Assertion: calcium oxide | /r/ObjectUse | used as refractory material
Facets:
Source sentences:
text: Calcium oxide is used as a refractory material; as a flux in steelmaking; as a binding agent in building, pulp and paper manufacture, sugar refining, and leather tanning; as the raw material for chlorinated lime bleaching powder, and as a soil treatment in agriculture (Encyclopedia of Occupational Health and Safety, Vol. 2, p. 1234, International Labour Office 1983).