Collecting behaviors of high internal phase (HIP) emulsion in flotation of ultrafine high-ash content coal slime

Zhao, Xinbing; Tang, Yunmin; Zhao, Binglong; Wu, Changning; Li, Junguo; Chu, Chih‐Peng; Liu, Ke; Ding, Yulong

doi:10.1080/19392699.2020.1870221

Cited by 16 publications

(5 citation statements)

References 32 publications

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“…Ultrapure water was used for sample dispersion. 8 To correspond to the dosage of reagent and solid content in the flotation test, the 0.14 g/mL coal slurry with 7 mg/L PVP solution was stirred at a rotation speed of 600 r/min and prepared as the test sample. The sample was injected into the LPSA with a microsyringe and was subjected to constant agitation in the LPSA channel.…”

Section: Experimental Sectionmentioning

confidence: 99%

“…For measuring the optical parameter, the real and imaginary part of the medium refractive index values were set to 1.8 and 0.8, respectively. Ultrapure water was used for sample dispersion . To correspond to the dosage of reagent and solid content in the flotation test, the 0.14 g/mL coal slurry with 7 mg/L PVP solution was stirred at a rotation speed of 600 r/min and prepared as the test sample.…”

Section: Experimental Sectionmentioning

confidence: 99%

“… 7 Ultrafine particle size is also an important factor constraining the floatability of low-rank coal. 8 − 10 As a rule, surface regulation methods are customarily employed for the betterment of low-rank coal flotation performance. 2 Surface regulation is typically achieved with the aid of surfactants and regulators, which have attained noticeable industrial applications lately.…”

Section: Introductionmentioning

confidence: 99%

“…When applied in low-rank coal reprocessing, separation performance deteriorates due to the inherent characteristics of low-rank coal: high surface roughness and oxygen content . Ultrafine particle size is also an important factor constraining the floatability of low-rank coal. − As a rule, surface regulation methods are customarily employed for the betterment of low-rank coal flotation performance . Surface regulation is typically achieved with the aid of surfactants and regulators, which have attained noticeable industrial applications lately …”

Section: Introductionmentioning

confidence: 99%

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Understanding the Role of Polyvinylpyrrolidone on Ultrafine Low-Rank Coal Flotation

et al. 2022

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Effective regulation reagents are essential in low-rank coal flotation for improving the floatability of ultrafine particles. Polymer regulators have great potential in the surface modification of ultrafine coal particles. A novel nonionic polymer, polyvinylpyrrolidone (PVP), is evaluated in this study to determine its effectiveness as a regulator in floating ultrafine low-rank coal. Laser particle size analysis is used to discern both the size distribution of coal particles and the change in size distribution. Contact angle tests are carried out to evaluate the wettability of low-rank coal. Surface functional groups of low-rank coal are analyzed by Fourier transform infrared spectroscopy, and the surface interaction energy is tested by X-ray photoelectron spectroscopy. The results show effective adsorption of PVP and demonstrate the effects of PVP at the coal surface. The adsorption of PVP changes the proportion of exposed carbon and oxygen-containing functional groups on the surface of low-rank coal, regulating the size distribution of low-rank coal particles in suspension. The success of polyvinylpyrrolidone as a regulator in low-rank coal flotation is demonstrated, and the mechanisms by which PVP can affect ultrafine low-rank coal flotation are elucidated.

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Section: Experimental Sectionmentioning

confidence: 99%

Section: Experimental Sectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Understanding the Role of Polyvinylpyrrolidone on Ultrafine Low-Rank Coal Flotation

et al. 2022

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“…Many studies have pointed out that inorganic phosphate can disperse silicate minerals, carbonate minerals, and oxide minerals, which is believed to be because the addition of inorganic phosphates can increase the electrostatic repulsion and steric hindrance between minerals [19][20][21][22]. Theoretically, this dispersion can peel off and disperse the fine gangue that adheres to the surface of coal particles, strengthening the recovery of coal particles, and thereby reducing the ash content of clean coal and enhancing flotation selectivity.…”

Section: Introductionmentioning

confidence: 99%

Research on Mechanisms of Improving Flotation Selectivity of Coal Slime by Adding Sodium Polyphosphate

Wang

Zhao

et al. 2022

Minerals

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A high percentage of high-ash fine slime materials can deteriorate flotation selectivity through surface covering. This covering of the surface is one of the issues that need to be addressed for efficient flotation processing of difficult-to-separate and high-ash coals. In this study, we investigated the depression effect of SPP on high-ash fine mud by flotation kinetic tests. We also revealed the mechanism of SPP depression of fine slime flotation and enhanced flotation selectivity of difficult-to-separate and high-ash coals by means of Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), and Atomic Force Microscopy (AFM) analyses. The results showed that under the best condition of SPP dosage, clean coal with 9.75% ash content and 76.76% yield was obtained. Compared to the blank group, the ash content of the clean coal decreased by 2.39%, while the yield was only reduced by 2.18% in the presence of SPP. The reason for this was that the addition of SPP enhanced the stripping and dispersion of the gangue from the coal particle surface. The result was a reduction in the cover of the coal grain surface and an increase in the hydrophobic sites on the coal surface, thereby depressing the non-selective flotation of the gangue and enhancing the adsorption of the collector on the coal surface. The ash content of the flotation concentrate decreased, but the yield remained almost unchanged, which was the main reason for the better performance of SPP as a depressant compared to conventional depressants.

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Aggregates characterizations of the ultra-fine coal particles induced by nanobubbles

Liu

et al. 2021

Fuel

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Collecting behaviors of high internal phase (HIP) emulsion in flotation of ultrafine high-ash content coal slime

Cited by 16 publications

References 32 publications

Understanding the Role of Polyvinylpyrrolidone on Ultrafine Low-Rank Coal Flotation

Understanding the Role of Polyvinylpyrrolidone on Ultrafine Low-Rank Coal Flotation

Research on Mechanisms of Improving Flotation Selectivity of Coal Slime by Adding Sodium Polyphosphate

Aggregates characterizations of the ultra-fine coal particles induced by nanobubbles

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