Abstract: Carried out the calcified roasting test to vanadium slag from pangang, investigated the influencing factors to roasting effect including the vanadium slag granularity, ratio of calcium to vanadium, roasting temperature, roasting time, and thermal analysis to the roasting process. The results show that: under the conditions of the granularity of vanadium slag at -140 mesh, the ratio of calcium to vanadium at 0.62, roasting temperature at 900 ℃,roasting for 150 min, the effect of calcified roasting is better, and the leaching rate of vanadium can reach to above 91%; the process of calcified roasting is oxygenolysis of vanadium slag first, and then direction action with calcium carbonate at 680 ℃ to produce Ca-containing vanadates.

Key words: Vanadium slag, Calcified roasting, Influencing factors, Immersion ratio