Reactivity of mechanical activated coals for special utilization
| Autor: | P. Imrich, J. Vidlář, F. Foldyna, Peter Baláž, T. Liptaj, L'. Turčániová, J. Kádárová, J. Sitek, J. Vašek |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
chemistry.chemical_classification
Aqueous solution Chemistry business.industry Mechanical Engineering Chemical structure technology industry and agriculture Mineralogy complex mixtures Grinding 13c nmr spectroscopy Chemical engineering Mechanics of Materials medicine Humic acid General Materials Science Coal Leaching (metallurgy) business Activated carbon medicine.drug |
| Zdroj: | Journal of Materials Science. 39:5467-5470 |
| ISSN: | 0022-2461 |
| DOI: | 10.1023/b:jmsc.0000039267.31881.2e |
| Popis: | The paper presents the coal activation effect as disintegration in the nano-submicron range and destruction carbon structure. The Slovak brown coal activated in planetary mill is characterised by destruction of organic structure of coal. The biggest activation effect connected with the destruction of C—C bonds of sp3 carbons has been confirmed by 13C NMR spectroscopy in the chemical structure of humic acids extracted from the coal sample activated for a period of 60 min. The specific surface of humic acids is much smaller then that of mechanically activated sample from which they were extracted. The black Czech coal was activated by two stage disintegration. In the first stage of mechanochemical activation using Grinding Aqueous Caustic Leaching, GACL method a fine dispersed semiproduct is formed with the size of particles from 2.5 to 9000 nm. The additional disintegration using water jet increases the effect of disintegration in the submicron area of the coal product. The volume distribution maximum achieves in this stage about 60 wt% of 750 nm grains. |
| Databáze: | OpenAIRE |
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