摘要
采用等温溶解平衡法研究了三元体系Na_(2)CO_(3)-Na_(3)PO_(4)-H_(2)O在298.15 K、318.15 K和333.15 K下的相平衡关系,并根据热力学数据绘制了水盐相图,测定了该体系各物质组分的溶解度及液相密度和pH值,采用X射线衍射法对平衡固相进行分析鉴定。结果显示,三元体系Na_(3)PO_(4)-Na_(2)CO_(3)-H_(2)O中未发现复盐和固溶体。相图中包括1个全液相区,3个单盐结晶区,1个混合结晶区,1个全固相区,4条单变量溶解度曲线和1个共饱点。共饱点包含Na_(3)PO_(4)·8H_(2)O和Na_(2)CO_(3)·H_(2)O。
The phase equilibrium relationship of Na_(2)CO_(3)-Na_(3)PO_(4)-H_(2)O under 298.15K,318.15 K and 333.15 K were studied by isothermal solubility equilibrium method.The water-salt phase diagram was mapped based on thermodynamic data.The solubility,liquid phase density and pH value of the components of this system were determined by X-ray diffraction.The results showed that Na_(3)PO_(4)-Na_(2)CO_(3)-H_(2)O has no complex salt and solid solute production in the tri-phase system.The phase diagram contains one all-liquid phase,three single-salt crystals,one mixed crystal,one all-solid phase,four single-variable solubility curves and one co-saturation point.The co-saturation points contains Na_(3)PO_(4)·8H_(2)O and Na_(2)CO_(3)·H_(2)O.
作者
刘永刚
卢子钰
柳召刚
LIU Yong-gang;LU Zi-yu;LIU Zhao-gang(School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Key Laboratory of the Ministry of Education for Green Extraction and Efficient Utilization of Light Rare Earth Resources,Key Laboratory of Rare Earth Hydrometallurgy and Light Rare Earth Application,Inner Mongolia Autonomous Region,Baotou 014010,China)
出处
《盐科学与化工》
CAS
2022年第12期15-19,共5页
Journal of Salt Science and Chemical Industry
基金
内蒙古自然科学基金(2022LHMS05022)资助。
关键词
等温溶解平衡法
水盐相图
磷酸钠
碳酸钠
相平衡
Isothermal solution equilibrium method
Water-salt phase diagram
Sodium phosphate
Sodium carbonate
Phase equilibrium
