Characterizing mineral wettabilities on a microscale by colloidal probe atomic force microscopy

Babel, Bent; Rudolph, Martin

doi:10.1016/j.mineng.2018.02.003

Cited by 15 publications

(13 citation statements)

References 31 publications

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“…To wipe out any potential contaminations on the mineral surface, samples were then washed up triple with Milli-Q water and blowdried with pressurized air. Detailed information regarding the sample predation and measurement approach was noted elsewhere [47]. The Young-Laplace equation was fitted to calculate the contact angles [48].…”

Section: Contact Angle Measurementmentioning

confidence: 99%

Effect of Power Ultrasound on Wettability and Collector-Less Floatability of Chalcopyrite, Pyrite and Quartz

et al. 2021

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Numerous studies have addressed the role of ultrasonication on floatability of minerals macroscopically. However, the impact of acoustic waves on the mineral hydrophobicity and its physicochemical aspects were entirely overlooked in the literature. This paper mainly investigates the impact of ultrasonic power and its time on the wettability and floatability of chalcopyrite, pyrite and quartz. For this purpose, contact angle and collectorless microflotation tests were implemented on the ultrasonic-pretreated and non-treated chalcopyrite, pyrite and quartz minerals. The ultrasonic process was carried out by a probe-type ultrasound (Sonopuls, 20 kHz and 60 W) at various ultrasonication time (0.5–30 min) and power (0–180 W) while the dissolved oxygen (DO), liquid temperature, conductivity (CD) and pH were continuously monitored. Comparative assessment of wettabilities in the presence of a constant low-powered (60 W) acoustic pre-treatment uncovered that surface of all three minerals became relatively hydrophilic. Meanwhile, increasing sonication intensity enhanced their hydrophilicities to some extent except for quartz at the highest power-level. This was mainly related to generation of hydroxyl radicals, iron-deficient chalcopyrite and elemental sulfur (for chalcopyrite), formation of OH and H radicals together with H2O2 (for pyrite) and creation of SiOH (silanol) groups and hydrogen bond with water dipoles (for quartz). Finally, it was also found that increasing sonication time led to enhancement of liquid temperature and conductivity but diminished pH and degree of dissolved oxygen, which indirectly influenced the mineral wettabilities and floatabilities. Although quartz and pyrite ultrasound-treated micro-flotation recoveries were lower than that of conventional ones, an optimum power-level of 60–90 W was identified for maximizing chalcopyrite recovery.

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Section: Contact Angle Measurementmentioning

confidence: 99%

Effect of Power Ultrasound on Wettability and Collector-Less Floatability of Chalcopyrite, Pyrite and Quartz

et al. 2021

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“…The liquid cell was lled by injecting up to 750 mL of collector, water or depressant solution using a clean disposable plastic nozzle attached to a pipette. The same clean disposable plastic nozzles have previously been used by Babel and Rudolph, 11 with plastic nozzles also being used in other studies. 19,20 The liquid was then heated to between 20 C and 30 C for nanobubble measurements in a temperature controlled room of 21 C AE 1 C. Between measurements the cantilever was cleaned by washing in distilled water then ethanol and again distilled water.…”

Section: Methodsmentioning

confidence: 99%

“…3 Surface nanobubbles are smaller, but have longer lifetimes than their bulk counterparts, and can be formed using electrolysis, to ethanol and water exchange, gas supersaturation and microwaves. [4][5][6][7] Surface nanobubbles have been shown to form on a wide range of surfaces, ranging from pyrolytic graphite graphene to chalcopyrite and galena, [8][9][10][11] and as well as being relevant to the understanding of colloids and surfaces, nanobubbles are thought to play an import role in processes ranging from cancer treatment to decompression sickness. 12,13 Predicting and controlling the size and location of nanobubbles is therefore of interest to a wide range of elds, 14 including in mineral processing, where bulk nanobubbles have been iden-tied as improving the efficiency in otation systems.…”

Section: Introductionmentioning

confidence: 99%

Surface nanobubbles on the carbonate mineral dolomite

et al. 2018

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“…With respect to the volume of the bulk CCP, it appears unlikely that the resin could reach the center area of the rock during embedding where the AFM measurements were carried out. Previous studies with a similar sample preparation did not reveal any influence of the epoxy [44,45]. However, a contamination of the CCP surface with the hardened epoxy polymer during embedding and polishing cannot be completely ruled out.…”

Section: Materials and Sample Preparationmentioning

confidence: 76%

Near-Field Optical Examination of Potassium n-Butyl Xanthate/Chalcopyrite Flotation Products

Firkala

Kuschewski²,

Nörenberg³

et al. 2018

Minerals

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Abstract:The present study introduces scattering-type scanning near-field infrared optical nanospectroscopy (s-SNIM) as a valuable and well-suited tool for spectrally fingerprinting n-butyl xanthate (KBX) molecules adsorbed to chalcopyrite (CCP) sample surfaces. The collector KBX is well known to float CCP and is used in beneficiation. We thus identified KBX reaction products both by IR optical far-and near-field techniques, applying attenuated total internal reflection Fourier-transform infrared spectroscopy (ATR FT-IR) in comparison to s-SNIM, respectively. The major KBX band around 880 cm −1 was probed in s-SNIM using both the tunable free-electron laser FELBE at the Helmholtz-Zentrum Dresden-Rossendorf facility, Germany, and table-top CO 2 laser illumination. We then were able to monitor the KBX agglomeration in patches <500 nm in diameter at the CCP surface, as well as nanospectroscopically identify the presence of KBX reaction products down to the 10 −4 M concentration.

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Characterizing mineral wettabilities on a microscale by colloidal probe atomic force microscopy

Cited by 15 publications

References 31 publications

Effect of Power Ultrasound on Wettability and Collector-Less Floatability of Chalcopyrite, Pyrite and Quartz

Effect of Power Ultrasound on Wettability and Collector-Less Floatability of Chalcopyrite, Pyrite and Quartz

Surface nanobubbles on the carbonate mineral dolomite

Near-Field Optical Examination of Potassium n-Butyl Xanthate/Chalcopyrite Flotation Products

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