Method for recleaning vanadium-titanium magnetite concentrate through forging, oxidative alkaline leaching and grading

The invention relates to a method for recleaning vanadium-titanium magnetite concentrate through forging, oxidative alkaline leaching and grading. The method includes the following steps that CaO is added into the vanadium-titanium magnetite concentrate according to the weight proportion of 1 to 0.1-0.2, and forging is performed at the temperature ranging from 800 DEG C to 1400 DEG C; the forged product A is placed in an alkaline solution with the mass concentration being 5-52%; an oxidizing agent is added, then an alkaline leaching reaction is carried out for 0.5-2.5 hours at the temperature of 220-330 DEG C, and filtered liquid and an alkaline leaching filter cake B are obtained; and the filter cake B is graded and recleaned. The method has the advantages that a compound containing S is oxidized by introducing O2 or H2O2 during oxidative alkaline leaching, the reaction is accelerated, the reaction temperature is lowered, and the reaction time is shortened; besides, iron concentrate with the content of TFe being 62-69% and titanium concentrate with the content of TiO2 being 36-52% are graded, the content of impurities, such as TiO2, S, Si and Al, entering a blast furnace is reduced, the utilization coefficient of the blast furnace is increased, and meanwhile the comprehensive utilization rate of titanium resources is increased.