Evaluation of trace element availability from secondary metallurgical slag generated in steelmaking by sequential chemical extraction

Abstract

During carbon steel manufacture, slag residues are generated to remove material impurities from liquid metal and thus control the quality of carbon steel. As the utilization of secondary metallurgical slags is not as efficient as those of primary slags, a comprehensive characterization of steel ladle slag was performed. Pseudo-total concentrations of a wide range of elements were determined during a 6-week sampling period with relevant physical and chemical properties, sequential extraction of trace elements, and parallel mineralogical characterization of extraction residues from a representative combined sample. According to the results, only Cr and V occurred in elevated concentrations with respective 6-week mean values of 198 and 310 mg kg , d.w., amounting to 41 % of the respective pseudo-total concentration) through, e.g., changes in prevailing redox conditions. Although the analytical approach was validated by the analysis of a certified reference material and the calculation of extraction recoveries, the mineralogical characterization of parallel extraction residues indicated non-selectivity of the procedure coupled with potential redistribution phenomena during extraction with hydrogen peroxide and ammonium acetate.

pH Dependent Leaching Behavior of Zn, Cd, Pb, Cu and As from Mining Wastes and Slags: Kinetics and Mineralogical Control

“…Despite the fact that some of these extraction procedures are standardized (e.g. the SMT sequential extraction procedure), their application for the characterization of waste materials is questionable [28,29].…”

Nickel dynamics influenced by municipal solid waste compost application in tea (Camellia sinensis L.): a cup that cheers

“…Therefore, fractionation of Ni in soil using sequential techniques either through Tessier technique (Tessier et al 1979) or through European Community Bureau of Reference (BCR) procedure is an important tool for chemical characterization that can provide useful information on its potential mobility, availability and assimilation by various parts of plants (Achiba et al 2009). Sequential extraction of Ni makes a possibility to gain a greater insight into identifying how Ni is bound, indicating the MSWC toxicity (Mäkelä et al 2013;Rajapaksha et al 2012).…”