Joint reselection method utilizes vanadium-titanium magnetite concentrate calcined, alkali leaching, classification and magnetic reconnection

The present invention discloses a use of the calcined, alkali leaching, and then combined classification and magnetic reconnection method is selected from titanium, vanadium magnetite concentrate, comprising the steps of: CaO concentrate vanadium and titanium added to the magnet 20 was calcined at a temperature of of 800 ℃ ~ 1400 ℃ to 60 minutes to form a calcined product a; product a on the alkali solution concentration of 5% to 52% of the alkaline leaching for 0.5 to 5 hours, filtered to obtain the filtrate B and the alkali leaching the filter cake, the addition of water dubbed B pulp infeed hydrocyclone classification, the classification and the grit overflow C Y, C grit made by adding water and then the mass concentration of 30% to 41% of the pulp magnetic separation and reselection. Advantage of the present invention are: to reduce the consumption of NaOH or KOH, to achieve the vanadium-titanium magnetite concentrate sorting efficient, low alkali consumption, reduce impurities into the blast furnace and Si, Al, improve the capacity factor of a blast furnace, decrease in blast furnace slag emissions, reduce the cost of iron, smelting process to solve the high S content, serious pollution problems; and improve the comprehensive utilization of titanium resources.