An electrochemical investigation of the natural flotability of chalcopyrite

Gardner, JR; Woods, R.

doi:10.1016/0301-7516(79)90028-0

Cited by 187 publications

(47 citation statements)

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“…Numerous studies of pyrite oxidation under a wide range of conditions have been undertaken, and there has been a significant number of studies of the oxidation of chalcopyrite. In particular, the electrochemical oxidation and reduction of the chalcopyrite surface has been studied by Gardner and Woods (1979), Parker et al (1981a, b); Warren et al (1982); McMillan et al (1982); Kelsall and Page (1984); Biegler and Home (1985); Cattarin et al (1990);and Yin et al (1995). Amongst the many studies of electrochemical and aqueous oxidation of pyrite are Biegler and Swift (1979), McKibben and Barnes (1986), Moses et al (1987), Mishra and Osseo-Asare (1992), Moses and Herman (1991), Tao et al (1994), Williamson and Rimstidt (1994) and Kelsall et al (1996).…”

Section: Introductionmentioning

confidence: 99%

Surface oxidation studies of chalcopyrite and pyrite by glancing-angle X-ray absorption spectroscopy (REFLEXAFS)

et al. 1999

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The oxidation of chalcopyrite and pyrite was examined using Fe-K-and Cu-K-edge REFLEXAFS spectroscopy. The Fe XANES of the pyrite proved to be a very sensitive indicator of oxidation, revealing the development of a goethiteqike surface species; the EXAFS data showed an increasing O:S ratio with the degree of oxidation and gave Fe-O distances of c. 1.9 A. On the oxidized chalcopyrite surfaces, the development of Fe-O and Cu-O species was observed, with both the XANES and EXAFS revealing the progressive development of these species with oxidation. Differences in the sensitivity of the XANES and EXAFS to the degree of oxidation can be related to the degree of long range order and changes in the intensity of the pre-edge feature of the Fe are a function of its oxidation state and coordination geometry in the surface species.

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Section: Introductionmentioning

confidence: 99%

Surface oxidation studies of chalcopyrite and pyrite by glancing-angle X-ray absorption spectroscopy (REFLEXAFS)

et al. 1999

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“…Semiconductor properties of chalcopyrite and pyrite can be more beneficial in this case allowing easier flow of electron transfer through it. Hydrophobicity and degree of flotation of pyrite depends on redox oxidation capability [17][18]. Electrochemical techniques, especially cyclic voltammetry can detect the intermediate redox reactions on the mineral surface under certain potentials.…”

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confidence: 99%

Electrochemical investigation of mineral electrodes in phosphate-buffered alkaline solution

2014

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Cyclic voltammetric methods have been applied to study the electrochemical behavior of the sulfide minerals in phosphate-buffered alkaline solution. The redox process of electrodes of sulfide ores was investigated using silicone-impregnated graphite electrode. The cathodic and anodic reaction products in alkaline solution were determined within the potential range of -2V to +2V (vs. Ag/AgCl). The several successive measurement cycles’ voltammograms leads to the appearance of a new anodic peak at E = 450mV, which is absent in the first cycle and curves, as well as other features that appear in cycling, can probably be explained by secondary electrochemical transformations of the products formed by the oxidation of the original pyrite at the interface between the electrode material.DOI: http://doi.dx.org/10.5564/mjc.v15i0.318 Mongolian Journal of Chemistry 15 (41), 2014, p33-35

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“…Unlike the previous electrochemical studies by Gardner and Woods (1979), it was concluded that a metaldeficient sulphide lattice rather than elemental sulphur was formed by the oxidation of chalcopyrite. Buckley and Woods (1984) proposed that the exposure of chalcopyrite to air resulted in iron atoms migrating to the surface to form an iron hydroxide, with the formation of a sulphur-rich copper sulphide with stoichiometry CuS2.…”

Section: Chalcopyrite Oxidation and Flotationmentioning

confidence: 63%

“…Gardner and Woods (1979) identified the electron transfer reactions taking place at a chalcopyrite electrode by employing linear potential sweep voltammetry. From the voltammograms, coupled with bulk thermodynamic data, it was indicated that the products of the oxidation reaction were CuS, Fe(OH)3 and elemental sulphur.…”

Section: Chalcopyrite Oxidation and Flotationmentioning

confidence: 99%

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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An electrochemical investigation of the natural flotability of chalcopyrite

Cited by 187 publications

References 8 publications

Surface oxidation studies of chalcopyrite and pyrite by glancing-angle X-ray absorption spectroscopy (REFLEXAFS)

Surface oxidation studies of chalcopyrite and pyrite by glancing-angle X-ray absorption spectroscopy (REFLEXAFS)

Electrochemical investigation of mineral electrodes in phosphate-buffered alkaline solution

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

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