Infrared investigation of amylxanthate Adsorption on galena: Influence of oxidation, pH and grinding

Donato, P. De; Cases, J. M.; Kongolo, M.; Michot, Laurent J.; Burneau, A.

doi:10.1016/0166-6622(90)80197-c

Cited by 29 publications

(13 citation statements)

References 9 publications

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“…8). The sulphate and carbonate bands intensities are low at pH 3, increased at pH 7 and pH 10.5 in deionised water whereas in process water only at pH 10.5, high intensity lead carbonate bands (680, 838, 1425 cm À1 ) and calcium carbonate band (875 cm À1 ) are observed besides lead sulphate bands (1050, 1159 cm À1 ) (Cases and De Donato, 1991;De Donato et al, 1990;Leppinen, 1990).…”

Section: Diffuse Reflectance Ftir Spectroscopy Studiesmentioning

confidence: 89%

Recycling of process water in sulphide flotation: Effect of calcium and sulphate ions on flotation of galena

Ikumapayi

Mäkitalo

Johansson

et al. 2012

Minerals Engineering

142

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a b s t r a c tThe effects of major components of calcium and sulphate species present in recycled process water on galena flotation has been investigated through Hallimond flotation, zeta-potential, diffuse reflectance FTIR spectroscopy and XPS measurements using pure galena mineral. The significance of process water species in flotation has been understood using deionised water, process water and simulated tap water containing equivalent calcium and sulphate ions concentration as in process water.Hallimond flotation indicated marginally lower recoveries of galena in the presence of calcium and sulphate ions using potassium amyl xanthate as collector. Zeta-potential shows the adsorption of calcium ions whereby the potential are seen to increase while sulphate ions have no significant effect. FTIR and XPS studies revealed surface calcium carbonate and/or calcium sulphate species in process water which affected xanthate adsorption. Presence of surface oxidised species such as sulfoxy, hydroxyl species on galena at pH 10.5 in deionised and process water was also revealed.

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Section: Diffuse Reflectance Ftir Spectroscopy Studiesmentioning

confidence: 89%

Recycling of process water in sulphide flotation: Effect of calcium and sulphate ions on flotation of galena

Ikumapayi

Mäkitalo

Johansson

et al. 2012

Minerals Engineering

142

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“…Diffuse reflectance spectra of the mineral surface were recorded on a Fourier Transform Infrared Spectrophotometer (Bruker IFS 88) equipped with a mercury-cadmiumtelluride detector in association with a diffuse reflectance attachment (Harrick Corp.). This device allowed the inves- tigation of mineral surfaces and the organic species adsorbed on them (9,25).…”

Section: Materuils and Methodsmentioning

confidence: 99%

Corrosion and Electrochemical Oxidation of a Pyrite by Thiobacillus ferrooxidans

Mustin

Berthelin

Marion

et al. 1992

Appl Environ Microbiol

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The oxidation of a pure pyrite by Thiobacillus ferrooxidans is not really a constant phenomenon; it must be considered to be more like a succession of different steps which need characterization. Electrochemical studies using a combination of a platinum electrode and a specific pyrite electrode (packed-ground-pyrite electrode) revealed four steps in the bioleaching process. Each step can be identified by the electrochemical behavior (redox potentials) of pyrite, which in turn can be related to chemical (leachate content), bacterial (growth), and physical (corrosion patterns) parameters of the leaching process. A comparison of the oxidation rates of iron and sulfur indicated the nonstoichiometric bacterial oxidation of a pure pyrite in which superficial phenomena, aqueous oxidation, and deep crystal dissolution are successively involved.

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“…It is worth noting that depending on their source, some pyrites could present at their surface a quite large enrichment in polysulfides, whereas the surface of some other samples is almost free of sulfur (15). A lot of methods such as electrochemistry (16), X-ray photoelectron spectroscopy (XPS) (17,18), infrared and Raman spectroscopies (19,20), electrophoretic mobility measurements (21,22), and scanning tunneling microscopy (6) have been used. A lot of methods such as electrochemistry (16), X-ray photoelectron spectroscopy (XPS) (17,18), infrared and Raman spectroscopies (19,20), electrophoretic mobility measurements (21,22), and scanning tunneling microscopy (6) have been used.…”

Section: Introductionmentioning

confidence: 99%

“…This large diversity of behavior is certainly at the origin of some of the discrepancies found in the literature when looking at the surface characterization of pyrite. Formation of elemental sulfur or polysulfides and the nature of intermediate and final products of oxidation are some of the questions which stimulate new experiments (18)(19)(20). Many questions are still the subject of debate.…”

Section: Introductionmentioning

confidence: 99%

Surface Oxidation of Pyrite as a Function of pH

Bonnissel-Gissinger

Alnot

Ehrhardt

et al. 1998

Environ. Sci. Technol.

283

150

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Pyrite, the most abundant metal sulfide at the surface of Earth, plays a key role in many processes such as acid mine drainage, redox cycling of metals at oxic-anoxic boundaries of lake bottom, and degradation of pollutants. The oxidation of pyrite was studied in batch experiments over a large range of pH (2.5-12), with trace oxygen. Surface analysis of the samples was performed using X-ray photoelectron spectroscopy (XPS). Speciation of the aqueous species was investigated by inductively coupled plasma atomic emission spectrometry (ICP-AES), ionic chromatography, and UV-vis spectrophotometry. The pyrite surface can drastically change with the pH, which was never at steady state and tended to reach an acidic value whatever the initial pH. For pH <4, Fe(II) and SO 4 2were released into solution; from XPS analyses, the pyrite surface presented O-H groups, an Fe-deficient composition Fe 1-x S 2 , and iron(III) (hydr)oxide traces. Whatever the pH, the sulfur of the FeS 2 surface was mainly under the (-I) state oxidation. When the pH increased, Fe(II) disappeared and the surface was covered with iron(III) (hydr)oxides. This overlayer did not passivate the sample against further oxidation, and a decrease in pH was still observed.

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Infrared investigation of amylxanthate Adsorption on galena: Influence of oxidation, pH and grinding

Cited by 29 publications

References 9 publications

Recycling of process water in sulphide flotation: Effect of calcium and sulphate ions on flotation of galena

Recycling of process water in sulphide flotation: Effect of calcium and sulphate ions on flotation of galena

Corrosion and Electrochemical Oxidation of a Pyrite by Thiobacillus ferrooxidans

Surface Oxidation of Pyrite as a Function of pH

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