Scanning photoelectron microscopy studies of freshly fractured chalcopyrite exposed to O2 and H2O

Li, Y.; Chandra, Anand P.; Gerson, Andrea R.

doi:10.1016/j.gca.2014.02.037

Cited by 42 publications

(33 citation statements)

References 58 publications

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“…Fe 2p Spectra Figure 13 shows the Fe 2p XPS spectra of chalcopyrite treated under different conditions. The strong peaks locating at 708~710 eV and 711~715 eV were assigned to Fe from chalcopyrite and Fe-O/OH/SO species, respectively [46,50,51,58], with the latter being possible from hydrated Fe 2 O 3 , Fe(OH) 3 , FeOOH and/or Fe 2 (SO 4 ) 3 formed during the processes of grinding, sieving and flotation, consistent with some other published work [58][59][60]. …”

Section: S 2p Spectrasupporting

confidence: 88%

“…In other words, SHMP reduced the formation and adsorption of Mg(OH) 2 on chalcopyrite, thereby improving chalcopyrite recovery. Figure 10 shows five S species including monosulfide (S 2− ), disulfide (S 2 2− ), polysulfide (S n 2− ), sulfate (SO 4 2− ) and an energy loss feature (S 3p → Fe 3d) located at 161.3 eV, 162.0 eV, 162.8 eV, 169.1eV and 164.9 eV, respectively [38,[46][47][48][49].…”

Section: Survey Spectramentioning

confidence: 99%

“…Noted: All BE with a typical variation of ± 0.1 eV. [38,46,48,50,51]. It should be noted that the hydroxide and sulfate were fitted at 531.3 ± 0.1 eV due to overlapping of the binding energy of these two O species [52].…”

Section: S 2p Spectramentioning

confidence: 99%

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The Influencing Mechanisms of Sodium Hexametaphosphate on Chalcopyrite Flotation in the Presence of MgCl2 and CaCl2

Xiao

et al. 2018

Minerals

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Sea water has been used in flotation plants, showing a promising way to save fresh water usage. Previous studies indicated that divalent salts in sea water played negative roles in chalcopyrite flotation, but not much work have been conducted to understand the eliminating mechanisms. This study systematically investigated the effects of divalent cations of Ca 2+ and Mg 2+ on natural flotability of chalcopyrite in the absence of collectors and frothers. The reduced recovery was mainly due to the adsorption of Mg and Ca hydroxyl complexes and precipitation on chalcopyrite surfaces, giving rise to a less hydrophobic surface. The addition of sodium hexametaphosphate (SHMP), however, significantly improved chalcopyrite recovery. Species calculation, contact angle, zeta potential, FTIR and XPS analyses were conducted to understand the influencing mechanisms of divalent ions and the beneficial effects of SHMP on chalcopyrite recovery. The primary mechanism was that SHMP prevented the adsorption of positively charged Mg and Ca compounds or precipitation with hydrophilic properties such as Mg(OH) 2 on chalcopyrite surfaces, confirmed by the Derjguin-Landau-Verwey-Overbeek (DLVO) theory. Secondly, SHMP reacted with Mg 2+ and Ca 2+ to form dissolvable complexes, thereby declining the formation of insoluble Mg 2+ and Ca 2+ compounds or precipitation.

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Section: S 2p Spectrasupporting

confidence: 88%

Section: Survey Spectramentioning

confidence: 99%

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The Influencing Mechanisms of Sodium Hexametaphosphate on Chalcopyrite Flotation in the Presence of MgCl2 and CaCl2

Xiao

et al. 2018

Minerals

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“…This is consistent with the ICP-AES measurement (Table 1) suggesting a stoichiometry of 95.9 wt. % Cu0.96Fe0.99S2.00 [24]. A stoichiometry for the pyrite samples of 94.3 wt.…”

Section: Mineral Characterisationmentioning

confidence: 99%

“…If this is the case so the absolute concentrations of the oxidised S species may also be smaller. [24,26].…”

Section: Xps Analysesmentioning

confidence: 99%

Chalcopyrite Dissolution at 650 mV and 750 mV in the Presence of Pyrite

Qian

et al. 2015

Metals

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Abstract:The dissolution of chalcopyrite in association with pyrite in mine waste results in the severe environmental issue of acid and metalliferous drainage (AMD). To better understand chalcopyrite dissolution, and the impact of chalcopyrite's galvanic interaction with pyrite, chalcopyrite dissolution has been examined at 75 °C, pH 1.0, in the presence of quartz (as an inert mineral) and pyrite. The presence of pyrite increased the chalcopyrite dissolution rate by more than five times at Eh of 650 mV (SHE) (Cu recovery 2.5 cf. 12% over 132 days) due to galvanic interaction between chalcopyrite and pyrite. Dissolution of Cu and Fe was stoichiometric and no pyrite dissolved. Although the chalcopyrite dissolution rate at 750 mV (SHE) was approximately four-fold greater (Cu recovery of 45% within 132 days) as compared to at 650 mV in the presence of pyrite, the galvanic interaction between chalcopyrite and pyrite was negligible. Approximately all of the sulfur from the leached chalcopyrite was converted to S 0 at 750 mV, regardless of the presence of pyrite.At this Eh approximately 60% of the sulfur associated with pyrite dissolution was oxidised to S 0 and the remaining 40% was released in soluble forms, e.g., SO42− . OPEN ACCESSMetals 2015, 5 1567

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Bioleaching of two different genetic types of chalcopyrite and their comparative mineralogical assessment

Deng

et al. 2017

Anal Bioanal Chem

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The bioleaching of two different genetic types of chalcopyrite by the moderate thermophile Sulfobacillus thermosulfidooxidans was investigated by leaching behaviors elucidation and their comparative mineralogical assessment. The leaching experiment showed that the skarn-type chalcopyrite (STC) revealed a much faster leaching rate with 33.34% copper extracted finally, while only 23.53% copper was bioleached for the porphyry-type chalcopyrite (PTC). The mineralogical properties were analyzed by XRD, SEM, XPS, and Fermi energy calculation. XRD indicated that the unit cell volume of STC was a little larger than that of PTC. SEM indicated that the surface of STC had more steps and ridges. XPS spectra showed that Cu(I) was the dominant species of copper on the surfaces of the two chalcopyrite samples, and STC had much more copper with lower Cu 2p binding energy. Additionally, the Fermi energy of STC was much higher than that of PTC. These mineralogical differences were in good agreement with the bioleaching behaviors of chalcopyrite. This study will provide some new information for evaluating the oxidation kinetics of chalcopyrite.

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Scanning photoelectron microscopy studies of freshly fractured chalcopyrite exposed to O2 and H2O

Cited by 42 publications

References 58 publications

The Influencing Mechanisms of Sodium Hexametaphosphate on Chalcopyrite Flotation in the Presence of MgCl2 and CaCl2

The Influencing Mechanisms of Sodium Hexametaphosphate on Chalcopyrite Flotation in the Presence of MgCl2 and CaCl2

Chalcopyrite Dissolution at 650 mV and 750 mV in the Presence of Pyrite

Bioleaching of two different genetic types of chalcopyrite and their comparative mineralogical assessment

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