Surface chemical characterization of different pyrite size fractions for flotation purposes

Derycke, Virginie; Kongolo, M.; Benzaazoua, Mostafa; Mallet, Martine; Barrès, Odile; Donato, Philippe de; Bussière, Bruno; Mermillod-Blondin, Raphaël

doi:10.1016/j.minpro.2012.10.004

Cited by 59 publications

(14 citation statements)

References 70 publications

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“…The infrared spectra of kerosene adsorbed on the surface of molybdenite before and after magnetization are shown in Figure 10. There were the characteristic absorption peaks at 3435 and 1625 cm −1 in molybdenite before the action of the collector, which were mainly caused by the stretching vibrations of -OH and the adsorbed water, consistent with the research of Derycke et al [29]. The characteristic absorption peak of sulfate located at 1100 cm −1 was caused by the oxidation of molybdenite.…”

Section: Ftir Characterization Of Molybdenite Before and After Magnetization Of Kerosenesupporting

confidence: 89%

Influence Mechanism of Magnetized Modified Kerosene on Flotation Behavior of Molybdenite

Xiao

Jin

et al. 2021

Minerals

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The effects and mechanism of magnetized kerosene on the flotation behaviors of molybdenite were studied by micro-flotation, ultraviolet spectrum, infrared spectrum, surface tension, and liquid viscosity. According to the results of micro-flotation, magnetized kerosene improved the flotation recovery of molybdenite, and the improvements were more obvious with smaller molybdenite particles. Spectral analysis showed that the magnetization did not change the chemical composition of kerosene, but transformed the linear aliphatic hydrocarbons in kerosene into linear isomers and reduced the lengths of the carbon chains. Moreover, the magnetization reduced the viscosity of kerosene and oil/water interfacial tension, and improved the dispersion of kerosene in the pulp. The external magnetic field transformed the disorder of the additional magnetic moment in the kerosene molecules into order, and reduced the compactness of the kerosene molecules. The experimental results provided a theoretical explanation for the role of magnetization in mineral flotation.

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Section: Ftir Characterization Of Molybdenite Before and After Magnetization Of Kerosenesupporting

confidence: 89%

Influence Mechanism of Magnetized Modified Kerosene on Flotation Behavior of Molybdenite

Xiao

Jin

et al. 2021

Minerals

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“…Nevertheless, since pure components also present these vibrations, the possible existence of metallic amides vibrations assignation are relatively smaller. As presented in the work of Derycke et al (2013), vibrations in the range of 3550 cm À1 and 3405 cm À1 could come from lattice water or other hydroxyl groups. These vibrations are considerable removed from after treatment which could imply a considerable removal of hydroxyl groups from lattice structures or hydrated species.…”

Section: Fourier Transform Infrared Spectroscopy (Ftir) Analysesmentioning

confidence: 80%

“…8-10, between 1250 cm À1 and 900 cm À1 there is a considerable concentration of signals related to sulfates which could come from hydroxyl ferric sulfate, ferric sulfate, hydrated ferric sulfate, ferrous sulfate, ferric sulfate clusters, hydrated ferrous sulfate, and hydrated ferrous sulfates for minerals containing iron ions (Derycke et al, 2013); sulfates with copper ions also produce vibrations in the similar range and given the relatively small differences in electronegativity, vibrations could overlap with those from sulfates with iron ions, especially with those with the same oxidation state.…”

Section: Fourier Transform Infrared Spectroscopy (Ftir) Analysesmentioning

confidence: 99%

Adsorption of biosolids and their main components on chalcopyrite, molybdenite and pyrite: Zeta potential and FTIR spectroscopy studies

Reyes-Bozo

Escudey

Vyhmeister

et al. 2015

Minerals Engineering

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“…The presence of less-abundant minerals such as covellite and sphalerite was also confirmed by PM and XPS (Supplementary Materials, Figure S1). For XPS measurements, the assignment of species from Fe, S and Pb is shown in Table 1, together with selected information available from the literature [10,[15][16][17][18]. To show the reliability of the XPS signal assignments, the calibration standards are listed in the table as well for all the references cited.…”

Section: Resultsmentioning

confidence: 99%

“…Even though this strategy provides important information regarding surface processes, many processes occur only when one mineral is in the presence of another. One of the best known examples of this is the formation of galvanic pairs, where a stable mineral (such as pyrite) can promote the dissolution of a more reactive mineral (such as sphalerite) [9,10]. Another example is the formation of passivating layers that can hinder the metal extraction by blocking the surface.…”

Section: Introductionmentioning

confidence: 99%

Identification of Surface Processes in Individual Minerals of a Complex Ore through the Analysis of Polished Sections Using Polarization Microscopy and X-ray Photoelectron Spectroscopy (XPS)

Silva-Quinones

Jacome-Collazos

et al. 2018

Minerals

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Understanding the changes of a mineral during ore processing is of capital importance for the development of strategies aimed at increasing the efficiency of metal extraction. This task is often difficult due to the variability of the ore in terms of composition, mineralogy and texture. In particular, surface processes such as metal re-adsorption (preg-robbing) on specific minerals are difficult to evaluate, even though they may be of importance as the re-adsorbed material can be blocking the valuable mineral and negatively affect the extraction process. Here, we show a simple yet powerful approach, through which surface processes in individual minerals are identified by combining polarization microscopy (MP) and X-ray photoelectron spectroscopy (XPS). Taking as an example a silver-containing polymetallic sulfide ore from the Peruvian central Andes (pyrite-based with small amounts of galena), we track the changes in the sample during the course of cyanidation. While polarization microscopy is instrumental for identifying mineralogical species, XPS provides evidence of the re-adsorption of lead on a pyrite surface, possibly as lead oxide/hydroxide. The surface of pyrite does not show significant changes after the leaching process according to the microscopic results, although forms of oxidized iron are detected together with the re-adsorption of lead by XPS. Galena, embedded in pyrite, dissolves during cyanide leaching, as evidenced by PM and by the decrease of XPS signals at the positions associated with sulfide and sulfate. At the same time, the rise of a lead peak at a different position confirms that the re-adsorbed lead species cannot be sulfides or sulfates. Interestingly, lead is not detected on covellite surfaces during leaching, which shows that lead re-adsorption is a process that depends on the nature of the mineral. The methodology shown here is a tool of significant importance for understanding complex surface processes affecting various minerals during metal extraction.

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Surface chemical characterization of different pyrite size fractions for flotation purposes

Cited by 59 publications

References 70 publications

Influence Mechanism of Magnetized Modified Kerosene on Flotation Behavior of Molybdenite

Influence Mechanism of Magnetized Modified Kerosene on Flotation Behavior of Molybdenite

Adsorption of biosolids and their main components on chalcopyrite, molybdenite and pyrite: Zeta potential and FTIR spectroscopy studies

Identification of Surface Processes in Individual Minerals of a Complex Ore through the Analysis of Polished Sections Using Polarization Microscopy and X-ray Photoelectron Spectroscopy (XPS)

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