Assertion: boric acid | /r/AtLocation | accordance
Facets:
value: with the present invention
type: OTHER
value: from alkali metal borate ore
type: OTHER
value: by treating the ore
type: MANNER
Source sentences:
text: In accordance with the present invention, boric acid can be produced from alkali metal borate ore by pre-treating the ore with concentrated sulfuric acid in an amount to provide an alkali metal to sulfur mole ratio of from approximately 1.5 to approximately 2.5 and preferably from approximately 1.9 to approximately 2.1, followed by contacting the pre-treated ore in a suitable reaction zone with superheated steam preferably at temperatures ranging from 100 to 600 C., stripping the gaseous boron-containing material from the reaction zone in the gaseous effluent containing superheated steam and recovering boric acid from the gaseous material.