Assertion: tungsten's ore | /r/HasProperty | treated with alkali
Facets:
value: to produce wo
type: PURPOSE
value: to form tungsten trioxide
type: PURPOSE
Source sentences:
text: Tungsten ores are crushed, cleaned and treated with alkalis to form tungsten trioxide (WO 3 ).
text: Tungsten ores are treated with alkalis to produce WO 3 .