Journal of Northeastern University Natural Science ›› 2015, Vol. 36 ›› Issue (6): 786-790.DOI: 10.12068/j.issn.1005-3026.2015.06.007

• Materials & Metallurgy • Previous Articles     Next Articles

Purification of the Leaching Liquid from the Boron-Rich Slags by the Alkaline Leaching Method Under Ordinary Pressure and the Preparation of Borax

XUE Xiang-xin, DONG Meng-ge, YANG He, SONG Li   

  1. School of Materials & Metallurgy, Northeastern University, Shenyang 110819, China.
  • Received:2014-04-28 Revised:2014-04-28 Online:2015-06-15 Published:2015-06-11
  • Contact: YANG He
  • About author:-
  • Supported by:
    -

Abstract: Based on the alkaline leaching method under ordinary pressure, the generation, removal mechanism and effects of the impurities in the boron leaching liquid were investigated, using NaOH as sodium treatment reagent and boron-rich slags as raw materials. Phase compositions and the morphologies of the precipitates after the purification and crystallization products of borax were analyzed by XRD and SEM. The results indicated that the primary impurities in the boron leaching liquid were Ca2+ and Si4+ impurity. The removal effect with NaHCO3 for Ca2+ was obvious and the optimal amount of NaHCO3 was 3g.There was great effect of the pH value of the leaching liquid on the removal of Si4+ when the pH value was 9.0, the removal rate of Si4+reached its maximum value of 99%. Thus “one-step method” purified technology which combines the process of removing Ca2+ and Si4+ impurity was achieved and with great removal efficiency. Well-crystallized borax was obtained from the purified leaching liquid after treatments of evaporation and concentration.

Key words: boron-rich slag, alkaline leaching method under ordinary pressure, boron leaching liquid, Ca2+ impurity, Si4+ impurity

CLC Number: