Leaching Behaviors of Chemical Components from Steel Slag

Abstract

The leaching characteristics of chemical components from converter steel slag were studied through circulating leaching experiments. Results show that the most quality of leaching is CaO, SiO2 is the second and Al2O3 is the least. Analyzing the leaching process and experimental results, it can conclude that the leaching kinetics is controlled by intra-paticle diffusion. The leaching process can be described by shrinking unreacted core model.

Remediation of Acid Mine Drainage (AMD) Using Steel Slag: Mechanism of the Alkalinity Decayed Process

“…Possible reactions between slag components and simulated AMD (0.1 M H 2 SO 4 ) were listed in Table 2. The related Gibbs free energy changes for the reactions indicated that the reaction sequence of components with simulated AMD was CaO > MgO > FeO > C 2 S > C 2 F > C 3 S under room temperature [12]. However, some synthetic pure Ca-and Mg-bearing minerals studied by leaching experiments and thermodynamic analysis thought that the leaching order for different phases is CaO > (Ca…”

“…When steel slag was used in unbound and bitumen-bound layers, its acceptable contents of f-CaO and f-MgO should be lower than 7% and 4% [5]. Therefore, it is necessary to promote the steel slag utilization ratios alternatively, such as soil remediation [12], water treatment [13][14][15][16][17], AMD neutralization [9,10] and other promising pollution control applications.…”