Hydrophobicity of talc basal surface

Tarasevich, Yu. I.; Aksenenko, E. V.

doi:10.1134/s1061933x14040140

Cited by 10 publications

(4 citation statements)

References 8 publications

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“…The abrasiveness of quartz causes higher friction between particles and consequently higher SDS foaming (Kulu et al, 2009; West, 1986). While talc is a hydrophobic soft mineral and it is considered a lubricant material (Abdulkareem et al, 2010; Ribet et al, 2003; Tarasevich & Aksenenko, 2014; Yi et al, 2018).…”

Section: Resultsmentioning

confidence: 99%

Foam in grinding and role of ground mineral in its stability

El‐Midany,

Farag

2023

J Surfact & Detergents

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Surfactants are usually used as grinding aids. However, surfactant foaming during the grinding process is rarely mentioned in the literature with no clarification of its effect on the grinding process. In this paper, the generation of foam during the grinding of talc and quartz, as two different minerals in their hardness and hydrophobicity, was observed in the presence of sodium dodecyl sulfonate (SDS). The effect of generated foam on the fineness of ground product under different grinding conditions such as solids%, grinding time, and pulp pH was investigated. The results indicated that the foam was formed during the grinding of both minerals. The foam volume depends not only on the presence of surfactant but also on the characteristics of the mineral along with grinding conditions. The foam was intense and more stable particularly at pH 10 and high solid content (i.e., 60% solids) in the case of talc due to its fineness and hydrophobicity that result in bubbles stabilization. Remarkably, there is no foam at acidic pH due to the high ionic strength that leads to bubble instability. Most importantly, the presence of surfactant foams improves the size reduction process by providing more dispersion of particles, as one of the grinding aid mechanisms, due to particle‐particle and particle‐SDS repulsive electrostatic forces.

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Section: Resultsmentioning

confidence: 99%

Foam in grinding and role of ground mineral in its stability

El‐Midany,

Farag

2023

J Surfact & Detergents

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“…The lubricationapproximation [18] may be used as one of the possible ways to incorporate these effects into our consideration. This approach has been successfully applied to desiccated colloidal droplets with axial symmetry [8,11,19]. In further studies, the speculative evaporative flux (2) should be replaced with a calculated one.…”

Section: Resultsmentioning

confidence: 99%

“…In fact, this pattern formation is a kind of well-known coffee-ring effect [4]. Our model is based on the use of an advection-diffusion equation [5,6,7,8,9].…”

Section: Introductionmentioning

confidence: 99%

Mass transfer during drying of colloidal film beneath a patterned mask that contains a hexagonal array of holes

Tarasevich

Vodolazskaya

2016

J. Phys.: Conf. Ser.

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We simulated an experiment in which a thin colloidal sessile droplet is allowed to dry out on a horizontal hydrophilic surface when a mask just above the droplet predominantly allows evaporation from the droplet free surface directly beneath the holes in the mask [Harris D J, Hu H, Conrad J C and Lewis J A 2007 Phys. Rev. Lett. 98 148301]. We considered one particular case when centre-to-centre spacing between the holes is much less than the drop diameter. In our model, advection, diffusion, and sedimentation were taken into account. FlexPDE was utilized to solve an advection-diffusion equation using the finite element method. The simulation demonstrated that the colloidal particles accumulate below the holes as the solvent evaporates. Diffusion can reduce this accumulation.

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“…Talc is typically hydrophobic [46,47], and the interaction of scCO2, which is non-polar, with this mineral may have facilitated its attack, as observed in Table 6. It is seen that for…”

Section: Ergo Plant Tailings Samplementioning

confidence: 99%

Selection of a suitable ligand for the supercritical extraction of gold from a low-grade refractory tailing

Dyk

Mawire

Potgieter

et al. 2022

The Journal of Supercritical Fluids

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Reprocessing tailings for gold recovery is generating new low-grade refractory secondary tailings. Unlocking gold trapped within these secondary tailings potentially holds additional economic value. In this study, the use of supercritical carbon dioxide (scCO2) at 100 bar and 40 °C for gold extraction from such a secondary gold tailings sample (0.27 g/t) was investigated. The research identified and screened the following ligands as suitable extractants for gold in scCO2, i.e. 3-(trifluoromethyl)-phenyl-thiourea (TPT), 1,1,1-trifluoro-2,4pentanedione (TFA), betaine bis(trifluoromethylsulfonyl)imide ([Hbet][TF2N]), 4-methyl-4H-1,2,4-triazole-3-thiol (MHTT) and hexafluoroacetylacetone (HFA). Results from screening experiments showed that extraction of gold for all ligands in the presence of a tri-n-butyl phosphate-nitric acid adduct (TBP-HNO3) as oxidant exceeded 50% after 18 h, with the highest extraction offered by [Hbet][TF2N] (82% after 24 h). A comparative study, where no scCO2 was present, showed that the presence of scCO2 offered a distinct advantage in extraction.

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Hydrophobicity of talc basal surface

Cited by 10 publications

References 8 publications

Foam in grinding and role of ground mineral in its stability

Foam in grinding and role of ground mineral in its stability

Mass transfer during drying of colloidal film beneath a patterned mask that contains a hexagonal array of holes

Selection of a suitable ligand for the supercritical extraction of gold from a low-grade refractory tailing

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