摘要
采用等温溶解平衡法,测定了三元体系(NaF-Na3PO4-H2O)在293.15 K和323.15 K的溶解度和物化性质。在实验数据的基础上,绘制了293.15 K和323.15 K的物质组成平衡相图。结果表明:在293.15 K和323.15 K三元体系的相图中,均存在三个纯盐结晶区、三条溶解度饱和曲线及两个共饱和点。共饱和点由NaF+Na7(PO4)2F·19H2O和Na3PO4·12H2O+Na7(PO4)2F·19H2O组成。从293.15 K升高到323.15 K,NaF、Na3PO4和Na7F(PO4)2·19H2O均随着温度的增加而增大。测定了三元体系中饱和溶液的密度,并给出了复盐的XRD图谱。
The solubility and physicochemical properties of the ternary system of NaF-Na3PO4-H2O at 293.15 K and 323.15 K were determined by isothermal equilibrium method.On the basis of experimental data,the equilibrium phase diagrams of material composition at 293.15 K and323.15 K were drawn.The results showed that in the phase diagrams of ternary systems at 293.15 K and 323.15 K,there are three pure salt crystallization zones,three solubility saturation curves and two common saturation points.The total saturation point is composed of NaF+Na7(PO4)2 F·19 H2O and Na3PO4·12 H2O+Na7(PO4)2 F·19 H2O.From 293.15 K to 323.15 K,NaF,Na3PO4 and Na7 F(PO4)2·19 H2O all increased with the increase of temperature.The density of saturated solution in ternary system was determined and the new compound salt was analyzed by XRD.
作者
黄兰
李梅
刘兴宇
郝晴
张栋梁
高凯
HUANG Lan;LI Mei;LIU Xing-yu;HAO Qing;ZHANG Dong-liang;GAO Kai(School of Materials and Metallurgy,Baotou 014010,China;Inner Mongolia University of Science and Technology,Key Laboratory of Green Extraction and Efficient Utilization of Light Rare Earth Resources,Ministry of Education,Inner Mongolia University of Science and Technology,Baotou 014010,China;College of Chemistry and Chemical Engineering,Inner Mongolia University,Hohhot 010000,China)
出处
《盐科学与化工》
CAS
2019年第11期20-23,共4页
Journal of Salt Science and Chemical Industry
基金
国家自然科学基金项目(51564042)
内蒙古自然科学基金重大项目(2014ZD04)
内蒙古自治区自然科学基金重大项目(2016ZD05).
关键词
氟化钠
磷酸钠
溶解度
相平衡
Sodium fluoride
Sodium phosphate
Solubility
Phase equilibrium
