主催: 社団法人 日本エネルギー学会
会議名: 第31回石炭科学会議
回次: 31
開催地: 札幌
開催日: 1994/08/31 - 1994/09/01
p. 208-211
Pretreatment of lignite including drying of low rank coal is one of the most important processes for its utilization. Volume shrinkage and recovery of lignite have been measured with a swelling apparatus at 30℃. Dewatering with conc. H_2SO_4 is a reversible process, while conventional drying process is not with respect to volume changes. Volume changes during dewatering and drying process of lignite are responsible to the molecular association and inter- and intra- molecular bonding. Spin-spin relaxation times of proton in lignite molecules and associated water molecules are also providing the characterization during the dewatering and drying process.