Physicochemical properties and heavy metals leachability of fly ash from coal-fired power plant

Xiang Wei; Han Baoping; Zhou Dong; Nzihou Ange

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Physicochemical properties and heavy metals leachability of fly ash from coal-fired power plant

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The physicochemical properties of fly ash from two kinds of coal-fired power plants were studied.Three aspects were examined:the micro-morphology,the mineral composition and the content of heavy met als.The results show that the fly ash from plants using a circulating fluidized bed are more irregular particles,while the particles from the plants using a pulverized coal-fired boiler are mainly spherical in shape.Quartz and mullite are the main crystalline phases in the ash.Clearly,both the technology and the coal used by a power plant can influence the mineral composition of the ash.The mineral composition of fly ash from a circulating fluidized bed is more complex than that from a pulverized coal-fired boiler.The quantity of elements found in the fly ash is greater than that found in the bottom ash for the same plant.Heavy metals are likely to be enriched in the fly ash.Heavy metal leachability was studied using two leaching methods.The results indicate that most of the heavy metals that leached during either batch leaching or column leaching experiments did not exceed the related maximum concentration standards.But Ni concentrations in the leachates from both batch and column tests exceed the standard.The highest excess rates in both tests were 572％ and 497％,which levels might threaten the environment.

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《矿业科学技术（英文版）》 |2012年第3期|405-409|共5页
作者
Xiang Wei; Han Baoping; Zhou Dong; Nzihou Ange;
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School of Environment Science and Spatial Informatics, China University of Mining (ε) Technology, Xuzhou 221116, China;

Centre RAPSODEE, Mines Albi,University of Toulouse, Albi 81013, France;

School of Environment Science and Spatial Informatics, China University of Mining (ε) Technology, Xuzhou 221116, China;

Xuzhou Institute of Technology, Xuzhou 221008, China;

Beijing Puresino-Boda Environmental Engineering Co., Ltd., Beijing 100082, China;

Centre RAPSODEE, Mines Albi,University of Toulouse, Albi 81013, France;

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Physicochemical properties and heavy metals leachability of fly ash from coal-fired power plant

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