Assertion: boric acid | /r/HasProperty | produced through process
Facets:
value: from howlite minerals
type: LOCATION
value: from colemanite
type: OTHER
Source sentences:
text: In accordance with the preferred embodiments of the present invention, boric acid is produced from colemanite and or howlite minerals through a process mainly comprising: treating the mineral with sulfuric acid in order to dissolve boron compounds; separating a solution thus formed, from the solids in suspension; reacting said solution with hydrogen sulfide in order to precipitate arsenic and iron impurities contained in the solution; separating the precipitated impurities from the remaining solution; reacting said solution with ammonia in order to precipitate aluminum impurities; separating said aluminum impurities from the remaining solution; reacting the latter with hot sulfuric acid in order to generate boric acid; cooling the reaction mixture so as to precipitate the boric acid; and separating the boric acid from the remaining solution.