Method for extracting vanadium from shale

A method for extracting vanadium from shale, the method comprising the following steps:

• a) grinding the shale into fine powders, mixing the fine powders with an additive in a mass ratio of 1:0.04-0.12 to yield a mixture, heating the mixture to a temperature of between 850 and 950° C. at a heating rate of 5-9° C./min, and baking the mixture for between 30 and 90 min;
• b) immersing a product resulting from the baking in step a) in water to yield a first solution and a sediment, immersing the sediment in an acid to yield a second solution and a tailing, combining the first and the second solutions to yield a combined solution, and performing ion exchange adsorption on the combined solution using a styrene-divinylbenzene based macroporous anion-exchange resin;
• and
• c) desorbing the styrene-divinylbenzene based macroporous anion-exchange resin to yield a desorption solution, purifying the desorption solution to yield a purified solution, precipitating the purified solution to yield poly ammonium vanadate, and calcining the poly ammonium vanadate at a temperature of between 450 and 530° C. for between 20 and 50 min to yield vanadium oxide (V2O5).