Interactions in the sphaleriteCaSO4CO3 systems

Sui, C.; Rashchi, Fereshteh; Xu, Zhenghe; Kim, J.; Nesset, Jan E.; Finch, J.A.

doi:10.1016/s0927-7757(97)00336-1

Cited by 28 publications

(16 citation statements)

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“…Sui et al (1998) showed an increase in the zeta potential of sphalerite in the presence of Ca or CaSO 4 (Figure 2.5). They demonstrated that the effect on zeta potential is due to Ca 2+ ions and not to the precipitates of CaSO 4 and additionally attributed the increased zeta potential to the adsorption of Ca 2+ or Ca-hydroxy species.…”

Section: Effect Of Calcium-magnesium-sulphate Ions On Activationmentioning

confidence: 94%

“…The depressant effect of Ca 2+ ions on sphalerite has been demonstrated (Ikumapayi, 2010;Ikumapayi et al, 2012;Sui et al, 1998); it was revealed that Ca 2+ ions adsorbed on the mineral increasing its superficial charge and significantly decreasing the number of available sites for Cu adsorption during the activation stage. Precipitation of gypsum, resulting from the high concentration of calcium and sulphate, decreases the flotability of sphalerite (Grano et al, 1995).…”

Section: Effect Of Calcium-magnesium-sulphate Ions On Activationmentioning

confidence: 98%

“…When water is at metastable equilibrium, the sulphate concentration could be at the saturation condition. However, typical process waters have calcium concentrations in the order of 700 mg/L (Deng et al, 2013b;Girczys et al, 1972;Grano et al, 1995;Sui et al, 2000;Sui et al, 1998).…”

Section: Effect Of Calcium-magnesium-sulphate Ions On Activationmentioning

confidence: 99%

“…Nevertheless, the simultaneous existence of both ions decreased the contact angle from 28.7° to 19.6°. (Sui et al, (1998) …”

Section: Effect Of Calcium-magnesium-sulphate Ions On Activationmentioning

confidence: 99%

“…The presence of calcium is due to the use of calcium hydroxide as a pH or greater for metastable supersaturation (Deng et al, 2013b;Grano et al, 1995;Levay et al, 2001;Sui et al, 2000;Sui et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Effect Of Calcium-magnesium-sulphate Ions On Activationmentioning

confidence: 94%

Section: Effect Of Calcium-magnesium-sulphate Ions On Activationmentioning

confidence: 98%

Section: Effect Of Calcium-magnesium-sulphate Ions On Activationmentioning

confidence: 99%

“…Nevertheless, the simultaneous existence of both ions decreased the contact angle from 28.7° to 19.6°. (Sui et al, (1998) …”

Section: Effect Of Calcium-magnesium-sulphate Ions On Activationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bubble attachment and Amyl Xanthate adsorption to copper-activated sphalerite

Ejtemaei¹

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Sphalerite/silica interaction: Zeta potential distribution measurement

Ren

et al. 2014

Rare Met.

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Collectorless flotation of marmatite with pine oil

et al. 2015

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The interaction between pine oil and marmatite without collectors and activators was investigated by flotation, scanning electron microscope and energy-dispersive spectrometer (SEM-EDS), infrared (IR) spectroscopy, Zeta potential, and first-principle theory calculations. The flotation results show that marmatite exhibits considerable floatability with the addition of pine oil. SEM-EDS results show that carbon atomic ratios on the surface are significantly high, which suggests that the flotation of marmatite is caused by the adsorption of pine oil. Further evidence of the adsorption mechanism was given by IR, and Zeta potential examining pine oil depends on the physical adsorption on the surface independently. The first-principle theory calculations indicate that pine oil molecule adsorbs on Zn and Fe atom surfaces by ionic bond and covalent bond of adsorption energies of -1.23and -1.51 eV, respectively. P orbital of O atom, s orbital of Zn atom, and d orbital of Fe are the major participants.

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Interactions in the sphaleriteCaSO4CO3 systems

Cited by 28 publications

References 1 publication

Bubble attachment and Amyl Xanthate adsorption to copper-activated sphalerite

Bubble attachment and Amyl Xanthate adsorption to copper-activated sphalerite

Sphalerite/silica interaction: Zeta potential distribution measurement

Collectorless flotation of marmatite with pine oil

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