The effect of sonic treatment on the flotability of oxidized coal

Buttermore, W.H.; Slomka, B.J.

doi:10.1016/0301-7516(91)90071-p

Cited by 24 publications

(5 citation statements)

References 3 publications

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“…This indicates that ultrasonic pretreatment performed for a short time has a crushing and cleaning effect as a result of the cavitation effect and helps improve the floatability of oxidized coal. This result is consistent with those reported by Buttermore and Slomka . However, it was found that prolonged ultrasonic pretreatment reduced the flotation kinetics, which may be attributed to the reoxidation effect of ultrasonic cavitation.…”

Section: Resultssupporting

confidence: 93%

“…This result is consistent with those reported by Buttermore and Slomka. 26 However, it was found that prolonged ultrasonic pretreatment reduced the flotation kinetics, which may be attributed to the reoxidation effect of ultrasonic cavitation. The yield of the coarse coal particles (0.25−0.074 mm) reduced from 42.92 to 36.17%, while the yield of fine coal particles (−0.074 mm) increased from 57.08 to 63.83% after 20 min of ultrasonic pretreatment.…”

Section: Resultsmentioning

confidence: 99%

“…XPS results indicated that ultrasonic treatment successfully exfoliated the thin clay layer as well as the oxidized layer. 25 Buttermore and Slomka 26 observed that ultrasonic pretreatment can enhance the floatability of oxidized coal to a level close to or exceeding that of fresh coal by removing the oxidized surface layer by cavitation. However, the ultrasonic pretreatment method is a complex process that requires further investigation.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Ultrasonic Pretreatment on Oxidized Coal Flotation

Xu¹,

Xing

Gui³

et al. 2017

Energy Fuels

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In this work, the effect of ultrasonic pretreatment time on oxidized coal flotation was studied. Analytical techniques, such as particle size distribution (PSD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), contact angle measurement, and specific surface area/pore analysis, were used to examine the changes in the physicochemical characteristics of the coal samples before and after ultrasonic pretreatment. The results showed that the flotation kinetics and yield of the clean coal initially increased with ultrasonic pretreatment time. The maximum clean coal yield (79.6%) and maximum value of the flotation kinetics constant were obtained within 10 min of ultrasonic pretreatment. The hydrophilic oxidized layer on the coal surface was effectively removed by ultrasonic cavitation, as identified by PSD, SEM, XPS, and contact angle, which increased the flotability and recovery of oxidized coal. However, prolonged ultrasonic pretreatment proved detrimental to oxidized coal flotation. The fresh exposed surface was reoxidized by the hydroxyl free radicals produced during the cavitation process. It is expected that the results of this work will provide guidance in ultrasonic flotation for oxidized coal.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Ultrasonic Pretreatment on Oxidized Coal Flotation

Xu¹,

Xing

Gui³

et al. 2017

Energy Fuels

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“…Others, such as Celik and Somasundaran (1980), have reported that sonication restores the floatability of coals depressed by contacting with KMnO 4 or SnCl 2 solutions. Likewise, Buttermore and Slomka (1991) have concluded that sonication of the oxidized coals in aqueous slurry restored the floatability to a level near or exceeding that of fresh coal.…”

Section: Introductionmentioning

confidence: 96%

Effect of Preconditioning on the Flotation of Coal

Feng

Aldrich

2005

Chemical Engineering Communications

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Two preconditioning methods, namely, ultrasonication and high-intensity conditioning in an agitated vessel, were compared as a means for improving the flotation of oxidized coal. The use of preconditioning by ultrasound or high-intensity conditioning significantly improved the flotation of the oxidized coal in batch-type laboratory tests, particularly with respect to the flotation rate and the recovery of combustible matter. In addition, the rate and recovery of the smaller size fractions were enhanced considerably. The beneficial effects of preconditioning on the batch flotation of oxidized coal were clearly reflected in smaller bubble size distributions, higher froth loadings, and greater stability of the flotation froths.

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“…Using new generation technologies like ultrasonic waves in the sulfur removal increases the process effi ciency of physical coal cleaning processes and/or ensure equipment savings (Angle et al, 1988;Buttermore and Slomka, 1991;Ambedkar et al, 2011aAmbedkar et al, , 2011bŞahinoğlu and Uslu, 2013). When ultrasonic waves are used in the chemical demineralization and desulfurization processes, they are stated to increase process effi ciency (Baruah and Khare, 2007;Ambedkar et al, 2011aAmbedkar et al, , 2011bSaikia et al, 2014aSaikia et al, , 2014bSaikia et al, , 2016.…”

Section: Introductionmentioning

confidence: 99%

Muğla Yatağan Bağyaka Li̇nyi̇ti̇ni̇n Ultrasoni̇k Dalgalar İle Desülfüri̇zasyon Prosesi̇nde Bazi Parametreleri̇n Opti̇mi̇zasyonu

Sansar¹

2018

Maden Tetkik Ve Arama Dergisi

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In this study, the desulfurization process developed using ultrasonic waves for Muğla Yatağan Bağyaka lignite had the optimum conditions for parameters affecting the ash and sulfur removal potentials determined with the Surface Response Method and a model created. The process parameters to obtain optimum desulfurization and ash removal were chosen as the ultrasonic treatment time, solid content, concentration of chemical reactive (H 2 O 2) and reactive volume, and the optimum values were determined. Using this data with the aid of the Design Export 7.0 program, the regression model was found as a second degree polynomial equation. The coeffi cients of determination (R 2) for desulfurization and ash removal regressions were 0.96 and 0.97, respectively, in the determined model. The model prediction values and experimental results for desulfurization and ash removal in the investigated parameter intervals were compared and the fi t was identifi ed. In the experimental removal of sulfur types with optimum desulfurization it was found that pyritic 17.02%, sulfate 16.67% and organic 9.52%.

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The effect of sonic treatment on the flotability of oxidized coal

Cited by 24 publications

References 3 publications

Effect of Ultrasonic Pretreatment on Oxidized Coal Flotation

Effect of Ultrasonic Pretreatment on Oxidized Coal Flotation

Effect of Preconditioning on the Flotation of Coal

Muğla Yatağan Bağyaka Li̇nyi̇ti̇ni̇n Ultrasoni̇k Dalgalar İle Desülfüri̇zasyon Prosesi̇nde Bazi Parametreleri̇n Opti̇mi̇zasyonu

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