Study on Vanadium Phase Evolution Law in Vanadium Slag During the Interface Reaction Process of Sodium Roasting

Vanadium slag is composed of many complex phases with various kinds of elements, occurrence forms, and chemical forms. At present, sodium roasting–water leaching can effectively extract vanadium; this technique has been widely used in industrial production, but the current researches to evolution law of the V-concentrating phase in V-slag during the roasting process focus on the macro-level, not directly on micro-level and especially at interface reaction process. Consequently, the microstructure, phase compositions, mineralogical morphology, and elements distribution on the surface of vanadium slag during the roasting process were investigated by various surface analysis techniques. It is essential to truly understand and control the sodium roasting–water extraction process, so the atomic evolution law can be of a great significance to optimize operating conditions in order to raise vanadium recovery rate.