Mechanisms of pyrite flotation with xanthates

Wang, Xianghuai; Forssberg, K.S.E.

doi:10.1016/0301-7516(91)90058-q

Cited by 91 publications

(51 citation statements)

References 12 publications

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“…However, recently, the general conclusion that dixanthogen is the only species responsible for pyrite flotation has been questioned. 26 It has been shown with detailed thermodynamic calculationsz6. 2 7 that ferric ethyl xanthates are stable under moderate oxidizing conditions in weakly acidic to alkaline pH solutions.…”

Section: Anionic Flotation Of Pyritementioning

confidence: 99%

Electrolytic flotation of pyrite

Kydros

Gallios

Matis

1994

J of Chemical Tech & Biotech

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Electrolytic flotation, a rather unconventional flotation technique used in effluent treatment, was investigated on pyrite; the process was enhanced by xanthate and also a cationic collector. This was then compared with classical floatability experiments. Zeta-potential measurements, under similar pulp conditions, were carried out to explain the process mechanism. The mineral flotation behavior in the presence of common modifiers was also examined during electrolytic flotation. The latter produces fine gas bubbles, has favorable hydrodynamic conditions and assists in flocculation of particles prior to flotation, as shown.

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Section: Anionic Flotation Of Pyritementioning

confidence: 99%

Electrolytic flotation of pyrite

Kydros

Gallios

Matis

1994

J of Chemical Tech & Biotech

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“…The oxidation products of the disulphide ion in pyrite e.g., S 2 O 7 -2 and S 2 O 8 -2 are proposed to be responsible for the oxidation of xanthate ions to dixanthogen [23] which is the species responsible for flotation when xanthate is added as collector [8,15,24,25].…”

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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“…Table 6.6 displays binding energy and atomic percent of Cu 2p, Fe 2p, O 1s, C 1s and S 2p spectra collected from Cu-activated pyrite and the activated sample conditioned in 1 mM AX solution. New components formation after Cu-activation of pyrite has been discussed previously (Ejtemaei and Nguyen, 2016a (Fornasiero and Ralston, 1992;Mielczarski et al, 1996;Wang and Forssberg, 1991). Cu(I) peak at 932.3 eV could be due to the Cuxanthate formation.…”

Section: Surface Composition Of Collectors Treated Cu(ii) Activated Smentioning

confidence: 51%

“…Critehley and Hunter (1986) considered ferric hydroxyl xanthates not to be hydrophobic, and to be unimportant as a collector species. Others have suggested that the ferric hydroxyl xanthate, while weakly hydrophobic itself, could act as a contact site for adsorption of xanthate ions (Wang and Forssberg, 1991) and/or dixanthogen (Agar, 1989;Wang and Forssberg, 1991), the resulting species being strongly hydrophobic.…”

Section: Effect Of Process Water Chemistry On Activationmentioning

confidence: 99%

“…The similar reaction could happen between Fe(OH) 2(surface) and X -ions in pyrite flotation using thiol collectors (Fornasiero and Ralston, 1992). However, the available literature (Fornasiero and Ralston, 1992;Leppinen, 1990;Mikhlin et al, 2016a;Wang and Forssberg, 1991) proposes that the dixanthogen would be the main surface product of the interaction of xanthate with pyrite.…”

Section: Introductionmentioning

confidence: 98%

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Bubble attachment and Amyl Xanthate adsorption to copper-activated sphalerite

Ejtemaei¹

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Sphalerite (ZnS) is a primary source of zinc metal. It usually coexists with other sulphide minerals such as pyrite (FeS 2 ) and galena (PbS). Its concentration is accomplished by froth flotation using short-chain thiol collectors such as xanthate. Due to its unique chemical and structural characteristics, the concentration of sphalerite by flotation requires Cu-activation, which is a process of making the mineral susceptible to reactions with the thiol collectors. The high amount of copper sulphate consumption is a big challenge for zinc processing plants, and the parameters that lead to a significant amount of copper sulphate usage for sphalerite activation is not wellunderstood. Based on the literature review and zinc processing plants reports, process water quality and the presence of pyrite during sphalerite Cu-activation could be two main factors affecting the activation that are the main focus of this thesis.To develop insight into mechanisms of Cu-activation of sphalerite and pyrite, Cryogenic X-ray Photoelectron Spectroscopic (Cryo-XPS) and zeta potential measurements were applied. The Cryo-XPS results showed that Cu-activation of sphalerite was an ion exchange reaction with CuS-type layer formation, while pyrite Cu-activation was governed by redox reactions with CuFeS 2 -type layer development. Depth profiling after 10 min activation revealed Cu diffusion into the sphalerite lattice up to 10 nm, while the thickness of the activation product on pyrite surface was less than 3 nm. The zeta potential studies confirmed proposed surface products on the minerals by Cryo-XPS.Hydrophobicity and many other surface properties of Cu-activated sphalerite can be changed by dissolved ions available in the process water (e.g. calcium, magnesium and sulphate). The effect of Ca(NO 3 ) 2 , Mg(NO 3 ) 2 , MgSO 4 and CaSO 4 on the surface properties of Cu-activated sphalerite was studied using sessile drop Contact Angle (CA), Cryo-XPS and zeta potential measurements. The CA measurements showed that the hydrophobicity of sphalerite developed after Cu-activation, but the presence of 3×10 -2 M Ca(NO 3 ) 2 or Mg(NO 3 ) 2 or MgSO 4 decreased its hydrophobicity. The XPS data showed that the effect of these ions appeared to be the same, namely a decrease in Cu adsorption and polysulphide formation. Zeta potential measurements confirmed the presence of calcium and magnesium ions on the sphalerite surface.Sphalerite is not the only sulphide mineral whose flotation behaviour can be affected by the presence of Cu ions in solution. The possibility of inadvertent Cu-activation of pyrite and its undesirable flotation is one factor accounting for the effective separation of sphalerite from pyrite.The surface hydrophobicity and components of the Cu-activated sphalerite were measured to investigate Cu adsorption kinetics of sphalerite in the presence of pyrite using a novel experimental approach of High-Speed Video Microscopy (HSVM) and Cryo-XPS. HSVM method allowed for ii in-situ liquid film Drainage rate (DR) and bubble-mineral CA...

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Mechanisms of pyrite flotation with xanthates

Cited by 91 publications

References 12 publications

Electrolytic flotation of pyrite

Electrolytic flotation of pyrite

Evaluation of Pyrite in a Tailings Dam by Flotation

Bubble attachment and Amyl Xanthate adsorption to copper-activated sphalerite

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