The Study on Leaching Vanadium from Stone Coal with Alkali

This study used the technique of pelletization-oxidation roasting-alkali leaching to extract vanadium from stone coal,the effects of roasting temperature,roasting time,leaching temperature,leaching agent concentration,leaching time,leaching L/S were investigated.With this technique,it has got a result of leaching rate was as high as 88.38%.The results indicate that roasting temperature,leaching temperature,leaching agent concentration,leaching time were the main factors which affect the leaching rate.The best technique condition is: roasting temperature is 850℃,roasting time is 3h,leaching temperature is 90℃,leaching agent concentration is 2 mol/L,leaching time is 2h,and leaching L/S is 3.