Influence of Residue Recycle on Sodium Roasting of Vanadium Slag

The roasting experiments were carried out with vanadium slag and the residue after vanadium extraction as raw materials,sodium carbonate and sodium chloride as sodium reagents,which aims to reduce the loss of vanadium resources and alleviate the environmental pollution.The effects of roasting temperature,holding time,alkali ratio and alkali-salt ratio on leaching rate of vanadium for samples with different vanadium contents were investigated by ammonium ferrous sulfate titration.The results show that proper addition of the residue can promote the conversion of vanadium.When the content of residue is 16.376%,the optimum calcination temperature is 800 ℃,holding time is 60 min,alkali ratio is 1.5 and alkali-salt ratio is 3.5,the leaching rate of vanadium reaches 98.43%.