Preparation and mechanism of silicate-based sintering material from large amount of steel slag

Abstract

In this paper, silicate-based sintering materials (SBSM) were prepared by high-temperature sintering process used steel slag as the main raw material. By strictly controlling the particle gradation of steel slag, the content of steel slag in SBSM was increased to 70%, to realize the efficient resource utilization of steel slag. The phase composition and micro-morphology of the SBSM were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. The flexural and compressive strength of the SBSM was tested by the full-automatic compression and folding machine. The results show that the main phases of the SBSM are anorthite and quartz, and the existence of anorthite is benefit to improve the mechanical properties of the SBSM. An appropriate proportion of small-size steel slag (more than 100 mesh) can promote the reaction process, and improve the flexural and compression strength of the samples. However, the excessive amount of steel slag with small-size particles lead to a large amount of liquid phase in the reaction process, which makes the aggregate react with the matrix. This leads to the aggregate can not prevent crack propagation, so that the ability to resist external forces is reduced, and the strength of the sample is reduced. The water absorption of the samples decreases with the increase of the steel slag with small-size particles.

Preparation of Steel-Slag-Based Hydrotalcite and Its Adsorption Properties on Cl− and SO42−

“…Steel slag, a solid waste produced by the iron and steel industry, is currently a focal point of research [10]. Steel slag contains iron, CaO, and MgO, which can be utilized as sintering materials [11]. Additionally, steel slag has been demonstrated to be environmentally friendly and possesses cementing properties when used as a subgrade material [12,13].…”