25℃下Na^+,K^+,Mg^(2+)//Cl^-,SO_4^(2-),NO_3^-,H_2O体系液固相平衡  

Liquid-Solid Equilibrium of Na^+,K^+,Mg^(2+)//Cl^-,SO_4^(2-),NO_3^-,H_2O System at 25 ℃

作　　者：黄雪莉[1] 王雪枫[1] 陈丽娟[1] 

机构地区：[1]新疆大学化学化工学院,乌鲁木齐830046

出　　处：《高等学校化学学报》2011年第6期1378-1383,共6页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20466003;20866008);新疆大学博士启动基金项目资助

摘　　要：应用等温溶解平衡法,研究了Na+,K+,Mg2+//Cl-,SO24-,NO3-,H2O六元体系在25℃的氯化钠饱和溶液中的相平衡关系,测定了溶解度,并绘制出相应的相图.研究结果表明,在25℃时,该体系在氯化钠饱和溶液中存在8种复盐,有15个二盐结晶区,25个零变量点;其中只有1个共结点,为Mg(NO3)2.6H2O,NaCl,MgCl2.6H2O,MgSO4.(1～6)H2O和KCl.MgCl2.6H2O五盐共饱点,其余均为反应点.在此基础上,研究了新疆硝酸盐卤水矿蒸发析盐规律.Solubilities in the system Na^＋,K^＋,Mg^2＋//Cl^-,SO4^2-,NO^-3,H2O saturated with NaCl were investigated by isothermal method at 25 ℃.According to experimental data,the phase diagram was plotted.In this system,there are 8 double salts,15 regions saturated with two salts,and 25 invariant points.In these invariant points,one is an incongruent point saturated with Mg（NO3）2·6H2O,NaCl,MgCl2·6H2O,MgSO4·（1—6）H2O,KCl·MgCl2·6H2O,and the others are reaction points.Based on these results,the sequence of crystallization of salts from the brine during evaporation process was discussed.

关 键 词：硝酸盐 相图 六元体系 析盐 

分 类 号：O642[理学—物理化学]