Incipient oxidation of fractured pyrite surfaces in air

Schaufuß, Andrea G; Nesbitt, H.W.; Kartio, I.; Laajalehto, K.; Bancroft, G.M.; Szargan, R.

doi:10.1016/s0368-2048(98)00237-0

Cited by 166 publications

(99 citation statements)

References 32 publications

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“…The occurrence or lack of the Se(0), Se(IV), and Fe 3+ XPS signature peaks is indicated by 'Yes' or 'No', respectively. Schaufuss et al, 1998). The Fe(II)-O feature can be assigned to surface hydroxylation processes (Eggleston et al, 1996), or to hydrated Fe 2+ sorbed at the pyrite surface (Descostes et al, 2010), while the presence of Fe(III)-S may originate from the breaking of Fe-S bonds at the surface, with an electron being transferred from iron to sulfur, and inducing the formation of Fe 3+ surface sites (Elsetinow et al, 2000;Murphy and Strongin, 2009).…”

Section: Tablementioning

confidence: 99%

Redox reaction of aqueous selenite with As-rich pyrite from Jiguanshan ore mine (China): Reaction products and pathway

Kang¹,

Bardelli²,

Charlet³

et al. 2014

Applied Geochemistry

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Section: Tablementioning

confidence: 99%

Redox reaction of aqueous selenite with As-rich pyrite from Jiguanshan ore mine (China): Reaction products and pathway

Kang¹,

Bardelli²,

Charlet³

et al. 2014

Applied Geochemistry

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“…An energy loss (EL) feature has been fitted at approximately 164.5 eV, which is associated with S 3p to Fe eg excitation (Schaufuß et al, 1998;Peng et al 2012). Another doublet with the S 2p3/2 binding energy at 163.4 eV was fitted in the spectra of the sample with stainless steel regrinding, which was attributed to the polysulphide Sn 2- (Smart et al 1999).…”

Section: Pyrite Flotation After Regrinding With Different Grinding Mediamentioning

confidence: 97%

“…eV is from disulphide S2 2- Schaufuß et al, 1998;Smart et al 1999). An energy loss (EL) feature has been fitted at approximately 164.5 eV, which is associated with S 3p to Fe eg excitation (Schaufuß et al, 1998;Peng et al 2012).…”

Section: Pyrite Flotation After Regrinding With Different Grinding Mediamentioning

confidence: 99%

“…The Fe 2p XPS spectra from pyrite surfaces before and after regrinding with different grinding media are shown in Figure 4.4. Fe 2+ in the pyrite bulk is represented by a narrow single peak with a binding energy of 707.1 eV, and Fe 2+ on the surface appears as a tail with about 0.5 eV higher binding energy (Buckley and Woods 1987, Schaufuß et al 1998 Table 4.2. Previous studies indicated that mild steel media produced a much higher amount of iron oxidation species than high chromium or stainless steel media, depressing the flotation (Peng et al 2003a, Peng et al 2003b).…”

Section: Pyrite Flotation After Regrinding With Different Grinding Mediamentioning

confidence: 99%

“…The Fe 2p XPS spectra are shown in Figure 6.5 (b). Fe 2+ in the pyrite bulk is represented by a narrow single peak with a binding energy of 707.0 eV, and Fe 2+ on the surface appears as a tail with about 0.5 eV higher binding energy (Buckley and Woods 1987, Schaufuß et al 1998. The broad peak centred at 711.1 eV is attributed to Fe 3+ -O/OH species (Buckley andWoods 1987, Schaufuß et al 1998).…”

Section: Pre-aeration Before Cleaner Flotationmentioning

confidence: 99%

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The effect of regrinding chemistry and particle breakage mechanisms on subsequent cleaner flotation

Chen¹

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Regrinding rougher flotation concentrates is typically used to liberate valuable minerals from gangue prior to the cleaner separation stage in processing of low grade ores. Compared to the rougher flotation after primary grinding, it is usually more challenging to achieve a satisfactory performance in post-regrind cleaner flotation especially when fine particles are generated. One main factor which results in this reduction in flotation is the unsuitable particle surfaces produced after regrinding. However, this factor is not usually considered when designing and optimizing the regrinding process.Extensive studies have demonstrated that grinding chemistry can influence mineral floatability.However, earlier studies focused on primary grinding and rougher flotation rather than regrinding and cleaner flotation. In addition, different types of regrind mills are used in industry, and these provide different particle breakage mechanisms which may also influence mineral floatability.Therefore, the overall objective of this thesis study is to investigate the effects of regrinding chemistry and particle breakage mechanisms on the cleaner flotation. The implementation of regrinding in the copper and pyrite flotation circuits at Telfer gold mine was taken as a case study and four research areas were addressed with the objective of developing fundamental understanding to provide practical guidance for the plant operation. The four areas investigated are:1. Effect of regrinding chemistry on copper activation of pyrite and its flotation; 2. Separation of different copper sulphide minerals from pyrite after regrinding; 3. Importance of pulp chemistry during regrinding rougher concentrates; 4. Effect of particle breakage mechanisms on subsequent flotation.In this study, it was found that copper activation of pyrite and its flotation in the cleaner stage were affected by regrinding. In general, a decrease in surface concentration of collectors due to the increased surface area after regrinding contributed to the low pyrite recovery in the cleaner. Surface analysis revealed that both the surfaces that were carried from the rougher flotation concentrate and those which were freshly created were modified by the strong electrochemical reactions occurring inside the regrind mill. Stainless steel media promoted pyrite oxidation, especially on the copper activated surfaces. Mild steel media produced a greater amount of iron oxidation species which could adsorb on the carried surfaces. It was also found that mild steel media generated a reducing condition which favoured the copper activation on the freshly created surfaces.ii The research has also shown that the separability of chalcopyrite and chalcocite from pyrite was significantly different after regrinding, which was related to their electrochemical properties.Chalcocite was more active and therefore presented a stronger galvanic interaction with pyrite.Consequently chalcocite was more oxidised, which not only depressed its flotation but also produced sufficient copper ions...

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Surface Science and Flotation

Buckley¹

2020

Surface and Interface Science

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Incipient oxidation of fractured pyrite surfaces in air

Cited by 166 publications

References 32 publications

Redox reaction of aqueous selenite with As-rich pyrite from Jiguanshan ore mine (China): Reaction products and pathway

Redox reaction of aqueous selenite with As-rich pyrite from Jiguanshan ore mine (China): Reaction products and pathway

The effect of regrinding chemistry and particle breakage mechanisms on subsequent cleaner flotation

Surface Science and Flotation

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