Features of the concentration dependences of the surface tension of water suspensions of bentonites

Dadashev, R. Kh.; Dzhambulatov, R. S.; Elimkhanov, D. Z.

doi:10.1134/s0036024415080075

Cited by 8 publications

(6 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to the literature, the appearance of the silt particles first causes the decrease in the surface tension–to the minimum. The increase in the concentration of the particles in the suspension results in the following increase in surface tension, up to the value similar to that of pure water [ 60 , 61 ].…”

Section: Discussionmentioning

confidence: 99%

The differences in crown formation during the splash on the thin water layers formed on the saturated soil surface and model surface

et al. 2017

View full text Add to dashboard Cite

Splash is the first stage of a negative phenomenon–soil erosion. The aim of this work was to describe the crown formation quantitatively (as part of the splash erosion) and compare the course of this phenomenon on the thin water film formed on a smooth glass surface and on the surface of saturated soil. The height of the falling water drop was 1.5 m. The observation of the crowns was carried out by high-speed cameras. The static and dynamic parameters of crown formation were analysed. It was found that the crowns formed on the water film covering the saturated soil surface were smaller and the time intervals of their existence were shorter. In addition, the shapes of the crowns were different from those created on the water layer covering the glass surface. These differences can be explained by the slightly different values of surface tension and viscosity of the soil solution, the greater roughness of the soil surface and the lower thickness of the water film on the soil surface.

show abstract

Section: Discussionmentioning

confidence: 99%

The differences in crown formation during the splash on the thin water layers formed on the saturated soil surface and model surface

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Then, it slowly increases with increasing kaolinite content. According to a previous study, Dadashev et al (2015) found that the surface tension of a bentonite suspension system showed a minimum between 3% and 5% of bentonite solids. Similarly, in this paper, a similar phenomenon was found with the ultrafine kaolinite particles that were used as the research object.…”

Section: Pulpmentioning

confidence: 93%

“…According to a test method mentioned in previous studies (Dadashev et al 2015;Zhou and Dong 2016), the surface tension tests were performed using the Wilhelmy Hoist method. The surface tension of the ultrafine kaolinite suspension was measured with a surface tensiometer (Kruss K100, Germany).…”

Section: Surface Tension and Froth Layer Properties Testsmentioning

confidence: 99%

Effect of ultrafine kaolinite particles on the flotation behavior of coking coal

Xia

Peng

et al. 2020

Int J Coal Sci Technol

View full text Add to dashboard Cite

Kaolinite, as a mineral in fine coal, has an important influence on the flotation of coal particles. In this study, the effects of ultrafine kaolinite particles on the flotation recovery of coal particles were investigated. Flotation tests were carried out using a mixture of coal particles and different amounts of ultrafine kaolinite particles. Combined with the Stefan-Reynold theory, the effect of liquid film drainage rate between coal bubbles in a kaolinite suspension was calculated. The yield of flotation clean coal increases quickly with the increasing content of ultrafine kaolinite particles. The ultrafine kaolinite particles can reduce the surface tension of the suspension, weaken the bubble coalescence, and stabilize the structure of the froth layer. In addition, the ultrafine kaolinite particles increase the apparent viscosity of the flotation pulp slightly. It is concluded that the role of ultrafine kaolinite particles on the positive effect of froth properties conceals the negative effect on the liquid film drainage rate between coal particles and bubbles caused by the kaolinite particles, which ultimately leads to an increasing yield of clean coal with an increasing content of kaolinite particles. This study is important for understanding the influence of ultrafine kaolinite on coal particle flotation.

show abstract

“…Therefore, after a drying process, the height of the specimen is greater than 20.0 mm (initial height), and the radial size of the specimen is less than 61.8 mm. Based on previous studies, the authors think that during the process of drying, pores are contracted after the water is discharged, and contraction stress on the pore is applied because of the surface tension of water, which intensifies the shrinkage of the pore (Dadashev & Dzhambulatov, 2015). Moreover, since some non-recoverable displacement is destined to occur in the drying process, the vertical swelling capacity of the specimen is greater than that of the radial after the first cycle ( Komine & Ogata, 1994;Steiner, 1993).…”

Section: Swelling Under Different Drying-wetting Cyclesmentioning

confidence: 99%

Swelling Research of Expansive Soil Under Drying-Wetting Cycles: A NMR Method

Wei¹,

Dong²

2020

S&R

View full text Add to dashboard Cite

The main purpose of this study is to examine the influence of drying-wetting cycles on the swelling of disturbed expansive soil at the micro-scale. Swelling curve -the relationship between swelling displacement and water-absorbing time -is measured based on specimens that experienced 0-4 drying-wetting cycles. Assisted by Nuclear Magnetic Resonance (NMR), the stage characteristic and mechanism influencing swelling curve are analyzed from a pore-change perspective. Specimens that experienced 1-4 cycles show a higher swelling rate when compared with the specimens without drying-wetting cycles; the swelling rates of each swelling curve are found to decrease with an increasing water-absorbing time. These swelling curves are divided into rapid-swelling stage, slow-swelling stage, and slow-stable stage, where three straight lines are used to fit these stages to each curve. The swelling displacement of the specimen increases after the first cycle, whereas it decreases gradually during the following cycles. Changes of pore structure at each stage are considered to be the main factor affecting the swelling rate during the saturating process. Some fine particles and water-soluble cements are lost after multiple cycles, and some smaller pores are converted into larger pores, resulting in an increase in volume and a decrease of swelling displacement. Moreover, the increase of larger pores and the suction difference after various cycles are important factors leading to the difference of the swelling curve and the swelling displacement.

show abstract

Features of the concentration dependences of the surface tension of water suspensions of bentonites

Cited by 8 publications

References 1 publication

The differences in crown formation during the splash on the thin water layers formed on the saturated soil surface and model surface

The differences in crown formation during the splash on the thin water layers formed on the saturated soil surface and model surface

Effect of ultrafine kaolinite particles on the flotation behavior of coking coal

Swelling Research of Expansive Soil Under Drying-Wetting Cycles: A NMR Method

Contact Info

Product

Resources

About