Interaction between physical and chemical variables in the flotation of low rank coals

Polat, Hürriyet; Chander, S.

doi:10.1007/bf03402785

Cited by 5 publications

(5 citation statements)

References 7 publications

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“…Additionally, the non-ionic reagent adsorption usually has a significant effect on the zeta potential of fine low rank coals [95]. Polat and Chander [96] indicated that the addition of surfactants could decrease the required amount of oily collectors and promote the emulsification of oily collectors during low rank coal flotation. A proper conditioning process prior to flotation was important due to the interaction time between surfactants and coal surface was required.…”

Section: Flotationmentioning

confidence: 99%

Recent advances in beneficiation for low rank coals

2015

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Section: Flotationmentioning

confidence: 99%

Recent advances in beneficiation for low rank coals

2015

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“…Block copolymers can be selectively adsorbed at hydrophobic and hydrophilic sites. Polat et al [ 24 ] believed that the addition of surfactants could effectively reduce the amount of conventional oil collectors. Jia et al [ 25 ] studied the effect of a series of tetrahydrofurfuryl esters on the flotation of low-rank coal, and concluded that tetrahydrofurfuryl ester collectors could bond with oxygen-containing functional groups and benzene rings on the surface of low-rank coal, with stronger hydrogen and π bonding.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Adhesion between Fatty Acid Collectors and Hydrophilic Surfaces: Implications for Low-Rank Coal Flotation

Xia

Fang

et al. 2022

Molecules

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Fatty acids, which are enriched in vegetable oil, have attracted much attention in low-rank coal flotation because of their unique chemical structure. In this study, density functional theory calculations, molecular dynamics simulations, and atomic force microscopy were employed to investigate the adsorption structure and forces between collectors and hydrophilic surfaces. The results show that fatty acids can be easily adsorbed onto surfaces through hydrogen bonds, and can cover the oxygen sites. The existence of hydration film on hydrophilic surfaces prevented nonpolar molecules from being able to adsorb, while polar fatty acids could adsorb and expel water molecules. The adhesion force between the RCOOH-terminated probe and the surface appeared in the retraction process, which differed significantly from that of the RCH3-terminated probe, indicating that polar fatty acids are more suitable as flotation collectors for low-rank coal than nonpolar hydrocarbon oil. The simulation and AFM test revealed the mechanisms of polar fatty acids, and can provide guidance for low-rank coal flotation applications.

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“…To solve this problem, mixed collectors or compound reagents have been widely used to improve flotation performance. It was demonstrated that the addition of ionic or nonionic surfactant can enhance the hydrocarbon oil adsorption and increase the hydrophobicity of low-rank coal [20][21][22]. Jena et al [23] conducted low coal flotation using waste black oil as a collector, which contained a mixture of different oxygen-containing groups.…”

Section: Introductionmentioning

confidence: 99%

Effect of Dodecane-Oleic Acid Collector Mixture on the Evolution of Wetting Film between Air Bubble and Low-Rank Coal

Liao

Song

et al. 2021

Minerals

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The wetting film evolution process is essential for flotation, especially in bubble–particle attachment. A mixed collector has been proved effective in promoting flotation. In this paper, the effect of a mixed collector (MC) composed by n-dodecane (D) and oleic acid (OA) on wetting film evolution was investigated using the extended Derjagin–Landau–Verwey–Overbeek (EDLVO) theory, the Stefan–Reynolds model, induction time, and zeta potential measurement. The hydrophobic force constant between bubble and coal treated by different collectors was analyzed. The results showed that MC was superior in reducing the induction time and increasing the zeta potential. When bubbles interacted with coal treated by MC, they had relatively low interaction energy, high critical film thickness, and high drainage rate. The order of hydrophobic force constant was no reagent < D < OA < MC. It indicated that the hydrophobic interaction between bubbles and coal particles treated by MC was the strongest because of the synergistic effect of D and OA.

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Interaction between physical and chemical variables in the flotation of low rank coals

Cited by 5 publications

References 7 publications

Recent advances in beneficiation for low rank coals

Recent advances in beneficiation for low rank coals

Interfacial Adhesion between Fatty Acid Collectors and Hydrophilic Surfaces: Implications for Low-Rank Coal Flotation

Effect of Dodecane-Oleic Acid Collector Mixture on the Evolution of Wetting Film between Air Bubble and Low-Rank Coal

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