Assertion: tungsten's ore | /r/HasProperty | decomposed by acid leaching
Facets:
value: in order to produce ammonium paratungstate
type: PURPOSE
value: by the autoclave-soda process
type: MANNER
Source sentences:
text: In order to produce ammonium paratungstate (APT), an intermediate compound in production of the pure metal, ores may be decomposed by acid leaching or by the autoclave-soda process.