The efficiency of quartz addition on electric arc furnace (EAF) carbon steel slag stability

JOURNAL OF HAZARDOUS MATERIALS

卷:279

Article

Mombelli, D.¹  Mapelli, C.¹  Barella, S.¹  Gruttadauria, A.¹  Le Saout, G.²  Garcia-Diaz, E.² 

[1] Politecn Milan, Dipartimento Meccan, I-20156 Milan, Italy

[2] Ctr Mat Mines Ales C2MA, Ecole Mines Ales, Inst Mines Telecom, F-30100 Ales, France

关键词: EAF slag;    Leaching behavior;    Liquid-on-solid ratio;    Stabilization process;    Quartz addition;   

DOI  :  10.1016/j.jhazmat.2014.07.045

来源: Elsevier

【 摘 要 】

Electric arc furnace slag (EAF) has the potential to be re-utilized as an alternative to stone material, however, only if it remains chemically stable on contact with water. The presence of hydraulic phases such as larnite (2CaO SiO2) could cause dangerous elements to be released into the environment, i.e. Ba, V, Cr. Chemical treatment appears to be the only way to guarantee a completely stable structure, especially for long-term applications. This study presents the efficiency of silica addition during the deslagging period. Microstructural characterization of modified slag was performed by SEM and XRD analysis. Elution tests were performed according to the EN 12457-2 standard, with the addition of silica and without, and the obtained results were compared. These results demonstrate the efficiency of the inertization process: the added silica induces the formation of gehlenite, which, even in caustic environments, does not exhibit hydraulic behaviour. (C) 2014 Elsevier B.V. All rights reserved.

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