红热钒渣吹氧氧化后碱浸提钒

红热钒渣吹氧氧化仅10min左右,经碱浸压煮提钒,钒浸出率可达90%以上.吹氧过程中,增添CaO,控制合适的MgO与钒渣的重量比,减小供氧速率,可获得高的C_Fe³⁺/C_Fe²⁺.碱浸时,钒浸出率主要随C_Fe³⁺/C_Fe²⁺的增大而升高.保温时间、浸出温度、Na₂CO₃和NaOH的加入比、渣水质量比对钒浸出率都有影响.碱浸压煮时充氧和水洗残渣也可以提高钒的总浸出率.

Extracting Vanadium with Alkaline Leaching after Blowing Oxygen to Hot Vanadium Slag

The hot V slag were first oxidized ouly 10 odd min.with blowing oxygen and then were alkaline leached,the leaching ratio of V come up to 90%.Higher C_Fe³⁺/C_Fe²⁺ can be obtained in case of increasing the addition of CaO into V slag,weight ratio of MgO and slag is controlled in optimum range, and decreasing the rate of oxygen supply in blowing oxygen process,Leaching ratio of V increases major with the increases of C_Fe³⁺/C_Fe²⁺. Holding time,leaching temperature,the addition ratio of Na₂CO₃,and NaOH,and the weight ratio of slag and water influence the leaching ratio of V.The total leaching ratio of V increases with the oxygenation during V slag alkaline autoclave leaching and during residuel slag water leaching.