Comparative Research on Extracting Vanadium from Vanadium Slag by Molten Method and Roasting Method

Comparative experiments of extracting vanadium by the molten method'(namely,the method of direct oxidation and sodium treatment of molten vanadium slag to produce water-soluble sodium vanadate) and roasting method were done in the laboratory for maximizing vanadium yield from molten vanadium slag with the new molten method.The result showed that vanadium leaching rate of the molten method was lower than that of the roasting method,and XRD analysis showed that oxidation degree of clinker produced by the molten method was lower than that of the clinker produced by the roasting method.Through analyzing,it was believed that excess temperature and short oxygen blowing time were the main reasons for the result.Some improvement measures for the molten method including reducing temperature while blowing oxygen and extending the time of oxygen blowing were put forward.As a result,the vanadium leaching rate of the molten method attained the same level of the roasting method.