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Effective Removal of Moisture and Ash from Coal Tar 有效去除煤焦油中的水分和灰分
IF 0.5
Coke and Chemistry Pub Date : 2025-07-04 DOI: 10.3103/S1068364X25600393
A. V. Sablin, E. O. Savina, E. A. Milenina
{"title":"Effective Removal of Moisture and Ash from Coal Tar","authors":"A. V. Sablin,&nbsp;E. O. Savina,&nbsp;E. A. Milenina","doi":"10.3103/S1068364X25600393","DOIUrl":"10.3103/S1068364X25600393","url":null,"abstract":"<p>The influence of oxyethylated alkyl phenol (Neonol AF<sub>9–10</sub>) on the clarification of coal tar in mechanized settling tanks is considered. Adding Neonol is found to increase the deposition rate of tar sludge. If Neonol is present in the wastewater sent to the biochemical treatment plant, its operation is not significantly affected. The use of Neonol in the separation of water–tar mixtures decreases the content of tarry impurities. Ash removal from tar in mechanized settling tanks may be intensified by adding Neonol, with decrease in the rate at which sediment builds up in tar stores. The stability of water–tar emulsions declines on adding Neonol. On the basis of these results, the use of Neonol may be recommended to stabilize the quality of coal tar.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 3","pages":"228 - 237"},"PeriodicalIF":0.5,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Improved Coking Coal Flotation with Vinyl Pyridine–Alkyl Sulfoxide Copolymers as Modifiers 乙烯基吡啶-烷基亚砜共聚物改性焦煤浮选
IF 0.5
Coke and Chemistry Pub Date : 2025-07-04 DOI: 10.3103/S1068364X25600411
V. N. Petukhov, T. G. Voloshchuk
{"title":"Improved Coking Coal Flotation with Vinyl Pyridine–Alkyl Sulfoxide Copolymers as Modifiers","authors":"V. N. Petukhov,&nbsp;T. G. Voloshchuk","doi":"10.3103/S1068364X25600411","DOIUrl":"10.3103/S1068364X25600411","url":null,"abstract":"<p>Coal flotation when using copolymers of vinylpyridine and alkyl sulfoxides as modifiers is investigated. When the modifiers are added to coal fines at a rate of 0.5–1.0 g/t, the flotation parameters are improved: more combustible coal mass is extracted with the concentrate; and less of the coal’s organic mass is lost with the flotation waste. The effectiveness of the modifier is determined by the quantity of sulfo groups and vinylpyridine groups in the macromolecule and also by its molecular mass. The flotation is best when using 50B modifier with molecular mass 17 500 and an increased sulfo group content in the macromolecule. The modifier is more effective when it is introduced in the flotation chamber before the collector. The flotation is improved because modifier molecules are adsorbed at the energetically active sections of the coal surface. Specifically, polar groups of the copolymer are attached by hydrogen bonds, with the hydrocarbon groups oriented into the aqueous phase. That ensures increase in hydrophobic properties of the coal before the collector is added. As a result, lower consumption of the collector is possible.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 3","pages":"243 - 251"},"PeriodicalIF":0.5,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Properties of Anthracite-Based Sorbent before and after Ferrous Ion Sorption 无烟煤基吸附剂吸附亚铁离子前后的性能
IF 0.5
Coke and Chemistry Pub Date : 2025-07-04 DOI: 10.3103/S1068364X2560040X
N. V. Gora, O. V. Belyaeva, D. A. Chernyshoyv
{"title":"Properties of Anthracite-Based Sorbent before and after Ferrous Ion Sorption","authors":"N. V. Gora,&nbsp;O. V. Belyaeva,&nbsp;D. A. Chernyshoyv","doi":"10.3103/S1068364X2560040X","DOIUrl":"10.3103/S1068364X2560040X","url":null,"abstract":"<p>The texture and surface state of Purolat Standard sorbent are studied before and after the sorption of ferrous ions from aqueous solutions, by various instrumental methods. The presence of iron at the surface largely affects the sorbent’s organic compound. The extraction of iron is accompanied by partial destruction of the sorbent surface, possibly as a result of both the oxidation of amorphous carbon and the conversion of phenol and simple ester groups to carboxyl groups. The adsorption of iron ions may occur mainly by ion exchange but also by complex formation with groups at the carbon surface. IR spectroscopy suggests that the ferrous ions are adsorbed at the surface in the form of hydrated complexes.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 3","pages":"238 - 242"},"PeriodicalIF":0.5,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spectral Analysis of Humic and Fulvic Acids from Unoxidized and Oxidized Coal 未氧化和氧化煤中腐植酸和黄腐酸的光谱分析
IF 0.5
Coke and Chemistry Pub Date : 2025-07-04 DOI: 10.3103/S1068364X25600332
K. S. Votolin, S. I. Zherebtsov, K. M. Shpakodraev
{"title":"Spectral Analysis of Humic and Fulvic Acids from Unoxidized and Oxidized Coal","authors":"K. S. Votolin,&nbsp;S. I. Zherebtsov,&nbsp;K. M. Shpakodraev","doi":"10.3103/S1068364X25600332","DOIUrl":"10.3103/S1068364X25600332","url":null,"abstract":"<p>Spectral analysis is employed to compare oxidized and unoxidized coal samples and the humic acids and fulvic acids derived from them. Differences between naturally oxidized and unoxidized coal samples include increased yield of volatiles and humic materials; higher content of analytical moisture, ash. and moisture, and higher total content of oxygen, nitrogen, and sulfur (O + N + S); but lower carbon content. The greatest yield of humic materials is observed for oxidized 1B and 2B lignite (70.5%, consisting of 60.9% humic acids and 9.6% fulvic acids). The yield of humic materials is also high for oxidized long-flame D coal (42.4%, consisting of 34.8% humic acids and 7.6% fulvic acids). The yield of humic materials from G coal is minimal: no more than 0.7%. According to Fourier transform infrared (FTIR) spectra and CP/MAS <sup>13</sup>C nuclear magnetic resonance (NMR) spectra, the structural group composition of the humic acids is largely determined by the composition of the initial coal. The content of aromatic structure <i>f</i><sub>ar</sub> and the hydrophilic/hydrophobic balance <i>f</i><sub>h/h</sub> calculated from the <sup>13</sup>C NMR spectra for the coal samples and humic acids are directly related (<i>R</i><sup>2</sup> = 0.71 and <i>R</i><sup>2</sup> = 0.81, respectively). The structural group composition of the fulvic acids is largely unaffected by the composition of the initial coal and is more uniform. Overall, <i>f</i><sub>h/h</sub> is higher for oxidized coal than for the corresponding unoxidized coal. The humic acids have a larger content of carbon and aromatic fragments. The fulvic acids have a larger content of oxygen-bearing aliphatic groups. The elemental composition and structural group composition of the humic and fulvic acids from oxidized G and D coal samples are comparable with those for the lignite samples.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 3","pages":"185 - 196"},"PeriodicalIF":0.5,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Regasification of Liquefied Natural Gas Based on the Rankine Cycle: Thermodynamic Analysis 基于朗肯循环的液化天然气再气化：热力学分析
IF 0.5
Coke and Chemistry Pub Date : 2025-07-04 DOI: 10.3103/S1068364X25600435
V. A. Naletov, D. Zh. Abdillaeva, M. B. Glebov, A. Yu. Naletov
{"title":"Regasification of Liquefied Natural Gas Based on the Rankine Cycle: Thermodynamic Analysis","authors":"V. A. Naletov,&nbsp;D. Zh. Abdillaeva,&nbsp;M. B. Glebov,&nbsp;A. Yu. Naletov","doi":"10.3103/S1068364X25600435","DOIUrl":"10.3103/S1068364X25600435","url":null,"abstract":"<p>Options for organizing the regasification of liquefied natural gas (LNG) with the Rankine cycle are compared, with a view to more effective use of the cold energy of the liquefied gas. The comparison is based on exergy efficiency: the ratio of the total thermal inlet and outlet exergy for the system. In calculating the thermal characteristics of the flow, components of thermal exergy that don't change are discarded. ChemCad software is used for computational experiments. In organizing the regasification of liquefied natural gas (LNG) with the Rankine cycle, the heat source employed is seawater or flue gas at the output of turbine-based thermal power systems. When using environmental resources (seawater) at marine terminals, the efficiency of regasification proves higher than when using flue gas. However, the power generated in the Rankine cycle is 2.4 times greater when using flue gas. In addition, when using the residual heat of the flue gas, the heat pollution of the environment may be significantly reduced. All in all, the use of flue gas can be more economically viable.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 3","pages":"258 - 262"},"PeriodicalIF":0.5,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Comparison of Coal-Based Carbon Substrates for Nanostructured Metallic Particles 纳米结构金属颗粒的煤基碳衬底比较
IF 0.5
Coke and Chemistry Pub Date : 2025-07-04 DOI: 10.3103/S1068364X25600423
A. N. Popova, N. S. Zakharov, G. Y. Simenyuk, V. G. Dodonov
{"title":"Comparison of Coal-Based Carbon Substrates for Nanostructured Metallic Particles","authors":"A. N. Popova,&nbsp;N. S. Zakharov,&nbsp;G. Y. Simenyuk,&nbsp;V. G. Dodonov","doi":"10.3103/S1068364X25600423","DOIUrl":"10.3103/S1068364X25600423","url":null,"abstract":"<p>The prospects for using carbon substrates produced by the high-temperature (800°C) alkaline (KOH) activation of A and D coal and sapropelic coal are considered. Active particles are subsequently applied to the surface of the carbon substrates so as to obtain functional materials. The results of IR spectroscopy and technical analysis, as well as differential scanning calorimetry, indicate that the carbon substrates produced from D coal are the most promising. The presence of numerous –OH and –C=O groups in that case facilitates the reduction of metals at the carbonized surface, and hence the active particles at its surface are more disperse.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 3","pages":"252 - 257"},"PeriodicalIF":0.5,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Chemical Synthesis and Characterization of Fly Ash-Based Mineral Polymers 粉煤灰基矿物聚合物的化学合成与表征
IF 0.5
Coke and Chemistry Pub Date : 2025-07-04 DOI: 10.3103/S1068364X25600137
Simon Judes Sujatha, Victor Rajasekaran Ruban Daniel, Anandakumar Daisy Sheena
{"title":"Chemical Synthesis and Characterization of Fly Ash-Based Mineral Polymers","authors":"Simon Judes Sujatha,&nbsp;Victor Rajasekaran Ruban Daniel,&nbsp;Anandakumar Daisy Sheena","doi":"10.3103/S1068364X25600137","DOIUrl":"10.3103/S1068364X25600137","url":null,"abstract":"<p>The synthesis of mineral polymer materials from fly ash offers a sustainable utilization strategy. This study employed a sol−gel method to prepare silica-alumina precursors, investigating the effects of synthesis parameters such as silicon and aluminum sources, temperature, Si/Al ratio, and ethanol dosage. Structural and physicochemical properties were analyzed using XRD, SEM, TG, and IR spectroscopy. Optimal conditions were identified at a Si/Al ratio of 10 : 1, a synthesis temperature of 60°C, and calcination at 750°C for 3 h, achieving a maximum synthesis efficiency of 81.33%. XRD confirmed an amorphous phase with a grid-like structure, while IR analysis revealed Si–O–Si bonding and characteristic absorption peaks at 806 and 1395 cm<sup>–1</sup>, indicating incomplete reactions. SEM imaging showed uniform, fine particles. These findings enhance the understanding of silica-alumina precursor synthesis, providing insights for their application in advanced materials.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 3","pages":"283 - 297"},"PeriodicalIF":0.5,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Aluminosilicate Gel Formation in Alkali-Activated Fly Ash: An NMR Spectroscopic Study 碱活化粉煤灰中铝硅酸盐凝胶的形成：核磁共振光谱研究
IF 0.5
Coke and Chemistry Pub Date : 2025-07-04 DOI: 10.3103/S1068364X25600198
Simon Judes Sujatha, Victor Rajasekaran Ruban Daniel, Thanga Jebarsan, Anandakumar Daisy Sheena
{"title":"Aluminosilicate Gel Formation in Alkali-Activated Fly Ash: An NMR Spectroscopic Study","authors":"Simon Judes Sujatha,&nbsp;Victor Rajasekaran Ruban Daniel,&nbsp;Thanga Jebarsan,&nbsp;Anandakumar Daisy Sheena","doi":"10.3103/S1068364X25600198","DOIUrl":"10.3103/S1068364X25600198","url":null,"abstract":"<p>This study investigates the impact of a CO<sub>2</sub>-rich environment on the aluminosilicate gel in alkali-activated fly ash (AAAFA) using NMR spectroscopy. After 24 h of curing at 80°C, the AAAFA samples were exposed to a 10% ambient CO<sub>2</sub> concentration. Highly reactive elements such as Na and Al fully reacted within the initial hours and remained unaffected by carbonation under high CO<sub>2</sub> levels. However, Si, which reacts more slowly, exhibited distinct behaviour. Monomeric silicates rapidly polymerized despite the carbonated sample showing a lower overall reaction extent. This indicates the formation of a binding gel phase due to intense CO<sub>2</sub> exposure, leading to an increased gel content in the carbonated sample. These findings enhance the understanding of aluminosilicate gel chemistry and behavior under elevated CO<sub>2</sub> concentrations, providing insights into the long-term performance of alkali-activated materials in carbon-rich environments.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 3","pages":"313 - 320"},"PeriodicalIF":0.5,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Oil-Free Combustion of Coal in a Cyclone Furnace 旋流炉中煤的无油燃烧
IF 0.5
Coke and Chemistry Pub Date : 2025-06-01 DOI: 10.3103/S1068364X25600265
V. I. Golik, R. Yu. Israilov, N. Yu. Plyushchenko
{"title":"Oil-Free Combustion of Coal in a Cyclone Furnace","authors":"V. I. Golik,&nbsp;R. Yu. Israilov,&nbsp;N. Yu. Plyushchenko","doi":"10.3103/S1068364X25600265","DOIUrl":"10.3103/S1068364X25600265","url":null,"abstract":"<p>Fuel economy in boilers is an urgent concern. Coal combustion with fuel oil is currently employed for that purpose, but this approach impairs electricity generation and releases oxides of sulfur and nitrogen into the environment. An alternative is oil-free combustion with plasma activation of the coal. Preliminary plasma activation results in more efficient combustion in the absence of fuel oil. The effectiveness of this technology is confirmed by familiar methods: engineering analysis, economic assessment, elaboration of a theory, experimental testing, and formulation of recommendations for optimizing the technology. The influence of plasma activation on the coal combustion is studied. The resulting technology for thermal preparation and combustion of coal in a cyclone furnace is an alternative to combustion with fuel oil in industrial boilers. The design of the system for regulating combustion with partial gasification of the working fuel is improved. Using this technology, it proves possible to use low-grade coal as the fuel. The emission of nitrogen oxides is decreased, and boiler performance is improved. Oil-free fuel combustion in a cyclone furnace is promising for use in power generation. It is shown that coal combustion with chemical activation or high-temperature plasma activation may be used in modernizing or constructing thermal power stations.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 2","pages":"121 - 125"},"PeriodicalIF":0.5,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145160572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Prospects for Coal Mining in Kemerovo Oblast 克麦罗沃州煤炭开采前景
IF 0.5
Coke and Chemistry Pub Date : 2025-06-01 DOI: 10.3103/S1068364X25600277
R. S. Gubanov
{"title":"Prospects for Coal Mining in Kemerovo Oblast","authors":"R. S. Gubanov","doi":"10.3103/S1068364X25600277","DOIUrl":"10.3103/S1068364X25600277","url":null,"abstract":"<p>In considering the dynamics and structure of coal production at the largest Russian mining companies, their financial and economic position is analyzed. Priorities for the development of coal mining in Kemerovo oblast are determined. Problems are also identified, including the industry’s significant environmental impact. The consolidated budget of Kemerovo oblast shows large financial losses. The numerous economic and environmental factors responsible for the poor performance of the coal industry are noted, including decreased coal exports due to international sanctions; significant fiscal support for large coal companies, with low return on the infrastructure projects concentrated in the hands of small and medium companies; and violation of environmental standards for coal mining, with colossal financial penalties to mining companies that lack treatment facilities. A system is proposed for the state support of coal mining in Kemerovo oblast so as to stimulate stable growth of coal output, to introduce innovative projects at state mining enterprises in the Kuznetsk Basin, and to support and manage infrastructure projects in the regional coal industry with an emphasis on risk-oriented technologies.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 2","pages":"126 - 130"},"PeriodicalIF":0.5,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145160573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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