Alkali leaching, and graded magnetite concentrate vanadium and titanium reselection reselection method

The present invention discloses a use of alkali leaching, classification and reselection reselection vanadium and titanium magnetite concentrate, comprising the steps of: a vanadium-titanium magnetite concentrate placed in an alkali solution concentration of 5% to 52%, the 260 alkali leaching reaction ℃ ~ 370 ℃ 0.5 ~ 5 hours and filtered to give the filtrate cake and alkaline leaching A; A the water was added to the hydrocyclone classification, classification and the grit overflow B C, then add water B made 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 60% 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.