Abstract
ABSTRACTFive typical lignites from Inner Mongolia were upgraded by microwave irradiation to improve their slurryabilities. This procedure was performed to utilize abundant cheap lignites recently exploited in China to produce quality coal water slurry (CWS) fuel for gasification and combustion. The physicochemical properties of upgraded lignites were investigated through Fourier transform infrared spectroscopy, zeta potential analysis, contact angle analysis, and N2 adsorption porosimetry. The oxygen functional groups and oxygen/carbon ratios decreased in five upgraded lignites after microwave irradiation, but their zeta potentials and contact angles increased. The specific surface areas of five upgraded lignites decreased because of collapse and shrinkage of pores. These changes in five upgraded lignites resulted in increased coal rank and decreased hydrophilicity, which were beneficial to prepare CWS with high solid concentrations. The maximum solid concentrations of CWS prepared from five upgraded lignites increased by 4.0–9.8%.
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