Name : [in Japanese]
Location : [in Japanese]
Date : October 27, 2020 - October 28, 2020
Pages 38-39
The thermal behavior of ash components in bituminous coals (Upper Freeport (UF), Illinois #6 (IL) and Beulah-Zap (BZ)) under air and argon atmospheres in the range temperature of 800-1200°C was investigated using XRD and TEM measurements. UF treated under air formed the needle-like crystals which was deduced to be mullite by transformation of andalusite because they mainly consisted of SiO2 and Al2O3. In contrast to UF, IL did not generate these crystals. However, when IL was treated under air after carbonization under Ar, the crystals appeared. The presence of lime in IL inhibited the formation of mullite. Oldhamite was formed by reacting lime with sulfur at the carbonization of IL. As lime was consumed, the formation of mullite was not inhibited under air after Ar treatment.
