Classification of Micro-Particles in Fly Ash

Fly ash samples collected from five power plants, different in either the rank of the fed coals or the type of the boilers, were analyzed with optical microscopy and scanning electron microscopy. Based on the difference in chemical composition and microstructure, a classification scheme for micro‐pa...

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Published in:Developments in Chemical Engineering and Mineral Processing 2001, Vol.9 (3-4), p.233-238
Main Authors: Sun, Jun-Min, Yao, Qiang, Xu, Xu-Chang
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Language:English
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description Fly ash samples collected from five power plants, different in either the rank of the fed coals or the type of the boilers, were analyzed with optical microscopy and scanning electron microscopy. Based on the difference in chemical composition and microstructure, a classification scheme for micro‐particles in fly ash is proposed. First, according to chemical composition, the micro‐particles in fly ash are divided into four groups, namely aluminosilicate, ferruginous, calcareous, and unburnt carbon. Second, these groups are sub‐divided into 16 categories by the difference in morphology and internal microstructure. For example, the aluminosilicate group is sub‐divided into cenospheres, plerospheres, porous spheres, solid spheres, irregular porous particles and dense particles. The microscopic properties of each category are discussed from the environmental and utilization standpoint.
doi_str_mv 10.1002/apj.5500090304
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