DEVELOPMENT OF THE BORIC ACID PRODUCTION PROCESS

Wet mixtures which are solved by acid in reactors by using colemanite, ulexide and tincal ores in boric acid factories, filtrated and containing 30-60% solid (boric acid crystals) in the crystallizer unit, are fed to the thickener. The upper current of the thickener is returned to the solution unit as dilute solution; in order to dewater the wet solution whose bottom current is 40-70% H3BO3 crystalline, and to reduce SO4 value, boric acid crystals with maximum %20 humidity rate are obtained by vacuuming at maximum 300 ppm, Humid boric acid crystals taken to vibrating screen from filter exit are fed on the microwave dryer band conveyor at 10 cm. The humid boric acid crystals on the band conveyor are exposed to 1000 watt/unit magnetron power, and dried at 2m/min. Band speed without being subject to vibrating activity. In order to prevent crustation (caking) to take place during production and to ensure that crystal surface temperatures are distributed homogenously, fixed mixers, diffusers, roll grinders are utilized. The dried boric acid crystals are lastly treated in roll and vibrating screen and technical boric acid with 98% -1+0,063 mm size, at maximum 40 °C degrees, with maximum 0,03% humidity, at 0,74-0,95 g/cm3 bulk density, with 99,99% purity and with H3BO3 chemical formulation with minimum 56,25 % B2O3 is produced.