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Journal articles on the topic 'Coal liquefaction Waste disposal'

Author: Grafiati

Published: 10 December 2022

Last updated: 31 July 2025

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1

Uwaoma, R. C., C. A. Strydom, R. H. Matjie, J. R. Bunt, G. N. Okolo, and D. J. Brand. "Pyrolysis of Tetralin Liquefaction Derived Residues from Lighter Density Fractions of Waste Coals Taken from Waste Coal Disposal Sites in South Africa." Energy & Fuels 33, no. 9 (2019): 9074–86. http://dx.doi.org/10.1021/acs.energyfuels.9b01823.

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2

Fakoussa, R. M. "Production of water-soluble coal-substances by partial microbial liquefaction of untreated hard coal." Resources, Conservation and Recycling 1, no. 3-4 (1988): 251–60. http://dx.doi.org/10.1016/0921-3449(88)90020-1.

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3

Zhao, Hua, and Michael S. Franklin. "Ionic liquids for coal dissolution, extraction and liquefaction." Journal of Chemical Technology & Biotechnology 95, no. 9 (2020): 2301–10. http://dx.doi.org/10.1002/jctb.6489.

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4

Ren, Xiangkun, Dingye Fang, Jialu Jin, and Jinsheng Gao. "Study on flow patterns in different types of direct coal liquefaction reactors." Asia-Pacific Journal of Chemical Engineering 4, no. 5 (2009): 563–67. http://dx.doi.org/10.1002/apj.284.

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5

Marx, S., A. N. E. Laubscher, J. R. Bunt, R. J. Venter, R. C. Uwaoma, and C. A. Strydom. "Evaluation of sugar cane bagasse hydrothermal liquefaction products for co-gasification with coal as green coal pellet production." Bioresource Technology Reports 22 (June 2023): 101503. http://dx.doi.org/10.1016/j.biteb.2023.101503.

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6

Zhang, Li, Han Liu, Yifei Wang, and Yongzhen Peng. "Compositional characteristics of dissolved organic matter during coal liquefaction wastewater treatment and its environmental implications." Science of The Total Environment 704 (February 2020): 135409. http://dx.doi.org/10.1016/j.scitotenv.2019.135409.

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7

Chen, Huijun, Beibei Cui, Guochun Yan, et al. "The application of coal liquefaction residue raffinate slag-based sorbents for elemental mercury removal from coal-fired flue gas." Journal of Environmental Chemical Engineering 10, no. 1 (2022): 107045. http://dx.doi.org/10.1016/j.jece.2021.107045.

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8

Zhang, Li, Yongzhen Peng, and Jiachun Yang. "Transformation of dissolved organic matter during advanced coal liquefaction wastewater treatment and analysis of its molecular characteristics." Science of The Total Environment 658 (March 2019): 1334–43. http://dx.doi.org/10.1016/j.scitotenv.2018.12.218.

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9

Ghani, Zaidi Ab, Mohd Azlan Mohd Ishak, and Khudzir Ismail. "Direct liquefaction of Mukah Balingian low-rank Malaysian coal: optimization using response surface methodology." Asia-Pacific Journal of Chemical Engineering 6, no. 4 (2010): 581–88. http://dx.doi.org/10.1002/apj.442.

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10

Ji, Jie, Tong Ma, Ziyuan Zhang, Meng Ling, Xinqiang Xu, and Jianming Wei. "Evaluation of benzaldehyd and dioctyl phthalate modified direct coal liquefaction residue asphalt binder based on rheology and microscopic mechanisms." Cleaner Materials 12 (June 2024): 100238. http://dx.doi.org/10.1016/j.clema.2024.100238.

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11

Zhao, Runze, Lan Yang, Xue Song та ін. "Effects of sulfur additive on the transformation behaviors of γ-Fe2 O3 and coal liquefaction performances under mild conditions". Asia-Pacific Journal of Chemical Engineering 13, № 4 (2018): e2227. http://dx.doi.org/10.1002/apj.2227.

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12

Ramdoss, Prakash K., Chin-Hsian Kuo, and Arthur R. Tarrer. "Utilization of Petroleum Waste in Coal Liquefaction." Energy & Fuels 10, no. 4 (1996): 996–1000. http://dx.doi.org/10.1021/ef9600117.

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13

Murko, Vasilii, Marina Baranova, and Irina Grishina. "Deep processing of organic mass of finely dispersed coal waste." E3S Web of Conferences 315 (2021): 02014. http://dx.doi.org/10.1051/e3sconf/202131502014.

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The technological and technical possibility of deep processing of coal by its liquefaction using the methods of extreme mechanochemical and physical effects has been determined; recommendations have been developed for the applied use of the obtained materials in heat power engineering. The organic part of the solid mass of the prepared coal-oil suspension, which has turned into a relatively heavy organic liquid, can be used as a boiler or motor fuel, as well as a feedstock for the production of various hydrocarbon liquids. The resulting mixture of hydrocarbons can be subjected to rectification

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14

Dawson, R. F., N. R. Morgenstern, and A. W. Stokes. "Liquefaction flowslides in Rocky Mountain coal mine waste dumps." Canadian Geotechnical Journal 35, no. 2 (1998): 328–43. http://dx.doi.org/10.1139/t98-009.

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Over the past 25 years there have been a large number of long runout flowslides from Rocky Mountain coal mine waste dumps. The waste dumps are constructed as end-dumped fills with an angle of repose of 38°. Dump heights range between 100 and 400 m. The dumps are normally founded on mountain slopes that are covered with a thin veneer of granular colluvial and dense stony till materials. Conventional stability analyses carried out for these dumps using friction angles equal to the angle of repose for the waste rock and typical values ranging from 30 to 32° for the foundation materials indicate t

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15

Alexander, Brodt. "CONVERTING COAL MINING INTO UNDERGROUND PRODUCTION OF ARTIFICIAL OIL." Sustainable Extraction and Processing of Raw Materials Journal 3/2022, no. 3/2022 (2022): 27–31. https://doi.org/10.5281/zenodo.7006988.

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A method for direct liquefaction of coal is presented. After separating the coal from waste rock gravitationally in an aqueous salt solution, drying and grinding, the purified separated coal is mixed with a paste-forming reagent. The paste is ground until a colloidal particle size and hydrogenated for 2 hours at temperature of 405°C and 11 MPa hydrogen pressure. Artificial oil was obtained with over 95 % yield with respect to the initial amount of purified coal when the contact of excavated coal with air was avoided. Based on findings, a technology is proposed for underground coal liquefac

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16

Wang, Jieni, Weina Zhao, Yani Ai, Hongyan Chen, Leichang Cao, and Sheng Han. "Improving the fuel properties of biodiesel via complementary blending with diesel from direct coal liquefaction." RSC Advances 5, no. 56 (2015): 45575–81. http://dx.doi.org/10.1039/c5ra05291b.

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17

Bob Soile and Moses Akiibinu,Felix Oyeyiola. "Thermochemical Liquefaction Kraft Lignin As A Waste Management Process." JOURNAL OF ADVANCES IN CHEMISTRY 17 (June 9, 2020): 64–72. http://dx.doi.org/10.24297/jac.v17i.8715.

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Waste management is the collection, transportation, processing or disposal, monitoring, and managing of waste materials. It tries to reduce the harmful environmental impact of each through different methods, which include but not limited to landfill, incineration, recycling, biological processing, and reduction methods. Generation, utilization and disposal of waste is increasingly becoming a significant problem in many cities of the world, with an exploding world population estimated to have a global doubling time now less than twenty years. This research focuses on energy recovery as a viable

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18

Sun, Xiaohang, Zijun Sun, Yanbin Xin, Bing Sun, and Xiaomin Lu. "Plasma-catalyzed liquefaction of wood-based biomass." BioResources 15, no. 3 (2020): 6095–109. http://dx.doi.org/10.15376/biores.15.3.6095-6109.

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Biomass resources in nature produce a large amount of waste resources (agricultural residues, wood waste, etc.) during agricultural and forestry production processes. Therefore, the effective utilization of these solid biomass waste resources has attracted widespread interest. In this paper, a pulsed discharge plasma technology was used to perform catalytic liquefaction experiments on solid biomass sawdust at room temperature and atmospheric pressure, and the reaction parameters such as the solid:liquid ratio, liquefaction solvent ratio, and catalyst ratio were optimized. The results showed th

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19

Feng, Zhen, Jianmin Zhao, Jeff Rockwell, Dan Bailey, and Gerald Huffman. "Direct liquefaction of waste plastics and coliquefaction of coal-plastic mixtures." Fuel Processing Technology 49, no. 1-3 (1996): 17–30. http://dx.doi.org/10.1016/s0378-3820(96)01036-3.

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20

Zhang Xioabin, D. V. Miroshnichenko, A. G. Tulskaya, and E. V. Bogoyavlenskaya. "Disposal of Polymer Waste in Coal Coking." Coke and Chemistry 63, no. 12 (2020): 562–68. http://dx.doi.org/10.3103/s1068364x20120029.

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21

GOLIK, V. I., and O. G. BURDZIEVA. "WASTE-FREE TAILINGS DISPOSAL TECHNOLOGY ENRICHMENT OF DONBASS." News of the Tula state university. Sciences of Earth 3, no. 1 (2023): 163–76. http://dx.doi.org/10.46689/2218-5194-2023-3-1-163-176.

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The prospects of waste-free utilization of coal enrichment tailings are considered. The concept of radical utilization of coal production waste with their inclusion in the natural cycle is detailed. The prospects of a new technology of metal leaching in high-speed mills with mechanochemical activation of processes are evaluated. The recommended technology provides an increase in the profitability of coal mining and radically solves environmental issues.

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22

Du, Kun, Yufeng Zeng, and Ronghuan Qin. "Coliquefaction of coal-plastic mixtures by two-stage methods." Europub Journal of Exact and Engineering Research 3, no. 1 (2022): 107–15. http://dx.doi.org/10.54749/ejeerv3n1-003.

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The two-stage co-processing of coal with medium-density polyethylene (MDPE) was investigated using ammonium tetrathiomolybdate (ATTM) as a catalyst. The first-stage plastic pyrolysis carried out at 420 °C, 6.0 MPa hydrogen pressure and HZSM-5 as catalyst. The second-stage coal and MDPE co-liquefaction had been performed in a hydroprocessing unit at 430 °C and 6.0 MPa hydrogen pressure with ATTM catalyst. A competitive experiment was performed by the way of one stage co-liquefaction of coal with MDPE using ATTM as catalyst and tetraline as solvent. The aim of the experiments was to determine th

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23

Wang, Wenjia, Adam Gallacher, Karissa Jolley, Mitchell G. Nelson, and Eric Eddings. "Harnessing High-Density-Polyethylene-Derived Liquid as a Model Solvent for the Co-Liquefaction of Low-Rank Coals: Toward Sustainable Mesophase Pitch for Making High-Quality Carbon Fibers from Waste Plastics." Sustainability 17, no. 11 (2025): 4750. https://doi.org/10.3390/su17114750.

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The accumulation of polyolefin waste, particularly high-density polyethylene (HDPE), presents a growing environmental challenge due to limited recycling options and poor end-of-life recovery. This study explores a strategy to convert HDPE into mesophase pitch (MP), a valuable carbon precursor, by integrating polyolefin recycling with the mild solvolysis liquefaction (MSL) of low-rank coals. HDPE was first hydrogenolyzed into a hydrogen-rich aromatic liquid (HDPE-liquid), which was then used as the liquefaction solvent. Under identical conditions (400 °C, 60 min), Utah Sufco coal co-liquefied w

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24

Shen, Quanjun, Liang Fan, Yaohui Yang, et al. "Study on high temperature performance of coal based modified asphalt mixture." Advances in Engineering Technology Research 1, no. 3 (2023): 834. http://dx.doi.org/10.56028/aetr.3.1.834.

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SHA, as a solid waste from direct coal liquefaction, has a certain application prospect. Based on the original concept and process of coal based clean asphalt preparation, this paper studies the performance of SHA coal based modified asphalt mixture, and draws the following conclusions: (1) SHA modified asphalt has the characteristics of hard asphalt (2) Compared with traditional SBS modified asphalt mixture, SHA modified asphalt mixture has good high temperature performance (3) SHA modified asphalt mixture has small rutting rolling depth, which can improve the rutting resistance of asphalt pa

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25

Barraza Burgos, Juan Manuel, José Moreno, Fiderman Machuca Martínez, and Alberto Bolaños. "Thermal and catalytic coliquefaction of a Colombian coal with a low density polyethylene." Ingeniería e Investigación 30, no. 1 (2010): 22–27. http://dx.doi.org/10.15446/ing.investig.v30n1.15202.

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Thermal and catalytic co-liquefaction of coal with organic waste is aimed at increasing the process efficiency and decreasing its cost as the presence of organic waste can supply the hydrogen required for the reaction. Thermal and catalytic coliquefaction of coal from La Yolanda colliery with low density polyethylene waste (LDPE) was carried out using hydrogen-donor solvent (tetraline) and two catalysts (ruthenium chloride and nickel-molybdenum on aluminium). A batch reactor was used at 380°C, 400°C and 420°C. Results revealed greater than 90% conversion for thermal coliquefaction of coal/LDPE

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26

Song, Weijian, Jixiong Zhang, Meng Li, et al. "Underground Disposal of Coal Gangue Backfill in China." Applied Sciences 12, no. 23 (2022): 12060. http://dx.doi.org/10.3390/app122312060.

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China’s total coal production in 2021 exceeded 4.13 billion tons, 52% of the world’s total. Coal gangue, a solid waste of coal mining accounts for 15–20% of coal production, when directly discharged on the ground surface as waste heaps, it occupies large areas of land and cause environmental pollution. This paper summarizes the existing gangue backfilling methods, their working principles, efficiency, and application status. The methods that are meeting Middle and Western China’s mining demands are discussed in detail. The state-of-the-art technologies that can realize high-efficiency, central

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27

Rothenberger, Kurt S., Anthony V. Cugini, Robert L. Thompson, and Michael V. Ciocco. "Investigation of First-Stage Liquefaction of Coal with Model Plastic Waste Mixtures." Energy & Fuels 11, no. 4 (1997): 849–55. http://dx.doi.org/10.1021/ef9602077.

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28

Wang, Li, and Peng Chen. "Development of first-stage co-liquefaction of Chinese coal with waste plastics." Chemical Engineering and Processing: Process Intensification 43, no. 2 (2004): 145–48. http://dx.doi.org/10.1016/s0255-2701(03)00076-x.

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29

Zhang, Xinsha, Xudong Song, Jiaofei Wang, et al. "CO2 gasification of Yangchangwan coal catalyzed by iron-based waste catalyst from indirect coal-liquefaction plant." Fuel 285 (February 2021): 119228. http://dx.doi.org/10.1016/j.fuel.2020.119228.

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30

Wang, Qingyue, and Nuerjiamali Tuohedi. "Polyurethane Foams and Bio-Polyols from Liquefied Cotton Stalk Agricultural Waste." Sustainability 12, no. 10 (2020): 4214. http://dx.doi.org/10.3390/su12104214.

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Cotton is planted on a large scale in China, especially in the Xinjiang Region. A large amount of agricultural waste from cotton plants is produced annually, and currently poses a disposal problem. In this study the product after liquefaction of cotton stalk powder was mixed with diphenylmethane diisocyanate to prepare polyurethane foams. The effects of the liquefaction conditions on the properties of the polyols and polyurethane foams produced using cotton stalk were investigated. The optimal processing conditions for the liquefied product, considering the quality of the polyurethane foams, w

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31

Kray, Claudio Henrique, Marino José Tedesco, Carlos Alberto Bissani, Clesio Gianello, and Kelly Justin da Silva. "Tannery and coal mining waste disposal on soil." Revista Brasileira de Ciência do Solo 32, spe (2008): 2877–82. http://dx.doi.org/10.1590/s0100-06832008000700035.

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Tannery residues and coal mine waste are heavily polluting sources in Brazil, mainly in the Southern States of Rio Grande do Sul and Santa Catarina. In order to study the effects of residues of chrome leather tanning (sludge and leather shavings) and coal waste on soybean and maize crops, a field experiment is in progress since 1996, at the Federal University of Rio Grande do Sul Experimental Station, county of Eldorado do Sul, Brazil. The residues were applied twice (growing seasons 1996/97 and 1999/00). The amounts of tannery residues were applied according to their neutralizing value, at ra

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32

Leventhal, A. R., and L. P. de Ambrosis. "Waste disposal in coal mining—a geotechnical analysis." Engineering Geology 22, no. 1 (1985): 83–96. http://dx.doi.org/10.1016/0013-7952(85)90040-7.

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33

Yossifova, Mariana, Dimitrina Dimitrova, Lora Bidzhova, Olga Veleva, and Svetoslav V. Georgiev. "Mercury contents in Pernik coals and disposal pond waste products." Review of the Bulgarian Geological Society 85, no. 2 (2024): 207–10. https://doi.org/10.52215/rev.bgs.2024.85.2.207.

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Mercury contents in two types of Pernik coals and in mixed waste from coal preparation and combustion from a disposal pond were measured using direct mercury analyzer. Pearson correlation coefficients between Hg concentrations and ash content among different types of samples are statistically insignificant, suggesting predominantly organic affinity of Hg. The Hg content of 150 ppb in the fuel for the thermoelectric power station (low grade coal) slightly exceeds the world average for brown coals (100 ppb). Mercury concentrations in the mixed waste are twice lower than those in low grade coal,

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34

Wang, Zhao, and Jing Wei. "Discussion on Comprehensive Utilization and Ecological Management of Coal Gangue." Frontiers in Sustainable Development 3, no. 11 (2023): 84–89. http://dx.doi.org/10.54691/fsd.v3i11.5731.

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Coal production will continue to increase year by year, and the amount of waste discharged will also increase year by year. In addition, the amount of coal waste accumulated in the past is quite huge. In order to implement the concept of ecological civilization in the new era, reduce the atmospheric, water, and ecological environmental problems caused by the accumulation of coal gangue in the region, solve the safety and environmental risks of existing waste disposal sites, restore the ecological and environmental functions of waste disposal sites and surrounding areas, and improve the compreh

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35

Mohammed, Syakirah Afiza, Suhana Koting, Herda Yati Binti Katman, et al. "A Review of the Utilization of Coal Bottom Ash (CBA) in the Construction Industry." Sustainability 13, no. 14 (2021): 8031. http://dx.doi.org/10.3390/su13148031.

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One effective method to minimize the increasing cost in the construction industry is by using coal bottom ash waste as a substitute material. The high volume of coal bottom ash waste generated each year and the improper disposal methods have raised a grave pollution concern because of the harmful impact of the waste on the environment and human health. Recycling coal bottom ash is an effective way to reduce the problems associated with its disposal. This paper reviews the current physical and chemical and utilization of coal bottom ash as a substitute material in the construction industry. The

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36

Ramos, Ana. "CONSIDERATIONS ON WASTE CHARACTERIZATION AND THE PRODUCTION OF ENERGY: HOW USEFUL CAN WASTE BE?" Volume 24 - September 2023, no. 24 (September 30, 2023): 3–12. http://dx.doi.org/10.31025/2611-4135/2023.18314.

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The proposed work reports a compilation of municipal solid waste composition in several geographies, discussing the impacts and repercussions of different waste classification nomenclature and related definitions. In addition, different scenarios are evaluated using the average waste composition in each location to further describe the possibility of covering the energy demand in those places, with energy produced from waste. For that, the thermal conversion efficiency of each Waste-to-Energy (WtE) procedure (combustion, incineration, hydrothermal liquefaction, pyrolysis, gasification, and pla

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37

Li, Xiao, Xiaodong Tian, Tao Yang, et al. "Coal Liquefaction Residues Based Carbon Nanofibers Film Prepared by Electrospinning: An Effective Approach to Coal Waste Management." ACS Sustainable Chemistry & Engineering 7, no. 6 (2019): 5742–50. http://dx.doi.org/10.1021/acssuschemeng.8b05210.

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38

Petropavlovskaya, V. B., S. V. Artamonova, E. O. Shchipanskaya, E. A. Ratkevich, and K. S. Petropavlovskii. "Environmental management in ash and slag waste management in Russia." IOP Conference Series: Earth and Environmental Science 1010, no. 1 (2022): 012135. http://dx.doi.org/10.1088/1755-1315/1010/1/012135.

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Abstract The article provides a comprehensive assessment of environmental management in waste management: environmental pollution due to an increase in waste disposal volumes, operation of environmentally hazardous waste, ash deposition, a low level of involvement of recycled waste disposal sites as a valuable secondary resource in economic circulation. The process of processing ash waste from coal-fired TPPs has been investigated as an aspect of environmental safety. Today’s planners are working to develop a waste management strategy for waste ash from coal-fired power plants in order to find

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39

Dychkovskyi, Roman, Volodymyr Falshtynskyi, Pavlo Saik, and Vasyl Lozynskyi. "Aspects of co-utilization of solid waste and coal through underground gasification." IOP Conference Series: Earth and Environmental Science 1457, no. 1 (2025): 012002. https://doi.org/10.1088/1755-1315/1457/1/012002.

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Abstract The Well-Based Underground Coal Gasification (WUCG) technology is developed to enable the co-gasification of coal with industrial and household waste directly within coal seams, allowing for efficient disposal of thermally treated solid residues in the gasified voids of the underground gas generator. This approach aims to create a closed-loop system for energy-chemical enterprises, enhancing both process safety and overall efficiency. Through detailed research, technological schemes and optimized operational parameters have been established for the thermochemical co-processing of coal

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40

Sharma, Ramesh K., Jianli Yang, John W. Zondlo, and Dady B. Dadyburjor. "Effect of process conditions on co-liquefaction kinetics of waste tire and coal." Catalysis Today 40, no. 4 (1998): 307–20. http://dx.doi.org/10.1016/s0920-5861(98)00060-1.

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41

Sugano, Motoyuki, Daigorou Onda, and Kiyoshi Mashimo. "Additive Effect of Waste Tire on the Hydrogenolysis Reaction of Coal Liquefaction Residue." Energy & Fuels 20, no. 6 (2006): 2713–16. http://dx.doi.org/10.1021/ef060193x.

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42

Wickland, Benjamin E., G. Ward Wilson, Dharma Wijewickreme, and Bern Klein. "Design and evaluation of mixtures of mine waste rock and tailings." Canadian Geotechnical Journal 43, no. 9 (2006): 928–45. http://dx.doi.org/10.1139/t06-058.

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The technique of mixing mine waste rock and tailings for disposal has the potential to avoid the problems of acid rock drainage and tailings liquefaction. This paper presents a rational basis for the design of mixtures based on particle packing theory and laboratory investigations. Mixtures were conceptualized using a particle model that allows mixture design and interpretation of behaviour. Laboratory investigations included examination of tailings rheology, mixture trials, and compressibility testing of waste rock, tailings, and mixtures of waste rock and tailings. Results indicate that mixt

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43

Golik, V. I. "TO THE PROBLEM OF DEEP WASTE DISPOSAL COAL ENRICHMENT." Ugol', no. 05 (May 8, 2025): 56–59. https://doi.org/10.18796/0041-5790-2025-5-56-59.

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44

Devgun, J. S. "Suitability of unconsolidated sediments for hosting low-level radioactive waste disposal facilities." Canadian Journal of Civil Engineering 16, no. 4 (1989): 560–67. http://dx.doi.org/10.1139/l89-086.

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Among the unconsolidated sediments, sand deposits are considered a rather unconventional geologic host medium for siting radioactive waste repositories, the clays being the preferred choice. A closer examination of the various geologic media, however, shows that in each case there are advantages and disadvantages. The key to safe and cost-effective disposal is to match the engineered design of the facility to the site's characteristics as well as the nature of the waste to be disposed of. In humid climates, free-draining sediments such as sand can provide the advantage of eliminating concern r

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45

Hendryx, Michael, Keith J. Zullig, and Juhua Luo. "Impacts of Coal Use on Health." Annual Review of Public Health 41, no. 1 (2020): 397–415. http://dx.doi.org/10.1146/annurev-publhealth-040119-094104.

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This article reviews evidence for the public health impacts of coal across the extraction, processing, use, and waste disposal continuum. Surface coal mining and processing impose public health risks on residential communities through air and water pollution. Burning coal in power plants emits more nitrogen oxides, sulfur dioxide, particulate matter, and heavy metals per unit of energy than any other fuel source and impairs global public health. Coal ash disposal exposes communities to heavy metals and particulate matter waste. Use of coal in domestic households causes public health harm conce

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46

Liang, Lingyun, Zhihuai Mao, Yebo Li, et al. "Liquefaction of crop residues for polyol production." BioResources 1, no. 2 (2006): 248–56. http://dx.doi.org/10.15376/biores.1.2.248-256.

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The liquefaction of crop residues in the presence of ethylene glycol, ethylene carbonate, or polyethylene glycol using sulfuric acid as a catalyst was studied. For all experiments, the liquefaction was conducted at 160 ° C and atmospheric pressure. The mass ratio of feedstock to liquefaction solvents used in all the experiments was 30:100. The results show that the acid catalyzed liquefaction process fit a pseudo-first-order kinetics model. Liquefaction yields of 80, 74, and 60% were obtained in 60 minutes of reaction when corn stover was liquefied with ethylene glycol, a mixture of polyethyle

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47

He, Ruimin, Pengfei Cao, Yuhang Chen, Kai Zhang, and Wen Li. "Research and Application of Harmless Disposal and Landfill Technology of Coal Gangue Waste in Shendong Mining Area." Journal of Physics: Conference Series 2941, no. 1 (2025): 012076. https://doi.org/10.1088/1742-6596/2941/1/012076.

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Abstract Shendong mining area is one of the important coal production bases in China. As a by-product in the process of coal mining, a large accumulation of coal gangue not only occupies land but also causes serious pollution to the environment. In order to solve the problem of coal gangue waste in Shendong mining area as the starting point, the research studies the harmless disposal and landfill technology, aiming to realize the resource utilization and environmentally friendly treatment of coal gangue. First, the physical and chemical properties of gangue, including its composition, structur

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Kutepov, Yuriy, Aleksandr Mironov, Maksim Sablin, and Elena Borger. "Substantiation of Safe Conditions During Undermining of Hydraulic Waste Disposal." E3S Web of Conferences 41 (2018): 01007. http://dx.doi.org/10.1051/e3sconf/20184101007.

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This article considers mining and geological conditions of the site “Blagodatny” of the mine named after A.D. Ruban located underneaththe old open pit coal mine and the hydraulic-mine dump. The potentially dangerous zones in the undermined rock mass have been identified based onthe conditions of formation of water inflow into mine workings. Safe depthof coal seams mining has been calculated depending on the type of water body – the hydraulic-mine dump.

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Munawar, Mufid, Bambang Purwanggono Sukarsono, and Singgih Saptadi. "Risk Mangement Study of Solid Waste Disposal Construction Project to Improve Project Performance(Case Study: 2 X 1000 Steam Power Plant Project)." CENDEKIA : Jurnal Penelitian dan Pengkajian Ilmiah 1, no. 1 (2023): 25–38. http://dx.doi.org/10.62335/j8a2e777.

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The construction project of a coal-fired steam power plant, of course, takes into account the problem of waste (coal ash), therefore it is necessary to plan for a place to store solid waste remaining from combustion (Solid Waste Disposal). Disposal of solid waste is a useful waste storage area to prevent pollution to the surrounding environment. The construction of solid waste disposal consists of embankments and ponds, in its construction it is necessary to consider the risks that will occur, so as to minimize the impact that will be caused, in terms of cost, time and quality. This study aims

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Amaral Filho, Juarez R. do, Msimelelo Gcayiya, Athanasios Kotsiopoulos, Jennifer L. Broadhurst, David Power, and Susan T. L. Harrison. "Valorization of South African Coal Wastes through Dense Medium Separation." Minerals 12, no. 12 (2022): 1519. http://dx.doi.org/10.3390/min12121519.

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Sustainable management of coal waste is one of the major environmental concerns for coal mining, whether active or legacy, worldwide. Coal dump deposits demand a large physical area or footprint for disposal of solid waste, change the topography, and generate both pyritic dust and acid rock drainage (ARD) where pyritic coal waste is deposited. The beneficiation of dump deposits or, preferably, of coal waste prior to its dumping can reduce or even eliminate the liabilities related to coal waste management. In this work, dense medium separation studies of coal discards, using heavy liquids, resu

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