文献中Al_(2)O_(3)-MgO二元体系的热力学参数在外推至多元系时与实验数据存在偏差,本工作基于热力学数据的严格评估,采用CALPHAD(calculation of phase diagram)方法对该体系进行热力学重新优化,并在此基础上进一步完善Al_(2)O_(3)-MgO-...文献中Al_(2)O_(3)-MgO二元体系的热力学参数在外推至多元系时与实验数据存在偏差,本工作基于热力学数据的严格评估,采用CALPHAD(calculation of phase diagram)方法对该体系进行热力学重新优化,并在此基础上进一步完善Al_(2)O_(3)-MgO-SiO_(2)体系的热力学描述。优化过程中,采用离子双亚点阵模型描述液相,用CEF(compound energy formalism)化合物能量模型描述固相。所得Al_(2)O_(3)-MgO体系和Al_(2)O_(3)-MgO-SiO_(2)体系的相图热力学计算结果与绝大部分实验数据相吻合,是构建Al_(2)O_(3)-SiO_(2)-MgO-CaO-Fe_(2)O_(3)-Na_(2)O六元体系热力学数据库的基础,并可为大宗铝硅酸盐固废材料化设计与高值化应用提供理论依据。展开更多
Solubilities and properties (density, conductivity and pH value) of solutions in the quaternary system Li +,K +//CO 2- 3,B 4O 2- 7-H 2O at 288 K were experimentally studied with the isothermal equilibrium method. The ...Solubilities and properties (density, conductivity and pH value) of solutions in the quaternary system Li +,K +//CO 2- 3,B 4O 2- 7-H 2O at 288 K were experimentally studied with the isothermal equilibrium method. The phase diagram of the system consisted of two invariant points E and F, five univariant curves, and four crystallization fields that belonged to K 2CO 3·3/2H 2O,Li 2 B 4O 7·3H 2O, K 2 B 4O 7 ·4H 2O and Li 2CO 3. The composition of the solution corresponding to E was w(CO 2- 3)=2.27 %, w(B 4O 2- 7) =6.05 %, w(K + ) =4.30%,w(Li + )=0.30 % and the equilibrium solids were Li 2 B 4O 7· 3H 2O+K 2 B 4O 7·4H 2O+Li 2CO 3;The composition of the solution for F was w(CO 2- 3) =22.45%,w(B 4O 2- 7)=1.88%,w(K + )=29.96%,w(Li + )=0.03% and the equilibrium solids were K 2CO 3·3/2H 2O+ K 2 B 4O 7·4H 2O+Li 2CO 3. K 2CO 3 possesses strong salting-out effect on K 2 B 4O 7,Li 2CO 3 and Li 2 B 4O 7.展开更多
文摘文献中Al_(2)O_(3)-MgO二元体系的热力学参数在外推至多元系时与实验数据存在偏差,本工作基于热力学数据的严格评估,采用CALPHAD(calculation of phase diagram)方法对该体系进行热力学重新优化,并在此基础上进一步完善Al_(2)O_(3)-MgO-SiO_(2)体系的热力学描述。优化过程中,采用离子双亚点阵模型描述液相,用CEF(compound energy formalism)化合物能量模型描述固相。所得Al_(2)O_(3)-MgO体系和Al_(2)O_(3)-MgO-SiO_(2)体系的相图热力学计算结果与绝大部分实验数据相吻合,是构建Al_(2)O_(3)-SiO_(2)-MgO-CaO-Fe_(2)O_(3)-Na_(2)O六元体系热力学数据库的基础,并可为大宗铝硅酸盐固废材料化设计与高值化应用提供理论依据。
文摘Solubilities and properties (density, conductivity and pH value) of solutions in the quaternary system Li +,K +//CO 2- 3,B 4O 2- 7-H 2O at 288 K were experimentally studied with the isothermal equilibrium method. The phase diagram of the system consisted of two invariant points E and F, five univariant curves, and four crystallization fields that belonged to K 2CO 3·3/2H 2O,Li 2 B 4O 7·3H 2O, K 2 B 4O 7 ·4H 2O and Li 2CO 3. The composition of the solution corresponding to E was w(CO 2- 3)=2.27 %, w(B 4O 2- 7) =6.05 %, w(K + ) =4.30%,w(Li + )=0.30 % and the equilibrium solids were Li 2 B 4O 7· 3H 2O+K 2 B 4O 7·4H 2O+Li 2CO 3;The composition of the solution for F was w(CO 2- 3) =22.45%,w(B 4O 2- 7)=1.88%,w(K + )=29.96%,w(Li + )=0.03% and the equilibrium solids were K 2CO 3·3/2H 2O+ K 2 B 4O 7·4H 2O+Li 2CO 3. K 2CO 3 possesses strong salting-out effect on K 2 B 4O 7,Li 2CO 3 and Li 2 B 4O 7.
