Using HyperCoal to prepare metallurgical coal briquettes via hot-pressing

HyperCoal was prepared from low-rank coal via high-temperature solvent extraction with N-methylpyrrolidone as an extraction solvent and a liquid-to-solid ratio of 50 mL/g in a high-temperature and high-pressure reactor. When HyperCoal was used as a binder and pulverized coal was used as the raw mate...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2019-05, Vol.26 (5), p.547-554
Main Authors: Wang, Ya-jie, Zuo, Hai-bin, Zhao, Jun, Zhang, Wan-long
Format: Article
Language:English
Subjects:
Briquets
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Coal
Composites
Compressive strength
Corrosion and Coatings
Extractive metallurgy
Glass
High temperature
Materials Science
Metallic Materials
Moisture resistance
Natural Materials
Pressing
Pulverized coal
Raw materials
Solvent extraction
Solvents
Surfaces and Interfaces
Temperature
Thermal resistance
Thermal stability
Thin Films
Tribology
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Summary:HyperCoal was prepared from low-rank coal via high-temperature solvent extraction with N-methylpyrrolidone as an extraction solvent and a liquid-to-solid ratio of 50 mL/g in a high-temperature and high-pressure reactor. When HyperCoal was used as a binder and pulverized coal was used as the raw material, the compressive strength of the hot-pressed briquettes (each with a diameter of 20 mm and mass of 5 g) under different conditions was studied using a hot-pressing mold and a high-temperature furnace. The compressive strength of the hot-pressed briquettes was substantially improved and reached 436 N when the holding time period was 15 min, the hot-pressing temperature was 673 K, and the HyperCoal content, was 15wt%. Changes in the carbonaceous structure, as reflected by the intensity ratio between the Raman G- and D-bands (I G /I D ), strongly affected the compressive strength of hot-pressed briquettes prepared at different hot-pressing temperatures. Compared with cold-pressed briquettes, hot-pressed briquettes have many advantages, including high compressive strength, low ash content, high moisture resistance, and good thermal stability; thus, we expect that hot-pressed briquettes will have broad application prospects.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-019-1763-3