Effect of MgO, MnO, and Al2O3 on Vanadium Extraction in Sodium Roasting-Water Leaching Process of Vanadium Slag

The effect of different oxides in vanadium slagVanadium slag, such as MgO, MnO, and Al2O3 on vanadium extractionVanadium extraction in the sodium roasting-water leaching process has been investigated. The results show that the increase of these oxides has a positive influence on the conversion rateConversion rate of vanadiumVanadium. At the condition of sodium roasting, with the increase of MgO, MnO, and Al2O3 contents to 11.49%, 14.22%, and 11.13%, the conversion ratesConversion rate of vanadiumVanadium increased from 89.9% to 97.3%, 98.0% and 95.8%, respectively. With increasing MgO content, more vanadiumVanadium transformed into spinel phase. The roasting and leaching parameters have also been optimized. 97.3% of vanadiumVanadium could be extracted from high MgOHigh MgO vanadium slagVanadium slag at the following conditions: roasting temperature of 800 °C, V/Na molar ratio 0.2; leaching time of 60 min, liquid/solid ratio of 10:1. The results can provide a fundamental basis to the modification of vanadium slagVanadium slag based on slag splashing in vanadium extractionVanadium extraction converter.