The electric arc furnace (EAF) slag could be exploited in several fields of application, such as land filling, road constructions and concrete production. However, their use is limited by the presence of polluting chemical elements (chromium (Cr), barium (Ba), Vanadium(V), etc.) that can be dangerous to humans and the environment. Thus, chemical and structural stability is a fundamental requirement, especially when the slag may come in contact with water. Therefore, the interaction between slag and water is key, in order to classify the slag as a safe raw material. In this work, the effect of slag chemical composition on the chemical leaching of about seventy EAF carbon steel slags of different production steel grades was investigated. Standard leaching tests (24 h at 10 l/kg) in deionized water on slag bulks were performed and the results were correlated with the slag chemical composition. The survey has made possible defining the safe chemical composition areas on the main ternary diagrams, able to transfer stability to the slag. The results obtained indicate the water/slag ratio as the most important factor in the release of polluting substances, also identifying a critical scenario for slag recycling. © 2015 Elsevier Ltd. All rights reserved.

The effect of chemical composition on the leaching behaviour of electric arc furnace (EAF) carbon steel slag during a standard leaching test

MOMBELLI, DAVIDE;MAPELLI, CARLO;BARELLA, SILVIA;DI CECCA, COSMO;
2016-01-01

Abstract

The electric arc furnace (EAF) slag could be exploited in several fields of application, such as land filling, road constructions and concrete production. However, their use is limited by the presence of polluting chemical elements (chromium (Cr), barium (Ba), Vanadium(V), etc.) that can be dangerous to humans and the environment. Thus, chemical and structural stability is a fundamental requirement, especially when the slag may come in contact with water. Therefore, the interaction between slag and water is key, in order to classify the slag as a safe raw material. In this work, the effect of slag chemical composition on the chemical leaching of about seventy EAF carbon steel slags of different production steel grades was investigated. Standard leaching tests (24 h at 10 l/kg) in deionized water on slag bulks were performed and the results were correlated with the slag chemical composition. The survey has made possible defining the safe chemical composition areas on the main ternary diagrams, able to transfer stability to the slag. The results obtained indicate the water/slag ratio as the most important factor in the release of polluting substances, also identifying a critical scenario for slag recycling. © 2015 Elsevier Ltd. All rights reserved.
2016
Chemical composition; Electric arc furnace (EAF) slag; Leaching behaviour; Standard leaching test; Ternary diagrams; Chemical Engineering (miscellaneous); Process Chemistry and Technology; Pollution; Waste Management and Disposal
File in questo prodotto:
File Dimensione Formato  
Effect of chemical composition on slag leaching (JECE).pdf

Accesso riservato

Descrizione: Testo
: Publisher’s version
Dimensione 3.87 MB
Formato Adobe PDF
3.87 MB Adobe PDF   Visualizza/Apri
11311-997788_Mombelli.pdf

accesso aperto

: Post-Print (DRAFT o Author’s Accepted Manuscript-AAM)
Dimensione 3.7 MB
Formato Adobe PDF
3.7 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/997788
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 59
  • ???jsp.display-item.citation.isi??? 54
social impact