/0301-7516(86)90015-3

Cited by 19 publications

(2 citation statements)

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“…Likewise, the proposed mechanism may offer an explanation for the changes in copper uptake with electrochemical potential. [19][20][21][22][23] Furthermore, the proposed mechanism explains many of the experimental results reported in the literature. First, it explains the 1:1 exchange between zinc and copper, as shown by Finkelstein and Allison.…”

Section: Resultsmentioning

confidence: 97%

“…The doublet at 163.1 eV has a somewhat lower BE than that of elemental sulfur 19 but is characteristic of the sulfurs with formal charge of 0 in polysulfides. [20][21][22] Polysulfides have a chain structure, in which the sulfur atoms at both ends have the formal charge of -1, while those in the middle of the chain have the formal charge of 0. At least part of the intensity of the 162.1 eV doublet shown in Figure 3a may be attributed to the Sspecies of polysulfides.…”

Section: Resultsmentioning

confidence: 99%

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An XPS Study of Sphalerite Activation by Copper

1998

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X-ray photoelectron spectroscopy (XPS) was used to study the kinetics and mechanisms of sphalerite activation in a 10-4 M CuSO4 solution at pH 9.2. The activation was fast during the first 10 min, after which the rate decreased exponentially. The increase in the amount of copper ion uptake was accompanied by the displacement of zinc ions from the sphalerite surface, indicating that the mechanism of copper uptake is one of displacement rather than adsorption. The XPS data show that the kinetics of activation increased considerably in a deoxygenated CuSO4 solution. Both the conventional XPS and synchrotron radiation XPS (SR-XPS) analyses show that copper activation involves a mechanism in which Cu2+ ions are reduced to the Cu(I) state, while the sulfur in ZnS is oxidized. Activation in the absence of oxygen and at an open circuit results in the formation of a CuS-like product, while in an air-saturated solution copper polysulfides are formed. The latter mechanisms are supported by the appearance of two distinct S(2p) doublets representing S- and S0 species at higher binding energies. When copper-activated sphalerite was conditioned in an air-saturated solution of pH 9.2, the CuS-like activation product is oxidized in preference to unactivated ZnS. The oxidation resulted in a loss of copper from the sphalerite surface, which may be detrimental to flotation.

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Section: Resultsmentioning

confidence: 97%