Assertion: arsenopyrite | /r/HasProperty | converted into valuable pyrrhotite
Facets:
value: in the oxygen-free atmosphere
type: LOCATION
value: mainly
type: DEGREE
Source sentences:
text: Meanwhile, the arsenopyrite (FeAsS) and pyrite (FeS 2 ) in the tailings, mixed with Fe 2 O 3 or Fe 3 O 4 , were mainly converted into valuable pyrrhotite (Fe 1− x S and FeS) and magnetite (Fe 3 O 4 ) in the oxygen-free atmosphere.