Hyper-Coal (HPC) is produced by extracting a coal in 2-ring aromatic solvent andseparating insoluble component (residue-Coal: RC) from soluble component by gravitysettling separation. It is important for HPC process to select the coal that has high solubility insolvent and its RC has first settling velocity.In this study, we focused on different particle size group in coal because we think it hasdifferent solubility in solvent and settling velocity of its RC. First, we separated a coal severalparticle size groups by screen. Next we examined about solubility of each particle size coal. Itwas shown that the each group of particle size has different behavior to dissolve in solvent. Itwas thought the difference property for pulverization about the component that was easy todissolve in solvent. Finally we measured the settling velocity of RC from each group ofparticle size. The RC from different particle size coal group also showed different behavior tosettling velocity. It seemed that settling velocity depended on RC aggregation in actualcondition. So, it suggests that knowing RC aggregation mechanism is important forsolid-liquid separation.
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