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.