The supersaturated solution of Li2O·2B2O3-H2O containing 26.8% Li2O·2B2O3 were prepared and kept at 20℃ The crystallization processes of Li-borates from the solution has been studied with the kinetic method...The supersaturated solution of Li2O·2B2O3-H2O containing 26.8% Li2O·2B2O3 were prepared and kept at 20℃ The crystallization processes of Li-borates from the solution has been studied with the kinetic method.Two Li-borates, Li2B4O7·3H2O and LiBO2·8H2O crystallized out from Li2O·2B2O3-H2O solution. With the aid of simplex method and digital integration as well as RungeKutta digital solution of differential equation system, the experimental data were fitted and the crystailization kinetic equation of the first solid phase was obtained. The crystallization reaction processes of the two Li-borates were also discussed.展开更多
The supersaturated solution of MgO· 3B2O3 18% MgSO4 H2O was prepared and then reacted under hydrothermal condition at 120℃ . The solid phases of the different time were identified by means of chemical analysis, ...The supersaturated solution of MgO· 3B2O3 18% MgSO4 H2O was prepared and then reacted under hydrothermal condition at 120℃ . The solid phases of the different time were identified by means of chemical analysis, XRD, FT IR, SEM. The results show that the solid phases are spherical and sheet szaibelyite, which is different from those of non hydrothermal condition. On these grounds we suggested the crystallization mechanism of szaibelyite under the hydrothermal condition and then discussed the effects of hydrothermal properties on the crystallization mechanism.展开更多
文摘The supersaturated solution of Li2O·2B2O3-H2O containing 26.8% Li2O·2B2O3 were prepared and kept at 20℃ The crystallization processes of Li-borates from the solution has been studied with the kinetic method.Two Li-borates, Li2B4O7·3H2O and LiBO2·8H2O crystallized out from Li2O·2B2O3-H2O solution. With the aid of simplex method and digital integration as well as RungeKutta digital solution of differential equation system, the experimental data were fitted and the crystailization kinetic equation of the first solid phase was obtained. The crystallization reaction processes of the two Li-borates were also discussed.
文摘The supersaturated solution of MgO· 3B2O3 18% MgSO4 H2O was prepared and then reacted under hydrothermal condition at 120℃ . The solid phases of the different time were identified by means of chemical analysis, XRD, FT IR, SEM. The results show that the solid phases are spherical and sheet szaibelyite, which is different from those of non hydrothermal condition. On these grounds we suggested the crystallization mechanism of szaibelyite under the hydrothermal condition and then discussed the effects of hydrothermal properties on the crystallization mechanism.