Abstract
This chapter discusses a study to investigate the effects of Ca ion on the thermal behavior of brown coal. The Yallourn coal used in the slow heating experiments was a low ash brown coal from the Latrobe Valley, Australia, with elemental composition 67.4% C, 4.6% H, 0.6% N, 0.3% S, and 27.1% O on a dry ash-free basis. Coal particles of size 75–106 μm were paralyzed in nitrogen under slow heating conditions in a thermogravimetric analyzer. Char samples were mounted in epoxy resin, polished, and examined under oil immersion using an incident light microscope. The raw char samples are richer in plastic particles than the Ca char samples and in the raw and Ca chars, the percentage of the plastic particles increases as pyrolysis temperature becomes higher. If the heating rate and holding time are the same, the reflectance increases as the pyrolysis temperature increases. The reflectance of the chars increases as the holding time becomes longer.
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