Assertion: element antimony | /r/HasProperty | produced
Facets:
value: from the ore
type: OTHER
value: by roasting it
type: MANNER
Source sentences:
text: The pure element antimony is produced from the ore by roasting it to form the oxide, then reducing the oxide with carbon or iron; often a flux of sodium sulfate or sodium carbonate is used to prevent loss of molten antimony by evaporation.