Boron resources are abundant in the Da Qaidam Salt Lake of the Qaidamu basin in China, which has generated significant attention due to the presence of polyborate species in brine from this lake. In this study, Raman ...Boron resources are abundant in the Da Qaidam Salt Lake of the Qaidamu basin in China, which has generated significant attention due to the presence of polyborate species in brine from this lake. In this study, Raman spectroscopy was used to investigate the existing form of boron in brine during evaporation. MgO·2B2O3 -H2O, MgO·2B2O3 -MgCl2 -H2O, and MgO·2B2O3 -MgSO4 - H2O solutions were also studied to determine the influence of boron concentration, pH, and electrolytes on the borate speciation from brine. The mononborates B(OH)3 and B(OH)4^- were found to be the only forms present in natural salt lake brine. Brine evaporation promoted the formation of the polyborate anions B3O3(OH)4^-,B5O6(OH)4^-, and B6O7(OH)6^2- and also promoted the disappearance of the B(OH)4^- ion from brine at boron concentrations of more than 11 g/L B2O3. The pentaborate ion B5O6(OH)4^- was sensitive to the solution pH and appeared only at pH values less than 8.0. Meanwhile, the hexaborate ion B6O7(OH)6^2- was observed to be more dependent on the electrolyte magnesium chloride due to its special properties, such as promoting boron accumulation, lowering solution pH, and also its strong affinity for water molecules, which were all beneficial for the polymerization of borate ions in brine. Interaction mechanisms between polyborate anions during evaporation are also proposed herein.ake;evaporation;polyborate species;interaction mechanism.展开更多
基金National Natural Science Foundation for the Youth(No.21501187)Qaidam Salt Lake Chemical Scientific Research Joint Foundation of China(No.U1607103)Light of the West Talent Program of the Chinese Academy of Sciences
文摘Boron resources are abundant in the Da Qaidam Salt Lake of the Qaidamu basin in China, which has generated significant attention due to the presence of polyborate species in brine from this lake. In this study, Raman spectroscopy was used to investigate the existing form of boron in brine during evaporation. MgO·2B2O3 -H2O, MgO·2B2O3 -MgCl2 -H2O, and MgO·2B2O3 -MgSO4 - H2O solutions were also studied to determine the influence of boron concentration, pH, and electrolytes on the borate speciation from brine. The mononborates B(OH)3 and B(OH)4^- were found to be the only forms present in natural salt lake brine. Brine evaporation promoted the formation of the polyborate anions B3O3(OH)4^-,B5O6(OH)4^-, and B6O7(OH)6^2- and also promoted the disappearance of the B(OH)4^- ion from brine at boron concentrations of more than 11 g/L B2O3. The pentaborate ion B5O6(OH)4^- was sensitive to the solution pH and appeared only at pH values less than 8.0. Meanwhile, the hexaborate ion B6O7(OH)6^2- was observed to be more dependent on the electrolyte magnesium chloride due to its special properties, such as promoting boron accumulation, lowering solution pH, and also its strong affinity for water molecules, which were all beneficial for the polymerization of borate ions in brine. Interaction mechanisms between polyborate anions during evaporation are also proposed herein.ake;evaporation;polyborate species;interaction mechanism.
