Effects of Iron on the Acid Leaching for Clinker of the Vanadium Slag by Calcium Roasting

Effects of the factors including iron content of clinker,pH and time on the acid leaching for the clinker of vanadium slag by calcium roasting were researched to resolve the problems of blackening for the leaching solution and decreasing of the leaching rate caused by the iron in the clinker.The results show that the leaching rate of vanadium is 86% with the pH ≈2.8,time=60 min during the leaching process and iron content ≤ 2% in the clinker,and the blackening of the leaching solution can be avoided;The influences of iron on the leaching process can be reduced with the leaching rate>80% when iron content>2% in the clinker,pH ≈3.0 and time=45 min during the leaching process and the storage time ≤ 120 min for the leaching solution.