Assertion: phosphoric acid | /r/CreatedBy | decomposition of the rock
Facets:
value: with phosphoric acid
type: OTHER
value: to liberate fluoride compounds
type: PURPOSE
value: in the presence of soda
type: OTHER
Source sentences:
text: 1151-3 (1977), that phosphoric acid can be produced from apatite materials such as phosphate rock by decomposition of the rock with phosphoric acid in the presence of soda to liberate fluoride compounds in the form of Na 2 SiF 6 .