17. Mineral Evolution during Coal Extraction

概要

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Two Argonne premium coals, bituminous Illinois No.6 (IL) and sub-bituminous Wyodak (WY), were extracted by 1-methynaphthalene (1-MN) to produce the clean fuel, namely HyperCoal (HPC). The mineral evolution upon coal extraction and the occurrence of inorganic constituents in HPC were investigated. At 360℃, the majority of inherent coal ash (>99wt%) remains in the by-product (insoluble part). The HPC contains 0.13wt% and 0.16wt% ash in the case of IL and WY coal, respectively. Fe is the most prevalent, accounting for 436.2ppm and 631.4ppm in the HPC of IL and WY, respectively. Its presence in the HPC of IL was likely contributed from two routes, i.e., release of Fe-containing submicron mineral particles in ferritin in coal matrix and fragmentation of coarse compounds like pyrite (FeS_2). On the other hand, in the case of WY HPC, in addition to the above-listed two sources, around 18% of total Fe was contributed from its ion-exchangeable constituents.
一般社団法人日本エネルギー学会の論文
2006-10-12