Vanadium recovery method and device

The invention discloses a vanadium recovery method and device, and relates to the technical field of flow battery electrolyte preparation, and the method comprises the following steps: 1, obtaining vanadium slag: collecting the temperature T1 of vanadium-containing molten iron in a molten pool, the concentration H1 of oxygen blown to the molten pool and the air supply flow V; calculating an actual oxygen amount v1 based on the oxygen concentration H1, wherein v1 = V * H1; based on the temperature T1, the actual oxygen amount h1 and a preset precision oxygen blowing method, oxygen blowing adjustment information is sent to oxygen blowing equipment to adjust the supplied actual oxygen amount v1, and vanadium slag is produced; step 2, roasting; and step 3, leaching: leaching the material obtained by roasting through a solvent, and filtering to obtain a vanadium-containing leachate for preparing vanadium oxide. The method can be used for obtaining enough products while reducing energy consumption and material loss