五元体系K_2^(2+),Mg^(2+)//Cl_2^(2-),SO_4^(2-)-CO(NH_2)_2-H_2O及其边界四元体系MgSO_4-MgCl_2-CO(NH_2)_2-H_2O在25℃时的等温溶度研究  

Studies on the Isothermal Solubility for Quinary System K_2^(2+),Mg^(2+)//Cl_2^(2-),SO_4^(2-)-CO(NH_2)_2-H_2O and Its Boundary System MgSO_4-MgCl_2-CO(NH_2)_2-H_2Oat 25℃

作　　者：张逢星[1] 魏小兰[1] 李珺[1] 

机构地区：[1]西北大学化学系,西安710069

出　　处：《高等学校化学学报》2003年第5期757-760,共4页Chemical Journal of Chinese Universities

基　　金：陕西省教育委员会科研基金

摘　　要：报道了五元体系K_2^(2+),Mg^(2+)//Cl_2^(2-),SO_4^(2-)-CO(NH_2)_2-H_2O在脲不饱和区及其边界四元体系MgSo_4-MgCl_2-CO(NH_2)_2-H_2O在25℃时的等温溶度研究结果,绘制了体系等温溶度的盐分组成图、水量图以及饱和溶液的折光率-组成图.五元体系在脲的参与下,交互反应K_2Cl_2+MgSO_4→K_2SO_4+MgCl_2向有利于生成硫酸钾和软钾镁矾K_2SO_4·MgSO_4·6H_2O(pic.)的方向进行,这两者的相区较无脲时明显增大。The solubilities and the refraction indices, densities and viscosities of the saturated solutions in the title quaternary system have been investigated for the iirst time at 25℃.In the phase diagram there are five crystallization fields corresponding to LiCl·H2O, KCl, MgCl2·6H2O, LiCl·MgCl2·7H2O and KCl·MgCl2·CH2O, respectively. The compositions of the three invariant points are LiCl:44.08, KCl: 3.51, MgCl2:0.65%Wt. (corresponding to KCl+ LiCl·H2O+ KCl·MgCl2· 6H2O); 40.23, 0.62, 5.40 (LiCl·H2O+KCl·MgCl2·6H2O +LiCl·MgCl2·7H2O) and 26.97, 0.15, 14.62 (MgCl2·6H2O+KCl·MgCl2·6H2O+LiCl· MgCl2·7H2O). By using the measured values of the refraction index, density, viscosity, water and chloride ion-content of the saturated solutions of the system, the isograms of these properties are drawn. The iso-density curves intersect with that of the other properties except water-content in a good net form, which may be applied to monitor the isothermal evaporation process of the system quantitatively.

关 键 词：相平衡 溶度图 氯化钾 硫酸钾 氯化镁 硫酸镁 脲 四元体系 盐湖 提取工艺 等温溶度 

分 类 号：TS311[轻工技术与工程] TQ131.13[化学工程—无机化工]