Assertion: aluminum's form | /r/HasProperty | refined into alumina
Facets:
value: chemically
type: MANNER
Source sentences:
text: Pure forms of the metal must first be chemically refined into an alumina and then smelted into aluminum through the Hall–Héroult electrolytic reduction process.
text: Pure forms of the metal must first be chemically refined into an alumina and then smelted into aluminum through the Hall–Héroult electrolytic reduction process.