Two-stage curing vanadium extraction method of stone coal vanadium ores

The invention provides a two-stage curing vanadium extraction method of stone coal vanadium ores. The two-stage curing vanadium extraction method comprises the following steps: (1) firstly, breaking and grinding the stone coal vanadium ores, and then adding water and concentrated sulfuric acid to the obtained ore powder and mixing evenly to obtain a mixture, wherein the mass of the concentrated sulfuric acid added accounts for 10%-15% of the mass of the stone coal vanadium ores; (2) curing the mixture, next, leaching the obtained mixture by use of water, and performing liquid-solid separation to obtain a vanadium-containing leaching solution and leaching slag; (3) adding concentrated sulfuric acid to the leaching slag and mixing evenly, next, curing, leaching the obtained mixture by use of water, and performing liquid-solid separation to obtain a vanadium-containing leaching solution and leaching slag, wherein the mass of the concentrated sulfuric acid added accounts for 10%-15% of the mass of the stone coal vanadium ores; and (4) blending the vanadium-containing leaching solution of the step (2) and the vanadium-containing leaching solution of the step (3). The two-stage curing vanadium extraction method of the stone coal vanadium ores has the advantages that side reactions in curing are effectively inhibited and the vanadium leaching rate is greatly increased. A two-stage low-acid curing method is adopted, the acid concentration is relatively low, and the curing process is clean and environment-friendly; and as a result, the two-stage low-acid curing method has a great industrial application prospect.