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Citation: Li Xiao-Ping, Liu Zhi-Hong, Gao Shi-Yang, Hu Man-Cheng, Xia Shu-Ping. The Kinetics of Dissolution and Phase Transformation of 2M •2 B₂O₃•MgCl₂•14H₂O in Water at 87 ℃[J]. Acta Physico-Chimica Sinica, ;2003, 19(02): 181-184. doi: 10.3866/PKU.WHXB20030220 shu

The Kinetics of Dissolution and Phase Transformation of 2M •2 B₂O₃•MgCl₂•14H₂O in Water at 87 ℃

1.
College of Chemistry and Materials Science, Shaanxi Normal University, Xi’an　710062; Xi’an Branch， Institute of Salt Lakes，Chinese Academy of Sciences， Xi’an　710043

Received Date: 18 June 2002
Available Online: 15 February 2003

The kinetics of dissolution and phase transformation of 2M •2B2O3•MgCl2•14H2O in water at 87 ℃ were studied. The results of liquid phases anlysized at a given time intervals and solid phases identified by IR and XRD show that 2M •2 B2O3•MgCl2•14H2O dissolved incongruently in water and the process was not the same at low temperature, a new crystal midproduct (M •B2O3•4H2O) was formed, the final solid phase was pinnoite (M •B2O3•3H2O). With the aid of Simplex Optimum Method and Runge-Kutta Digital Solution of differential equation system, the experimental data was fitted. The kinetic equation of the crystallization reaction was given and a mechanism of crystallization reaction was proposed.
- Chloropinnoite(2M •2 B₂O₃•MgCl₂•14H₂O);Hydrated borate;Dissolution kinetics;Phase transformation;Reaction mechanism
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The Kinetics of Dissolution and Phase Transformation of 2M •2 B2O3•MgCl2•14H2O in Water at 87 ℃

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通讯作者: 陈斌, bchen63@163.com

The Kinetics of Dissolution and Phase Transformation of 2M •2 B₂O₃•MgCl₂•14H₂O in Water at 87 ℃