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