Improving coal quality by microwave treatment

摘要

High ash coals are more susceptible towards aerial oxidation and difficult to wash. In this paper, it is observed that washing of high ash coals upto an optimum specific gravity of 1.5-1.6 reduces the fire risk. Microwave treatment followed by Washing and Isodynamic separation further increases the washability characteristics and reduces the liability towards aerial oxidation. Due to conversion of pyrite to highly magentically susceptilbe pyrrhotite and its removal by Isodynamic separation, incubation period increases drastically. Fuel ratio mostly remain unchanged and the Calorific value increases by around 5