'a process for enrichment of reactive materials in coal'

摘要

The invention relates to a process for enrichment of reactive macerals in coal (both non-coking and coking), comprising the steps of : providing a coal sample having ash-content in a range of 7-16% on dry basis and a crucible swelling number ranging between 0-6; subjecting the coal sample to grinding through a shearing technique; and separating the crusted coal by a 0.5 mm screen and collecting a size fraction of 0.5 mm, wherein hardgrove grindability index(HGI) of the coal sample above 80 exhibits high responsiveness to shearing to generate large volume of reactives.