| 大柴旦富硼浓缩盐卤中硼酸镁盐稀释结晶动力学 |
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| 引用本文： | 彭姣玉,张波,陈婧,董亚萍,李武.大柴旦富硼浓缩盐卤中硼酸镁盐稀释结晶动力学[J].无机化学学报,2019,35(10):1821-1833. |
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| 作者姓名： | 彭姣玉 张波 陈婧 董亚萍 李武 |
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| 作者单位： | 中国科学院青海盐湖研究所中国科学院盐湖资源综合高效利用重点实验室;青海省盐湖资源综合利用工程技术中心;中国科学院大学;青海省盐湖资源化学重点实验室 |
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| 基金项目： | 国家青年科学基金（No.21501187），中国科学院西部之光人才培养项目（No.Y710091015）和盐湖化工联合基金面上项目（No.U1607103）资助。 |
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| 摘 要： | 采用动力学法研究了富硼浓缩盐卤稀释过程硼酸镁盐的结晶动力学,重点探讨了温度、稀释比和硼浓度对结晶过程的影响。利用单纯形优化法配合Runge-Kutta微分方程组数值解法对实验数据进行拟合,给出了结晶动力学方程和结晶速率。结果表明,低温、高硼浓度和中间稀释比有利于硼酸镁盐的结晶析出,最优条件下析硼率(以B_2O_3计)高达88%;结晶速率随硼浓度的增加和温度的降低快速增大;反应级数表明稀释结晶过程硼酸镁盐结晶主要受多核表面反应控制,同时提出了结晶相转化机理。
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| 关 键 词： | 含硼盐卤 稀释 结晶动力学 硼酸镁盐 |
| 收稿时间： | 2019/1/23 0:00:00 |
| 修稿时间： | 2019/7/30 0:00:00 |
Crystallization Kinetics of Mg-Borates Precipitating from Diluted Boron-Containing Brine of Da Qaidam Saline Lake |
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| PENG Jiao-Yu,ZHANG Bo,CHEN Jing,DONG Ya-Ping and LI Wu.Crystallization Kinetics of Mg-Borates Precipitating from Diluted Boron-Containing Brine of Da Qaidam Saline Lake[J].Chinese Journal of Inorganic Chemistry,2019,35(10):1821-1833. |
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| Authors: | PENG Jiao-Yu ZHANG Bo CHEN Jing DONG Ya-Ping and LI Wu |
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| Institution: | 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 Comprehensive Utilization of Salt Lake Resources, Xining 810008, China,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 Comprehensive Utilization of Salt Lake Resources, Xining 810008, China,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 Comprehensive Utilization of Salt Lake Resources, Xining 810008, China;University of Chinese Academy of Sciences, Beijing 100049, China,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 Comprehensive Utilization of Salt Lake Resources, Xining 810008, China and 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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| Abstract: | The crystallization kinetics of Mg-borates from different diluted brines was investigated by dynamical method. With the aid of simple optimum method and Runge-Kutta digital solution of differential equations, the experimental data was fitted by computer and the optimum kinetic equations of Mg-borates were obtained. Factors such as temperature, mass dilution ratios and boron concentrations during crystallization were tested. The crystallization rate was also calculated based on the kinetic equations. The results show that low temperature, high boron concentration and medium dilution ratio favor the Mg-borates crystallization. The boron yield would be more than 88% in B2O3 under the optimized condition. The kinetic parameters indicate that almost all of the crystallization mechanisms of Mg-borates in diluted brine are polynuclear layer controlled growth. Besides, the crystallization reactions in diluted solutions were also proposed. |
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| Keywords: | boron-containing brine dilution crystallization kinetics Mg-borates |
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