By the method described above, {HEAD ~ a slurry} containing an iron sulfide of {TAIL ~ the invention} is obtained 
By the method described above , { HEAD ~ a slurry } containing an iron sulfide of { TAIL ~ the invention } is obtained
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH