Assertion: hydrogen fluoride's impurity | /r/HasProperty | removed
Facets:
value: effectively
type: MANNER
value: without entailing any secondary contamination
type: MANNER
value: according to the present invention
type: OTHER
value: by adding fluorine thereto
type: MANNER
value: from hydrogen fluoride
type: OTHER
Source sentences:
text: After the ore is dug from mines or from open quarries, impurities are removed to leave a fluorspar which contains a minimum of 97% calcium fluoride.
text: According to the present invention, impurities can be removed effectively from hydrogen fluoride by adding fluorine thereto.
text: Moreover, arsenic impurities can be removed very effectively without entailing any secondary contamination due to the use of the treating chemical unlike the conventional processes.