Method for vanadium-titanium magnetite concentrate by using oxidization alkaline leaching, acid washing, desliming and reverse flotation

The invention relates to a method for a vanadium-titanium magnetite concentrate by using oxidization alkaline leaching, acid washing, desliming and reverse flotation. The method is characterized by comprising the following steps: the oxidization alkaline leaching is to put the vanadium-titanium magnetite concentrate into alkaline solution; an oxidizing agent is added to perform the alkaline leaching reaction for 0.5-2 hours, and is filtered to obtain filtrate and an alkaline leaching filter cake A; the alkaline leaching filter cake A is added with water to prepare pulp, is put in H2SO4 solution to wash by acid for 5-60 minutes at a temperature of 50-90 DEG C, and is filtered to obtain filtrate and acid leaching filter cake B; and the B is added with water to prepare pulp with the mass concentration of 30-35% for desliming and reverse flotation reselection to obtain an iron ore concentrate with the TFe content of 65-70% and a titanium ore concentrate with the TiO2 content of 60-75%. The method has the following advantages: the introduction of O2 or H2O2 in the oxidization alkaline leaching enables an S-contained compound to be oxidized, so that the reaction is accelerated, the reaction temperature is lowered, the reaction time is shortened, and the energy consumption and the equipment investment are largely reduced.