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Citation: Ma Yu-Tao, Xia Shu-Ping, Gao Shi-Yang. Crystallization Kinetics of Mg-borates from M •3B₂O₃-18％MgSO₄-H₂O Supersaturated Solution[J]. Acta Physico-Chimica Sinica, ;2001, 17(11): 1021-1026. doi: 10.3866/PKU.WHXB20011112 shu

Crystallization Kinetics of Mg-borates from M •3B₂O₃-18％MgSO₄-H₂O Supersaturated Solution

1.
Xi′an Branch,Institute of Salt Lakes,Chinese Academy of Sciences,Xi′an　710043;Institute of Applied Chemistry, Shaanxi Normal University,Xi′an　710062;College of Chemical Engineering, Qinghai University,Xining　810016

Received Date: 6 April 2001
Available Online: 15 November 2001

The supersaturated solution of M •3B2O3-18％MgSO4-H2O was prepared and kept in a thermostat of (20±0.1) ℃.The crystallization processes of Mg-borates from the solution have been studied by the kinetic method .With the aid of simplex optinum method and digital integration as well as runge-kutta digital solution of differential equation system,the experimental data have been fitted and the kinetic parameters have been evaluated by computer.The crystallization kinetic equation has been given.There are two solid phases ,Macallisterite (M •3B2O3•7.5H2O) was firstly crystallized out from the solution and then hungchaoite (M •2B2O3•9H2O).The solid phases were identified by IR-spectra,X-ray powder diffraction and TG-DSC thermal analysis.
- Borate;Supersaturated solution;Crystallization kinetics;　Macallisterite;Hungchaoite
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Crystallization Kinetics of Mg-borates from M •3B2O3-18％MgSO4-H2O Supersaturated Solution

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通讯作者: 陈斌, bchen63@163.com

Crystallization Kinetics of Mg-borates from M •3B₂O₃-18％MgSO₄-H₂O Supersaturated Solution