Study on the leaching experiment of hazardous minor and trace elements in coals and its ash from coal-fired power plant
- China Univ. of Mining and Technology, Beijing (China). Beijing Graduate School
- Geology Inst. of Nuclear Industry Dept. (China)
Coal (C), fly ash (FA) and bottom ash (BA) from the thermoelectric plant of Shengtou, Shanxi Province along with the coal`s high temperature ash (HTA) produced in the laboratory were leached under different conditions and leaching times. The leaching behaviors of As, Cr, Cd, Pb, Ni, Co, Cu, Zn, Hg, Ba, Mn, Cl, hazardous minor and trace elements, were investigated in detail. The pH values of the leaching solutions were 2.0, 4.0, 6.0 and 7.5. The total leaching time was 80 hours. The sampling time intervals were 5 hours from the beginning up to 30 hours and then 10 hour intervals from 30 to 80 hours. The results showed the pH values of leaching solutions, leaching times, element species and their occurrences in C, HTA, FA, BA have a significant impact on the leaching behavior. Among these elements, Cl, Hg, Ba, As, and Cd in C, HTA, FA, BA, Cr in HTA, FA, are more strongly leached. Under the leaching conditions the concentrations of Co, Cu, Ni and Pb in C, HTA, FA, BA remained unchanged. The leaching susceptibility of all elements is stronger in acid solution than in base solution and the more acid the leaching solution, the stronger is the susceptibility.
- OSTI ID:
- 324807
- Report Number(s):
- CONF-970931-; TRN: IM9911%%504
- Resource Relation:
- Conference: 14. annual international Pittsburgh coal conference and workshop: clean coal technology and coal utilization, Taiyuan (China), 23-27 Sep 1997; Other Information: PBD: 1997; Related Information: Is Part Of Fourteenth annual international Pittsburgh coal conference and workshop: Proceedings; PB: [1500] p.
- Country of Publication:
- United States
- Language:
- English
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