Selective Vanadium Separation from V-Bearing Roasted Ore

In this study, a cleaner process of water leaching was proposed to extract vanadium from V-bearing roasted ore with V2O5 content of 1.06 wt.%, and the main mineral compositions of the roasted ore were quartz, gypsum, misenite and munirite. The effects of water leaching parameters such as leaching temperature, leaching time, liquid-solid ratio, leaching agents, stirring intensity and material particle size on vanadium recovery were thoroughly researched in the experimental procedure, as well as the vanadium leaching kinetics in the water leaching process. The results show that V2O5 leaching efficiency can reach 91.29%, and V2O5 content of leaching residue decreased to 0.08 wt.% under the following conditions: roasted ore particle size of - 0.1 mm, leaching temperature of 333 K, leaching time of 150 min, (NH4)(6)Mo7O24 & BULL;4H(2)O dosage of 6 wt.%, liquid-solid ratio of 5:1 mL/g and stirring intensity of 200 rpm. The main findings of vanadium leaching kinetics show that diffusion and chemical reaction control vanadium's action mode in the water leaching process. According to the kinetic model, the apparent activation energy was 32.74 kJ/mol and the frequency factor A = 8.414 s(- 1), which was consistent with standard kinetic theory and experimental results.