Abstract
Hyper-coal process adopts the solvent de-ashing technology to produce the ash-free coal (Hyper-coal, HPC)^<1)>. Coal is extracted with the coal-derived solvent, which consists with 2-ring aromatics, at 360-400℃. The Hyper-coal slurry, which consists with the coal solution and insoluble solid (Resid-coal, RC), is introduced into the settler. The clarified solution and the concentrated solid (RC) are obtained by the high-temperature gravity settling. This paper concerns to the RC sedimentation behavior and the clarification behavior using the batch-type settler. The influences of the settling time, solid concentration were examined. We understood that the 1-2 hrs of settling time is needed for converging the solid-liquid separation under the conditions of 310-380℃, 10-25wt% slurry. The 0.1t/d bench scale unit (BSU) demonstrated stable continuous operations. Ash concentrations in the HPCs were 1000-2000ppm by settling alone, and 300-600ppm by settling-filtration set.
