Effect of grinding method on properties of steel slag powder
DUAN Siyu1, LI Xi2, MA Zhuohui1, LIAO Hongqiang1, CHENG Fangqin1
1. State Environment Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources, Institute of Resources and Environmental Engineering, Shanxi University, Taiyuan 030006, China; 2. Shanxi Architectural Science Research Institute Co. , Ltd, Taiyuan 030001, China
Abstract：Making the steel slag into powder by the mechanical comminuting process and applying it to the building materials production is an effective way of the steel slag recycling. The steel slag was ground mechanically by a ball mill and a supersonic steam-jet crusher, respectively. The particle size distribution, chemical composition, mineral composition and the activity index of the steel slag powder obtained by the two kinds of grinding methods were compared and analyzed. In addition, the grinding efficiency and energy consumption of the above two grinding methods were also analyzed. The results show that, in comparison steel slag obtained by ball mill, the particle size (D50: 2.06 μm) of the steel slag obtained by the supersonic steam mill is smaller, and the particle size distribution range is narrower, and the particle is more uniform. Obvious chemical component segregation occurs in the steel slag obtained by the supersonic steam-jet crusher, and more Ca and Si elements are enriched in the steel slag with smaller size particles, which is more conducive to the appearance of its gelling activity. Compared with the ball mill, the supersonic steam mill has higher grinding efficiency and lower energy consumption, and it is more suitable for the steel slag grinding.
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2020, Vol. 25 
