摘要
根据热力学计算结果,绘制25℃条件下Dy_2O_3(Dy)-HCl-CaF_2-H_2O体系在总镝浓度为0.1mol/L的溶液中各主要溶解组分的lgc-pH图,以及在不同总镝浓度溶液中Dy^(3+)与Ca^(2+)的lgc-pH图,利用热力学平衡图分析钙热还原稀土冶炼渣直接酸浸的可行性。结果表明:钙热还原稀土冶炼渣中可溶解于酸的Dy_2O_3(Dy)易与CaF_2反应重新生成难溶的DyF_3,致使浸出的镝重新沉淀。
Based on the thermodynamic conclusions,the lgc-pH diagrams of dissolved components of Dy2O3 （Dy）-HCl-CaF2-H2O system at 25℃ and total dysprosium concentrate of 0. 1 mol/L are drawed. The lgc-pH diagrams for Dy^3＋ and Ca^2＋ at different total dysprosium concentrations are also drawed. By these diagrams, the feasibility of direct acid leaching of smelting slag which from the process of preparing Dy metal by vacuum calcium thermal reduction is analyzed. The thermodynamic analysis results show that the Dy^3＋ which comes from Dy2O3 （Dy） dissolved in acidic solution easily precipitate with CaF2 as DyF3 to cause reprecipitate of dysprosium dissolved.
出处
《湿法冶金》
CAS
北大核心
2016年第6期469-472,共4页
Hydrometallurgy of China
基金
国家自然科学基金资助项目(51464012)
中国博士后基金特别资助项目(2015T80694)
中国博士后基金资助项目(2013M541879)
江西省教育厅科技项目(GJJ13396)
江西省博士后择优资助项目(2013ky37)
江西省科技厅基金资助项目(20142BDH80025)
关键词
稀土二次资源
氟化钙
溶解
热力学
分析
secondary resource of rare earth
calcium fluoride
decomposition
thermodynamics
analysis
