Cationic flotation of scheelite from calcite using quaternary ammonium salts as collector: Adsorption behavior and mechanism

Yang, Fan; Sun, Wei; Hu, Yuehua; Long, Sisi

doi:10.1016/j.mineng.2015.07.014

Cited by 55 publications

(21 citation statements)

References 21 publications

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“…Recent work showed that cationic collectors of quaternary ammonium salts improve selectivity of flotation in separation of scheelite from calcite, and this effect is likely the result of differences in the surface charge of the two minerals 7,8 .…”

Section: Introductionmentioning

confidence: 99%

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Surface-Charge Anisotropy of Scheelite Crystals

Gao

Sun

et al. 2016

Langmuir

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Atomic force microscopy was employed to measure the colloidal interactions between silicon nitride cantilever tips and scheelite crystal surfaces in 1 mM KCl solutions of varying pH. By fitting the Derjguin-Landau-Verwey-Overbeek (DLVO) theoretical model to the recorded force-distance curves, the surface-charge density and surface-potential values were calculated for three crystallographic surfaces including {112}, {101}, and {001}. The calculated surface-potential values were negative in both acidic and basic solutions and varied among crystallographic surfaces. The determined surface-potential values were within zeta-potential values reported in the literature for powdered scheelite minerals. The surface {101} was the most negatively charged surface, followed by {112} and {001}. The surface potential for {001} was only slightly affected by pH, whereas the surface potential for both {112} and {101} increased with increasing pH. Anisotropy in surface-charge density was analyzed in relation to the surface density of active oxygen atoms, that is, the density of oxygen atoms with one or two broken bond(s) within tungstate ions located in the topmost surface layer. On a surface with a higher surface density of active oxygen atoms, a larger number of OH(-) are expected to adsorb through hydrogen bonding, leading to a more negatively charged surface.

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Section: Introductionmentioning

confidence: 99%

“…Negative surface charges of scheelite particles, typically somewhat influenced by pH, are well reported in the literature 6,[8][9][10][11][12][13][14] . Electrophoretic mobility measurements are the most widely used in studying (global) surface potential of scheelite particles 15 .…”

Section: Introductionmentioning

confidence: 99%

Surface-Charge Anisotropy of Scheelite Crystals

Gao

Sun

et al. 2016

Langmuir

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“…The free energy of micellization can reflect the strength of the hydrophobic association of surfactants. Generally, the lower the free energy of micellization of surfactants is, the stronger the hydrophobic association is Fan et al (2015). The order of micellization free energy is TDM > NaOl > NaOl/TDM.…”

Section: Surface Tension Measurementsmentioning

confidence: 99%

Flotation Separation of Diaspore and Kaolinite by Using a Mixed Collector of Sodium Oleate-Tert Dodecyl Mercaptan

Man

Wang

et al. 2019

Front. Chem.

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Sodium oleate (NaOl), a collector in diaspore flotation, has been widely used for more than 30 years, while its low selectivity becomes an issue under today's process requirement. This study introduced tert dodecyl mercaptan (TDM) together with NaOl as a mixed collector to improve selectivity in diaspore flotation. We found that using the mixed collector of NaOl/TDM (total concentration 0.1 mM, the molar ratio 8:2 of NaOl: TDM) at pH = 9-10 significantly effectively separated diaspore and kaolinite. Comparing the recovery of Al 2 O 3 and the ratio of Al 2 O 3 to SiO 2 (A/S) treated by NaOl/TDM (pH = 9) and NaOl (pH = 10), the Al 2 O 3 recovery and A/S in concentrate for NaOl/TDM are 7.5% and 2.2 higher than that for NaOl in mixed mineral flotation. Also, surface tension measurements, Zeta potential measurements and Fourier Transform Infrared (FTIR) spectra analysis were used to examine its selectivity from a flotation mechanical perspective. Surface tension measurements show that mixed collector NaOl/TDM has stronger surface activity and hydrophobic association than NaOl. The results of Zeta potential measurements and FTIR spectra analysis indicate that NaOl and TDM can selectively co-adsorb diaspore through physical adsorption. Moreover, the adsorption of TDM promotes the adsorption of NaOl on diaspore. However, when NaOl/TDM treats on kaolinite together, TDM can hardly adsorb on mineral surface, nor can it promote the adsorption of NaOl.

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“…bearing surface species, the interaction of IL cationic moiety might take place physically via electrostatic attractions provided the mineral surface is negatively charged as proposed in Figs. 14 and 15(a) [84,85]. Also, lateral chain-chain associative interactions, reminiscent of the adsorption of surfactants at solid/solution interface, may be invoked to explain the surface interaction of the IL cationic moiety.…”

Section: Il Collector Conformation On Bastnäsite and Monazite Surfacesmentioning

confidence: 99%

“…Also, lateral chain-chain associative interactions, reminiscent of the adsorption of surfactants at solid/solution interface, may be invoked to explain the surface interaction of the IL cationic moiety. This interaction may occur through cation adsorption onto the first chemisorbed IL anionic layer [58,81,85,86] and with the aid of the London dispersion forces between the hydrophobic chains as seen in Figs. 14 and 15(c) [87,88].…”

Section: Il Collector Conformation On Bastnäsite and Monazite Surfacesmentioning

confidence: 99%

Ionic-liquid collectors for rare-earth minerals flotation⿿Case of tetrabutylammonium bis(2-ethylhexyl)-phosphate for monazite and bastnäsite recovery

Azizi

Larachi

Latifi

2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Cationic flotation of scheelite from calcite using quaternary ammonium salts as collector: Adsorption behavior and mechanism

Cited by 55 publications

References 21 publications

Surface-Charge Anisotropy of Scheelite Crystals

Surface-Charge Anisotropy of Scheelite Crystals

Flotation Separation of Diaspore and Kaolinite by Using a Mixed Collector of Sodium Oleate-Tert Dodecyl Mercaptan

Ionic-liquid collectors for rare-earth minerals flotation⿿Case of tetrabutylammonium bis(2-ethylhexyl)-phosphate for monazite and bastnäsite recovery

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