A PROCESS TO PRODUCE HIGH QUALITY CLEAN COAL FROM HIGH ASH COAL WITH ENHANCED YIELD

摘要

The invention relates to an improved process to produce low ash clean coal from high ash coal with high recovery of enhanced quality of clean coal, the process comprising forming a slurry of coal fines in organic solvent with a small amount of co-solvent; maintaining said slurry in a reactor at a temperature range of 1OO°C to 240°C and at a pressure range of 1 to 4 gauge (kg/cm2) for a period of about 15 minutes to 4 hours; separating the produced product after withdrawal from the reactor in a separation unit, separation cut size being variable depending on the particle size to be treated including application of the end product, a first part of the separated product being a filtrate or extract and a second part being a reject; washing the reject in an anti solvent by adding second part called reject; drying the reject by a horizontal dryer, said separated reject having high ash content; feeding the extracted part into an evaporator to recover solvents; feeding the concentrated material (bottom product of evaporator) into a vertical dryer to separate coal from solvent, said separated coal having a reduced ash content