Assertion: boric acid | /r/ObjectUse | used as a source of b2o3
Facets:
value: on turn
type: TEMPORAL
Source sentences:
text: The present invention refers to a process for the preparation of boric acid from colemanite and/or howlite minerals, and, more particularly, the invention is related with a process for benefice colemanite (2CaO.3B2O3.5H2O) and or howlite (4CaO.5B2O3.2SiO2.5H2O) in order to obtain boric acid which, on turn, is used as a source of B2O3 for the manufacture of glass, ceramics, refractories, etc.