Increasing coal quality by oil agglomeration after ultrasonic treatment

Şahinoğlu, Ercan; Uslu, T.

doi:10.1016/j.fuproc.2013.07.016

Cited by 34 publications

(6 citation statements)

References 25 publications

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“…Mi and Kang reported coal desulphurization under the effect of microwave alone and also in combination with ultrasound. Sahinoglu and Uslu investigated on oil agglomeration technique using ultrasonic treatment and reported pyritic sulfur and ash reduction with increased gross calorific value (GCV) and combustible recovery. Saikia et al investigated on the cleaning of high-sulfur coal in water and mixed alkali media (1:1 KOH and NaOH) at a low-energy frequency (20 kHz) and reported a reduction on ash, pyritic sulfur, sulfate sulfur, and total sulfur with 87.52%, 83.92%, 12.50%, and 18.80%, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…According to the definition of sonic science, ultrasound is a sound wave with a frequency (above 20 kHz) higher than the audible limit of human hearing . The research based on the application of ultrasound in the cleaning of coal has gained an immense interest these days because of its effectiveness in the demineralization and desulphurization process. − The practice of ultrasound-based coal cleaning already exists in overseas power plants. ,− However, despite having plenty of high-ash and -sulfur coal, the commercialization of such advancement is not established in India. Some of the advantages of ultrasound-based chemical leaching of coal over conventional methods are the high degree of demineralization, fewer reagents, smaller energy consumption, and shorter treatment time …”

Section: Introductionmentioning

confidence: 99%

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Chemical Beneficiation of High-Ash Indian Noncoking Coal by Alkali Leaching under Low-Frequency Ultrasonication

et al. 2018

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Coal mined from the Talcher region of Odisha, India is known to be high-ash, surface-oxidized, and noncoking in nature. It is quite challenging to beneficiate such low-grade coal by physical or physicochemical processes due to its oxidized nature and the presence of complex ash forming mineral matter in its matrix. Chemical beneficiation is one of the alternative process to such problems. However, this chemical process consumes more chemicals, treatment time, and energy, which limits its application further. Therefore, an attempt has been made to chemically beneficiate this coal cost-effectively with optimum chemicals, treatment time, and energy. In the present study, an application of ultrasound at low frequency on alkali-acid leaching is employed to investigate on the demineralization of high-ash Indian noncoking coal. The raw coal properties such as fixed carbon content, CHNS content, Hardgrove grindability index, ash fusion temperature, and gross calorific value (GCV) were investigated before the experiments. The coal samples were leached with three different types of alkali namely, NaOH, KOH, and Na2CO3 followed by H2SO4 and HCl treatment, respectively. The quality of the treated coal was examined by proximate analysis and GCV measurement. The maximum ash removal was achieved on NaOH-leached coal followed by 30% H2SO4 treatment with 73.91% demineralization and 57.21% fixed carbon. The raw and treated coal samples were characterized by Fourier transform infrared, scanning electron microscopy, and X-ray diffraction to confirm the presence of oxygenated functional groups causing surface oxidation, surface modification by ultrasonication, and the formation of alkali aluminosilicates on the coal surface, respectively. The presence of trace elements in the alkali leachates released during ultrasonication was also determined by the inductively coupled plasma atomic emission spectroscopy technique.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chemical Beneficiation of High-Ash Indian Noncoking Coal by Alkali Leaching under Low-Frequency Ultrasonication

et al. 2018

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“…The fraction with >500 μm particles consisted of the coarse particles with medium ash content, denoted as middlings. The yield of concentrates γ C (%) and AR are calculated by using Eqs and , γ normalC ( % ) = m normalC m normalF × 100 % normalA normalR ( % ) = 100 − normalA normals normalh .25em normalr normale normalc normalo normalv normale normalr normaly ( % ) .25em i normaln .25em normalc normalo normaln normalc normale normaln normalt normalr normala normalt normale normals = 100 − γ normalC • A normalC A normalF where, m C , m F , A C , and A F represent the concentrates mass ( g ), the feed weight ( g ), the ash content of the concentrates (%), and the feed ash content (%), respectively.…”

Section: Methodsmentioning

confidence: 99%

Enrichment of Residual Carbon in Coal Gasification Fine Slag via Wet Sieving Separation with Ultrasonic Pretreatment

Sun

Liu

et al. 2022

ACS Omega

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To overcome the environmental and economic challenges posed by the increasing amounts of the coal gasification slag, here, a simple and efficient method for enriching the residual carbon from the coal gasification fine slag was proposed. The residual carbon enrichment pattern in the particle size distribution of coal gasification fine slags after the ultrasonic pretreatment was mainly enriched toward the 500–250 μm and 250–125 μm particle size classes by analyzing the changes in the particle size distribution and apparent morphology. The pulp pretreatment at the ultrasonic output power of 270 W for 4 min was determined as the optimal experimental condition with respect to the yield, ash content, and ash rejection of the concentrates. Compared to the conventional wet sieving separation, the yield and ash content of the final concentrates were reduced by 7.99 and 14.96%, respectively. Moreover, the ash rejection of the final concentrates was as high as 88.51%, indicating an increment of 11.63% than the conventional wet sieving separation. Furthermore, thermogravimetric analysis confirmed that the final concentrates exhibited the lowest reactivity; however, these demonstrated had the highest carbon content (nearly 70%) with 27.27% ash content. The combustion characteristics analysis showed that the wet screening concentrate after ultrasonic pretreatment had the highest composite combustion characteristic index (S) of 3.17 × 10–8, as compared to the raw and conventional sieving concentrates.

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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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Increasing coal quality by oil agglomeration after ultrasonic treatment

Cited by 34 publications

References 25 publications

Chemical Beneficiation of High-Ash Indian Noncoking Coal by Alkali Leaching under Low-Frequency Ultrasonication

Chemical Beneficiation of High-Ash Indian Noncoking Coal by Alkali Leaching under Low-Frequency Ultrasonication

Enrichment of Residual Carbon in Coal Gasification Fine Slag via Wet Sieving Separation with Ultrasonic Pretreatment

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

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