Tailing micropowder and preparation method thereof

The invention relates to the technical field of solid waste resourceful treatment, and particularly discloses tailing micropowder and a preparation method thereof. The low-grade vanadium titano-magnetite is subjected to the processes of wet grinding, primary magnetic separation, wet grinding and secondary magnetic separation, and treated ore pulp is obtained; a flotation reagent is further added into the treated ore pulp for flotation, flotation ore pulp is obtained, and the flotation reagent is a mixture of oleic acid and polysuccinimide; the flotation pulp is flocculated, the water content is controlled to be smaller than 3%, and a dry matter is obtained; a grinding aid and a modifier are added into the dried product, double-closed-loop internal circulation grinding is carried out, the tailing micro-powder is obtained, the grinding aid is a mixture of desulfurization gypsum, triethanolamine and calcium oxide powder, and the modifier is a mixture of 1-hydroxyethylidene-1, 1-diphosphonic acid, dodecyl trimeth