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6680100 
Journal Article 
Technology for the Preparation of Ash-free Coal from Low Rank Coal(LRC) 
Kim, S; 이시현 
2008 
46 
3 
443-450 
KJD:ART001241081 
Efficient use of low rank coals (LRC) have ben investigated as a method to cope with recent high oilprice. Among the coals used in industry, lignite and sub-bituminous coals are belong to the LRC, and have abundantdeposit and are distributed worldwide, but high moisture contents and self ignition properties inhibits their utilization. Ining to produce ash-free coal from LRC has been investigated. Two technologies, that is,UCC(Ultra Clean Coal) process removing ash from coal and Hyper Coal process extracting combustibles from coalwere compared with. UCC process has merits of simple and reliable when it compared with Hyper Coal process, but theremaining ash contents werehigher than Hyper Coal. Hyper Coal has ash contents under the 200ppm when raw coal istreated with appropriate solvent and ion exchange materials to remove alkali materials in extracted solution. The ash-freecoal which is similar grade with oil can be used as alternate oil in the industry, and also used as a high grade fuel forIGCC, IGFC and other advanced combustion technology.