Enhanced characterization for the management of industrial steel processing by products: potential of sequential chemical extraction

Research output: Contribution to journalArticle

Abstract

There is a pressing need for innovative waste management approaches as environmental regulations become more stringent world‐wide alongside increasing demand for a more circular economy. Sequential chemical extraction (SE) analysis, which has previously been applied to environmental media such as soils and sediments, offers the potential to provide an understanding of the composition of solid steel processing by products, aiding the waste classification process and improving environmental protection. The definition of 7‐phase associations through a SE method evaluated in this study were for (1) water – soluble, (2) ion exchangeable, (3) carbonate, (4) amorphous Fe‐Mn Oxides, (5) crystalline Fe‐Mn Oxides, (6) sulfides and (7) silicate residues. Steel waste by‐products (flue dust and filtercake) were evaluated for both extracted
components (ICP analysis) and residual phases (using PXRD, SEM and FTIR), to model the transformations taking place during extraction. Presence and removal of important potentially toxic element (PTE) host solid phases was confirmed during extraction. The SE protocol provides key information, particularly for the
association of potentially toxic elements with the first 3 extracts, which are most sensitive in waste management processes. The water soluble phase is the most available followed by ion‐exchangeable and carbonate fractions, all representing phases more sensitive to environmental change, in particular to pH. This study demonstrates that the distribution of potentially toxic elements such as zinc, lead and copper between sensitive and immobile phases can be reliably obtained in technological process by‐products. We demonstrate that despite heterogeneity as a major variable, even for fine particulate matter, SE can provide more refined classification with information to identify reuse potential and ultimately minimise hazardous waste streams.
LanguageEnglish
Article number192
Number of pages19
JournalEnvironmental Monitoring and Assessment
Volume191
Issue number3
Early online date27 Feb 2019
DOIs
StateE-pub ahead of print - 27 Feb 2019

Fingerprint

Byproducts
steel
Steel
Processing
waste management
Waste management
oxide
Carbonates
carbonate
ion
extraction method
hazardous waste
Oxides
Environmental regulations
Ions
particulate matter
Environmental protection
environmental change
environmental protection
silicate

Keywords

  • sequential chemical extraction
  • metal process by products
  • waste management
  • hazardous waste

Cite this

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title = "Enhanced characterization for the management of industrial steel processing by products: potential of sequential chemical extraction",
abstract = "There is a pressing need for innovative waste management approaches as environmental regulations become more stringent world‐wide alongside increasing demand for a more circular economy. Sequential chemical extraction (SE) analysis, which has previously been applied to environmental media such as soils and sediments, offers the potential to provide an understanding of the composition of solid steel processing by products, aiding the waste classification process and improving environmental protection. The definition of 7‐phase associations through a SE method evaluated in this study were for (1) water – soluble, (2) ion exchangeable, (3) carbonate, (4) amorphous Fe‐Mn Oxides, (5) crystalline Fe‐Mn Oxides, (6) sulfides and (7) silicate residues. Steel waste by‐products (flue dust and filtercake) were evaluated for both extractedcomponents (ICP analysis) and residual phases (using PXRD, SEM and FTIR), to model the transformations taking place during extraction. Presence and removal of important potentially toxic element (PTE) host solid phases was confirmed during extraction. The SE protocol provides key information, particularly for theassociation of potentially toxic elements with the first 3 extracts, which are most sensitive in waste management processes. The water soluble phase is the most available followed by ion‐exchangeable and carbonate fractions, all representing phases more sensitive to environmental change, in particular to pH. This study demonstrates that the distribution of potentially toxic elements such as zinc, lead and copper between sensitive and immobile phases can be reliably obtained in technological process by‐products. We demonstrate that despite heterogeneity as a major variable, even for fine particulate matter, SE can provide more refined classification with information to identify reuse potential and ultimately minimise hazardous waste streams.",
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