Study on the Liberation of Organic Macerals in Coal by Liquid Nitrogen Quenching Pretreatment
In order to study the liberation characteristics of different macerals in coal, one must improve the liberation degree of macerals in coal and promote the utilization of macerals based on their properties. Based on the idea of quick cooling to change the brittleness and toughness of different macera...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-10-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/10/10/911 |
| _version_ | 1797550869409955840 |
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| author | Jinwen Fan Meili Du Lei Liu |
| author_facet | Jinwen Fan Meili Du Lei Liu |
| author_sort | Jinwen Fan |
| collection | DOAJ |
| description | In order to study the liberation characteristics of different macerals in coal, one must improve the liberation degree of macerals in coal and promote the utilization of macerals based on their properties. Based on the idea of quick cooling to change the brittleness and toughness of different macerals, the characteristics of macerals in coal are studied here by liquid nitrogen quenching pretreatment. In particular, coarse-grained samples (with a particle size of 1–3 mm) were. For this study, coal samples were sourced from the Yan’an Formation (J<sub>2</sub>y), a middle Jurassic coal formation in the Huangling no. 1 coal mine, located in northern Shaanxi Province, China. Firstly, we analyzed the coal properties and coal petrographic characteristics by the Chinese national standard method. Secondly, the distribution characteristics of macerals in different particle sizes (>0.9, 0.5–0.9, 0.1–0.5, and <0.1) were studied. Then, the samples with different particle sizes were quenched with or without liquid nitrogen to obtain the experimental group and blank group products. Finally, the differences in the liberation characteristics between the experimental group and the blank group products were studied via analyzing the micromorphology, specific surface area, pore volume, pore size and liberation degree. Our results for the particles size and liberation degree analysis indicate that inertinite and vitrinite were enriched in the coarse particles (>0.5 mm) and fine particles (<0.1 mm) here, respectively. Moreover, quenching pretreatment could contribute to the liberation of different macerals from coal, mainly because of the different effects of stress on the different components when they suddenly encounter cold, and this kind of liberation is mainly arc-shaped liberation between different macerals. In addition, along with the above results, this paper presents an optimized model for the liberation of macerals based on a combination of screening, liquid nitrogen quenching pretreatment and re-crushing. |
| first_indexed | 2024-03-10T15:36:32Z |
| format | Article |
| id | doaj.art-7ee966ec9d1449d9ab4787a0d3cbe264 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-10T15:36:32Z |
| publishDate | 2020-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-7ee966ec9d1449d9ab4787a0d3cbe2642023-11-20T17:12:20ZengMDPI AGMinerals2075-163X2020-10-01101091110.3390/min10100911Study on the Liberation of Organic Macerals in Coal by Liquid Nitrogen Quenching PretreatmentJinwen Fan0Meili Du1Lei Liu2College of Chemistry and Chemical Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaCollege of Chemistry and Chemical Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaCollege of Chemistry and Chemical Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaIn order to study the liberation characteristics of different macerals in coal, one must improve the liberation degree of macerals in coal and promote the utilization of macerals based on their properties. Based on the idea of quick cooling to change the brittleness and toughness of different macerals, the characteristics of macerals in coal are studied here by liquid nitrogen quenching pretreatment. In particular, coarse-grained samples (with a particle size of 1–3 mm) were. For this study, coal samples were sourced from the Yan’an Formation (J<sub>2</sub>y), a middle Jurassic coal formation in the Huangling no. 1 coal mine, located in northern Shaanxi Province, China. Firstly, we analyzed the coal properties and coal petrographic characteristics by the Chinese national standard method. Secondly, the distribution characteristics of macerals in different particle sizes (>0.9, 0.5–0.9, 0.1–0.5, and <0.1) were studied. Then, the samples with different particle sizes were quenched with or without liquid nitrogen to obtain the experimental group and blank group products. Finally, the differences in the liberation characteristics between the experimental group and the blank group products were studied via analyzing the micromorphology, specific surface area, pore volume, pore size and liberation degree. Our results for the particles size and liberation degree analysis indicate that inertinite and vitrinite were enriched in the coarse particles (>0.5 mm) and fine particles (<0.1 mm) here, respectively. Moreover, quenching pretreatment could contribute to the liberation of different macerals from coal, mainly because of the different effects of stress on the different components when they suddenly encounter cold, and this kind of liberation is mainly arc-shaped liberation between different macerals. In addition, along with the above results, this paper presents an optimized model for the liberation of macerals based on a combination of screening, liquid nitrogen quenching pretreatment and re-crushing.https://www.mdpi.com/2075-163X/10/10/911coalmaceralsliberationliquid nitrogen quenchingpretreatment |
| spellingShingle | Jinwen Fan Meili Du Lei Liu Study on the Liberation of Organic Macerals in Coal by Liquid Nitrogen Quenching Pretreatment Minerals coal macerals liberation liquid nitrogen quenching pretreatment |
| title | Study on the Liberation of Organic Macerals in Coal by Liquid Nitrogen Quenching Pretreatment |
| title_full | Study on the Liberation of Organic Macerals in Coal by Liquid Nitrogen Quenching Pretreatment |
| title_fullStr | Study on the Liberation of Organic Macerals in Coal by Liquid Nitrogen Quenching Pretreatment |
| title_full_unstemmed | Study on the Liberation of Organic Macerals in Coal by Liquid Nitrogen Quenching Pretreatment |
| title_short | Study on the Liberation of Organic Macerals in Coal by Liquid Nitrogen Quenching Pretreatment |
| title_sort | study on the liberation of organic macerals in coal by liquid nitrogen quenching pretreatment |
| topic | coal macerals liberation liquid nitrogen quenching pretreatment |
| url | https://www.mdpi.com/2075-163X/10/10/911 |
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