摘要
硫酸体系钍氟各级稳定常数对稀土冶炼生产实践具有重要的指导作用。采用溶解度法测定了室温(25℃)下不同酸度的钍氟共存区,采用氟离子选择电极测定不同浓度氟化氢溶液中的游离氟浓度,得到氢氟各级稳定常数。然后根据钍氟共存区图,配制一系列硫酸钍、氢氟酸和硫酸的混合液,测定各溶液中的游离氟浓度,从而得到钍氟各级稳定常数。结果表明,H与F的第1,2级稳定常数分别为k1=664.4,k2=47.9,Th和F的第1,2,3级稳定常数分别为k1=6.27×105,k2=9.68×104,k3=5.36×104。
The stability constants of thorium（Th） and fluorine（F） in sulfate system are of great importance in directing the practical process of rare earth metallurgy.The coexisting area of Th and F at different acidity was determined at first by solubility method at room temperature（25 ℃）;later,the stability constants of H and F were obtained by measuring the concentration of free F ion in HF solutions.On the basis of the coexisting diagram many mixed solutions of thorium sulfate,hydrofluoric acid and sulfuric acid were prepared and measured in the same way.The stability constants of Th and F could be obtained thereby.The results showed that the stability constants of H and F were k1=664.4,k2=47.9,and that of Th and F were k1=6.27×105,k2=9.68×104 and k3=5.36×104,respectively.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2011年第1期24-28,共5页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金重点项目(50934004)
发改委重大产业技术开发专项(发改办高技【2009】606号)
水体污染控制与治理科技重大专项(2009ZX07529-005)资助
关键词
稳定常数
氟离子选择性电极
钍
氟
stability constant
fluoride ion-selective electrode
thorium
fluorine
