AN IMPROVED BENEFICIATION PROCESS TO PRODUCE LOW ASH CLEAN COAL FROM HIGH ASH COALS

摘要

The invention relates to an improved beneficiation process to produce low ash clean coal from high ash coals, comprising the steps of preparing a coal slurry carrying-out a leaching reaction between the coal and an aqueous alkali solution, washing to produce a filter cake feeding the coal slurry prepared from said filter cake into a reactor for washing in a diluted acid carrying-out different leaching reaction sequence the dried filter cake being taken up for physical, chemical, rheological, petroggraphical analysis.