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Spontaneous Combustion of Coal Enrichment Waste 煤富集废弃物的自燃研究
IF 0.5
Coke and Chemistry Pub Date : 2025-09-21 DOI: 10.3103/S1068364X25600708
V. A. Portola, S. I. Protasov, A. A. Bobrovnikova, E. A. Kirenberg
{"title":"Spontaneous Combustion of Coal Enrichment Waste","authors":"V. A. Portola,&nbsp;S. I. Protasov,&nbsp;A. A. Bobrovnikova,&nbsp;E. A. Kirenberg","doi":"10.3103/S1068364X25600708","DOIUrl":"10.3103/S1068364X25600708","url":null,"abstract":"<p>The ability of some samples of coal enrichment waste to adsorb oxygen is investigated. The incubation period of self-ignition (spontaneous combustion) is determined, as well as the likelihood of self-ignition of coal-bearing rock. Some of the samples are susceptible to spontaneous combustion and their presence in tailings heaps may result in endogenous fires. Self-ignition of coal slurry is unusual because of its high moisture content. However, laboratory research shows that slurry may rapidly lose moisture in summer, and the incubation period is significantly shortened. That may lead ultimately to spontaneous combustion hot spots. To prevent endogenous fires, the incubation period must be determined for coal enrichment waste in rock tailings.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 6","pages":"509 - 514"},"PeriodicalIF":0.5,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090598","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
Low-Temperature Oxidation of Coal Tar Pitch in a Thin Layer 薄层煤沥青低温氧化研究
IF 0.5
Coke and Chemistry Pub Date : 2025-09-21 DOI: 10.3103/S1068364X25600757
R. Yu. Kovalev, A. P. Nikitin
{"title":"Low-Temperature Oxidation of Coal Tar Pitch in a Thin Layer","authors":"R. Yu. Kovalev,&nbsp;A. P. Nikitin","doi":"10.3103/S1068364X25600757","DOIUrl":"10.3103/S1068364X25600757","url":null,"abstract":"<p>Coal tar pitch is derived from coal tar. It is used as a binder for electrodes and anode mass. It is mainly produced as the &lt;360°C fraction in the distillation of coal tar. However, the coal tar pitch obtained by this means does not always meet the requirements for binder pitch. It may be characterized by low softening point and insufficient content of binder fractions (β and α<sub>2</sub>). Thermal oxidation is used to improve pitch quality. The present article describes experiments on the oxidation of low-temperature pitch (59°C) produced by the distillation of coal tar (from EVRAZ ZSMK) and medium-temperature grade B electrode pitch (71°C) in a thin layer. Such oxidation is not often used and requires further investigation. Thermal oxidation in a thin layer is studied on laboratory apparatus in a 4-L reactor. Air is supplied by a pipe of 9-mm diameter. The mass of the pitch samples is selected so that they sit in a thin layer on the reactor floor. The range of oxidation temperature is 260–300°C. The rate of air supply is 4800 L/kg h for low-temperature pitch and 2400 L/kg h for medium-temperature grade B electrode pitch. The oxidation product (pitch) is collected. The pitch yield, its softening temperature, and its content of components insoluble in toluene and quinoline are determined. The fractional composition of the oxidation products is analyzed. The products are compared with the initial pitch samples. For medium-temperature grade B electrode pitch, the dependence of the softening point and fractional composition of the oxidation products on the duration of oxidation is considered. The conditions in which the content of the α<sub>1</sub> fraction may increase on low-temperature oxidation are identified. The increase in the content of α<sub>2</sub> and α<sub>1</sub> fractions in the oxidation products is estimated. It is found that oxidation in a thin layer increases the yield of carbonized pitch. For the given pitch samples, the yield of carbonized pitch–coke mixture is higher than the yield of carbonized pitch–coke mixture based on grade C electrode pitch.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 6","pages":"549 - 555"},"PeriodicalIF":0.5,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090532","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
Interaction of Copper and Lead Cations with Residues Derived from Lignite 铜、铅阳离子与褐煤残渣的相互作用
IF 0.5
Coke and Chemistry Pub Date : 2025-09-21 DOI: 10.3103/S1068364X2560071X
S. I. Zherebtsov, N. V. Malyshenko, K. S. Votolin, K. M. Shpakodraev
{"title":"Interaction of Copper and Lead Cations with Residues Derived from Lignite","authors":"S. I. Zherebtsov,&nbsp;N. V. Malyshenko,&nbsp;K. S. Votolin,&nbsp;K. M. Shpakodraev","doi":"10.3103/S1068364X2560071X","DOIUrl":"10.3103/S1068364X2560071X","url":null,"abstract":"<p>The coal residues (CR) obtained after the removal of humic matter from lignite is characterized by infrared (IR), nuclear magnetic resonance (NMR), and electron paramagnetic resonance (EPR). The structural groups present in the residues differ from those in the initial lignite. The sorption of copper and lead cations by the coal residues is studied. The sorptional capacity of the residues is greater for copper than for lead. Two mechanisms are involved in the interaction of the residues with copper and lead cations: ion exchange of the metal cations for protons of the carboxyl groups; and complex formation. The ligands involved may be oxygen-bearing structural groups such as carboxyl and phenol hydroxyl groups.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 6","pages":"515 - 521"},"PeriodicalIF":0.5,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090516","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
Nanostructured Supercapacitor Electrode Composites Derived from Carbonized Sapropelic Coal Filled with Cobalt(II, III) Oxide Nanoparticles 炭化腐泥煤填充钴（II， III）氧化物纳米颗粒制备的纳米结构超级电容器电极复合材料
IF 0.5
Coke and Chemistry Pub Date : 2025-09-21 DOI: 10.3103/S1068364X25600733
N. S. Zakharov, N. M. Federova, T. A. Larichev, G. Yu. Simenyuk, R. S. Parshkov, I. Yu. Zykov, A. P. Nikitin
{"title":"Nanostructured Supercapacitor Electrode Composites Derived from Carbonized Sapropelic Coal Filled with Cobalt(II, III) Oxide Nanoparticles","authors":"N. S. Zakharov,&nbsp;N. M. Federova,&nbsp;T. A. Larichev,&nbsp;G. Yu. Simenyuk,&nbsp;R. S. Parshkov,&nbsp;I. Yu. Zykov,&nbsp;A. P. Nikitin","doi":"10.3103/S1068364X25600733","DOIUrl":"10.3103/S1068364X25600733","url":null,"abstract":"<p>The optimal time for applying 1 M nitric acid solution to carbonized sapropelic coal that is intended for use in supercapacitor electrodes is determined: modification for 10 min at 100°C is required. This approach increases the specific capacitance of the resulting electrode material by 20%, on average, with different potential scanning rates. Sorption measurements establish that modification of the carbonizate by nitric acid increases the mean mesopore size. In turn, in the production of Co<sub>3</sub>O<sub>4</sub>/C nanocomposite by an absorption method, with subsequent thermal decomposition of the precursor—cobalt(II) nitrate—at the surface and within the pores of the carbonizate, the optimal time for modification of the carbon matrix by nitric acid is 15 min at 100°C. The specific capacitance of the resulting nanocomposite is ~359 F/g. That is 1.25 times the value for the initial electrode material.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 6","pages":"535 - 540"},"PeriodicalIF":0.5,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090531","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
Effect of Microwave Radiation on the Microstructure of Coking Coal Samples 微波辐射对焦煤样品显微结构的影响
IF 0.5
Coke and Chemistry Pub Date : 2025-09-21 DOI: 10.3103/S1068364X25600691
Ze Pang, Qing Hai Pang, Fei Peng, Xian Ping Zhang, Zi Qing Xie, Gang Dong
{"title":"Effect of Microwave Radiation on the Microstructure of Coking Coal Samples","authors":"Ze Pang,&nbsp;Qing Hai Pang,&nbsp;Fei Peng,&nbsp;Xian Ping Zhang,&nbsp;Zi Qing Xie,&nbsp;Gang Dong","doi":"10.3103/S1068364X25600691","DOIUrl":"10.3103/S1068364X25600691","url":null,"abstract":"<p>In order to study the effect of microwave reforming process on the organic functional group structure (the way of organic combination of elements such as C, H and O) and carbon structure (carbon orderliness, microcrystalline structure, etc.) of different coking coals. Pre-treatment of coking coal (100, 200, 300 W) was carried out by 100s radiation treatment at different power, and the temperature was controlled below 200°C to prevent the coking coal from cracking. The functional group structure and carbon structure of coking coal before and after microwave treatment were analyzed using infrared spectroscopy, Raman spectroscopy methods. The results showed that with the prolongation of the microwave radiation treatment time, the overall trend of aroma fa first decreased, then increased and then decreased. The variation of DOC, the degree of aromatic ring polymerisation, varied considerably from one coal sample to another, and the ratio of the length of the main chain of the aliphatic chain to the length of the branched chain, <i>A</i>(CH<sub>2</sub>)/<i>A</i>(CH<sub>3</sub>), showed a <i>U</i>- or <i>W</i>-shaped variation. The oxygen-containing functional group structural parameter C' shows an overall increasing trend. The peak position difference PG-D between the D and G peaks ended up showing an overall decreasing trend, and the area ratio <i>I</i><sub>D</sub>/<i>I</i><sub>G</sub> between the D and G peaks showed a decreasing trend or the final result was basically the same as the beginning. The physical and chemical properties of coking coal were elucidated to characterize the reactive carbonaceous base point during the gasification reaction and to provide basic theoretical support for the preparation of low reactivity-high quality coke.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 6","pages":"564 - 576"},"PeriodicalIF":0.5,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090533","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
List of Atmospheric Pollutants Emitted by Coke Plants 焦化厂排放的大气污染物一览表
IF 0.5
Coke and Chemistry Pub Date : 2025-09-21 DOI: 10.3103/S1068364X25600769
V. T. Stefanenko, M. I. Tkachenko, A. V. Vasilyev, L. V. Vasilyeva
{"title":"List of Atmospheric Pollutants Emitted by Coke Plants","authors":"V. T. Stefanenko,&nbsp;M. I. Tkachenko,&nbsp;A. V. Vasilyev,&nbsp;L. V. Vasilyeva","doi":"10.3103/S1068364X25600769","DOIUrl":"10.3103/S1068364X25600769","url":null,"abstract":"<p>The air pollutants emitted in coke production that must be regulated and monitored are determined. The analysis is based on the characteristics of the equipment in the main production shops and departments, taking account of the physicochemical transformations of the coal and existing information regarding the sources of atmospheric emissions.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 6","pages":"556 - 563"},"PeriodicalIF":0.5,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090597","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
Composition of Distillates from Coal Extracts Derived by Solution in Processing Byproducts 加工副产物中煤萃取物溶液馏出物的组成
IF 0.5
Coke and Chemistry Pub Date : 2025-09-21 DOI: 10.3103/S1068364X25600745
V. A. Safin, P. N. Kuznetsov, B. Avid, L. I. Kuznetsova, T. Yu. Ivanenko, A. A. Vorobeva
{"title":"Composition of Distillates from Coal Extracts Derived by Solution in Processing Byproducts","authors":"V. A. Safin,&nbsp;P. N. Kuznetsov,&nbsp;B. Avid,&nbsp;L. I. Kuznetsova,&nbsp;T. Yu. Ivanenko,&nbsp;A. A. Vorobeva","doi":"10.3103/S1068364X25600745","DOIUrl":"10.3103/S1068364X25600745","url":null,"abstract":"<p>The composition of distillates from coal extracts obtained by thermal solution in high-boiling hydrocarbon fractions—specifically, the processing products of oil and coal—is studied by means of FTIR spectroscopy and <sup>1</sup>H NMR spectroscopy. The results obtained by these two methods are very similar. The distillates consist mainly of aromatic hydrocarbons with admixtures of oxygen- and nitrogen-bearing compounds. The distillate yield increases if heavy catalytic cracking gas oil is added to the solvent. The hydrocarbons present are characterized by a small content of aromatic carbon and hydrogen and a large content of substituents bound to aromatic rings. It is established that these distillates may be used to produce needle coke, since their composition resembles that of the traditional raw materials in this process.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 6","pages":"541 - 548"},"PeriodicalIF":0.5,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090517","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
Production of Bitumens and Humic Matter from Lignite in China: A Theoretical and Practical Review 中国褐煤生产沥青和腐殖质的理论与实践综述
IF 0.5
Coke and Chemistry Pub Date : 2025-09-21 DOI: 10.3103/S1068364X25600721
K. S. Votolin, S. I. Zherebtsov, K. M. Shpakodraev, Yongping Li, Zhichun Wang, A. N. Eremenko
{"title":"Production of Bitumens and Humic Matter from Lignite in China: A Theoretical and Practical Review","authors":"K. S. Votolin,&nbsp;S. I. Zherebtsov,&nbsp;K. M. Shpakodraev,&nbsp;Yongping Li,&nbsp;Zhichun Wang,&nbsp;A. N. Eremenko","doi":"10.3103/S1068364X25600721","DOIUrl":"10.3103/S1068364X25600721","url":null,"abstract":"<p>This review of the literature on research into bitumens (waxes and resins) and humic matter in China shows that China has sufficient reserves of lignite suitable for the production of bitumens and humic matter. Most research is devoted to the composition and properties of the waxy component of bitumens (bitumen wax) and the most representative fractions of humic matter (humic and fulvic acids). The resinous component of bitumens (bitumen resin) and the derivatives of humic acids (humous and hymatomelanic acids) have not been studied enough to permit their effective and safe practical application. Data on the composition and properties of Chinese lignite indicate promising applications in cosmetology, medicine, the food industry, and the chemical industry. Convincing evidence shows that humic and fulvic acids are very effective as plant growth stimulators and as reagents for soil reclamation and water treatment, with applications also in animal husbandry. Promising and widely used technologies are noted. Enterprises in the Chinese market are characterized, along with their notable bitumen and humic products. The review indicates that two-step extraction of bitumens and humic matter, with subsequent separation into narrower fractions, makes more complete use of the chemical potential of lignite and is more economical.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 6","pages":"522 - 534"},"PeriodicalIF":0.5,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145090596","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
Strategic Management of Processing Efficiency at Coal Enrichment Facilities 煤炭浓缩设施加工效率的战略管理
IF 0.5
Coke and Chemistry Pub Date : 2025-08-25 DOI: 10.3103/S1068364X25600678
O. V. Grinkevich, Yu. A. Lepekhina, A. S. Legkobyt, K. D. Astanakulov
{"title":"Strategic Management of Processing Efficiency at Coal Enrichment Facilities","authors":"O. V. Grinkevich,&nbsp;Yu. A. Lepekhina,&nbsp;A. S. Legkobyt,&nbsp;K. D. Astanakulov","doi":"10.3103/S1068364X25600678","DOIUrl":"10.3103/S1068364X25600678","url":null,"abstract":"<div><p>The influence of flotational enrichment on the economic performance of Abashevskaya enrichment facility between 2013 and 2024 is investigated. Operational data for the enterprise are analyzed: for example, the throughput of coal of different ranks; efficiency of equipment use; the rock content of the concentrate; and the variation in concentrate yield. The results show that the introduction of flotational enrichment in 2019 greatly improved the plant’s economic performance. In particular, the coal throughput, the efficiency of equipment use, and the concentrate yield increased, while the rock content of the concentrate fell. Note that large coal fractions were mainly processed before the introduction of flotation, whereas slurry processing was possible afterward. That expanded the range of inputs that may be processed. The analysis indicates successful adaptation of the enterprise to the new technology and optimization of the flotation process for specific conditions. Further innovations to improve the enrichment efficiency should be developed.</p></div>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 5","pages":"439 - 445"},"PeriodicalIF":0.5,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144893944","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
Composites of Coke with Petroleum Additives: Assessment of Clinkering Properties by a Modified Roga Method 焦炭与石油添加剂的复合材料：用改进的Roga法评价熟化性能
IF 0.5
Coke and Chemistry Pub Date : 2025-08-25 DOI: 10.3103/S1068364X25600642
B. S. Zhirnov, A. V. Suslikov, A. E. Eremenko, E. S. Demidenko, V. P. Demidenko, A. E. Raznoushkin
{"title":"Composites of Coke with Petroleum Additives: Assessment of Clinkering Properties by a Modified Roga Method","authors":"B. S. Zhirnov,&nbsp;A. V. Suslikov,&nbsp;A. E. Eremenko,&nbsp;E. S. Demidenko,&nbsp;V. P. Demidenko,&nbsp;A. E. Raznoushkin","doi":"10.3103/S1068364X25600642","DOIUrl":"10.3103/S1068364X25600642","url":null,"abstract":"<div><p>Briquetting is regarded as one of the best methods of processing coke fines. The basic physicochemical properties of the following materials are determined: coke, petroleum coke, and sintering additives in the form of pitch derived from various hydrocarbons (tar sludge, heavy gas oil from catalytic cracking, and heavy pyrolytic tar). The clinkering properties of composites are determined by a modified Roga method as a function of the binder content. Pitch from tar sludge is selected as the best sintering additive in the production of coke fines and petroleum coke fines. Composites with high strength are obtained over a wide range of concentrations of the sintering additives employed. For example, for grade B petroleum coke, the content of pitch from sludge in the composites is 5.0–52.5 wt %; for regular coke, it is 15.0–55.0 wt %.</p></div>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 5","pages":"421 - 425"},"PeriodicalIF":0.5,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144893999","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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