Alkali leaching, desliming and V-Ti magnetite concentrate reselection reselection method

The present invention discloses an alkali leaching, desliming and reselection reselection vanadium and titanium magnetite concentrate, comprising the steps of: a vanadium-titanium magnetite concentrate was placed mass concentration of 5 to 52% alkali solution, at 260 ~ alkali leaching reaction at 370 ℃ 0.5 ~ 5 hours and filtered to give the filtrate cake and alkaline leaching a; add a formulated water mass concentration of 21% to 25% of the pulp entering the job desliming, and B to obtain grit overflow C; then B is made by adding water 35 to 40% by mass concentration of the pulp reselection, respectively TFe content of 63 to 68% iron ore concentrate and TiO2 content of 50 to 75% of titanium concentrate. Advantage of the present invention are: the realization of the V-Ti magnetite ore sorting efficient, low alkali consumption, reduce impurities into the blast furnace and Si, Al, especially the content of harmful impurities TiO2, S, improve utilization factor blast furnace, reduce the high slag emissions and reduce ironmaking costs, smelting process to solve the high S content, serious pollution problems; and improve the comprehensive utilization of titanium resources.