Properties and utilization aspects of fly ash from a anthracite coal-fired power plant in northwestern Henan Province, P. R. China
- China Univ. of Mining Technology, Beijing (China). Beijing Graduate School
- Jiaozuo Inst. of Tech., Henan (China)
Jiaozuo power plant, located in northwestern Henan province, is one of the largest plants in the power network of central China. It is equipped with 6{times}200MW generating sets fed by the anthracite coal from Shanxi province. Up to 0.8 million tons of fly ash, bottom ash, and boiler slag are produced annually and less than 20% of them was used beneficially. Fly ash is separated into floating spheres, magnetic spheres, settling spheres and unburnt carbon; the contents of the fractions are 0.7%, 0.62%, 91.68% and 7%, respectively. Bottom ash and separated fly ash were analyzed with SEM, XRD and wet chemical method. Morphologically, floating spheres are large cenospheres. Settling spheres are spheroids with smooth surfaces, most of them are less than 10 {micro}m in diameter. Magnetic spheres present rough surfaces with intergrowth of hematite and magnetite crystals. Unburnt carbon is predominantly infusible char, reflecting the high coalification degree of the feed coal. Mineralogically, the content and crystal size of mullite in bottom ash are greater than in floating and settling spheres. Chemically, floating spheres contain more Al{sub 2}O{sub 3} and SiO{sub 2} and less Fe{sub 2}O{sub 3}, CaO, MgO, K{sub 2}O in comparison with bottom ash and settling spheres, which indicates that floating spheres are originated from the minerals with high melting point and viscosity. To date, fly ash from this power plant has been used in sticky soil amendment, brick production by mixing with coal waste; highway pavement; railway tunnel construction and thermal insulation material production using floating spheres. Other applications must be developed to recycle the high fly ash output. Small settling spheres, especially those less than 10{micro}m in diameter, have great potential in concrete and functional filling, so the separation and utilization of very small settling spheres should be emphasized. Additionally, bottom ash may be used for synthesis of mullite.
- OSTI ID:
- 349082
- Report Number(s):
- CONF-980985-; ISBN 1-890977-15-2; TRN: IM9924%%82
- Resource Relation:
- Conference: 15. annual international Pittsburgh coal conference, Pittsburgh, PA (United States), 14-18 Sep 1998; Other Information: PBD: 1998; Related Information: Is Part Of Fifteenth annual international Pittsburgh coal conference: Proceedings; PB: [1500] p.
- Country of Publication:
- United States
- Language:
- English
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