Insight into the Influence of Surface Roughness on the Wettability of Apatite and Dolomite

Wang, Xianchen; Zhang, Qin

doi:10.3390/min10020114

Cited by 41 publications

(17 citation statements)

References 47 publications

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“…The following are available online at http://www.mdpi.com/2075-163X/10/9/801/s1, File S1: Calculation of Solid Surface Energy. References [38][39][40][41][42][43][44] are cited in the supplementary materials.…”

Section: Supplementary Materialsmentioning

confidence: 99%

Hydrophobic Agglomeration of Fine Pyrite Particles Induced by Flotation Reagents

et al. 2020

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Flotation reagents can change the surface properties of minerals, leading to differences in the interaction between mineral particles and affecting the mutual aggregation or dispersion of particles. In this work, we studied the role of activator copper sulfate, collector butyl xanthate and frother terpineol in adjusting the potential energy of pyrite particles from the perspective of the interfacial interaction. We evaluated the surface characteristics using contact angle analysis and zeta potential measurements under different reagents. A microscope was used to observe aggregation state of particles. The hydrophobic agglomeration kinetics of pyrite was studied through the turbidity meter measurement, and the interaction energy between pyrite particles was calculated using the extended-Derjaguin-Landau-Verwey-Overbeek (extended-DLVO) theory. The results showed that the repulsive potential energy is dominant among pyrite particles in aqueous suspensions and that the particles are easy to disperse. Flotation reagents can effectively reduce the repulsive energy between pyrite particles and increase the attraction energy between particles, which is conducive to the hydrophobic agglomeration of fine pyrite. Reagent molecules can greatly reduce the electrostatic repulsion potential energy of the pyrite particles’ interface, increase the hydrophobic attraction potential energy between the particle interfaces, and its size is 2 orders of magnitude larger than the van der Waals attraction potential energy, which is the main reason for induced the agglomeration of fine pyrite and is conducive to the flotation recovery of fine pyrite. Generally, the order in which the reduction of pyrite agglomeration was affected by the additions of flotation reagents was butyl xanthate > terpineol > copper sulfate.

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Section: Supplementary Materialsmentioning

confidence: 99%

Hydrophobic Agglomeration of Fine Pyrite Particles Induced by Flotation Reagents

et al. 2020

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“…One of the most comprehensive pieces of evidence for the dolomite aggregation mechanism is the analysis of RL’s ability to hydrophobise the surface. Several methods are available to determine the influence of adsorbed surfactant on the wettability of the mineral surface, including measuring the contact angle by the sessile drop method [ 68 , 69 ]. In our system, the best correlation between surface wettability and turbidimetric measurements of suspension stability was obtained using the captive bubble method to measure the contact angle.…”

Section: Resultsmentioning

confidence: 99%

“…This method represents conditions closer to those in aqueous solution, where the mineral surface is immersed in liquid, than the sessile drop technique where a water drop is placed on a dry sample. In general, surface hydrophobicity studies provide much important information on the dispersion system and are crucial to predicting its stability [ 69 ].…”

Section: Resultsmentioning

confidence: 99%

Rhamnolipids as Effective Green Agents in the Destabilisation of Dolomite Suspension

Legawiec

Kruszelnicki

Bastrzyk

et al. 2021

IJMS

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In this paper, we describe an application of mono- and dirhamnolipid homologue mixtures of a biosurfactant as a green agent for destabilisation of a dolomite suspension. Properties of the biosurfactant solution were characterised using surface tension and aggregate measurements to prove aggregation of rhamnolipids at concentrations much lower than the critical micelle concentration. Based on this information, the adsorption process of biosurfactant molecules on the surface of the carbonate mineral dolomite was investigated, and the adsorption mechanism was proposed. The stability of the dolomite suspension after rhamnolipid adsorption was investigated by turbidimetry. The critical concentration of rhamnolipid at which destabilisation of the suspension occurred most effectively was found to be 50 mg·dm−3. By analysing backscattering profiles, solid-phase migration velocities were calculated. With different amounts of biomolecules, this parameter can be modified from 6.66 to 20.29 mm·h−1. Our study indicates that the dolomite suspension is destabilised by hydrophobic coagulation, which was proved by examining the wetting angle of the mineral surface using the captive bubble technique. The relatively low amount of biosurfactant used to destabilise the system indicates the potential application of this technology for water treatment or modification of the hydrophobicity of mineral surfaces in mineral engineering.

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“…In fact, the wider the CA is, the lower the surface tension is, and the more water-repellent the surface proves to be. The increased hydrophobicity of specimens came from the dual effect of (1) nonpolar chemical groups of the coating, which reduced the surface energy of samples, and (2) surface roughness, which enhanced the water repellency according to the Wenzel model [26].…”

Section: Contact Angle Analysis and Surface Energy Calculationmentioning

confidence: 99%

Time-Course Study of the Antibacterial Activity of an Amorphous SiOxCyHz Coating Certified for Food Contact

et al. 2021

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One of the most-used food contact materials is stainless steel (AISI 304L or AISI 316L), owing to its high mechanical strength, cleanability, and corrosion resistance. However, due to the presence of minimal crevices, stainless-steel is subject to microbial contamination with consequent significant reverb on health and industry costs due to the lack of effective reliability of sanitizing agents and procedures. In this study, we evaluated the noncytotoxic effect of an amorphous SiOxCyHz coating deposited on stainless-steel disks and performed a time-course evaluation for four Gram-negative bacteria and four Gram-positive bacteria. A low cytotoxicity of the SiOxCyHz coating was observed; moreover, except for some samples, a five-logarithm decrease was visible after 1 h on coated surfaces without any sanitizing treatment and inoculated with Gram-negative and Gram-positive bacteria. Conversely, a complete bacterial removal was observed after 30 s–1 min application of alcohol and already after 15 s under UVC irradiation against both bacterial groups. Moreover, coating deposition changed the wetting behaviors of treated samples, with contact angles increasing from 90.25° to 113.73°, realizing a transformation from hydrophilicity to hydrophobicity, with tremendous repercussions in various technological applications, including the food industry.

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Insight into the Influence of Surface Roughness on the Wettability of Apatite and Dolomite

Cited by 41 publications

References 47 publications

Hydrophobic Agglomeration of Fine Pyrite Particles Induced by Flotation Reagents

Hydrophobic Agglomeration of Fine Pyrite Particles Induced by Flotation Reagents

Rhamnolipids as Effective Green Agents in the Destabilisation of Dolomite Suspension

Time-Course Study of the Antibacterial Activity of an Amorphous SiOxCyHz Coating Certified for Food Contact

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