MgO.1.5B2O3-18%MgCl2-H2O过饱和溶液0°C的结晶动力学研究

Study on Crystallization Kinetics of Mg-borates from MgO.1.5B2O3-18%MgCl2-H2O Supersaturated Solution at 0°C

中文关键词:  硼酸盐,结晶动力学,过饱和溶液

英文关键词:Borate, Crystallization kinetic, Supersaturated solution

中文摘要:

      配制MgO·1.5B2 O3- 18%MgCl2 -H2 O过饱和溶液在 0°C恒温静止 ,对该过饱和溶液结晶析出多水硼镁石 (2MgO·3B2 O3·15H2 O)的动力学过程进行了研究。结晶诱导期较长 ,晶体生长缓慢 ,结晶达平衡需要较长时间。探讨了析出固相的结晶反应机理和硼在溶液中的存在形式 ,并拟合给出结晶动力学方程

英文摘要:

      The supersaturated solution of MgO.1.5B2O3-18%MgCl2-H2O was prepared and kept in thermostat of 0±0.1°C. The crystallization processes of Mg-borate from the solution have been studied by the kinetic method. Inderite (2MgO.3B2O3.15H2O) crystallized out from the solution. The solid phase was identified by chemical analysis, FT-IR spectra, X-ray powder diffration and thermal analysis. The experimental data were fitted and the crystallization kinetic equation was given, meanwhile the reaction mechanism of crystallization was proposed and discussed.