Effect of Oleic Acid on Froth Properties and Reverse Flotation Performance of Thermal Coal

Shen, Liang; Liu, Lingyun; Zhu, Jinbo; Qiao, Erle

doi:10.1007/s12666-018-1342-8

Cited by 7 publications

(2 citation statements)

References 24 publications

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“…The drainage process is accelerated because of the high concentration of OA spreading from coal surface and wetting film into the medium and then entraining water from the film [46]. However, in the flotation process, OA in high concentration can adsorb to coal and gangue at the same time [47], and lose the selectivity.…”

Section: Back Calculation Of Hydrophobic Force Constantmentioning

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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Section: Back Calculation Of Hydrophobic Force Constantmentioning

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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“…Flotation is an effective way to upgrade coal slime [7][8][9][10][11][12]. However, due to the high oxygencontaining functional groups and pores on the surface of LRC, the surface is highly hydrophilic and difficult to upgrade using conventional flotation method [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Improving Coal Flotation by Gaseous Collector Pretreatment Method and its Potential Application in Preparing Coal Water Slurry

et al. 2019

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Low-rank coal is difficult to upgrade using conventional flotation methods due to its high hydrophilic properties. Thus, it is necessary to explore new methods for upgrading and utilizing low-rank coal. In this investigation, a gaseous dodecane pretreatment method was used to enhance the flotation performance of low-rank coal. Pore distribution analysis, FTIR (Fourier Transform Infrared Spectroscopy), and contact angle measurements were used to study the surface properties of the coal sample. Size distribution and float-sink test results indicated that the coal sample contained a lot of clean coal with low ash content, which could be used as a high quality raw material for making coal water slurry. FTIR, pore distribution analysis, and contact angle results showed that the coal was very hydrophilic due to the high concentration of -OH group and the large number of pores and cracks on the coal surface. The hydrophobicity of the coal sample was significantly improved by the gaseous dodecane pretreatment method. Clean coal with 67.2% combustible matter recovery and 10.5% ash content was obtained by gaseous dodecane pretreatment flotation method. Coal water slurry with 60% concentration was prepared using the flotation clean coal.

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Reduction of the slime contamination on fine coking coal by using the reverse-and-direct flotation process

Zhu

Yin

Yang

et al. 2019

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Effect of Oleic Acid on Froth Properties and Reverse Flotation Performance of Thermal Coal

Cited by 7 publications

References 24 publications

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

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

Improving Coal Flotation by Gaseous Collector Pretreatment Method and its Potential Application in Preparing Coal Water Slurry

Reduction of the slime contamination on fine coking coal by using the reverse-and-direct flotation process

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