Effect of vanadium occurrence state on the choice of extracting vanadium technology from stone coal

The extraction technology of vanadium from stone coal by means of no-salt-roasting and dilute acid solution leaching treatment has the advantages of low pollution,low investment,as well as high vanadium leaching efficiency,which makes it the best technology for extendingapplication.In the present study,the effects of vanadium occurrence state in stone coal,roasting temperature and additive agent on the leaching efficiency of vanadium were studied.The results indicate that the effect of vanadium occurrence state on the extracting vanadium technology is obvious.If the vanadium component in stone coal existed in amorphous phase form,this type of stone coal can be treated by no-slat-roasting and dilute acid solution leaching technology; while the vanadium-bearing crystalline phase existed in stone coal,the roasting additive must be added to destroy this crystalline form so as to acquire high vanadium leaching rate.