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Journal articles on the topic 'Coal'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Kotik, O. S., N. V. Pronina, N. S. Inkina, and P. A. Beznosov. "Composition Peculiarities of the Upper Devonian Coaly Rocks (The Sula River Section, North Timan)." Литология и полезные ископаемые, no. 5 (September 1, 2023): 499–514. http://dx.doi.org/10.31857/s0024497x23700192.

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A detailed coal-petrographic and mineralogical-geochemical study of humic coals and coaly rocks in the Sargaev deposits of the Upper Devonian of the Northern Timan (Sula River), which is an example of the burial of the most ancient coal-forming plants, has been carried out. The following types of organic rocks are identified in the section: “jet-like” coal, liptobiolitic silty-clayey coal, and silty-clayey-coaly mixtolites. The studied coals and coaly rocks are composed of humic organic components, represented by vitrinite and liptinite macerals, the inertinite group is of subordinate importan

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2

Feng, Songbao, Qiang Wei, and Xianqing Li. "Chemical Composition Variations of Altered and Unaffected Coals from the Huaibei Coalfield, China: Implications for Maturity." Energies 14, no. 11 (2021): 3028. http://dx.doi.org/10.3390/en14113028.

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The composition characteristics of altered coals in the Huaibei Coalfield, China, was investigated through a comparative analysis between altered and unaffected coals from the Wolonghu, Taoyuan and Renlou coal mines. Results indicated that the altered coals in Wolonghu coal mine are mostly anthracite coals, with a maximum vitrinite reflectance of 1.6–3.9% (average of 2.9%). Coals from Wolonghu coal mine were mainly consisted of vitrinite (66.2–97.0%), followed by inertinite (2.0–4.0%) and exinite (0.4–6.9%). Differences in volatile matter content were observed between the altered coals in Wolo

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3

Zhou, Guoxiao, Guoqi Wei, and Guoyi Hu. "The geochemical and organic petrological characteristics of coal measures of the Xujiahe formation in the Sichuan Basin, China." Energy Exploration & Exploitation 37, no. 3 (2019): 889–906. http://dx.doi.org/10.1177/0144598719842332.

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Upper Triassic coaly and lacustrine source rocks complicate efforts to determine the source of hydrocarbons in Sichuan Basin. Total organic carbon analyses, pyrolysis experiments, petrological examinations, and gas chromatography and gas chromatography–mass spectrometry determinations were conducted on coals, carbonaceous mudstones and mudstones collected from two outcrop sections and cores of nine wells. Results revealed that the abundant organic carbon content will prolong the hydrocarbon generation cycle for coals and then the hydrocarbon generating capacity of coals will be enhanced by sal

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El-Tawil, Asmaa A., Bo Björkman, Maria Lundgren, Frida Bäck, and Lena Sundqvist Ökvist. "Influence of Modified Bio-Coals on Carbonization and Bio-Coke Reactivity." Metals 12, no. 1 (2021): 61. http://dx.doi.org/10.3390/met12010061.

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Substitution of coal in coking coal blend with bio-coal is a potential way to reduce fossil CO2 emissions from iron and steelmaking. The current study aims to explore possible means to counteract negative influence from bio-coal in cokemaking. Washing and kaolin coating of bio-coals were conducted to remove or bind part of the compounds in the bio-coal ash that catalyzes the gasification of coke with CO2. To further explore how the increase in coke reactivity is related to more reactive carbon in bio-coal or catalytic oxides in bio-coal ash, ash was produced from a corresponding amount of bio-

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5

Li, Hui, Xiaoling Song, Gang Li, et al. "Effect of Coal Blending on Ash Fusibility and Slurryability of Xinjiang Low-Rank Coal." Processes 10, no. 9 (2022): 1693. http://dx.doi.org/10.3390/pr10091693.

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This work investigated the effect of coal blending on ash fusibility and slurryability of Xinjiang low-rank coal. The results showed that Xinjiang low-rank coals were characterized by high internal water content, high volatile content, high ash fusing point, and poor slurryability, which can not be directly used in coal water slurry gasification. The blending method not only reduced the ash fusibility but also improved the slurryability of these low-rank coals. When the coals with low calcium and high silicon contents (KG and YK) were blended with coal with high calcium content (SH), the ash f

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Kumar, Manish, and Hari Prakash Tiwari. "Efficient utilization of Indian Coking Coal: Opportunities and challenges." Metallurgical Research & Technology 117, no. 2 (2020): 209. http://dx.doi.org/10.1051/metal/2020017.

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The preservation of coking coal and the reduction of coke cost are gaining much importance in iron and steel industry. An effort is being made worldwide to maximize the use of inferior quality of coking coal in cokemaking without sacrificing the coke quality to minimize the coke cost. In general, Indian coking coals contain lower content of vitrinite (≤ 50%) and higher content of ash (≥ 15%) as compared to imported coking coal. Indian coking coals have poor washability characteristics also. Therefore, for making coal blend for coke making, selection of an appropriate proportion of Indian cokin

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7

Ramdhani, Muhammad Rizki, Yan Rizal R, Sigit Arso Wibisono, Soleh Basuki Rahmat, Muhammad Abdurachman Ibrahim, and Eko Budi Cahyono. "Characteristic Analysis of Indonesian Low and Medium Rank Coals and Their Influence on Carbon Dioxide Adsorption Capacity." Indonesian Journal on Geoscience 11, no. 3 (2024): 391–407. https://doi.org/10.17014/ijog.11.3.391-407.

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Indonesia has great deep-seated coal potential , such as Lakat coal and Muaraenim coal, which can be utilized as a medium for Carbon Capture and Storage (CCS). These coals vary in characteristic which affects their ability to adsorb or store carbon dioxide gas (CO2). The moisture content of the Lakat coal is less than that of the Muaraenim coal, while the ash content of Lakat coal is 4-5 times higher than the Muaraenim coal. Lakat coal contains more vitrinite content than Muaraenim coal, while Muaraenim coal contains more inertinite content than Lakat coal. The CO2 gas adsorption capacity of M

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8

Scott, S. G., and P. Crosdale. "THE WALLOON COAL MEASURES—THE NEXT COAL SEAM GASTARGET?" APPEA Journal 40, no. 1 (2000): 86. http://dx.doi.org/10.1071/aj99006.

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The Queensland coal seam gas industry has grown over the last 12 years. During this time the vast majority of exploration wells have targeted the Late Permian coal measures in the Bowen and Galilee Basins. These formations have been the major target because they contain coals with a vitrinite reflectance ranging above 0.7%. This range has always been seen as the main period for methane generation.As well as containing vast quantities of Permian coal, Queensland also has vast quantities of Middle Jurassic coals within its Mesozoic Basins. These coals have received little-to-no exploration for t

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9

Zhang, Qiuli, Min Luo, Long Yan, Aiwu Yang, and Xiangrong Hui. "Kinetic Analysis of Low-Rank Coal Pyrolysis by Model-Free and Model-Fitting Methods." Journal of Chemistry 2019 (November 11, 2019): 1–7. http://dx.doi.org/10.1155/2019/9075862.

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Coal SJC, coal WJG, coal ZJM, and coal HCG were selected to investigate the pyrolysis kinetics of northern Shaanxi coals. TG and DSC experiments of four coals were carried out with a synchronous thermal analyzer at heating rates 5, 10, 15, and 20 C/min, respectively. The pyrolysis characteristics were described by thermogravimetric data, and the kinetic parameters were calculated by Flynn–Wall–Ozawa (FWO), Kissinger, general integration, and MacCallum–Tanner methods. The results show that coal SJC, coal ZJM, and coal HCG all conform to the reaction series equation, the thermal decomposition re

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10

Amangeldikyzy, A., A. N. Kopobayeva, G. G. Blyalova та N. S. Askarova. "Қарағанды көмір бассейні көмірінің геохимиялық мамандануы". Горный журнал Казахстана, № 7(219) (8 серпня 2023): 15–20. http://dx.doi.org/10.48498/minmag.2023.219.7.008.

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There are over 300 coal basins and deposits known in Kazakhstan, the largest of them is the Karaganda Coal Basin. There is approximately a half of all industrial reserved of coal of Kazakhstan is located in its subsoils. The Karaganda Coal Basin is the forth in the CIS according to its size and coal reserves. Unique coal resources require a comprehensive and scientifi cally justifi ed approach to their research. This paper studies the impurity elements distribution pattern to assess the geochemical speciation of coals in the Karaganda Coal Basin. As a result of the research performed, it has b

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11

Ren, Wenying, Liu Yang, Qingyi Cao, and Chaoming Liang. "Concentration, distribution and occurrence of mercury in Chinese coals." E3S Web of Conferences 290 (2021): 03003. http://dx.doi.org/10.1051/e3sconf/202129003003.

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Mercury in coals is one of the important sources of atmospheric mercury, which is potentially harmful to the ecological environment. Based on the data of 970 coal samples, the concentration, spatial distribution and occurrence of mercury in Chinese coals were analyzed. The main conclusions are as follows: The distribution of mercury concentration in Chinese coalfields is uneven; medium and high mercury coals are mainly distributed in southwest China and eastern Inner Mongolia. The mercury concentrations in various coal-forming periods are as follows: K (0.320 mg/kg) > P2 (0.220 mg/kg) >

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12

Fatia Umar, Datin, Zulfahmi, Nendaryono Madiutomo, et al. "Low-rank coal upgrading to optimize its utilization as fuel." IOP Conference Series: Earth and Environmental Science 1378, no. 1 (2024): 012031. http://dx.doi.org/10.1088/1755-1315/1378/1/012031.

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Abstract Indonesia’s coal resources and reserves are mostly categorized as low-rank coal, lignite and sub-bituminous coals. Most of them have a high content of moisture, a low calorific value, and a high tendency to low-temperature oxidation and self-combustion, making them difficult to transport over long distances. To increase the utilization of the low-rank coals, a drying treatment was carried out by heating the coal at a temperature and pressure of 160°C and 3.5 Bar respectively for about 15 minutes. Two low-rank coal samples, from South Sumatra (A coal) and South Kalimantan (B coal) were

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13

Brady, Lawrence L., and Joseph R. Hatch. "Chemical Analyses of Middle and Upper Pennsylvanian Coals from Southeastern Kansas." Bulletin (Kansas Geological Survey), no. 240 (March 18, 1998): 43–65. https://doi.org/10.17161/kgsbulletin.no.240.20408.

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Elemental and chemical analyses and physical tests were conducted on 36 samples of Middle and Upper Pennsylvanian coals from southeastern Kansas. Concentrations of 35 minor and trace elements in these coals were statistically compared with concentrations in coals of similar rank and age from other areas in the western region of the Interior Coal Province, showing that Kansas coals have significantly higher concentrations of copper, arsenic, and lead. The zinc content in Kansas coal samples ranges from 160 to 51,000 ppm (whole-coal basis), the maximum value being the highest zinc value reported

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14

Wang, Ruoyu, Wenfeng Wang, Qingfeng Lu, Jiaming Zhang, Wenlong Wang, and Lingling Dong. "Geochemistry of Middle Jurassic Coals from the Dananhu Mine, Xinjiang: Emphasis on Sediment Source and Control Factors of Critical Metals." Minerals 14, no. 8 (2024): 767. http://dx.doi.org/10.3390/min14080767.

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In recent years, coal-type critical metal deposits have become a research hotspot in coal geology. As a major coal-accumulating basin in the Xinjiang area, the Turpan-Hami Basin contains abundant coal resources and has the potential to become a large coal-type critical metal deposit. However, previous studies on the enrichment characteristics of critical metal elements in coal are few and need further research. Based on SEM-EDS, XRF, and ICP-MS experiments, this study investigates the coal petrology, mineralogy, and geochemistry of the No. 22 coal of the Xishanyao Formation from the Dananhu Co

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15

Neupane, Bhupati, and Bishow Raj Silwal. "Study of microstructure, maceral and mineral matter in two different coals of the Nepal Himalaya." Journal of Nepal Geological Society 56, no. 1 (2018): 9–17. http://dx.doi.org/10.3126/jngs.v56i1.22695.

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The Eocene coals from the western (Tosh coalfield) and central regions (Jhadewa coalfield) of the Nepal Himalaya have been studied under the petrological and the Scanning Electron Microscopes to explain the mode of occurrence of mineral matter and their microstructural relations with organic constituents. As shown by the results of the coal samples, three kinds of coals in diminishing abundance are moderately dull coal, moderately bright coal and bright coal. Distribution of mineral matter in the Eocene coals shows that the bright coal is rare in western Nepal and the moderately bright coal is

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16

Zhang, Yanbo, Xiangyang Liu, and Wei Zhao. "Coal-Hosted Al-Ga-Li-REE Deposits in China: A Review." Minerals 15, no. 1 (2025): 74. https://doi.org/10.3390/min15010074.

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Investigation of the critical metal elements in coal and coal-bearing strata has become one of the hottest research topics in coal geology and coal industry. Coal-hosted Ga-Al-Li-REE deposits have been discovered in the Jungar and Daqingshan Coalfields of Inner Mongolia, China. Gallium, Al, and Li in the Jungar coals have been successfully extracted and utilized. This paper reviews the discovery history of coal-hosted Ga-Al-Li-REE deposits, including contents, modes of occurrence, and enrichment origin of critical metals in each coal mine, including Heidaigou, Harewusu, and Guanbanwusu Mines i

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17

Kortenski, Jordan, and Anton Sotirov. "Occurrence and distribution of the siderophile elements in some Bulgarian coals." Geologica Balcanica 34, no. 3-4 (2004): 71–88. http://dx.doi.org/10.52321/geolbalc.34.3-4.71.

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Coals from fourteen Bulgarian basins and deposits were sampled. The siderophile elements Fe, Ni, Co, Mn, Cr, V, Ti and their distribution were studied in these samples. The coals have different rank and age. The studied lignite was taken from the Neogene Maritsa-West, Stanyantsi, Belibreg, Chukurovo, Sofia, Karlovo, Samokov, Kyustendil, Oranovo, Gabrovitsa, and Katrishte basins. Subbituminous coal was taken from the Paleogene Pernik Basin, bituminous coal was from the Eocene Suhostrel and Cenomanian Balkan Basins, and the Svoge Pensilvanian anthracite was also investigated. Most of the studied

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18

Bukowska, Mirosława, Urszula Sanetra, and Mariusz Wadas. "Zonation of deposits of hard coals of different porosity in the Upper Silesian Coal Basin." Gospodarka Surowcami Mineralnymi 32, no. 1 (2016): 5–24. http://dx.doi.org/10.1515/gospo-2016-0009.

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Abstract The article presents the results of tests of porosity of the Upper-Silesian Coal Basin (USCB) hard coals. The porosity was determined for various lithotypes of hard coal, collected in different areas of the Upper-Silesian Coal Basin. Samples of hard coal were collected in 60 seams of 16 coal mines, from the depth of approximately between 350 and 1200 m. There are also presented differences in values of open porosity of coal depending on the depth of occurrence, as well as chronostratigraphic and tectonic correlation of a seam. Uniaxial compression strength of the tested coals falls in

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19

Liu, Yang, and Di Wu. "The Research of Variation Regularity of Coal Bed Methane Production in CO₂ Flooding." Advanced Materials Research 868 (December 2013): 677–81. http://dx.doi.org/10.4028/www.scientific.net/amr.868.677.

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CO2flooding can increase coal bed methane production rate, enhance coal bed methane recovery and store CO2into underground. It has good application prospect for CBM development. This paper analyzes the adsorption-desorption law of mixed gas in the coal during the CO2injection process, as well as the diffusion and seepage law of gas in the coal seam. The sensitivity of factors affecting coal bed methane production is studied and then the coal bed methane production under different conditions is simulated numerically. The results show that methane concentration and coals permeability are the two

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20

Umar, Datin, Suganal Suganal, Ika Monika, Gandhi Hudaya, and Dahlia Diniyati. "The influence of steam drying process on combustion behavior of Indonesian low-rank coals." Indonesian Mining Journal 23, no. 2 (2020): 105–15. http://dx.doi.org/10.30556/imj.vol23.no2.2020.1105.

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Steam drying process of the Low Rank Coals (LRCs) has been conducted to produce coal which is comparable with the High Rank Coal (HRC). Characterization of the raw and dried coals was carried out through proximate, ultimate, calorific value, Fourier Transform Infrared (FTIR) spectroscopy and Thermo Gravimetry-Differential Thermal Analysis (TG-DTA) to study the combustion behavior of the coals. This study used Indonesian low rank coals coming from Tabang (TKK coal) and Samurangau (SP coal), East Kalimantan. The results indicate that the calorific value of the dried coals increases significantly

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21

Wang, Guang Heng, and An Ning Zhou. "Effect of Coal Structure on Mechanical and Thermal Properties of Coal Filled Soy Protein Composites." Advanced Materials Research 236-238 (May 2011): 288–91. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.288.

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Using different rank coals as filler, coal-soy protein isolate (SPI) composites were prepared by compression molding processing using glycerol as plasticizer. The structure of the coals used were characterized by Fourier transform infrared (FTIR), ultimate analysis, and surface functional group analysis. The effects of coal structure on the mechanical properties, water resistance, and thermal properties were investigated. The results showed that, in different rank coals, the atomic ratio of oxygen to carbon, carboxylic acid groups, phenolic hydroxyl groups, lactone bonds, and aliphatic chains

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22

Li, Han Xu, Xiang Cao, and Yong Xin Tang. "Study of Effect of Ternary-Component Blended Coal on Coal Gasification Reaction at High Temperature." Applied Mechanics and Materials 295-298 (February 2013): 3104–9. http://dx.doi.org/10.4028/www.scientific.net/amm.295-298.3104.

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Three typical Chinese individual coals which existed remarkable difference on coal ash chemical composition and ash fusion temperature were selected to carry out coal blending experiments to study the coal gasification reaction at high temperature by means of using ternary-component blended coal technique and TGA-DTA method. According to ternary-component blended coal with a certain proportion, ash chemical composition and coal-char/CO2 gasification reactivity were analyzed by X-ray fluorescence (XRF) and thermogravimetric analysis-derivative thermogravimetric analysis (TGA-DTG), respectively.

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23

Yang, Xi Yuan, Mei Li Du, Jin Ren Zhang, and Jian Li Yang. "Study on Coal Separability for Wangcun Inclined Shaft in Chenghe." Advanced Materials Research 734-737 (August 2013): 1082–85. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.1082.

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On the basis of the coal quality characteristics, the screening and drifting tests have been carried out to investigate the separability of the coals in the inclined shaft coal samples of Chenghe Wangcun coal mine. The results showed that the mine raw coal seams are medium ash, high sulfur and medium volatile coals. The screening test results showed that the water content and sulfur content of coals samples in each grade after sieving essentially remained the row coal characteristic. Heating value increased with the decrease of particle size, but ash content decreased with the particle size. T

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24

Bielowicz, Barbara, and Jacek Misiak. "The Impact of Coal’s Petrographic Composition on Its Suitability for the Gasification Process: The Example of Polish Deposits." Resources 9, no. 9 (2020): 111. http://dx.doi.org/10.3390/resources9090111.

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In this paper, we discuss the impact of the rank of coal, petrographic composition, and physico-chemical coal properties on the release and composition of syngas during coal gasification in a CO2 atmosphere. This study used humic coals (parabituminous to anthracite) and lithotypes (bright coal and dull coal). Gasification was performed at temperatures between 600 and 1100 °C. It was found that the gas release depends on the temperature and rank of coal, and the reactivity increases with the increasing rank of coal. It was shown that the coal lithotype does not affect the gas composition or the

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25

Dziok, Tadeusz, and Andrzej Strugała. "Preliminary assessment of the possibility of mercury removal from hard coal with the use of air concentrating tables." Gospodarka Surowcami Mineralnymi 33, no. 4 (2017): 125–41. http://dx.doi.org/10.1515/gospo-2017-0043.

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Abstract Mercury is characterized by highly toxic properties. The natural biogeochemical cycle of mercury occurs in the environment, which results in the fact that even a small amount of mercury emitted to the environment is a potential threat to human health. The process of coal combustion is one of the main sources of anthropogenic mercury emissions. For this reason, on 31 July 2017 the European Commission has adopted the mercury emission standards for large combustion plants. The issue of mercury emissions is particularly important for Poland. Forecasts concerning energy consumption in Pola

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26

Ren, Xiao Yuan, Zhi Yuan Yang, Shi Cun Qu, and Jiang Long. "The Effect of Sodium Dodecyl Sulphate (SDS) on Wettability of Different Coals." Advanced Materials Research 734-737 (August 2013): 513–16. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.513.

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Three coals (Jincheng coal, Hancheng coal and Shan-bei coal) varying widely in coal type have been treated with anionic surfactant Sodium Dodecyl Sulphate (SDS). The effect of SDS on wettability of coals was explored by contact angles and zeta potentials characterisation techniques. Results obtained show that the addition of SDS can obviously improve the wettability of coals, and as the coal rank decreases, the wettability increases under investigation. Moreover, the wettability obviously increases with the significant decrease of particle size. The zeta potential for each coal, in the absence

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27

Chandaliya, Vimal Kumar, Saibal Trivedy, Avinash Tiwary, Asaithambi Suresh, Pratik Swarup Dash, and Abanti Sahoo. "Utilization of steel plant waste and by-products in reactive coke making." Metallurgical Research & Technology 120, no. 1 (2023): 103. http://dx.doi.org/10.1051/metal/2022109.

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Coke is used in the blast furnace as a fuel. To produce the coke, metallurgical coals are blended in the coal blend. But the reserves of the coking coals are limited in India. Hence, there is a need to use the non-coking coals in the blast furnace. However, there is a limitation for use of non-coking coals in the coal blend for coke making. So, an attempt was made in this study to increase the amount of non-coking coals in the coal blends. In the present work, briquetting technique was used for producing briquettes having non-coking coal up to 40%, and rest is slightly coking coal along with r

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28

Wang, Linlin, and Zhengjiang Long. "Evolutions of CO2 Adsorption and Nanopore Development Characteristics during Coal Structure Deformation." Applied Sciences 10, no. 14 (2020): 4997. http://dx.doi.org/10.3390/app10144997.

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The coal structure deformation attributed to actions of tectonic stresses can change characteristics of nanopore structure of coals, affecting their CO2 adsorption. Three tectonically deformed coals and one undeformed coal were chosen as the research objects. The isotherm adsorption experiments of four coal specimens were carried out at the temperature of 35 °C and the pressure of 0 to 7 MPa. Nanopore structures were characterized using the liquid nitrogen adsorption method. The results show that there exist maximum values of excess and absolute adsorption capacity, which increase with increas

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So, Min Seop, Duncan Kibet, Tae Kyeong Woo, Seong-Joon Kim, and Jong-Ho Shin. "Prediction of SOx-NOx Emission in Coal-Fired Power Plant Using Deep Neural Network." Machines 11, no. 12 (2023): 1042. http://dx.doi.org/10.3390/machines11121042.

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Coal has been used as the most commonly energy source for power plants since it is relatively cheap and readily available. Thanks to these benefits, many countries operate coal-fired power plants. However, the combustion of coal in the coal-fired power plant emits pollutants such as sulfur oxides (SOx) and nitrogen oxides (NOx) which are suspected to cause damage to the environment and also be harmful to humans. For this reason, most countries have been strengthening regulations on coal-consuming industries. Therefore, the coal-fired power plant should also follow these regulations. This study

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Maussymbayeva, A. D., V. M. Yurov, V. S. Portnov, M. Rabatuly, and G. M. Rakhimova. "Assessment of the influence of the surface layer of coals on gas-dynamic phenomena in the coal seam." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 2 (April 30, 2024): 5–11. http://dx.doi.org/10.33271/nvngu/2024-2/005.

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Purpose. Development of physical and mathematical model linking nanostructured surface layer of coal substance with geodynamic phenomena of coal seam, through adhesion energy of different layers and coal grades, melting temperature of the nanolayer, determination of the role of stress-strain state of the seam in the formation of fine coal and methane at their emissions into the mine workings. Methodology. Mathematical and experimental studies of the regular change in the surface layer of coal substance depending on the grade of coals for different formations of the Karaganda basin; assessment

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Hong, Lin, Wenjing Wang, Dameng Gao, and Wentong Liu. "Critical pore size for micropore filling in coal samples with different rank coals." PLOS ONE 17, no. 3 (2022): e0264225. http://dx.doi.org/10.1371/journal.pone.0264225.

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The objectives of this study were to explore the occurrence and migration of coalbed methane in coals of different ranks and reveal the microscopic reservoir space and the mechanism of coalbed methane. To meet these objectives, this study selected six coal samples of different coal ranks for low-pressure N2 adsorption experiments, explored the critical pore filling characteristics of packed N2 molecules in the coals, and analyzed the low-pressure N2 adsorption/desorption experimental isotherms using the DFT method and DA equation based on the micropore filling theory. Finally, the critical fil

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Liu, Jian Zhong, Yu Jie Yu, Jun Hu Zhou, et al. "Study on the Effects of Coal Blending on the Slurry Ability of Shenmu Coals." Advanced Materials Research 383-390 (November 2011): 3011–16. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.3011.

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Shenmu coals as low rank coal are difficult to prepare for Coal Water Slurry (CWS). The maximum slurry concentration of Shenmu CWS is lower than 60%, which is not available for practical application. Coal blending is a simple operation and low cost method to improve the slurry ability of low rank coal. Two different kinds of anthracite and bituminous coal samples were blended in Shenmu coal to study the effect on the preparation of CWS, respectively. The results showed that the maximum solid concentration of CWS increased as the proportion of high rank coal rise. And the viscosity of CWS is dr

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Wierzchowski, Krzysztof, Jarosław Chećko, and Ireneusz Pyka. "Variability of Mercury Content in Coal Matter From Coal Seams of The Upper Silesia Coal Basin." Archives of Mining Sciences 62, no. 4 (2017): 843–56. http://dx.doi.org/10.1515/amsc-2017-0058.

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Abstract The process of identifying and documenting the quality parameters of coal, as well as the conditions of coal deposition in the seam, is multi-stage and extremely expensive. The taking and analyzing of seam samples is the method of assessment of the quality and quantity parameters of coals in deep mines. Depending on the method of sampling, it offers quite precise assessment of the quality parameters of potential commercial coals. The main kind of seam samples under consideration are so-called “documentary seam samples”, which exclude dirt bands and other seam contaminants. Mercury con

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Qi, Ling Ling, Zhao Feng Wang, and Hong Min Yang. "Research on the Differences of the Pore Characteristics with Different Destroyed-Type Coals." Advanced Materials Research 619 (December 2012): 598–602. http://dx.doi.org/10.4028/www.scientific.net/amr.619.598.

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In order to investigate the pore characteristics of the different destroyed-types of coals and its effects of coal and gas outburst, this article studyed the low temperature nitrogen adsorption curve, specific surface area, pore volume and its distribution with the method of low-temperature nitrogen adsorption, also studed their changes with the different destroyed-type of coals, and the influences of pore shape and distribution for coal and gas outburst. The results showed that three different destroyed-types of coals have loops, the pore shapes of the coals mainly open-shaped, maybe also con

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Wang, Yong Zheng, Xiu Juan Li, Su Le Tian, and Chun Mei Lu. "Experimental Study on the Pollutants Release Characteristics During Combustion of Lean Coal with Different Coal Rank." Advanced Materials Research 518-523 (May 2012): 2143–46. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.2143.

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In this paper, the characteristics of SO2 and NO release during combustion of lean coal with different coal rank were experimentally studied in the one-dimensional furnace for pulverized coal combustion. The results showed: The coal property and proportion of the component coals have great influence on the characteristics of SO2 and NO release. The releasing concentration of SO2 and NO distributing along the furnace height is generally between that of component coals, and the releasing characteristics of SO2 and NO would be more near to that of the larger proportion coal. The measuring value o

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Teng, Juan, Yan Bin Yao, Da Meng Liu, Zhi Qiang Liu, and Bei Liu. "Identification of Coal Petrologic-Structure by Using Geophysical Logging Data: A Case Study of the Coals of Hancheng Coalbed Methane Field." Applied Mechanics and Materials 316-317 (April 2013): 795–98. http://dx.doi.org/10.4028/www.scientific.net/amm.316-317.795.

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Coal petrologic structure is important for the prediction of coal and the associated coalbed methane outburst during coal mining. This paper discusses the relationship between the response characteristics of natural gamma (GR), laterlog deep (LLD) and compensation density curve (RHOB), and the coal structures. Results show that the tectonic-coals (the coals with high breakage degree by tectonic structures) can be identified by the logging characteristics of low amplitude of GR (20-90 API), high amplitude of LLD (300-1800 Ωm), and low amplitude of RHOB (1.25-1.5g/cm3). It was found that with in

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Mohd Samsuri, Muhamad Shazarizul Haziq, Hasril Hasini, Noor Akma Watie Mohd Noor, and Meor Mohd Faisal Meor Zulkifli. "Temperature Profile Assessment of Sub-Bituminous Coal by Using a Single Burner Combustion Test Facility." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 78, no. 1 (2020): 1–10. http://dx.doi.org/10.37934/arfmts.78.1.110.

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This paper presents a thermogravimetric analysis and combustion test for different coals used in a coal-fired power plant in Malaysia. The main objective is to investigate the suitability of adopting a newly-introduced sub-bituminuous coal in an existing boiler furnace commonly firing standard design coals. In order to ensure that the new coal will not give an adverse effect to the boiler, detail analytical and thermal performance of the new coal is investigated, together with design and other limiting coals. The combustion test was performed in a scaled down, 150kW, single swirl burner combus

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Hlajoane, S., and L. S. Mokhahlane. "Rare Earth Elements enrichment in Triassic coals deposits and associated argillaceous rocks in Lesotho." Journal of the Southern African Institute of Mining and Metallurgy 124, no. 10 (2024): 583–94. http://dx.doi.org/10.17159/2411-9717/3217/2024.

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The demand for rare earth elements has increased around the world due to their application in a variety of technological advancements. Previous studies have evaluated the potential of the rare earth elements and yttrium (REY) hosted within the Permian coal deposits of the main Karoo Basin (MKB) in Southern Africa. However, not a lot of scientific research has gone into the Triassic coal deposits. The Triassic coals in South Africa were the first coals to be exploited for their thermal use in the 1880s, but the discovery of the higher rank and more abundant Ecca coal deposits led to the Triassi

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Kopobayeva, A. N., I. V. Baydauletova, A. Amangeldikyzy, N. S. Askarova, and G. G. Blyalova. "Nature of ree accumulation in clayey interlayers and coals in Karaganda coal basin." Kompleksnoe Ispolzovanie Mineralnogo Syra = Complex Use of Mineral Resources 332, no. 1 (2024): 49–61. http://dx.doi.org/10.31643/2025/6445.04.

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It is the first completed complex mineralogical and geological research of REE (Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) in the coals of Karaganda coal basin in Central Kazakhstan. This paper presents the results of the research of REE (from lanthanum to lutetium and Y) distribution in 85 samples of coal and clayey interlayers of stratum k7 of Karaganda coal basin in the faces of Saranskaya, T.Kuzembayev, Aktasskaya mines. The ultimate composition of clayey interlayer and coal samples was analyzed by the methods of inductively coupled plasma optical emission spectroscopy and

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Fang, Jiuwen, Mingxin Li, Baosheng Gao, et al. "Numerical simulation of pulverized coal combustion in a 660MW tangentially fired boiler with fuel variation." Journal of Physics: Conference Series 2599, no. 1 (2023): 012022. http://dx.doi.org/10.1088/1742-6596/2599/1/012022.

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Abstract To study the effects of various coal properties on the combustion characteristics during actual operation, and on the high temperature corrosion of the water wall. The paper presents a numerical simulation of a 660MW boiler using ANSYS FLUENT software. Three cases were investigated with various fuel properties: (1) the designed coal NO.1, (2) the non-designed coal NO.2 with high ash, high sulphur content and low volatile matter, (3) the blended fuel of coal NO.3with similar coal quality to the coal NO.1 and NO.4 with high sulphur content. Simulation results indicate that blended coal

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Gong, Shuang, Zhen Wang, Lei Zhou, and Wen Wang. "Influence of Cyclic Impact Loading and Axial Stress on Dynamic Mechanical Properties of Burst-Prone Coal." Shock and Vibration 2021 (January 13, 2021): 1–10. http://dx.doi.org/10.1155/2021/6649308.

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High in-situ stress and frequent dynamic disturbances caused by the mining process in deep coal mines can easily induce dynamic disasters such as coal burst. We conducted laboratory experiments to assess the effects of the axial stress loading and dynamic cyclic impact loading on the dynamic mechanical properties of burst-prone coals by using a modified split Hopkinson pressure bar (SHPB). Comparisons were made using two types of burst-prone and burst-resistant coal samples. The mineral components, organic macerals, and dynamic mechanical features of both burst-prone and burst-resistant coal s

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Antoshchenko, М. I., V. Yu Tarasov, О. I. Zakharova, and Ye I. Zubtsov. "Research of vitrinite and fusinite coals for predicting geological hazards in coal seams." Мінеральні ресурси України, no. 3 (November 12, 2020): 45–49. http://dx.doi.org/10.31996/mru.2020.3.45-49.

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To establish the necessity of dividing fossil coals into vitrinitic and fusinitic varieties in order to identify the hazardous properties of coal seams during mining. Methodology. The study of changes in conditional indices in the general ranking series was carried out according to DSTU 25543-2013 separately for the classification indicators of vitrinite and fusinite coals, as well as coal groups not assigned to the considered varieties. Changes in indices in the ranks of classification indicators allow us to identify the distinctive or unifying features of the construction of these seri

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Kara, Hatice, Leyla Kalender та Mehmet Çağay Yumutgan. "Trace Element Geochemistry and Stable Isotopic (δ13C and δ15N) Characterisation of Nevşehir Coals, Türkiye". Minerals 15, № 2 (2025): 151. https://doi.org/10.3390/min15020151.

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The Nevşehir coals are located in the Central Anatolian Crystalline Complex (CACC), Türkiye, and no reports exist on trace element, nitrogen, and carbon isotope composition data of the Nevşehir coals. The present study aims to geochemically characterise the Nevşehir coals to determine their trace elemental enrichment patterns and possible sources. Nevşehir coals are found within Late Miocene Kızılöz Formation (Arafa Member) rocks. These coals are part of the huminite maceral group; the dominant maceral group is ulminites. The minerals in coals are inorganic, such as oxidised framboidal pyrite,

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Hartiniati, Hartiniati. "UJI PENINGKATAN MUTU BATUBARA PERINGKAT RENDAH SUMATERA SELATAN." Jurnal Energi dan Lingkungan (Enerlink) 7, no. 1 (2011): 9. http://dx.doi.org/10.29122/elk.v7i1.2729.

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A study of coal upgrading by way of evaporative method using coal from SouthSumatra is conducted. Preliminary inestigation on Upgrading of Brown Coal(UBC) process using Central and South Banko coals suggests that the processcan be applied to both coals (called S-BK and C-BK) without any operationalproblem. It produces high quality-stable coals in the briquette form with a calorificvalue of more than 6,500kcal/kg. Moreover, its spontaneous combustioncharacteristic is also suppressed comparing to that conventional drying method.This is due to the addition of aspal (heavy oil) in the solution of

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Baskoro, Ardian Nugra, Farhan Hadi Taskaya, Ignatio Senoaji Jagad Mitro Prajasto, and Robby Anggoro. "Heat Quality Enhancement and Carbon Dioxide Emissions Reduction from Coal Burning by Combining Low-Ranked Coal with Biomass Waste as A Clean Energy Solution to Achieve Energy Security in Indonesia." Indonesian Journal of Energy 4, no. 2 (2021): 115–28. http://dx.doi.org/10.33116/ije.v4i2.120.

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Indonesia is the fifth largest coal producer in the world with coal reserves reaching 39.56 billion tonnes. Coal reserves of medium and high quality are expected to be exhausted in 2048, therefore it is necessary to utilize low-ranked coals. Low-ranked coals have a low heating value (<5,100 kcal/kg) and produce greater CO2 emissions compared to medium and high rank coals. One method to increase heating value and reduce CO2 emissions from low-ranked coals is through the Utilization of hybrid coal. Hybrid coal is low quality coal combined with biomass waste and has undergone a pyrolysis proce

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Đulović, Izudin, Rejhana Dervišević, and Dževad Forčaković. "GEOLOGICAL CHARACTERISTICS OF THE KOTEZI MINING DISTRICT IN THE BUGOJNO COAL BASIN." Glasnik Rudarsko-geološko-građevinskog fakulteta 10, no. 10 (2022): 19–30. http://dx.doi.org/10.51558/2303-5161.2022.10.10.19.

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This paper presents geological characteristic of the deposit Kotezi of the Bugojno coal basin. Regional geological researches were conducted from 1983 to 1987, and detailed from 2014 to the end of 2018. After field research and laboratory tests, the analysis and interpretation of the obtained results was carried out. Based on the determined borders of surface distribution and the research results of the coal deposit Kotezi, proved are four coal layers: II bottom, I bottom, main and roof. Coal of the deposit Kotezi belong to the younger coals, soft to medium hard, no luster (matt), brown to bla

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Sharma, Naresh, and Hari Prakash Tiwari. "Techno-economic assessment for metallurgical coals: a ‘value-in-use’ approach." Metallurgical Research & Technology 121, no. 3 (2024): 306. http://dx.doi.org/10.1051/metal/2024026.

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The optimization of coke cost is the most significant cost-controlling factor for hot metal production. Therefore, worldwide cokemakers always have extra pressure from management to produce superior quality coke with inferior raw materials and optimal costs. Coke quality is crucial in blast furnace operation regarding cost and productivity. The quality of coke is significantly influenced by the quality of different categories, viz., prime hard coking coal, hard coking coal, soft coking coal and semi-soft coking coal of individual coals used in the coal blend. The impacts of these coals directl

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Purevsuren, B., J. Namkhainorov, S. Batbileg, and S. Jargalmaa. "Investigation on characterization of some high rank coals from Mongolia and preparation of coal derived activated carbon on their bases." Proceedings of Universities. Applied Chemistry and Biotechnology 15, no. 1 (2025): 92–103. https://doi.org/10.21285/achb.969.

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Mongolia possesses substantial coal resources (173 billion tons), which include high-rank bituminous coals, subbituminous coals, and brown coals. Based on these coal types, a manufacturer of activated carbon can be developed using comparatively simple technology. The consumption of activated carbon is continuously increasing due to its use in waste and drinking water treatments, atmospheric pollution control, gas mixture separation, and solvent recovery. Currently, Mongolia imports 700–800 tons of activated carbon annually at a price of 700–900 USD per ton. For this study, we have selected sev

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Malinnikova, Olga, Dmitry Uchaev, Denis Uchaev, and Vasiliy Malinnikov. "The study of coal tectonic disturbance using multifractal analysis of coal specimen images obtained by means of scanning electron microscopy." E3S Web of Conferences 129 (2019): 01017. http://dx.doi.org/10.1051/e3sconf/201912901017.

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The possibility of using a multifractal approach to study the tectonic disturbance of coals has been investigated. The relationship between the coal disturbance and the asymmetry of fractal spectra of coal images obtained by means of scanning electron microscopy (SEM) is revealed: it has been established that undisturbed coals are characterized, as a rule, by a symmetric fractal dimension spectrum, and the disturbed coals are described by a fractal spectrum with some degree of asymmetry. It is shown that if fractal spectra of images have a symmetric appearance, then brightness distributions of

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Hamdani, Ahmad Helman, Agus Didit Haryanto, and Muhamad Iqbal. "COAL STRUCTURAL CHARACTERISTICS OF BAYAH FORMATION BASED ON X-RAY DIFFRACTION ANALYSIS." International Journal of Research -GRANTHAALAYAH 10, no. 2 (2022): 28–34. http://dx.doi.org/10.29121/granthaalayah.v10.i2.2022.4495.

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The coal of Bayah Formation in Lebak Regency, Indonesia have been subjected to attenuated to X-ray diffraction (XRD), to study their chemical and structural characteristics. X-Ray Diffraction (XRD) has been widely used throughout the world and has high accuracy in identifying the molecular structure of coal. Curve-fitting analysis was employed to characterize coal structural. Based on ASTM, the coal rank from this area is high-volatile bituminous B. The research results show all coals have the similar coal structural crystallite characteristics. The value of d002 is in the range of 3.87 to 3.9

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