Dong Liu, Xiangxin Xue, He Yang
Institute of Metallurgical Resources and Environmental Engineering, Northeastern University, Shenyang, China.
An Acad Bras Cienc. 2020;92(2):e20181062. doi: 10.1590/0001-3765202020181062. Epub 2020 Jul 6.
The influence of magnesium on roasting vanadium slag was investigated by simulating the roasting process of vanadium by mixing V2O5 and MgO. The calcination products of V2O5 reacted with MgO at different temperatures which were characterized by X-ray diffraction (XRD), Thermogravimetry-differential scanning calorimetry (TG-DSC) and scanning electron microscope (SEM). There were two mass loss intervals, three endothermic peaks and one exothermic peak appearing during the reaction by the integrated thermal analysis as the temperature increased from room temperature to 1273.15 K. The samples of mixed V2O5 and MgO began to melt at 573.15 K and reacted at 773 K, and the shape of the particles changed from block to ovoid or irregular sphere at 773.15 K. With increasing the reaction temperature from 973.15 to 1073.15 K, the intermediate of VO2 was produced, and MgV2O6 was partially decomposed at 1073.15 K. During this process, the particle shape gradually returned to block shape. The conversion rate of vanadium is 99.4% with MgO of 1.65%.
通过将V2O5与MgO混合模拟钒的焙烧过程，研究了镁对焙烧钒渣的影响。V2O5的煅烧产物在不同温度下与MgO反应，通过X射线衍射（XRD）、热重-差示扫描量热法（TG-DSC）和扫描电子显微镜（SEM）对其进行表征。当温度从室温升高到1273.15K时，通过综合热分析可知反应过程中有两个质量损失区间、三个吸热峰和一个放热峰出现。V2O5与MgO的混合样品在573.15K开始熔化，在773K发生反应，在773.15K时颗粒形状从块状变为卵形或不规则球形。随着反应温度从973.15K升高到1073.15K，生成了VO2中间体，MgV2O6在1073.15K时部分分解。在此过程中，颗粒形状逐渐恢复为块状。当MgO含量为1.65%时，钒的转化率为99.4%。
