Preparation method of high-formability low-apparent-density reduced iron powder

The invention provides a preparation method of high-formability low-apparent-density reduced iron powder. The preparation method comprises the following steps: preparing canned iron scales, carrying out primary reduction, preparing primary powder and carrying out secondary reduction. According to the reduced iron powder prepared through the method, the apparent density is 2.10-2.25 g/cm , and the Rittoraz value is 0.150%-0.290%; Fe is greater than 97.0%, C is less than 0.10%, Si is less than 0.30%, Mn is less than 0.70%, S is less than 0.060%, P is less than 0.040%, compressibility is greater than 6.25 (g/cm ) (490MPa), and fluidity is less than 50 (sec/50g); the proportion of particles with the particle size larger than 0.18 mm and less than or equal to 0.25 mm is 2-8%; and the proportion of particles with the particle size larger than 0.15 mm and smaller than or equal to 0.18 mm is 10-15%; Waste tailings such as fly ash are used, so that the cost is reduced, the efficiency is improved, and economy and envir