NaF-Na3PO4-H2O三元体系在293.15K和323.15K的相平衡研究  

Study on Phase Equilibrium for the Ternary System of NaF-Na3PO4-H2O at 293.15K and 323.15K

作　　者：黄兰 李梅[1,2,3] 刘兴宇[2,3] 郝晴 张栋梁 高凯[2] 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)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]内蒙古科技大学轻稀土资源绿色提取与高效利用教育部重点实验室,内蒙古包头014010 [3]内蒙古大学化学与化工学院,内蒙古呼和浩特010000

出　　处：《盐科学与化工》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).

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.

关 键 词：氟化钠 磷酸钠 溶解度 相平衡 

分 类 号：O642.42[理学—物理化学]