298.16K下K^+,Mg^(2+)//NO_3^-,SO_4^(2-)—H_2O和Na^+,K^+,Mg^(2+)//NO_3^-—H_2O体系的液固相平衡  

Study on the Liquid-Solid Phase Equilibria for the Systems K^+,Mg^(2+)//NO_3^-,SO_4^(2-)—H_2O and Na^+,K^+,Mg^(2+)//NO_3^-—H_2O at 298.16 K

作　　者：杨珍[1] 黄雪莉[1] 肖峰[1] 

机构地区：[1]新疆大学化学化工学院,新疆乌鲁木齐830046

出　　处：《高校化学工程学报》2008年第5期729-732,共4页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金资助项目(200466003);新疆大学中青年骨干教师培养资助项目

摘　　要：采用等温溶解平衡法研究了298.16K下四元体系K+,Mg2+//NO3-,SO42--H2O和Na+,K+,Mg2+//NO3--H2O的液固相平衡,并根据获得的溶解度数据分别绘制出了平衡相图及投影图。结果表明:在298.16K下,四元交互体系K+,Mg2+//NO3-,SO42--H2O相图中有五个单盐结晶区,七条单变量溶解度曲线和三个零变量点。五个单盐结晶区分别对应于KNO3、K2SO4、Mg(NO3)2·6H2O、MgSO4·7H2O和复盐K2SO4·MgSO4·6H2O;具有同离子的四元体系Na+,K+,Mg2+//NO3--H2O相图中有三个单盐结晶区,三条单变量溶解度曲线和一个零变量点。三个结晶区分别对应于NaNO3、KNO3、Mg(NO3)2·6H2O。K2SO4和KNO3的结晶区比较大,Mg(NO3)2·6H2O的结晶区最小。The liquid-solid phase equilibria of the quaternary systems K^＋, Mg^2＋//NO3^-, SO4^2- -H2O and Na^- K^-, Mg^2＋//NO3^- -H2O were studied at 298.16 K by isothermal method. Based on the solubility data obtained, the phase diagram of each system was plotted respectively. The dry salt phase diagram of K^＋, Mg^2-//NO3^-, S04^2- -H2O system consists of five crystallization fields （KNO3, K2SO4, Mg（NO3）2.6H2O, MgSO4.7H2O and double salt K2SO4.MgSO4.6H2O）, seven univariant curves and three invariant points corresponding to KNO3＋K2SO4＋K2SO4.MgSO4.6H2O, KNO3＋MgSOa.7H2O＋K2SO4.MgSO4.6H2O and Mg（NO3）2.6H2O＋ MgSO4.7H2O＋KNO3. The dry salt phase diagram of Na^＋, K^＋, Mg^2＋//NO3^- -H2O system consists of three crystallization fields （NaNO3, KNO3 and Mg（NO3）2. 6H2O）, three univariant curves and one invariant point corresponding to NaNO3 ＋KNO3＋Mg（NO3）2.6H2O. The crystallization region of K2SO4 and KNOB is larger, while that of Mg（NO3）2.6H2O is limited to a smaller domain.

关 键 词：四元体系 硝酸盐 液固相平衡 溶解度 

分 类 号：O642.42[理学—物理化学]