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Construction of Dry Cover System for Prevention of Acid Mine Drainage at Mine Waste Dump in Open Cast Coal Mines, Indonesia

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j.urnal of Environmental Protection 2016年第2期7卷 160-169页

作者： Shinj. Matsumoto Hideki Shimada Takashi Sasaoka ginting j. kusuma Rudy S. Gautama Department of Earth Resources Engineering Kyushu University Fukuoka Japan Department of Mining Engineering Institute Technology Bandung Bandung Indonesia

Acid Mine Drainage (AMD) which occurs when sulfide minerals are exposed to water and oxygen with an excavation is one of the serious environmental problems in the world. A dry cover system is generally constructed in waste dump for the prevention of AMD in Indonesia by virtue of low cost and availability of waste rocks for a cover layer. However, the failure of the system caused by the lack of information related to the construction of cover system in mines, which leads to AMD, has been reported recently in Indonesia. In this study, the field investigation was conducted in pit and waste dump in open cast coal mine in Indonesia with the aim of obtaining the information on the construction of a cover layer and backfilling conditions of waste rocks in the waste dump. The rock samples taken in two areas of the mine were analyzed by geochemical analysis and sequential extraction with acids. The results indicated that Net Acid Producing Potential (NAPP) of the rocks in the waste dump down to 100 cm depth in both areas was from 10 to 30 kg H2SO4/ton, suggesting that Potentially Acid Forming (PAF) was backfilled in a cover layer. The backfill of PAF was contrary to the concept of cover system, which caused the failure of constructing a cover layer. The cause of the failure was likely attributed to the shortage of cover rocks which are classified as Non Acid Forming (NAF) or the failure of proper placement of them by an operational problem in the areas. Moreover, the results of the extraction with acids suggested that the form of iron and sulfur has to be taken into account to discuss the occurrence of AMD.

关键词： Acid Mine Drainage (AMD) Dry Cover System Open Cast Coal Mine Indonesia

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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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j.urnal 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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Application of Fly Ash and Organic Material as Dry Cover System in Prevention of Acid Mine Drainage Generation

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j.urnal of Geoscience and Environment Protection 2020年第5期8卷 56-64页

作者： Thant Swe Win Sendy Dwiki Akihiro Hamanaka Takashi Sasaoka Hideki Shimada Shinj. Mastumoto ginting j.lu kusuma Department of Earth Resources Engineering Kyushu University Fukuoka Japan Mining Engineering Department Institut Teknologi Bandung Bandung Indonesia Geological Survey of j.pan National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Japan

The common practice in AMD prevention is a dry cover technique. In this technique, rock that is potential in producing acidity (PAF) will be placed below non-acid producing rock (NAF). Depends on NAF availability in the mine site situation, organic covers can be used to prevent diffusion of oxygen into reactive sulphide wastes and subsequently to eliminate sulphide compounds oxidation and generation of acidic waters. The utilization of additional material cover layer is proposed, by using fly ash and organic material combination. To investigate the possibility of using these materials, a column leaching test in the laboratory scale was conducted with several scenarios of simulation. By comparing between column with different thickness of fly ash and organic material, the leachate water behavior is observed in the experiment, including the measurement of water quality (pH and EC), maj.r cations-anions. The result suggests the possible thickness of fly ash (FA) and organic material (OM) as cover layer material, especially in the case of mine with domination of PAF rock material.

关键词： AMD Fly Ash Organic Material Dry Cover Coal Mine Column Leaching

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