Attrition characteristics and mechanisms for limestone particles in an air-jet apparatus
Attrition is very important for limestone particles used to capture SO2 and CO2. In this study, the attrition of limestone particles was investigated at room temperature using an air-jet apparatus, based on the standard ASTM D 5757-00 method. The mass percent of fines increased almost linearly with...
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Veröffentlicht in: | Powder technology 2011-02, Vol.207 (1-3), p.183-191 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Attrition is very important for limestone particles used to capture SO2 and CO2. In this study, the attrition of limestone particles was investigated at room temperature using an air-jet apparatus, based on the standard ASTM D 5757-00 method. The mass percent of fines increased almost linearly with time for 125–850μm particles. In the attrition process, abrasion was initially the main mode of attrition for 710–850μm particles, causing the particles to become rounded and smooth. Fragmentation became important as well when the particles reached the 200–400μm range and became the main mode of attrition for particles smaller than 180μm. The change in the mode of attrition is important, as attrition models tend to assume that the mode is always the same.
Particles of initial size 710–850μm became smooth over the first 48h with a limited decrease in particle size in a sonic air-jet apparatus, became more rounded with size decreasing significantly during the next 48h, and partially broke after the third 48h period of attrition, with some being round and others angular. [Display omitted]
► Abrasion was initially the main mode of attrition for 710–850μm particles. ► Fragmentation became important as well as abrasion for 200–400μm particles. ► Fragmentation was the main mode for |
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ISSN: | 0032-5910 1873-328X |
DOI: | 10.1016/j.powtec.2010.10.028 |