A Chinese sub-bituminous coal, i.e., Shengfu (SF) coal,
was hydrothermally
treated with and without CaO addition at different temperatures, and
the extraction yields and caking indexes (G
RI) of the treated coals were measured. The action of CaO during hydrothermal
treatment was probed in this study. The results show that hydrothermal
treatment can obviously increase the extraction yield and G
RI of SF coal, and CaO can further promote this
effect of hydrothermal treatment. The removal of oxygen functional
groups, especially the hydroxyl group, dissociating the aggregated
structure of coal, is responsible for the modifying results. CaO can
supply a basic environment for the hydrothermal treatment, which is
beneficial for the removal of acidic oxygen functional groups by acid–base
interactions and promotes the effect of hydrothermal treatment for
SF coal, resulting in additional increases in the extraction yield
and G
RI.
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