When this iron sulfide is added in {HEAD ~ a large amount} to treat a fly ash or {TAIL ~ soil} containing heavy metals in a high concentration, the waste thus treated has too high a water content and is hence difficult to handle thereafter 
to treat
When this iron sulfide is added in { HEAD ~ a large amount } to treat a fly ash or { TAIL ~ soil } containing heavy metals in a high concentration , the waste thus treated has too high a water content and is hence difficult to handle thereafter
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH