Physicochemical properties of wastewater produced from the microwave upgrading process of Indonesian lignite

Cheng, Jun; Zhou, Fan; Wang, Xin; Liu, Jianzhong; Wang, Zhihua; Zhou, Junhu; Cen, Kefa

doi:10.1016/j.fuel.2015.05.062

Cited by 13 publications

(5 citation statements)

References 60 publications

(71 reference statements)

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“…The conductivity is mainly affected by the concentration of ions in the LPs. , As illustrated in Table , the electrical conductivity decreased first and then increased with an increasing additive effect. When Na 2 CO 3 was added, the proportional increase in the amount of water removed from the coal sample was greater than the proportional increase in the amount of dissolved ions, which reduced the ionic concentration in the LPs.…”

Section: Resultsmentioning

confidence: 98%

“…As shown in Table , the surface tension of the LPs first increased and then decreased as the rate of dehydration increased. According to ref , the surface tension is affected by the content of ions and organic compounds in the LPs. When the ion content in the LPs increased or the content of organic compounds decreased, the surface tension increased, and vice versa.…”

Section: Resultsmentioning

confidence: 99%

“…As in ref , the coal sample was heated with a microwave frequency of 2450 ± 50 Hz in an industrial microwave oven, with multimode resonant cavity dimensions of 400 × 400 × 420 mm 3 . Two types of microwave experiments were carried out in this study under a microwave power of 800 W.…”

Section: Materials and Experimentsmentioning

confidence: 99%

See 2 more Smart Citations

The Influence of Anionic Additives on the Microwave Dehydration Process of Lignite

Liu

Feng

et al. 2020

Energy Fuels

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Different anionic additives were added to lignite to enhance the effect of microwave heating on the dehydration and upgrading processes. The dehydration kinetics and moisture diffusion coefficient as well as the physical and chemical properties of solid and liquid products were studied in detail. During the microwave heating process, the enhancement effect of each additive was in the order of Na2CO3 < Na2SO4 < NaCl < NaNO3. The dehydration process of lignite was well fitted by the logarithmic model. For the solid products, as the promotion effect on the dehydration process of lignite increased, the structure tended to be stable, the content of harmful gas released by combustion was reduced, and the surface hydrophobicity was enhanced. At the same time, for the liquid products, the total organic carbon, chemical oxygen demand, and electrical conductivity increased, the pH decreased and the surface tension increased first and then decreased. With an increasing additive enhancement effect, moisture loss was supplemented by the loss of inorganics and then organics.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

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The Influence of Anionic Additives on the Microwave Dehydration Process of Lignite

Liu

Feng

et al. 2020

Energy Fuels

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“…Therefore, the moisture within XL could absorb numerous microwave energy in a short time and rapidly evaporate. The moisture removal rate was so fast that the time required to reduce most moisture within XL was remarkably shortened [30]. Moreover, the evaporated moisture within the inner particle was transferred from the internal structure to the external environment by the pressure-driven steam jet flow, thus resulting in the significant physical structure damage of XL.…”

Section: Grindability Testsmentioning

confidence: 99%

Effects of different drying methods on the grinding characteristics of Ximeng lignite

Zhu

Liu

et al. 2015

Fuel

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“…Microwave irradiation (MI) drying is employed as an alternative to conventional convective and conductive heating and has attracted an increasing amount of attention because it offers some unique advantages, such as rapid and selective heating, energy transfer (instead of heat transfer), penetrating deep into sample, and enhancing water loss . Additionally, MI enables various application in coal processing, such as improvements in liquefaction and slurryability, coal pyrolysis, coal conversion to heavy hydrocarbons, and desulfurization .…”

Section: Introductionmentioning

confidence: 99%

Effects of activated carbon on optimization of microwave irradiation upgrading of Loy Yang lignite

Liu

Cheng

Hirajima

et al. 2018

Asia-Pacific J Chem Eng

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To further upgrade Loy Yang lignite via microwave irradiation treatment, activated carbon with different particle size fractions (ACP1, <300 μm or ACP2, 1–1.17 mm) was mixed with lignite. ACP1 was not removed from the upgraded samples (the first type of samples, S1), whereas ACP2 was separated (the second type of samples, S2). All samples were characterized by total acidity, pore size distribution, equilibrium water content (EWC), and combustion characteristics. The results showed that total acidity decreased with increasing ACP1 or ACP2 and total acidity of S1 was higher than that of the corresponding S2. Furthermore, EWCs of the upgraded samples were considerably lower than that of raw lignite. EWC of S1 first increased and then decreased with increasing ACP1 content; this is due to the competition between the obvious increase in pores and decomposition of total acidity. EWC of S2 decreased as ACP2 content increased; this is because of the evident decrease in total acidity. The reactivity for the sample with an 8% addition of ACP1 was the lowest because of the combined effects of the decomposition of total acidity and the maintaining of ACP1, whose reactivity is low.

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Physicochemical properties of wastewater produced from the microwave upgrading process of Indonesian lignite

Cited by 13 publications

References 60 publications

The Influence of Anionic Additives on the Microwave Dehydration Process of Lignite

The Influence of Anionic Additives on the Microwave Dehydration Process of Lignite

Effects of different drying methods on the grinding characteristics of Ximeng lignite

Effects of activated carbon on optimization of microwave irradiation upgrading of Loy Yang lignite

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