Process 1 characterized in that {HEAD ~ the coal} is impregnated with {TAIL ~ 3.5 to 5 wt% aqueous iron salt solution} 
is impregnated with
Process 1 characterized in that { HEAD ~ the coal } is impregnated with { TAIL ~ 3.5 to 5 wt% aqueous iron salt solution }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL