Study on the Law of Steel Slag Characteristics with Particle Size Distribution
ZHANG Liuyang1, CHEN Xiao1,2,*, LYU Guoming3, WANG Benren3, ZHOU Mingkai1,2
1 School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China 2 State Key Laboratory of Silicate, Wuhan University of Technology, Wuhan 430070, China 3 Shanxi Jianlong Industrial Co., Ltd., Yuncheng 044107, Shanxi, China
Abstract: Poor grindability, poor stability and low cementitious activity are the main problems restricting the resource utilization of steel slag in the field of building materials. In this work, the steel slag with different pretreatments was graded into 0—0.6 mm, 0.6—2.36 mm, 2.36—4.75 mm and 4.75—9.5 mm fractions. The chemical composition, mineral composition, grindability, stability, cementitious activity and the relationship between them were studied. The results showed that the grindability of steel slag becomes worse with the increase of steel slag particle size. This was because the content of calcium iron stone (Ca2Fe2O5) and RO phase (MgO·2FeO) increased with the increase of particle size. The f-CaO content, boiling expansion value and autoclave pulverization rate of fine-grained steel slag were lower than those of coarse-grained steel slag. The f-CaO content of 0—0.6 mm steel slag in aged steel slag and hot stuffy steel slag was the least. The cementitious activity of steel slag first increased and then decreased with the increase of particle size, among which 2.36—4.75 mm particle size steel slag was the best. The increased of C3S and C2S content in steel slag was beneficial to the growth of cementitious activity of steel slag. There was a good linear correlation between the chemical composition and mineral composition of steel slag with different particle sizes and the grindability, stability and cementitious activity of steel slag.
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2025, Vol. 39 
