引用本文:
李小平, 刘志宏, 高世扬, 胡满成, 夏树屏. 氯柱硼镁石在87 ℃水中的溶解及相转化动力学[J]. 物理化学学报,
2003, 19(02): 181-184.
doi:
10.3866/PKU.WHXB20030220
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
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
氯柱硼镁石在87 ℃水中的溶解及相转化动力学
摘要:
对氯柱硼镁石(2M •2B2O3•MgCl2•14H2O)在87 ℃水中的溶解转化进行了动力学考察.通过对不同时间取出液样的化学分析和不同阶段分离的固相IR和XRD鉴定表明：其高温区溶解转化不同于低温，氯柱硼镁石很快溶脱掉MgCl2，形成晶形的M •B2O3•4H2O中间产物，最终转化产物柱硼镁石（M •B2O3•3H2O）,是由M •B2O3•4H2O脱水后从溶液中大量析出的.提出了溶解及相转化机理,拟合出转化结晶动力学方程.
English
The Kinetics of Dissolution and Phase Transformation of 2M •2 B2O3•MgCl2•14H2O in Water at 87 ℃
Abstract:
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.
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