Abstract: The vanadium in a certain illite stone coal in Shaanxi is mainly distributed in illite and titanite in the form of isomorphism， and its distribution rate is 90.32% and 5.37%， respectively. In order to provide basis for the use of vanadium in the coal mine， the experiment of composite additive calcination-water leaching-acid leaching process was carried out. Results showed that under the conditions of composite additive NaCl+K2SO4 dosage of 4%+16%， roasting temperature of 800 ℃， roasting time of 60 min， roasted products with water leaching temperature 90℃， liquid-solid ratio of 4 mL/g， water leaching duration 120 min， water leaching residual with sulfuric acid concentration of 4%， liquid-solid ratio of 4 mL/g， acid leaching temperature of 80 ℃， acid leaching duration 60 min， the water and acid leaching rates of vanadium is 85.06% and 7.94% respectively， the total vanadium leaching rate was up to 93.00%. The experimental results can provide references for the development and utilization of the vanadium bearing stone coal.

Key words: Vanadium extracting from stone coal, Composite additive, Water leaching, Acid leaching