Electrochemistry of Flotation of Sulphide Minerals

Hu, Yuehua; Sun, Wei; Wang, Dianzuo

doi:10.1007/978-3-540-92179-0

Cited by 52 publications

(46 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Theoretically, the double-layer capacitance depends on the dielectric property (the effective dielectric constant) and the thickness of the electrical double layer [19]. Usually, the dielectric constant for organic matter (around 4-8) is significantly smaller than that of water molecules (around 80.1 at 20 C) [35]. Therefore, upon adsorption of PAX, the decrease of the dielectric constant between the electrode/electrolyte surfaces results in a consequent decrease in the capacitance value.…”

Section: Characterization Of Pyrite Oxidation and Xanthate Adsorptionmentioning

confidence: 99%

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

Peng

Lauten³

2015

Electrochimica Acta

View full text Add to dashboard Cite

Section: Characterization Of Pyrite Oxidation and Xanthate Adsorptionmentioning

confidence: 99%

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

Peng

Lauten³

2015

Electrochimica Acta

View full text Add to dashboard Cite

“…A suitable pH for sulfide flotation strongly depends on the type of the collector. Suitable pH ranges for sulfide flotation by xanthates is 8–13 and Pyrite is depressed at pH more than 11, independent of xanthate concentration. Under such alkaline condition, it is widely accepted that exposed pyrite surfaces are mainly covered by iron oxides and hydroxides.…”

Section: Physico‐chemical Process (Flotation)mentioning

confidence: 98%

Desulfurization of Iron Ores: Processes and Challenges

Rezvanipour

Mostafavi

Ahmadi

et al. 2018

steel research int.

View full text Add to dashboard Cite

Various studies have been increasingly performed on the reduction of sulfur content of iron ores and concentrates. The presence of sulfur in these materials causes technical problems in steel and alloys and environmental issues in the sintering of iron ore process. The achievement of higher sulfur removal rates has been an important goal since the development of sulfur removal techniques. In this research, an effort is made to separately introduce the various processes, industrial practices, and fundamental research activities to remove sulfur from iron ores, concentrates, or roasted iron ores. In this way, the optimized condition and latest innovations in sulfur removal using flotation are reviewed and the development of leaching and bioleaching techniques for sulfur reduction is introduced; following the development of thermal decomposition, physical separation methods, and magnetic separation technique are discussed. In each section, a brief introduction of fundamentals for the sulfur removal techniques and their potential advantages for sulfur removal are described and challenges for each technique are presented. Finally, the techniques are compared from technical, economic and environmental viewpoints, and future trends in desulfurization of iron ores are presented.

show abstract

“…Dixanthogen formation through the oxidation of the collector ion turns the pyrite surface hydrophobic [39]. This collector oxidation can take place with the reduction of oxygen (Equation (1)).…”

Section: Microflotationsmentioning

confidence: 99%

Depression of Pyrite in Seawater Flotation by Guar Gum

Castellón

Piceros

Toro

et al. 2020

Metals

View full text Add to dashboard Cite

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...

show abstract

Electrochemistry of Flotation of Sulphide Minerals

Cited by 52 publications

References 0 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

Desulfurization of Iron Ores: Processes and Challenges

Depression of Pyrite in Seawater Flotation by Guar Gum

Contact Info

Product

Resources

About