Assertion: calcium phosphate | /r/HasProperty | heated in furnace
Facets:
value: with silica
type: OTHER
value: to produce vaporized tetraphosphorus
type: PURPOSE
value: with carbon
type: OTHER
Source sentences:
text: It is produced commercially from calcium phosphate (phosphate rock): calcium phosphate is heated in a furnace with silica and carbon to produce vaporized tetraphosphorus, which is then condensed into phosphorus as a white powder under water to prevent oxidation.