The invention discloses a
vanadium extraction technology of low-grade high-
calcium vanadium-containing steel
slag. The technology comprises the following steps of: a, performing pretreatment of the low-grade high-
calcium vanadium-containing steel
slag; b, performing oxidation
calcification roasting of the low-grade high-
calcium vanadium-containing steel
slag; c, performing
carbonation leaching treatment of the vanadium-containing steel slag after the
roasting to obtain vanadium-containing
leachate; d, adding an acid to the vanadium-containing
leachate to precipitate vanadium, and filtering to obtain coarse vanadium; e, performing alkaline
solution treatment of the coarse vanadium, and filtering to obtain V<5+>-containing filtrate; and f, adding NH4Cl into the V<5+>-containing filtrate, reacting to generate NH4VO3, and performing
deamination to obtain V2O5 finally. Through the vanadium extraction technology disclosed by the invention, the requirement on
calcium content is reduced; high-purity vanadium
pentoxide is produced from low-grade high-calcium vanadium-containing steel slag; and the vanadium resource in the vanadium-
titanium magnetite is effectively recycled and utilized. The invention provides conditions for the vanadium extraction of a converter single-link method; and the vanadium-containing molten iron is directly used for
steelmaking, the vanadium enters the low-grade high-calcium steel slag, and an additional converter for vanadium extraction is not needed, thereby avoiding the interference and influence on the
steelmaking caused by the additional vanadium extraction converter for vanadium extraction.