A Raman Investigation on the Boron form Occurring in Salt Lake Brine during Evaporation
投稿时间:2019-04-10  修订日期:2019-05-22
DOI:10.12119/j.yhyj.201902008
中文关键词:  
英文关键词:Raman spectrum  Da Qaidam Salt Lake  evaporation  polyborate species  interaction mechanism
基金项目:
作者单位E-mail
PENG Jiao-yu Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining,810008, China
Qinghai Engineering and Technology Research Center of Salt Lake Resources Development, Xining,810008, China 
pengjy@isl.ac.cn 
CHEN Jing Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining,810008, China
Qinghai Engineering and Technology Research Center of Salt Lake Resources Development, Xining,810008, China
University of Chinese Academy of Sciences, Beijing,100049, China 
 
WANG Xing-peng Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining,810008, China
Qinghai Engineering and Technology Research Center of Salt Lake Resources Development, Xining,810008, China
University of Chinese Academy of Sciences, Beijing,100049, China 
 
DONG Ya-ping Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining,810008, China
Qinghai Engineering and Technology Research Center of Salt Lake Resources Development, Xining,810008, China 
 
LI Wu Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining,810008, China
Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining,810008, China 
 
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中文摘要:
      
英文摘要:
      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)2-6 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)2-6 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.
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