Removal of ash from low grade Indian coal by chemical leaching technique

In this work leaching of low grade Indian coal was investigated. Coal samples of pre-treated and treated were characterized to quantify the quality of coal. An attempt has been made in this work to reduce the mineral matter from low grade coal of particle size 250 μm by leaching with H2SO4, HCl, Na2CO3 and NaOH solution as leaching agent at a temperature of 100°C for 3 h. It was found that the final ash content of treated coal was 22% from 38% of ash of feed raw coal by NaOH treatment alone compared to rest of the solvents.