Abstract: For the blast furnace sludge of WISCO,whose iron grade is 37.89%,the physicochemical property and the process mineralogy were studied and the technologies of magnetic separation and gravity separation(shaker and spiral chute) were adopted to recover iron.The research indicated when the technological flowsheet of two-stage gravity separation was adopted,satisfactory indexes with the yield of 31.81%,the iron grade of 61.51% and the iron recovery of 51.64% could be obtained.At the same time,the contents of SiO...