Alkali-activated materials (AAMs) represent a promising alternative to conventional building materials and ceramics. Being produced in large amounts as aluminosilicate-rich secondary products, such as slags, they can be utilized for the formulation of AAMs. Slags are partially crystalline metallurgical residues produced during the high temperature separation of metallic and non-metallic materials in the steelmaking processes. In the present study, the electric arc furnace carbon or stainless steel slag (EAF) and secondary metallurgical slag such as ladle furnace basic slag (LS) were used as precursors in an alkali-activation process. EAF slag, with its amorphous fraction of about 56%, presented higher contents of soluble Si and Al species with respect to ladle slag R (35%). However, both are suitable to produce AAM. The leaching behavior shows that all the release values are below the regulation limit. All the bivalent ions (Ba, Cd, Cu, Ni, Pb, and Zn) are well immobilized in a geopolymeric matrix, while amphoteric elements, such as As and Cr, show a slight increase of release with respect to the corresponding slag in alkaline and aqueous environments. In particular, for Sb and As of AAM, release still remains below the regulation limits, while Mo presents an increase of leaching values that slightly exceeds the limit for landfill non-dangerous waste.

Alkali activation of metallurgical slags: Reactivity, chemical behavior, and environmental assessment / Lancellotti, I.; Piccolo, F.; Traven, K.; Cesnovar, M.; Ducman, V.; Leonelli, C.. - In: MATERIALS. - ISSN 1996-1944. - 14:3(2021), pp. 1-19. [10.3390/ma14030639]

Alkali activation of metallurgical slags: Reactivity, chemical behavior, and environmental assessment

Lancellotti I.
;
Piccolo F.
Investigation
;
Leonelli C.
Writing – Review & Editing
2021

Abstract

Alkali-activated materials (AAMs) represent a promising alternative to conventional building materials and ceramics. Being produced in large amounts as aluminosilicate-rich secondary products, such as slags, they can be utilized for the formulation of AAMs. Slags are partially crystalline metallurgical residues produced during the high temperature separation of metallic and non-metallic materials in the steelmaking processes. In the present study, the electric arc furnace carbon or stainless steel slag (EAF) and secondary metallurgical slag such as ladle furnace basic slag (LS) were used as precursors in an alkali-activation process. EAF slag, with its amorphous fraction of about 56%, presented higher contents of soluble Si and Al species with respect to ladle slag R (35%). However, both are suitable to produce AAM. The leaching behavior shows that all the release values are below the regulation limit. All the bivalent ions (Ba, Cd, Cu, Ni, Pb, and Zn) are well immobilized in a geopolymeric matrix, while amphoteric elements, such as As and Cr, show a slight increase of release with respect to the corresponding slag in alkaline and aqueous environments. In particular, for Sb and As of AAM, release still remains below the regulation limits, while Mo presents an increase of leaching values that slightly exceeds the limit for landfill non-dangerous waste.
2021
14
3
1
19
Alkali activation of metallurgical slags: Reactivity, chemical behavior, and environmental assessment / Lancellotti, I.; Piccolo, F.; Traven, K.; Cesnovar, M.; Ducman, V.; Leonelli, C.. - In: MATERIALS. - ISSN 1996-1944. - 14:3(2021), pp. 1-19. [10.3390/ma14030639]
Lancellotti, I.; Piccolo, F.; Traven, K.; Cesnovar, M.; Ducman, V.; Leonelli, C.
File in questo prodotto:
File Dimensione Formato  
Materials 2021-14- 639-ZAG FLOW.pdf

Open access

Descrizione: Articolo a stampa
Tipologia: Versione pubblicata dall'editore
Dimensione 4.53 MB
Formato Adobe PDF
4.53 MB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1234793
Citazioni
  • ???jsp.display-item.citation.pmc??? 5
  • Scopus 18
  • ???jsp.display-item.citation.isi??? 17
social impact