The differential FT-IR spectroscopic method was used to identify the polyborate anions in aqueous solutions during dissolution and transformation of 2MgO·2B 2O 3 ·MgCl 2·14H 2O in 6.45%H 3BO 3 solution ...The differential FT-IR spectroscopic method was used to identify the polyborate anions in aqueous solutions during dissolution and transformation of 2MgO·2B 2O 3 ·MgCl 2·14H 2O in 6.45%H 3BO 3 solution at 30℃. The recorded IR-spectroscopic frequencies of the borate aqueous solution subtract, with that of water as a bland value and their assignments were given. The existing forms of polyborate anions and thir interaction in three boron-con-taining aqueous solutions have been proposed. On the basis of solution structure, the mechanisms of dissolution and phase transformation of chlorpinnoite in 6.45% H 3BO 3 solution at 30℃ have been discussed.展开更多
The kinetics of dissolution and transformation process of 2MgO·2B2O3·MgCl2·14H2O in 4.5% H3BO3 aqueous solution at 50℃ was studied.The liquid samples were taken at different time for chemical analysis,...The kinetics of dissolution and transformation process of 2MgO·2B2O3·MgCl2·14H2O in 4.5% H3BO3 aqueous solution at 50℃ was studied.The liquid samples were taken at different time for chemical analysis,and the solid phase at different stages was separated and identified.The experimental results showed that 2MgO·2B2O3·MgCl2·14H2Odissolved congruently in 4.5%H3BO3aqueous solution,which was different from the process of the dissolution of 2MgO·2B2O3·MgCl2·14H2O in water.The final solid phase was kurnakovite（2MgO·3B2O3·15H2O）.The kinetic equations of the crystallization reaction were given with the aid of Simplex Optimum Method and Runge-Kutta digital solution of differential equation system.The mechanism of dissolution and transformation were proposed and discussed.展开更多
The FT-IR difference spectroscopy and the Raman spectroscopy were used to ide ntify the polyborate ions in saturated aqueous solutions during dissolution and transformation of 2MgO·2B2O3·MgCl2·14H2O in ...The FT-IR difference spectroscopy and the Raman spectroscopy were used to ide ntify the polyborate ions in saturated aqueous solutions during dissolution and transformation of 2MgO·2B2O3·MgCl2·14H2O in different HCl solutions at 30℃. The assignments of the recorded IR-Spectroscopic frequencies and Raman shift of the borate aqueous solution are given. The existing forms of polyborate anions in saturated aqueous solution and their interaction have been discussed. The rel ationships between the existing forms of polyborate anions and the crystallizing solid phases have been gained.展开更多
The phase transformation of 2MgO·2B 2O 3·MgCl 2·14H 2O H 2O sytem at boiling point has been studied.The final inversion product is 2MgO·B 2O 3·2H 2O,which was determined by chemical analysis a...The phase transformation of 2MgO·2B 2O 3·MgCl 2·14H 2O H 2O sytem at boiling point has been studied.The final inversion product is 2MgO·B 2O 3·2H 2O,which was determined by chemical analysis and identified by infrared spectra and X ray diffractometry.The mechanism of dissolution and phase transformation has been proposed and discussed.展开更多
文摘The differential FT-IR spectroscopic method was used to identify the polyborate anions in aqueous solutions during dissolution and transformation of 2MgO·2B 2O 3 ·MgCl 2·14H 2O in 6.45%H 3BO 3 solution at 30℃. The recorded IR-spectroscopic frequencies of the borate aqueous solution subtract, with that of water as a bland value and their assignments were given. The existing forms of polyborate anions and thir interaction in three boron-con-taining aqueous solutions have been proposed. On the basis of solution structure, the mechanisms of dissolution and phase transformation of chlorpinnoite in 6.45% H 3BO 3 solution at 30℃ have been discussed.
文摘The kinetics of dissolution and transformation process of 2MgO·2B2O3·MgCl2·14H2O in 4.5% H3BO3 aqueous solution at 50℃ was studied.The liquid samples were taken at different time for chemical analysis,and the solid phase at different stages was separated and identified.The experimental results showed that 2MgO·2B2O3·MgCl2·14H2Odissolved congruently in 4.5%H3BO3aqueous solution,which was different from the process of the dissolution of 2MgO·2B2O3·MgCl2·14H2O in water.The final solid phase was kurnakovite（2MgO·3B2O3·15H2O）.The kinetic equations of the crystallization reaction were given with the aid of Simplex Optimum Method and Runge-Kutta digital solution of differential equation system.The mechanism of dissolution and transformation were proposed and discussed.
文摘The FT-IR difference spectroscopy and the Raman spectroscopy were used to ide ntify the polyborate ions in saturated aqueous solutions during dissolution and transformation of 2MgO·2B2O3·MgCl2·14H2O in different HCl solutions at 30℃. The assignments of the recorded IR-Spectroscopic frequencies and Raman shift of the borate aqueous solution are given. The existing forms of polyborate anions in saturated aqueous solution and their interaction have been discussed. The rel ationships between the existing forms of polyborate anions and the crystallizing solid phases have been gained.
文摘The phase transformation of 2MgO·2B 2O 3·MgCl 2·14H 2O H 2O sytem at boiling point has been studied.The final inversion product is 2MgO·B 2O 3·2H 2O,which was determined by chemical analysis and identified by infrared spectra and X ray diffractometry.The mechanism of dissolution and phase transformation has been proposed and discussed.
