Changes in organic structure and mineral phases transformation of coal during heat treatment on laboratory scale

Mishra, Vivek; Sharma, Mamta; Chakravarty, Sanchita; Banerjee, Amit

doi:10.1007/s40789-016-0153-y

Cited by 23 publications

(14 citation statements)

References 48 publications

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“…The presence of ZnO and CuO was very small in ppm. The presence of these oxides in the coal and bio-coal briquette has been reported in previous studies 39 , 41 – 43 . The presence of these oxides in different ratios serves as indices for different coal ash behaviours such as slagging, fouling, and abrasion.…”

Section: Resultssupporting

confidence: 71%

“…It mainly indicates the presence of Quartz (Q), Mullite (M) and Hematite (H), Kaolinite (K), and Anatase (A), and the lower temperature oxides of titanium (rutile) were also observed in the diffractograms. These peaks in the patterns were identified through the JCPD file and previous studies 39 , 41 . The XRD patterns for all the different hybridization ratios of the bio-coal briquettes were similar.…”

Section: Resultsmentioning

confidence: 99%

“…This could be as a result of low -temperature curing used during the briquetting process. An increase in the curing temperature of the bio-coal briquettes above 400 °C could lead to mineral phase transformations where rutile, kaolinite, among others, may be oxidized to form different oxides 41 . The transformation of various oxides to other forms could pose a major setback leading to inefficient combustion process when bio-coal briquettes are in use.…”

Section: Resultsmentioning

confidence: 99%

“…These oxides ratio is applied to predict coal ash slagging performance 41 , 48 . Good coal must have a high silica ratio 0.78, which implied that it will be hard to fuse 41 . The silica ratio of both raw coal and bio-coal briquette ashes are > 0.81 as presented in Table 4 .…”

Section: Resultsmentioning

confidence: 99%

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Ash analyses of bio-coal briquettes produced using blended binder

Adeleke

Odusote

Ikubanni

et al. 2021

Sci Rep

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The behaviour of ash of fuel affects its thermal efficiency when in use. The ash analyses of bio-coal briquettes developed from lean grade coal and torrefied woody biomass have received limited intensive study. Therefore, the present study aims at analysing the ashes of briquette made from lean grade coal and torrefied woody biomass using blended coal tar pitch and molasses as the binder. Bio-coal briquettes were produced from coal and torrefied biomass in various hybrid ratios. Ashing of various briquettes was done in a muffle furnace at 850 °C for 3 h. Mineral phases of the ash were identified using an X-ray Diffractometer (XRD), while the mineral oxides were obtained using an X-ray Fluorescence Spectrometer. The AFT700 Furnace was used with its AFT700 software to evaluate the ash fusion temperatures of the ashes. The XRD patterns look similar, and quartz was found to be the dominant mineral phase present in the raw coal and bio-coal briquettes. The SiO2 (57–58%), Al2O3 (19–21%), and Fe2O3 (8–9%) were the major oxides observed in the ashes. The final fusion temperatures of the ashes range from 1300–1350 °C. The compositions of the ashes of the bio-coal briquettes are classified as detrital minerals. It was concluded that the addition of torrefied biomass (≤ $$10\%)$$ 10 % ) and blended binder ($$\le $$ ≤ 15%) to coal gave a negligible impact on the ashes of the resultant bio-coal briquettes.

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Section: Resultssupporting

confidence: 71%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Ash analyses of bio-coal briquettes produced using blended binder

Adeleke

Odusote

Ikubanni

et al. 2021

Sci Rep

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“…In contrast, centrifugal extractor has many advantages, such as compact structure, high treatment capacity, low liquid holdup, high mass transfer effect, convenient for starting and stopping, remote automatic control (Leonard et al 1997;Fu 2004;Li and Yuan 2007). With the above advantages, some chemical plants have begun to treat phenol waste water with the centrifugal extractor (Xu et al 1999;Yu et al 2001;Wang et al 2001;Tang et al 2012;Mishra et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Study on extraction phenol from coal tar with high flux centrifugal extractor

Zhao

Mao

et al. 2017

Int J Coal Sci Technol

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Solvent extraction phenol from coal tar were carried out with novel composite YH-3 as extraction agent, and the high flux centrifugal extractor was used as extraction device. Under the premise of high phenol extraction rate, composite YH-3 extraction agent reduces p-p interaction between phenolic compounds and aromatic hydrocarbons, thus decreasing the entrainment of neutral oil. The optimization of operation conditions, such as the diameter of heavy phase weir HWD, the flow ratio, the total flow rate and the rotation speed, are necessary. For single stage extraction experiment, the mass transfer efficiency was up to 84% while the rate of extraction agent loss was lower than 0.28% with the operation conditions of 29 mm of the heavy phase weir diameter (HWD), 1:1-1.4:1 of the flow ratio range, 160-200 mL/min of the total flow rate and the rotation speed varied from 2200 to 2600 r/min. For three stage counter-current test, the mass transfer efficiency reached up to 92.6% with the optimum operation condition of 29 mm of the HWD, 1:1 of the flow ratio, 200 mL/min of the total flow rate and 2400 r/min of the rotation speed. The results indicated that phenol could be extracted effectively from coal tar in the process of multistage continuous count current centrifugal extraction.

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