Skip to main content
SLU publication database (SLUpub)

Abstract

Secondary desulphurization slag from integrated carbon steelmaking was investigated to attain information on respective utilization possibilities or effects upon final disposal. Pseudo-total element concentrations were determined during a six-week sampling period with EN 12457-2/12457-3 compliance test recoveries, scanning electron microscopy + X-ray microanalysis (SEM-EDS) and trace element fractionation with supportive X-ray diffraction (XRD) of parallel extraction residues. Only trace elements Cr and V showed significant pseudo-total recoveries with 210 and 1270 mg kg(-1) (d.w.), respectively. 88% of the respective Cr was attained in the residual fraction of the extraction procedure, as a labile H2O-extractable Cr(VI) concentration of 1.6 mg kg(-1) (d.w.) was attained during the EN 12457-2 test. The RSD value of Cr (32%) in the determined pseudo-total contents of weekly subsamples indicated that fluctuation in slag composition can have a significant effect on the trace element contents of the material. In the case of V, 28% (353 mg kg(-1), d.w.) of the respective pseudo-total concentration was recovered in the NH2OHHCl-extractable fraction, in which XRD suggested only the potential dissolution of larnite. A majority of V (i.e., 65%) was recovered in the residual fraction coupled with the potential dissolution of magnetite and merwinite, as recovery in the HOAc-extractable fraction remained below the limit of quantitation. Additional SEM-EDS investigations proved unsuccessful in exclusively identifying potential V association in the slag samples due to overlapping with additional peaks. (C) 2014 Elsevier B.V. All rights reserved.

Keywords

Chemical extraction; Certified reference material; Steel slag; Trace element; Waste

Published in

International Journal of Mineral Processing
2015, volume: 134, pages: 29-35
Publisher: ELSEVIER SCIENCE BV

SLU Authors

  • Mäkelä, Mikko

    • Aalto University

UKÄ Subject classification

Other Chemistry Topics

Publication identifier

  • DOI: https://doi.org/10.1016/j.minpro.2014.11.006

Permanent link to this page (URI)

https://res.slu.se/id/publ/71157