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http://dx.doi.org/10.7844/kirr.2014.23.1.40

Application of Unburned Carbon Produced from Seochun Power Plant  

Lee, Sujeong (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources)
Cho, Seho (University of Science & Technology)
Lee, Young-Seak (University of Science & Technology)
An, Eung-Mo (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources)
Cho, Sung-Baek (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Resources Recycling / v.23, no.1, 2014 , pp. 40-47 More about this Journal
Abstract
Feasibility of utilizing unburned carbon residue in coal ash as a potential precursor for the production of activated carbon was assessed to seek for solution to recycle unburned carbon residue. The unburned carbon concentrate generated from the 4 stages of cleaner flotation has a grade of 87% carbon. The crystalline impurities in the concentrate included quartz and mullite. Unburned carbon had a low specific surface area of $10m^2/g$, which might be related to a high degree of coalification of domestic anthracite coal. Carbon particles were mostly porous and have a turbostratic structure. When 1g of carbon was activated with 6g of KOH powder, the highest specific surface area value of $670m^2/g$ was achieved. Low wettability of unburned carbon particles, which was resulted from high temperature combustion in a boiler, might cause poor pore formation when they were activated by KOH solution. The activated carbon produced in this study developed micropores, with an equivalent quality of general-purpose activated carbon made from coal. Hence, it is concluded that chemically treated unburned carbon can be used for water purification or an alternative to carbon black as it is.
Keywords
Pond ash; separation; unburned carbon residue; recycling; application;
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