Adsorption Study of Electric Arc Furnace Slag for the Removal of Manganese from Solution

Abstract

Problem statement: Steel making slag from Electric Arc Furnace (EAF) is an abundant byproduct in Malaysia steel making industry. It has potential to be used for heavy metal removal from contaminated water or waste water. Approach: The aim of this study was to investigate the characteristic and behavior of manganese removal by using EAF slag for efficient metal removal. The removal characteristics of manganese were investigated in term of sorption kinetics and isotherm. The batch adsorption kinetics and isotherm studies were carried out at 28°C and ten grams of EAF slag was added into 1 L manganese solution of various concentrations of 10, 25, 50, 75, 100 and 120 mg L −1 . All these different mixtures were stirred and sampled at various desired times and centrifuged. The supernatant solutions were then collected for chemical analysis. Results: It was found that the EAF slag adsorption kinetics can be described well by the pseudo-2nd order kinetic model with fairly high correlation coefficients. The adsorption process obeyed the Langmuir isotherm model and the maximum uptake of the manganese from the solution is 2.31 mg L −1 g −1 of EAF slag used. Conclusion:From the study, it was concluded that the EAF slag can be an efficient adsorbent to remove manganese from both the solution and waste water.

The potential utilization of slag generated from iron- and steelmaking industries: a review

“…Thus, when heavy metal exposes into the system, Ca in slag will be exchanged by heavy metal which results in precipitation of heavy metal onto slag or in the solution (Dimitrova 2002). In addition, the reaction occurring between soluble compounds in slag and heavy metals in solution to form hydro-oxo complexes would cause heavy metal removal as well (Beh et al 2010;Dimitrova 1996;Kim et al 2008). The study on the heavy metal removal with the slag before 2011 has been extensively reviewed by other researchers (Ahmaruzzaman 2011;Hashim et al 2011); thus, in this article the related work after 2011 is summarized in Table 2.…”