A review on electrochemical behavior of pyrite in the froth flotation process

Moslemi, Hossein; Gharabaghi, Mahdi

doi:10.1016/j.jiec.2016.12.012

Cited by 87 publications

(33 citation statements)

References 210 publications

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“…Pyrite (FeS 2 ) is the main gangue associated with valuable sulfide ores, such as galena, chalcopyrite, sphalerite, and others [1][2][3][4][5]. Pyrite is usually depressed during the flotation of sulfide minerals [6] by the use of a depressant [4,7], pulp-environment management [8,9], and grinding-environment changes [10,11].…”

Section: Introductionmentioning

confidence: 99%

Selective Flotation of Pyrite from Galena Using Chitosan with Different Molecular Weights

Zhang

Sun

et al. 2019

Minerals

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Pyrite is a major gangue mineral associated with galena and other valuable minerals, and it is necessary to selectively remove pyrite to upgrade the lead concentrate by froth flotation. In this study, the flotation experiments of a single mineral and mixed minerals were performed using chitosan with different molecular weights (MW = 2−3, 3−6, 10 and 100 kDa) as a depressant, ethyl xanthate as a collector, and terpineol as a frother, in a bid to testify the separation of pyrite from galena. Flotation results showed that the selective flotation of pyrite from galena can be achieved under the preferred reagent scheme, i.e., 400 g/t chitosan (10 kDa), 1600 g/t ethyl xanthate, and 100 g/t terpineol, while chitosan with other molecular weights cannot. Furthermore, the results of the zeta potential and contact angle measurements revealed that chitosan (10 kDa) has a strong adsorption on galena yet a very weak adsorption on pyrite at the dosage of 400 g/t. This study showed that chitosan (10 kDa) has great potential in the industrial flotation separation of pyrite from lead concentrates.

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Section: Introductionmentioning

confidence: 99%

Selective Flotation of Pyrite from Galena Using Chitosan with Different Molecular Weights

Zhang

Sun

et al. 2019

Minerals

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“…This inverse relationship between recovery and pH has been associated with the greater abundance of hydrophilic hydroxides concerning hydrophobic sulfides that found on the pyrite surface. This happens because, at alkaline conditions, ferric hydroxide is generated from the ferrous hydroxide released from inside the pyrite [6][7][8]. Subsequently, ferric hydroxide that has a hydrophilic nature precipitates on the surface of the pyrite, decreasing its contact angle and consequently lowering its floatability [9,10].…”

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confidence: 99%

Depression of Pyrite in Seawater Flotation by Guar Gum

Castellón

Piceros

Toro

et al. 2020

Metals

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The application of guar gum for pyrite depression in seawater flotation was assessed through microflotation tests, Focused Beam Reflectance Measurements (FBRM), and Particle Vision Measurements (PVM). Potassium amyl xanthate (PAX) and methyl isobutyl carbinol (MIBC) were used as collector and frother, respectively. Chemical species on the pyrite surface were characterized by Fourier-transform infrared spectroscopy (FTIR) spectroscopy. The microflotation tests were performed at pH 8, which is the pH at the copper sulfide processing plants that operate with seawater. Pyrite flotation recovery was correlated with FBRM and PVM characterization to delineate the pyrite depression mechanisms by the guar gum. The high flotation recovery of pyrite with PAX was significantly lowered by guar gum, indicating that this polysaccharide could be used as an effective depressant in flotation with sea water. FTIR analysis showed that PAX and guar gum co-adsorbed on the pyrite surface, but the highly hydrophilic nature of the guar gum embedded the hydrophobicity due to the PAX. FBRM and PVM revealed that the guar gum promoted the formation of flocs whose size depended on the addition of guar gum and PAX. It is proposed that the highest pyrite depression occurred not only because of the hydrophilicity induced by the guar gum, but also due to the formation of large flocs, which could not be transported by the bubbles to the froth phase. Furthermore, it is shown that an overdose of guar gum hindered the depression effect due to redispersion of the flocs.Metals 2020, 10, 239 2 of 15 pyrite declines by rising the pH [3][4][5]. This inverse relationship between recovery and pH has been associated with the greater abundance of hydrophilic hydroxides concerning hydrophobic sulfides that found on the pyrite surface. This happens because, at alkaline conditions, ferric hydroxide is generated from the ferrous hydroxide released from inside the pyrite [6][7][8]. Subsequently, ferric hydroxide that has a hydrophilic nature precipitates on the surface of the pyrite, decreasing its contact angle and consequently lowering its floatability [9,10]. In this way, by regulating the pH with alkalizing agents such as sodium hydroxide, sodium carbonate, or lime, it can make the pyrite no float. An interesting aspect is that lime is more effective compared to sodium hydroxide, which is explained by the participation of calcium ions as, at pH less than 12.5, Ca(OH) + is the main component of the solution. This hydrophilic element has a high affinity for the surface of pyrite, so it also helps to boost their depression. It is common that in the copper industry lime is used as the sole depressant for pyrite, primarily when flotation is carried out in freshwater [11,12]. Interestingly, the use of seawater is a strategy that is being frequently adopted in sectors that have a shortage of freshwater, highlighting mining plants in countries such as Chile, Australia, Indonesia, etc. [13]. However, when the operations are carried out in seawater, these are unlikely t...

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“…Copper sulfate is a widely used activator in pyrite flotation because copper acts as an activator for pyrite. The hydrophobicity of pyrite is enhanced significantly when activated by copper, in a range of pulp potentials from -505 to +595 mV, and in the range of pH from 4.7 to 11 (Moslemi & Gharabaghi, 2017).…”

Section: Activatorsmentioning

confidence: 99%

“…The proposed mechanism of activation is that Cu 2+ adsorbs on the sulfide sites at slightly acidic pH and is reduced to Cu + as the disulfide is oxidised (Moslemi & Gharabaghi, 2017;. The formation of Cu(OH)2 is observed at pH values greater than 6 .…”

Section: Activatorsmentioning

confidence: 99%

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Influence of Muscovite Content on the Flotation of Pyrite and Arsenopyrite

Avelar¹

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Contributions by others to the thesis My supervisors Dr Cathy Evans and Dr Kym Runge provided technical support on the project development, the design of the experimental program, data analysis, and critically reviewed the thesis. Dr Barun Gorain provided the data of Barrick's project, which was the start point of this thesis, and valuable guidance on the development of the project with my supervisors Dr Emmy Manlapig and Dr Chris Fountain, who made significant contribution to set up the scope of the project. Dr Elaine Wightman, Kellie White and Dr Cathy Evans provided assistance in the mineralogical characterisation using MLA of Barrick's reference ore. Dr Alex-Anthony Cavallaro performed ToF-SIMS and Dr Chris Bassell performed the XPS analysis of the flotation samples in the University of South Australia. Dr Susana Brito e Abreu provided assistance in the interpretation of the surface analysis data.

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A review on electrochemical behavior of pyrite in the froth flotation process

Cited by 87 publications

References 210 publications

Selective Flotation of Pyrite from Galena Using Chitosan with Different Molecular Weights

Selective Flotation of Pyrite from Galena Using Chitosan with Different Molecular Weights

Depression of Pyrite in Seawater Flotation by Guar Gum

Influence of Muscovite Content on the Flotation of Pyrite and Arsenopyrite

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