On the cathodic reaction coupled with the oxidation of xanthates at the pyrite/aqueous solution interface

Valdivieso, A. López; López, A.J.; Song, Shaoxian

doi:10.1016/j.minpro.2005.06.006

Cited by 63 publications

(49 citation statements)

References 27 publications

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“…Pyrite surface is readily oxidized and is considered to be of heterogeneous nature after oxidation, and is composed of mosaics of both hydroxide and bare pyrite as shown in Fig. 8(a) [8]. Immersion of pyrite in acid solutions leads to the dissolution of Fe 2+ in the solution or near the surface, leaving behind a hydrophobic iron-deficient sulfur-rich layer.…”

Section: Discussionmentioning

confidence: 99%

“…Alkyl xanthates, known to selectively interact with sulfides and render their surfaces hydrophobic, are the most extensively used collectors in the flotation of base metal sulfide minerals [3,4]. Pyrite responds strongly with xanthates (X À ) in acidic to neutral pH conditions and it is generally acknowledged that dixanthogen (X 2 , oxidation product of xanthate ions) is the main product responsible for pyrite flotation [3,8]. The formation of dixanthogen is an electrochemical process involving charge transfer between pyrite and xanthate accompanied by the reduction of ferric hydroxides species on pyrite surface formed by surface oxidation [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Pyrite responds strongly with xanthates (X À ) in acidic to neutral pH conditions and it is generally acknowledged that dixanthogen (X 2 , oxidation product of xanthate ions) is the main product responsible for pyrite flotation [3,8]. The formation of dixanthogen is an electrochemical process involving charge transfer between pyrite and xanthate accompanied by the reduction of ferric hydroxides species on pyrite surface formed by surface oxidation [8][9][10]. Due to the semi-conductive nature of pyrite, electrochemical techniques have been widely applied in studying pyrite oxidation [7] and the fundamental interaction of xanthate with pyrite [9].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electrochemistry aspects of pyrite in the presence of potassium amyl xanthate and a lignosulfonate-based biopolymer depressant

Peng

Lauten³

2015

Electrochimica Acta

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electrochemistry aspects of pyrite in the presence of potassium amyl xanthate and a lignosulfonate-based biopolymer depressant

Peng

Lauten³

2015

Electrochimica Acta

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“…It reverses the positive surface charge of pyrite in acid pH pulps, and gets it more negative at neutral and alkaline pHs with increasing the xanthate concentration [4,[8][9][10]. There DA VID PUBLISHING D is a general consensus that xanthate makes pyrite hydrophobic adsorbing as dixanthogen and, meanwhile, the loss of positive charge associated with surface ferric hydroxide on the surface resulting in the negative increase in the zeta potential of pyrite.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Pyrite in a Tailings Dam by Flotation

Ceylan¹,

Bulut²,

Göktepe³

2014

JMSE-B

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Abstract:Pyrite is presented as a gangue mineral in most of complex sulphide ores and most of time it is removed as a tailing. However, beneficiation of pyrite from tailings could be important because of its economical value and the environmental concern. This paper presents a research for the enrichment of pyrite from copper plant tailings, Siirt-Madenköy/Turkey, by flotation. Siirt-Madenköy copper mine is operated by Park Electric Production Mining and Industry since 2005. In order to obtain the pyrite from Siirt-Madenköy copper plant tailings, laboratory test work has to be done to determine the type of reagents, the flowsheet and the size of plant. The objective of the company is to develop a pyrite flotation circuit for concentration of pyrite from tailing dam to obtain 750,000 tons/year pyrite concentrate. There are about 4 million tons tailings that containing pyrite in the tailings dam. Experiments were carried out with three different types of tailings from the plant and the pyrite concentrate with 46%Fe and 90% recovery has been obtained. Therefore, this study shows that high grade pyrite with high recovery can be recovered from the tailings.

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“…Laajalehto et al (1999) demonstrated that the new phase on the copper activated pyrite was probably a chalcopyrite type (CuFeS2), and the reduction of Cu 2+ was compensated by the oxidation of iron when chalcopyrite was formed. proposed (Leppinen 1990, Buckley 1994, Valdivieso et al 2005. However, the adsorption of collector on un-activated pyrite surface is minimal at alkaline conditions.…”

Section: Pyrite Activation Mechanism By Copper Ionsmentioning

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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On the cathodic reaction coupled with the oxidation of xanthates at the pyrite/aqueous solution interface

Cited by 63 publications

References 27 publications

Electrochemistry aspects of pyrite in the presence of potassium amyl xanthate and a lignosulfonate-based biopolymer depressant

Electrochemistry aspects of pyrite in the presence of potassium amyl xanthate and a lignosulfonate-based biopolymer depressant

Evaluation of Pyrite in a Tailings Dam by Flotation

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

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