Study on Sodium-Calcining of Boron Concentrate

Abstract

Boron concentrate obtained from paigeite mineral by magnetic separation was treated by using sodium-calcining method. Mass of NaOH, calcination temperature and time that influence the leaching rate of B2O3 was investigated. Phase compositions and B2O3 leaching rate of sodium roasting products were analyzed by X-ray diffraction and chemical analysis. The results showed that the suitable processing parameters were addition of NaOH 10 times by theoretical mass, calcination temperature 600°C, holding time 4h. Under the above conditions, the leaching rate of B2O3 reached 92.94% when the leaching temperature, leaching time and liquid-solid ratio is 99°C, 2h and 10:1, respectively.