Novel Understanding of Simultaneous Extraction of Vanadium and Manganese from Vanadium Slag and Low-Grade Pyrolusite Based on Selective Oxidation–Reduction Roasting
2020
Wen, Jing | Jiang, Tao | Sun, Hongyan | Yu, Tangxia
Fresh thinking based on selective oxidation–reduction roasting was proposed to recover vanadium and manganese from vanadium slag (VS) and low-grade pyrolusite (LGP) simultaneously. This approach is inspired by the fact that vanadium (V³⁺) in VS needs to be oxidized, while manganese (Mn⁴⁺) in LGP needs to be reduced. X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) were performed to analyze the selective oxidation–reduction mechanism of VS and LGP (VS&LGP). During the roasting process, V³⁺ in VS and Mn⁴⁺ in LGP were initially oxidized and reduced to form Fe₀.₀₇V₁.₉₃O₄ (V⁴⁺) and Mn₂O₃ (Mn³⁺) until it reached a temperature of 670 °C. After reaching 670 °C, Mn³⁺ in LGP gradually oxidized V⁴⁺ and further separated vanadium from iron to form acid-soluble manganese vanadate, by which Mn³⁺ was reduced further as Mn²⁺. The extraction rates of vanadium and manganese from VS&LGP, roasted at 1000 °C and leached with acid, achieved 86.24 and 93.86%, respectively. V₂O₅ and chemical MnO₂ with purities of 99.23 and 91.98% were generated after vanadium and manganese precipitation. Tailings with high iron content and low sulfur content could be returned to blast furnaces for ironmaking. This new method in which VS and LGP were used as additives to each other achieved the efficient and simultaneous recovery of vanadium and manganese.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
تم تزويد هذا السجل من قبل National Agricultural Library