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An Evaluation on the Physical and Chemical composition of coal combustion Ash and Its co-placement with coal-Mine Waste Rock

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Journal of Environmental Protection 2012年第7期3卷 589-596页

作者： Ginting J. Kusuma Hideki Shimada Takashi Sasaoka Kikuo Matsui Candra Nugraha Rudy S. Gautama Budi Sulistianto Department of Earth Resources Engineering Faculty of Engineering Kyushu University Fukuoka Japan Environment Department PT. Kaltim Prima Coal Sengata Indonesia Mining Engineering Research Group Institute Technology Bandung Bandung Indonesia

In the last few decades, the utilization of coal to generate electricity was rapidly increasing. consequently, the production of coal combustion ash (CCA) as a by-product of coal utilization as primary energy sources was increased. The physical and geochemical characteristics of CCA were site-specific which determined by both inherent coal-source quality and combustion condition. This study was intended to characterize the physical, chemical and mineralogical properties of a coal-combustion ash (CCA) from a site specific power plant and evaluate the leachate characteristic of some scenario on the co-placement of CCA with coal-mine waste rock. The physical properties such as specific gravity, dry density, porosity and particle size distribution were determined. Chemically, the CCA sample is enriched mainly in silica, aluminum, iron, and magnesium along with a little amount of calcium and sodium which includes in the class C fly ash category. Moreover, it is found that the mineral phases identified in the sample were quartz, mullite, aragonite, magnetite, hematite, and spinel. co-placement experiment with mudstone waste rock shows that the CCA, though it has limited contribution to the decreasing permeability, has important contributed to increase the quality of leachate through releasing higher alkalinity. Moreover, addition of CCA did not affect to the increase of the trace metal element in the leachate. Hence, utilization of CCA by co-placement with coal mine waste rock in the dumping area is visible to be implemented.

关键词： coal combustion Ash Characteristic co-placement Sulfidic Waste Rock

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