Zeta potential study of pentlandite in the presence of serpentine and dissolved mineral species

Álvarez-Silva, M.; Uribe‐Salas, A.; Waters, Kristian E.; Finch, J.A.

doi:10.1016/j.mineng.2015.10.018

Cited by 37 publications

(12 citation statements)

References 19 publications

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“…collector adsorption) and particle–particle interactions (e.g. hetero-aggregation) [ 26 ]. Figure 6 shows the ζ -potential of cassiterite as a function of pH in the presence of metal ions, and the IEP of cassiterite alone was located at a solution pH of 3.2, which is lower compared with that of 4.2, 5.0 reported in the literature [ 10 , 24 , 27 ].…”

Section: Resultsmentioning

confidence: 99%

Inhibition mechanism of Ca ²⁺ , Mg ²⁺ and Fe ³⁺ in fine cassiterite flotation using octanohydroxamic acid

et al. 2018

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The existence of metal ions should not be ignored in both hydrometallurgy and flotation. In this study, the effects of Ca2+, Mg2+ and Fe3+ on the flotation performance of cassiterite using octanohydroxamic acid (OHA) as the collector were investigated by micro-flotation tests, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectroscopy, contact angle, zeta (ζ) potential measurements and atomic force microscopy (AFM) imaging. The results of the flotation and contact angle experiments showed that the addition of Ca2+, Mg2+ and Fe3+ significantly decreased both the recovery and contact angle of cassiterite with pH ranged from 6.0 to 12.0 in the presence of OHA collector. ζ-Potential measurements, solution chemistry analysis and FTIR measurements indicated that the flotation recovery of the cassiterite declined due to the CaOH+, MgOH+ and Fe(OH)3 sites on the cassiterite surface. XPS results indicated that the chemisorption of OHA and calcium ions on the cassiterite surface finally changed its chemical properties. The AFM images also revealed that new species Fe(OH)3 of Fe3+ formed and adsorbed on the cassiterite surface at pH 9.0. The adsorption of Fe(OH)3 reduced the adsorption of OHA on the cassiterite surface, thus the hydrophobicity of cassiterite was deteriorated.

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Section: Resultsmentioning

confidence: 99%

Inhibition mechanism of Ca ²⁺ , Mg ²⁺ and Fe ³⁺ in fine cassiterite flotation using octanohydroxamic acid

et al. 2018

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“…The surface hydroxyls of fine serpentine dissolve preferentially in an aqueous solution, and Mg 2+ ions remain on the serpentine surface, which makes the surface charge of serpentine stronger and its point of zero charge around a pH of 10.0 [5,6]. In weak alkaline pulp, the surface of sulfide minerals is generally negatively charged, and fine serpentine with a positive charge is adsorbed on the sulfide mineral surface with negative charge under the action of an electrostatic adsorption force, which makes the difference in the hydrophobicity and surface properties of sulfide minerals significantly reduced and deteriorates the flotation behavior of sulfide minerals [6,7]. In view of this property of serpentine, some researchers have used serpentine as an inhibitor for the flotation separation of galena and pyrite [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Surface Charge on the Separation of Pyrite from Serpentine by Flotation

Long

Xiao

2019

Minerals

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Serpentine, a magnesium silicate mineral with positive surface charge in many sulfide ores around the world, usually deteriorates the flotation behavior by covering the target mineral surface. In this paper, the effect of surface potential regulation on serpentine flotation was revealed by flocculation experiments, zeta potential measurements, infrared spectrum analysis, and DLVO theoretical calculations. The experimental results of flocculation and sedimentation show that heterogeneous coagulation easily occurs between serpentine and pyrite particles, which reduces the floatability of pyrite. Reducing the surface potential of serpentine is an effective way to eliminate heterogeneous coagulation between minerals. The key to regulating the surface potential of serpentine is Mg2+ ion dissolution from the serpentine surface to the liquid phase. Phosphates, especially sodium hexametaphosphate, can enhance Mg2+ ion dissolution from the serpentine surface to the liquid phase and react with Mg2+ ions in the liquid phase to form stable soluble complexes.

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“…The process is known as "slime coating". Slime coating is d irectly related to the surface charge difference between the sulphide minerals and serpentine in aqueous solution [8,9]. Serpentine has a point of zero charge (PZC) at pH value of 9.5 while sulphide minerals normally have PZCs below 7 [10].…”

Section: Introductionmentioning

confidence: 99%

Role of magnesium-bearing silicates in the flotation of pyrite in the presence of serpentine slimes

Yang

Xie

et al. 2018

Powder Technology

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Flotation is the most effective separation solution used in sulphide ore beneficiat ion. In sulphide ore flotation, the interaction between the valuable sulphide minerals and the gangues are complex. Serpentine, a co mmon ma gnesiu m-bearing silicate mineral in sulphide ores, can largely depress the flotation of the valuable sulphide minerals by adhering at their surfaces (i.e. slime-coating). In contrast, quartz can mitigate the depressing of the valuable minerals by serpentine. This work studied the effect of two common magnesium-bearing silicate minerals in sulphide ores (i.e. pyro xene and olivine) on the flotation of pyrite which was used as a model sulphide mineral. It was found that, similar to quartz, pyro xene and olivine could significantly imp rove the recovery of pyrite depressed by serpentine. Zeta potential measurements and turbidity experiments showed that serpentine could aggregate with pyroxene and olivine in aqueous solution via electrostatic interaction. Furthermore, DLVO calcu lation revealed that serpentine preferentially interact ed with pyro xene and olivine rather than pyrite, resulting in increased pyrite recovery by stripping serpentine from pyrite surface.

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Zeta potential study of pentlandite in the presence of serpentine and dissolved mineral species

Cited by 37 publications

References 19 publications

Inhibition mechanism of Ca ²⁺ , Mg ²⁺ and Fe ³⁺ in fine cassiterite flotation using octanohydroxamic acid

Inhibition mechanism of Ca ²⁺ , Mg ²⁺ and Fe ³⁺ in fine cassiterite flotation using octanohydroxamic acid

The Effect of Surface Charge on the Separation of Pyrite from Serpentine by Flotation

Role of magnesium-bearing silicates in the flotation of pyrite in the presence of serpentine slimes

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Zeta potential study of pentlandite in the presence of serpentine and dissolved mineral species

Cited by 37 publications

References 19 publications

Inhibition mechanism of Ca 2+ , Mg 2+ and Fe 3+ in fine cassiterite flotation using octanohydroxamic acid

Inhibition mechanism of Ca 2+ , Mg 2+ and Fe 3+ in fine cassiterite flotation using octanohydroxamic acid

The Effect of Surface Charge on the Separation of Pyrite from Serpentine by Flotation

Role of magnesium-bearing silicates in the flotation of pyrite in the presence of serpentine slimes

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Inhibition mechanism of Ca ²⁺ , Mg ²⁺ and Fe ³⁺ in fine cassiterite flotation using octanohydroxamic acid

Inhibition mechanism of Ca ²⁺ , Mg ²⁺ and Fe ³⁺ in fine cassiterite flotation using octanohydroxamic acid