Surface nanobubbles on the rare earth fluorcarbonate mineral synchysite

Owens, Camilla L.; Schach, Edgar; Heinig, Thomas; Rudolph, Martin; Nash, George

doi:10.1016/j.jcis.2019.05.014

Cited by 10 publications

(7 citation statements)

References 47 publications

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“…Some hints on this were found using AFM ( Figure 1 and Figure 2 , and Refs. [ 18 , 21 , 22 ]) and cryo-XPS [ 19 , 20 ]. The formation of nanobubbles on essentially oxidized hydrophilic surfaces seems to be suppressed.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, quasi in situ X-ray photoelectron spectroscopy (XPS) studies of the particulate sulfide minerals reacted with xanthate in the slurries, centrifuged and then fast-frozen [ 19 , 20 ], revealed charging effects attributed to cavities separating the hydrophobized mineral particles which may be signatures of gas structures arising on the surfaces under the flotation-related conditions. Owens and co-workers [ 21 , 22 ] have imaged, with non-contact atomic force microscopy, surface nanobubbles on polished cross sections of dolomite and rare earth fluorcarbonate mineral synchysite treated with flotation collectors inducing hydrophobicity of the minerals. Xing et al [ 23 ] have surveyed the hydrophobic force in particle–bubble attachment and concluded that the role of nanobubbles still remains to be identified.…”

Section: Introductionmentioning

confidence: 99%

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Towards Understanding the Role of Surface Gas Nanostructures: Effect of Temperature Difference Pretreatment on Wetting and Flotation of Sulfide Minerals and Pb-Zn Ore

et al. 2020

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Surface nanobubbles at hydrophobic interfaces now attract much attention in various fields but their role in wetting-related phenomena is still unclear. Herein, we report the effect of a preliminary contact of “hot” solids with cold water previously proposed for generation of surface nanobubbles, on wettability of compact materials and flotation of particulate galena (PbS), sphalerite (ZnS), and Pb-Zn sulfide ore. Atomic force microscopy was applied to visualize the nanobubbles at galena crystals heated in air and contacted with cold water; X-ray photoelectron spectroscopy was used to characterize the surface composition of minerals. Contact angles measured with the sessile drop of cold water were found to increase when enhancing the support temperature from 0 to 80 °C for sphalerite and silica, and to pass a maximum at 40–60 °C for galena and pyrite (FeS2) probably due to oxidation of sulfides. The temperature pretreatment depressed the recovery of sulfides in collectorless schemes and improved the potassium butyl xanthate-assisted flotation both for single minerals and Gorevskoye Pb-Zn ore. The results suggest that the surface nanobubbles prepared using the temperature difference promote flotation if minerals are rather hydrophobic and insignificantly oxidized, so the addition of collector and activator (for sphalerite) is necessary.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Towards Understanding the Role of Surface Gas Nanostructures: Effect of Temperature Difference Pretreatment on Wetting and Flotation of Sulfide Minerals and Pb-Zn Ore

et al. 2020

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“…The laboratory-based cryo-XPS has been successfully employed for exploration, among many others, of ion adsorption and electrical double layer structures [182,184], sulfur oxidation products of the reaction of goethite and lepidocrocite with aqueous sulfide [185], surfaces of chalcopyrite upon chemical and bacterial leaching [68,186], xanthate-derived collectors adsorbed on the main sulfide minerals [102,103], and other interfaces (see Figures 1 and 2 as examples). Interestingly, some signatures of surface nanobubbles, whose role in flotation is discussed at present [101,[186][187][188][189][190], were observed as highly inhomogeneous electrostatic charging of sulfide mineral particles reacted with butyl xanthates [102,103] probably due to widespread cavities and rare ice islets on the hydrophobic surfaces.…”

Section: Cryogenic Xpsmentioning

confidence: 96%

X-ray Photoelectron Spectroscopy in Mineral Processing Studies

Mikhlin

2020

Applied Sciences

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Surface phenomena play the crucial role in the behavior of sulfide minerals in mineral processing of base and precious metal ores, including flotation, leaching, and environmental concerns. X-ray photoelectron spectroscopy (XPS) is the main experimental technique for surface characterization at present. However, there exist a number of problems related with complex composition of natural mineral systems, and instability of surface species and mineral/aqueous phase interfaces in the spectrometer vacuum. This overview describes contemporary XPS methods in terms of categorization and quantitative analysis of oxidation products, adsorbates and non-stoichiometric layers of sulfide phases, depth and lateral spatial resolution for minerals and ores under conditions related to mineral processing and hydrometallurgy. Specific practices allowing to preserve volatile species, e.g., elemental sulfur, polysulfide anions and flotation collectors, as well as solid/liquid interfaces are surveyed; in particular, the prospects of ambient pressure XPS and cryo-XPS of fast-frozen wet mineral pastes are discussed. It is also emphasized that further insights into the surface characteristics of individual minerals in technological slurries need new protocols of sample preparation in conjunction with high spatial resolution photoelectron spectroscopy that is still unavailable or unutilized in practice.

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“…In a recent study, Owens et al (2019) used non-contact atomic force microscopy (NC-AFM) to image surface NBS on a lustrous cross-section taking rare earth minerals and indicated that the use of NBS to determine hydrophobicity is particularly applicable to highly complex ores with small particle sizes. Ren et al (2023) found that NBS not only reduces the amount of trapping agent used during flotation, but also improves the flotation and recovery of fine-grained cassiterite, and AFM showed results indicating that NBS can suppress the adsorption of caprylohydroxamic acid (CHA) on the mineral surface.…”

Section: Atomic Force Microscopy (Afm)mentioning

confidence: 99%

Current status of research on nanobubbles in particle flotation

Chen,

Cheng

2024

Physicochem. Probl. Miner. Process.

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Froth flotation, as one of the most widely used separation approaches in mineral processing, is commonly used to recover valuable components from minerals. However, maintaining high flotation efficiencies is a serious challenge for conventional froth flotation in the face of decreasing particle size of the minerals to be sorted. To date, there have been plenty of reports on the software of nano-bubbles (NBS) in flotation, and the experimental consequences show that nano-bubbles' introduction has given rise to improvement's different grades in the recovery of varieties of minerals, which highlights the great potential of nano-bubbles for mineral flotation. Nanobubbles have smaller bubble radii and unusually high stability compared to conventional flotation bubbles, and their related behavior in flotation has been a hot research topic. This paper reviews some of the methods of preparing nanobubbles, equipment techniques for characterizing nanobubbles, factors affecting their stability, and some of the popular doctrines. In particular, the reinforcing mechanism of nanobubbles in the particle flotation process is discussed, first, the nanobubbles improve the electrostatic attractiveness with the particles by achieving the charge inversion while the nanobubbles that was adsorbed on the particles' surface will cover a share of the charge, which decreases the electrostatic repulsive force between the particles; and second, the nanobubbles can act as a bridge between the surfaces of the two particles, which advances the agglomeration between the particles. This review aims to be able to further advance the research related to the industrialization of nanobubbles.

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Surface nanobubbles on the rare earth fluorcarbonate mineral synchysite

Cited by 10 publications

References 47 publications

Towards Understanding the Role of Surface Gas Nanostructures: Effect of Temperature Difference Pretreatment on Wetting and Flotation of Sulfide Minerals and Pb-Zn Ore

Towards Understanding the Role of Surface Gas Nanostructures: Effect of Temperature Difference Pretreatment on Wetting and Flotation of Sulfide Minerals and Pb-Zn Ore

X-ray Photoelectron Spectroscopy in Mineral Processing Studies

Current status of research on nanobubbles in particle flotation

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