Extraction of Vanadium from Stone Coal by Microwave Assisted Sulfation Roasting

The extraction of vanadium from stone coal was investigated by microwave-assisted sulfation roasting followed by water leaching. The results showed that this process is an effective method for the extraction of vanadium from stone coal. Microwave-assisted sulfation roasting promotes the reaction of sulfuric acid with vanadium oxides and decreases roasting time. Under optimized conditions (roasting temperature 200A degrees C, heating rate of 10A degrees C/min, 25% sulfuric acid addition, water leaching at 75A degrees C for 1 h, and liquid/solid ratio of 1.5 ml/g), the leaching rate of vanadium reached 92.6%.