An impedance study of the adsorption of CuSO4 and SIBX on pyrrhotite samples of different provenances

Ekmekçi, Zafir; Becker, Megan; Tekes, E. Bagci; Bradshaw, Dee

doi:10.1016/j.mineng.2010.02.007

Cited by 21 publications

(15 citation statements)

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“…In a study of pyrrhotite from four providences, at pH 7, CuSO 4 was found to have no effect on sodium isobutyl xanthate (SIBX) recovery of Nkomati pyrrhotite, while Phoenix pyrrhotite showed a drop in recovery [9]. At pH 10, the electrochemical impedance values at the surface of all the four pyrrhotite samples increased remarkably and SIBX could not float the samples.…”

Section: Introductionmentioning

confidence: 99%

“…From various reports, the response of pyrrhotite to CuSO 4 activation has been observed to differ among ore deposits, with recovery improvement ranging from 50 % to insignificant [9,13]. In a study of pyrrhotite from four providences, at pH 7, CuSO 4 was found to have no effect on sodium isobutyl xanthate (SIBX) recovery of Nkomati pyrrhotite, while Phoenix pyrrhotite showed a drop in recovery [9].…”

Section: Introductionmentioning

confidence: 99%

“…Although the xanthate compound of any of these metals, having lower dissociation constants compared to that of nickel, will stabilize the surface xanthate product and enhance recovery, copper has been used mostly for many sulphide mineral beneficiation [6][7][8]. However, due to vast shades of variations in mineral occurrences from one deposit to another and even within the same ore body, response to well-known flotation schemes or reagents can vary widely [9]; hence, a conclusion pre-empting the response in this instance cannot be made without due investigations. The mineralogy of this ore body and the chemistry of CuSO 4 interaction in the presence of co-occurring sulphides will have to be carefully considered.…”

Section: Introductionmentioning

confidence: 99%

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Copper activation option for a pentlandite–pyrrhotite–chalcopyrite ore flotation with nickel interest

et al. 2016

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Introduction Different sulphide ores respond differently in the prospect of copper activation to thiols for froth flotation. With the BCL Selebi-Phikwe ore body, pentlanditepyrrhotite-chalcopyrite co-occur and there is the constraint of fine pentlandite dissemination in the pyrrhotite, so that liberation is limited. In the presence of pentlandite, pyrrhotite can even be galvanically depressed. In this scenario, response of the ore to copper activation may not be easily predicted. To explore the possibilities, flotation with various dosages of copper addition was investigated for this ore with specific interest in how the nickel recovery responds. The responses of copper, iron, cobalt and quartz were also monitored. Result Increase in nickel recovery and grade with copper sulphate dosage was obtained, compared with no addition, but the trend showed a maxima after which depression was obtained. The optimum dosage in this instance was between 15 and 30 g/ton for best grade recovery. The response is understandable from the fact that the predominant copper species in the aqueous system can be ion or hydroxide depending on the concentration, among other factors. As ions the copper thus imparts activation, while as hydroxide it will cause depression. Pyrrhotite and chalcopyrite recovery also increased marginally along with the pentlandite. Conclusion To achieve activation of pentlandite in the ore to thiol collector using copper sulphate, the dosage must be about the optimum; higher dosages will bring about depression.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Copper activation option for a pentlandite–pyrrhotite–chalcopyrite ore flotation with nickel interest

et al. 2016

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“…C dl can provide a useful modelling element containing various disturbances due to the physical nature of electrode surface and reactions (surface roughness, "leaky" capacitor, non-uniform current distribution, etc.) (Ekmekç i et al, 2010;Venter and Vermaak, 2008). The surface heterogeneity and roughness of the electrode surface is indicated by a parameter n, usually varying between 0.5 and 1 (Bevilaqua et al, 2004;Guo et al, 2015).…”

Section: Modelling Of Electrochemical Impedance Spectrum Datamentioning

confidence: 99%

“…The measured impedance data can also reflect the kinetics of surface electrochemical reactions in-situ with a minimum of surface modification (De Wet et al, 1997;Niu et al, 2014). Ekmekç i et al (2010) used EIS to study the adsorption of CuSO4 and SIBX on pyrrhotite surface and correlated pyrrhotite impedance with its flotation behaviour. Guo et al (2015) demonstrated that a change in the impedance of pyrite electrode was consistent with the adsorbed xanthate.…”

Section: Introductionmentioning

confidence: 99%

Slime coating mitigation on mineral surfaces in froth flotation by saline water

Zhao¹

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Fine and ultra-fine particle flotation is central to the mining industry as a result of the need to treat low grade and difficult ores which require fine grinding to liberate valuable minerals from gangue minerals. However, the flotation of fine and ultra-fine particles is not efficient and a slime coating with slime gangue particles attaching to valuable minerals is one of the most popular barriers. A slime coating prevents the adsorption of collectors on the surface of valuable minerals resulting in low flotation recovery or low product quality.Saline water is also an important issue in the mining industry. In Western Australia, bore water with a high ionic strength has to be used at mine sites for production, site rehabilitation, and downstream processing because fresh water is not available locally. In Queensland, most mine sites have adopted water re-use as a means for making freshwater savings. However, water re-use results in increased salinity in site water stores, which is driven largely by evaporation and ongoing salt inputs from spoil, minerals and groundwater. Flotation relies on a large amount of water and therefore the impact of saline water on flotation performance has gained more and more attention.In this research, the role of saline water in the mitigation of slime coatings was studied and a generic approach to improve fine and ultra-fine particle flotation by using saline water was developed, building on the previous research. A model slime coating system was established by using copper minerals in the presence of clay particles. It was found that chalcocite flotation was depressed in the presence of bentonite slimes while chalcopyrite flotation was less affected.Electrostatic interactions between copper minerals and clay particles were found to be responsible for the different flotation of chalcocite and chalcopyrite in the presence of clay minerals. It was found that surface oxidation occurred during II grinding and changed the surface properties of chalcopyrite and chalcocite.Chalcocite was strongly oxidized while chalcopyrite was slightly oxidized after the grinding with stainless steel media. The different extent of surface oxidation resulted in the different electrical property of chalcocite and chalcopyrite surfaces.The strongly oxidized chalcocite surface became positively charged after grinding at the same pH and electrostatically attractive to bentonite particles resulting in the depressed chalcocite flotation. In contrast, the slightly oxidized chalcopyrite surface remained negatively charged after grinding at pH 9.0 and entropically repulsive from bentonite slime particles. Therefore, bentonite slimes did not influence chalcopyrite flotation as much as chalcocite flotation.Mitigation of slime coatings on chalcocite in flotation by using electrolytes was further investigated and kaolinite was used to introduce the slime. The results indicated that in tap water, the presence of kaolinite slimes depressed chalcocite flotation. With the addition of electrolytes to the flotation...

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Relating the Flotation Response of Pyrrhotite to the Adsorption of Sodium Carboxymethyl Cellulose and Sodium Isobutyl Xanthate on its Surface in Process Water of a Degrading Quality

Manono,

October,

Corin

2024

Recovery of Values From Low‐Grade and Complex Minerals

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An impedance study of the adsorption of CuSO4 and SIBX on pyrrhotite samples of different provenances

Cited by 21 publications

References 13 publications

Copper activation option for a pentlandite–pyrrhotite–chalcopyrite ore flotation with nickel interest

Copper activation option for a pentlandite–pyrrhotite–chalcopyrite ore flotation with nickel interest

Slime coating mitigation on mineral surfaces in froth flotation by saline water

Relating the Flotation Response of Pyrrhotite to the Adsorption of Sodium Carboxymethyl Cellulose and Sodium Isobutyl Xanthate on its Surface in Process Water of a Degrading Quality

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