Abstract: The vanadium in a refractory vanadium-bearing stone coal in Xinjiang is distributed in sericite with very fine particles. The traditional roasting system was used for blank roasting to extract vanadium， but there were some problems such as low oxygen concentration and difficult temperature control， and the final leaching rate of vanadium was only about 20%. Therefore， on the basis of fully analyzing the properties of raw ore， a self-designed gas-based roasting system was used to carry out blank roasting test of the stone coal ores. The optimum roasting temperature， roasting time，gas flow and oxygen concentration were determined to be 800 ℃， 20 min， 400 mL/min and 20% by condition test. The roasted samples were obtained under the appropriate condition. Finally， the leaching rate of vanadium can reach 46.51% by acid leaching with fixed concentration of sulfuric acid at 30%， liquid-solid ratio of 1.25∶1， leaching time of 3 h and leaching temperature of 90 ℃. The results showed that the new device has the advantages of low roasting temperature， short roasting time， low selectivity to ore， precise and adjustable roasting atmosphere， which can effectively reduce the production cost and improve the production efficiency.

Key words: blank roasting, phase transformation, acid leaching, leaching rate of the vanadium