To use low grade carbonaceous resources, such as brown coal and biomass, efficiently, dewatering, increasing heating value, and suppressing self-ignition tendency are required. We have found that the low-molecular-weight compounds obtained by treating low rank coal in non-polar solvent at around 350℃ had the low self-ignition tendency because of their small pore surface area. However, the self-ignition tendency of the entire solvent treated coal(STC)was still slightly higher than that of raw coal. In this study, hot-press briquetting method was employed to reduce pore surface area of low rank coal and STC. It was found that the samples prepared by hot-press briquetting from raw coal had small pore surface area than the raw coal and the coal pyrolyzed under normal pressure, and the self-ignition tendency decreased with the increase of treatment pressure. The samples prepared by hot-press briquetting from the STC at around 250℃ also had small pore surface area and low self-ignition tendency than the STC.
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