中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 34 No. 6 June 2024 |
（1. College of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, China;
2. College of Vanadium and Titanium, Panzhihua University, Panzhihua 617000, China;
3. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China）
Abstract:The solid-state reaction behavior of MgO-V2O5 mixtures with different molar ratios was explored. The solubility of the solid-state reaction products (magnesium vanadates) in water at 25-55 °C was measured using the isothermal solution saturation method. The dissolution behavior and kinetics of the magnesium vanadates in dilute sulfuric acid were also investigated. The results showed that the molar ratio of MgO to V2O5 and roasting temperature significantly influenced the phase transformation of the solid-state reaction product. MgV2O6 exhibits the highest solubility in water, followed by Mg2V2O7 and Mg3V2O8. The dissolution rate of magnesium vanadates in dilute sulfuric was significantly increased with the decrease of pH from 4.0 to 2.5 and the temperature increase from 30 to 70 °C. The dissolution of magnesium vanadate can be described using a second-order pseudo-homogeneous reaction model.
Key words: vanadium recovery; MgO; V2O5; roasting; leaching; solubility; kinetic
