摘要
对氯柱硼镁石(2MgO·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MgO·B2O3·4H2O中间产物,最终转化产物柱硼镁石(MgO·B2O3·3H2O),是由MgO·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.
The kinetics of dissolution and phase transformation of 2MgO·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 2MgO·2B2O3·MgCl2·14H2O dissolved incongruently in water and the process was not the same at low temperature, a new crystal midproduct(MgO·B2O3·4H2O) was formed, the final solid phase was pinnoite(MgO·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 reactionwas proposed.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2003年第2期181-184,共4页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(29971032)资助项目~
关键词
氯柱硼镁石
水合硼氧酸盐
溶解动力学
相转化
反应机理
Chloropinnoite(2MgO·2B2O3·MgCl2·14H2O), Hydrated borate, Dissolution kinetics, Phase transformation, Reaction mechanism
