Desulfurization of Tabas coal with microwave irradiation/peroxyacetic acid washing at 25, 55 and 85°C

“…Pyrrhotine (Fe 1-x S) and troilite (FeS) can be removed by acid washing, since they are soluble in acid (Jorjani et al 2004;Zhao et al 2011). And pyrrhotite is a highly magnetic mineral which can be easily removed from the coal via a low intensity magnetic separation .…”

Section: Thermal Effectmentioning

confidence: 99%

“…At the same time, such pyrolytic reactions happened to the organic sulfur in coal (Zavitsanos and Blriler 1978;Jorjani et al 2004). …”

Section: Thermal Effectmentioning

confidence: 99%

Progress of the technique of coal microwave desulfurization

Tao

Xie

et al. 2014

Int J Coal Sci Technol

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With the advantages of its fast speed, effective and moderate controllable conditions, desulfurization of coal by microwave has become research focus in the field of clean coal technology. Coal is a homogeneous mixture which consists of various components with different dielectric properties, so their abilities to absorb microwaves are different, and the sulfur-containing components are better absorbers of microwave, which makes them can be selectively heated and reacted under microwave irradiation. There still remain controversies on the principle of microwave desulfurization at present, thermal effects or non-thermal effects. The point of thermal effects of microwave is mainly base on its characters of rapidly and selectly heating. While, in view of non-thermal effect, direct interactions between the microwave electromagnetic field and sulfur containing components are proposed. It is a fundamental problem to determine the dielectric properties of coal and the sulfur-containing components to reveal the interaction of microwave and sulfur-containing compounds. However, the test of dielectric property of coal is affected by many factors, which makes it difficult to measure dielectric properties accurately. In order to achieve better desulfurization effect, the researchers employ methods of adding chemical additives such as acid, alkali, oxidant, reductant, or changing the reaction atmosphere, or combining with other methods such as magnetic separation, ultrasonic and microorganism. Researchers in this field have also put forward several processes, and have obtained a number of patents. Obscurity of microwave desulfurization mechanism, uncertainties in qualitative and quantitative analysis of sulfur-containing functional groups in coal, and the lack of special microwave equipment have limited further development of microwave desulfurization technology.

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“…Indeed, in literature a positive effect of the microwave irradiation was reported on coal desulfurization [20]. We also tried to find out why by answering the question: "whether microwave irradiation can cause changes in sulfur functionalities into more simple forms with lower bonding energy?…”

Section: Introductionmentioning

confidence: 99%

“…There are several techniques to reach these aims such as X-ray techniques and thermal degradation of coal sample [17][18][19]. Positive influences of microwave irradiation have been reported [20] in view of the optimization of sulfur leaching process by an in advance different irradiation treatments.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of microwave treatment on coal structure and sulfur species by reductive pyrolysis-mass spectrometry method

Mesroghli

Yperman

Jorjani

et al. 2015

Fuel Processing Technology

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Desulfurization of Tabas coal with microwave irradiation/peroxyacetic acid washing at 25, 55 and 85°C

Cited by 62 publications

References 14 publications

Biodegradation of dibenzothiophene and its application in the production of clean coal

Biodegradation of dibenzothiophene and its application in the production of clean coal

Progress of the technique of coal microwave desulfurization

Evaluation of microwave treatment on coal structure and sulfur species by reductive pyrolysis-mass spectrometry method

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