26.溶剤抽出脱灰炭(ハイパーコール)に残存する無機物の特性

概要

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Hyper-coal is a solvent de-aching coal. Coal is exratcted with 2-ring aromatics, and insoluble is removed from the solution by settling and filtration. Usually, several hundred PPM of ash is remained in Hyper-coal, even though the solution is passed the 0.5μm of filter. This paper focuses about the characteristics of the remaining ash in Hyper-coal. The metallic element component in Hyper-coal is largely different from the raw coal; Fe, Si and Ti occupy the majority in the remained ash. The existence of organic metals such as siloxanes are confirmed, but the quantity is negligible. A TEM image indicates that the Hyper-coal ash is formed by nano-meter particles. When the solvent is removed by distillation, rich domains of Si, Al, Ca and O are appeared on the surface of Hype-coal in the SEM-EDX images. It is considered that the almost remaining ash may be the ultra fine particles, those are too small to be filtered. The aggregated metallic compounds may be formed by the effect of concentration. On the other hand, such a rich domain is not appeared on Hyper-coal particle when a flasher removes the solvent. It suggests that the organics (Hyper-coal) and metallic compounds (ash) are formed separately by flashing.
一般社団法人日本エネルギー学会の論文
2003-10-23