内外液化用原料炭の基礎性状 （ＩＩ） 鉱物質組成

Abstract

Reaction characteristics for liquefaction of Japanese and foreign coals are being studied as part of the program of coal liquefaction at the Government Industrial Development Laboratory, Hokkaido. In this study, samples of mineral matter from various coals prepared by a low-temperature ashing technique (LTA) and by a high-temperature ashing technique (HTA) were examined by inductively-coupled plasma emission spectroscopy (ICP), X-ray fluorescence (XRF) and X-ray diffraction in order to obtain fundamental information to clarify the effects of inherent mineral matter on coal liquefaction.The contents of ashes prepared by a low-temperature ashing technique (LTA) and by a high-temperature ashing technique (HTA) range from ca.2wt% to ca.27wt%. The LTA content is higher than the HTA content in most cases due to dehydration and dehydroxylation of clay minerals, decomposition of carbonate minerals, and dehydration of sulfate minerals by high-temperature treatment.According to the results of ICP analysis, the main components of mineral matter in coal are Si, Ti, Al, Ca, Na, K, Fe and Mg, and the minor components (0.01-0.20wt%) are Mn, Zn, V, Cr, Ni, Cu, and Be. Australian Yallourn lignite is rich in Fe and Mg, and poor in Si and Al. Canadian sub-bituminous coals (Egg Lake and Wabamum) and Chinese Shori lignite and sub-bituminous coals (Koken and Karinga) are rich in Ca. American Kaiser #3 bituminous coal is rich in Fe, Mn, Cu and Be, and Colombian Titiribi bituminous coal is rich in Ca, Fe and Cu. Australian sub-bituminous coals (Wandoan and Liddell) and Japanese sub-bituminous coal (Taiheiyo) and bituminous coal (Shin-Yubari) have a comparatively similar elemental composition.According to the results of X-ray diffraction, the LTA contains quartz, kaolinite, illite, calcite, dolomite, pyrite etc. The HTA contains less identifiable components, namely, quartz, metakaolin, anhydrite, bassanite, hexahydrite etc.