钒钛酸性渣还原过程中钒钛赋存状态的研究

Study on the Occurrence of V,Ti during Reduction Process of the Acidic Vanadium-Titanium Slag

通过分析不同钒氧化物还原率的钒钛酸性渣的XRD和SEM图像,研究了渣还原过程中钒钛的赋存状态。结果表明:钒钛酸性渣的主要物相组成为镁黑钛石、Mg3Al4Ti3O25固溶体物相和镁铝榴石与透辉石的固溶体;随着钒还原率的增加,主要物相基本不变,渣的微观形貌由杂乱到有序,钛由分散到主要富集于镁黑钛石固溶体中,有利于后续钛的回收利用;钒的走向与钛一致,剩余未被还原的钒主要富集在镁黑钛石固溶体中,少量存在于硅酸盐相中,不利于钒、硅、钛的进一步还原分离。

Based on the analysis of XRD and SEM images of the acidic Vanadium - titanium slag with different percent reduction of vanadium oxides, the occurrence characteristics of V, Ti are identified. Research results showed that the main phase of the acidic vanadium-titanium slag was MgTi2O5-Mg3Al4Ti3O25 solid solution and pyrope containing diospide. With the increase of percent reduction of vanadium the micro-phases did not change, but the morphologies and the form of occurrence of V,Ti were changed. During the reduction process, V is reduced into i- ron melt and rest mainly distributed in the MgTi2O5-Mg3Al4Ti3O25 solid solution,and the minor is distributed in pyrope containing diopside phase. As for Ti ,during the reduction process,Ti gradually precipitated from the silicate phase and combined the small block - like phase to develop into the strip - like phase of Mg3Al4Ti3O25-MgTi2O5 solid solution, finally gathered in the phase that is believed to be beneficial for following utilization of titanium.