Citation: PENG Jiao-Yu, ZHANG Bo, CHEN Jing, DONG Ya-Ping, 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. doi: 10.11862/CJIC.2019.209 shu

Crystallization Kinetics of Mg-Borates Precipitating from Diluted Boron-Containing Brine of Da Qaidam Saline Lake

PENG Jiao-Yu ^1,2 ,
ZHANG Bo ^1,2 ,
CHEN Jing ^1,2,3 ,
DONG Ya-Ping ^1,2,, ,
LI Wu ^1,4

1.
Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China
2.
Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources, Xining 810008, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China
4.
Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China

Corresponding author: DONG Ya-Ping, Dongyaping@hotmail.com
Received Date: 23 January 2019
Revised Date: 30 July 2019

Figures(7)

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.
- boron-containing brine,
- dilution,
- crystallization kinetics,
- Mg-borates
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沈阳化工大学材料科学与工程学院沈阳 110142