钢铁钒钛2025，Vol.46Issue(6)：29-39,65,12.DOI:10.7513/j.issn.1004-7638.2025.06.003
钒渣高效提取冶金:Na2O-K2O-V2O5体系相平衡试验研究及热力学模型构建
Efficient metallurgical extraction of vanadium slag:Experimental phase diagram study and thermodynamic modeling of Na2O-K2O-V2O5 system
摘要
Abstract
Accurate and reliable thermodynamic databases are of significance for optimizing vanadium extraction and synthesizing vanadate materials.This study employed sealed platinum crucibles com-bined with X-ray diffraction(XRD)and differential thermal analysis(DTA)to confirm the presence of K3V5O14 in the K2O-V2O5 system,melting temperature of K2V8O21 and KVO3 were also determined as 532.4 ℃ and 516.5 ℃,respectively.Modified Quasichemical Model(MQM)was adopted,incorporat-ing short-range ordering of second-neighboring cations in solution to describe changes in Gibbs free en-ergy of solution phases.Thermodynamic model for the Na2O-K2O-V2O5 system was then developed in the framework of CALPHAD(Calculation of Phase Diagrams)methodology,reproducing experimental data across the entire composition range of the system.A self-consistent set of thermodynamic paramet-ers for all phases in the system was obtained,ultimately establishing a reliable thermodynamic database.Furthermore,the developed database was applied to optimize sodium-roasting of vanadium slag at elev-ated temperatures,clarifying the phase evolution of vanadium-containing phases and identifying optim-al operating temperature windows.关键词
Na2O-K2O-V2O5体系/相图/热力学优化/CALPHADKey words
Na2O-K2O-V2O5 system/phase diagram/thermodynamic optimization/CALPHAD分类
矿业与冶金引用本文复制引用
裴贵尚,Sampath Kumar BHARATH,李卓阳,焦梦娇,向俊一,严志明,吕学伟..钒渣高效提取冶金:Na2O-K2O-V2O5体系相平衡试验研究及热力学模型构建[J].钢铁钒钛,2025,46(6):29-39,65,12.基金项目
国家重点研发计划项目(2022YFC3901001) （2022YFC3901001）
国家自然科学基金(U1902217). （U1902217）
