K. S. Votolin, S. I. Zherebtsov, K. M. Shpakodraev, A. L. Pykin, D. D. Shaymukhametova
{"title":"Humic Substances from Oxidized and Unoxidized Coal","authors":"K. S. Votolin, S. I. Zherebtsov, K. M. Shpakodraev, A. L. Pykin, D. D. Shaymukhametova","doi":"10.3103/S1068364X24600052","DOIUrl":null,"url":null,"abstract":"<div><p>Oxidized and unoxidized coal samples of various ranks are compared, as well as the humic and fulvic acids derived from those materials. Petrographic analysis shows that macerals of the vitrinite group predominate in the coal samples; the oxidized samples belong to oxidation group OK II. B coal (lignite) and D coal (long-flame coal) undergo more profound changes than G coal (gas coal) on oxidation (weathering). Compared to their unoxidized counterparts, the oxidized coal samples are characterized by higher ash content, yield of volatiles, and content of oxygen, nitrogen, and sulfur. The elemental composition of fulvic and humic acids from oxidized and unoxidized B and D coal varies widely but may be regarded as typical. Compared to fulvic acid, all the samples of humic acid are higher in carbon and lower in oxygen, nitrogen, and sulfur. Given the high yield of fulvic and humic acids from oxidized B and D coal, they may be regarded as promising raw materials for humic production. The yield of fulvic and humic acids from oxidized G coal is minimal.</p></div>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"67 1","pages":"29 - 36"},"PeriodicalIF":0.4000,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Coke and Chemistry","FirstCategoryId":"1085","ListUrlMain":"https://link.springer.com/article/10.3103/S1068364X24600052","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Oxidized and unoxidized coal samples of various ranks are compared, as well as the humic and fulvic acids derived from those materials. Petrographic analysis shows that macerals of the vitrinite group predominate in the coal samples; the oxidized samples belong to oxidation group OK II. B coal (lignite) and D coal (long-flame coal) undergo more profound changes than G coal (gas coal) on oxidation (weathering). Compared to their unoxidized counterparts, the oxidized coal samples are characterized by higher ash content, yield of volatiles, and content of oxygen, nitrogen, and sulfur. The elemental composition of fulvic and humic acids from oxidized and unoxidized B and D coal varies widely but may be regarded as typical. Compared to fulvic acid, all the samples of humic acid are higher in carbon and lower in oxygen, nitrogen, and sulfur. Given the high yield of fulvic and humic acids from oxidized B and D coal, they may be regarded as promising raw materials for humic production. The yield of fulvic and humic acids from oxidized G coal is minimal.
比较了不同等级的氧化和未氧化煤炭样本，以及从这些材料中提取的腐殖酸和富勒酸。岩相分析表明，煤炭样本中主要是矾石类矿物；氧化样本属于氧化组 OK II。在氧化（风化）过程中，B 煤（褐煤）和 D 煤（长焰煤）比 G 煤（气煤）发生了更深刻的变化。与未氧化的煤样相比，氧化煤样的灰分含量、挥发物产量以及氧、氮和硫含量都较高。氧化和未氧化 B 和 D 煤中的富勒酸和腐植酸的元素组成差异很大，但可视为典型的元素组成。与富酸相比，所有腐植酸样本的碳含量都较高，而氧、氮和硫的含量都较低。鉴于氧化 B 煤和 D 煤中富勒酸和腐植酸的产量较高，可将它们视为有前途的腐植酸生产原料。氧化 G 煤的富勒酸和腐植酸产量极低。
期刊介绍：
The journal publishes scientific developments and applications in the field of coal beneficiation and preparation for coking, coking processes, design of coking ovens and equipment, by-product recovery, automation of technological processes, ecology and economics. It also presents indispensable information on the scientific events devoted to thermal rectification, use of smokeless coal as an energy source, and manufacture of different liquid and solid chemical products.
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