3RUBICRA F, ARENILLAS A, PEVIDA C, et al. Coal structure and reactivity changes induced by chemical demineralization[J]. Fuel Processing Tech- nology, 2002, 79(3) :273-279.
4WATANABE W, ZHANG D K. The effect of inher- ent and added inorganic matter on low-temperature oxidation reaction of coal[J]. Fuel Processing Tech- nology, 2001,74:145-160.
5STEEL K M, PATRICK T W. The production of ultra clean coal by sequential leaching with HF fol- lowed byHNOa[J]. Fuel, 2003,82: 1917-1920.
6SHIMIZU K, KARAMATSU H, LWAMI Y, et al. Solubilization of lignite with superacid(trifluoro- methanesulfonic acid)/isopentane at the mild condi- tions[J].Fuel Process Technology, 1995, 45: 85- 94.
7NISHIOKA M, GEBHARD L A, SELBERNAGEL B G. Evidence for change-transfer complexs in high- volatile bituminous coal[J].Fuel, 1991, 70: 341- 348.
8SAKANISHI K, SAITO I, ISHOM F, et al. Char- acterization and elution behaviors of organically as- sociated minerals in coals during acid treatment and solvent extraction [J]. Fuel, 2002, 81 (11/12): 1471-1475.
