STUDY ON LEACHING PREVENTION OF HEAVY METALS FROM SIMULATED SEDIMENT BY STEELMAKING SLAG MIXING

Abstract

 Prevention of leaching of heavy metals from a simulated sediment was studied using a steelmaking slag. A mixture was created with a standard solution of metals (Ca, Cd, Cr, Cu, Mn, and Zn) and clay, and a stabilized sediment was prepared by adding converter steelmaking slag. Diffusion tests were performed on these samples to evaluate different leaching behaviors for 64 days. The cumulative leaching ratio of all the elements decreased significantly. In addition, the effective diffusion coefficients of the metals in the simulated and stabilized sediments were calculated based on the diffusion. The effective diffusion coefficient of Ca, Cd, Cr, Cu, Mn, and Zn was approximately 1/25, 1/261, 1/4.7, at least 1/(1.3 x 10⁷), 1/2619, and at least 1/(1.8 x 10⁷) respectively, in the stabilized sediment than in the simulated sediment.