湿法冶金2025，Vol.44Issue(5)：592-596,612,6.DOI:10.13355/j.cnki.sfyj.2025.05.002
钒渣浸出液Mg-Si-V-H2O体系的热力学分析及硅的选择性分离研究
Thermodynamic Analysis of Mg-Si-V-H2O System and Selective Separation of Silicon from Vanadium Slag Leaching Solution
摘要
Abstract
During the process of extracting vanadium from vanadium slag by sodium roasting-water leaching method,silicon in the leaching solution will react with alkali to form sodium silicate and enter the solution,affecting the recovery rate and quality of the product.To address this issue,the selective precipitation of silicon in vanadium leachate by the magnesium salt method was studied.Thermodynamic equilibrium diagrams of the Mg-Si-V-H2O system were constructed to investigate the distribution characteristics of free ions within the pH range of 7～14.Additionally,the relationship between pH and precipitation saturation indices was established to evaluate the precipitation behaviors of MgSiO3 and Mg(VO3)2 under different pH conditions.The calculation results reveal that the solubility of MgSiO3 is relatively low,while that of Mg(VO3)2 is relatively high,which can achieve the selective precipitation of silicon in the vanadium leaching solution.The verification test results demonstrate that the pH of the solution has a significant influence on the precipitation rate of silicon in the vanadium leaching solution.When pH=10,the silicon precipitation rate can reache 86.3％,and the vanadium loss rate is only 3.2％,with a good effect.关键词
钒渣/硅/氯化镁/沉淀/热力学分析Key words
vanadium slag/silicon/magnesium chloride/precipitation/thermodynamic analysis分类
矿业与冶金引用本文复制引用
韦林森,潘少彦,李煊,向小艳..钒渣浸出液Mg-Si-V-H2O体系的热力学分析及硅的选择性分离研究[J].湿法冶金,2025,44(5):592-596,612,6.基金项目
国家自然科学基金资助项目(52174331). （52174331）
