Stabilization of chromium-based slags with MgO

Hugo Cabrera-Real, Antonio Romero-Serrano, Beatriz Zeifert, Manuel Hallen-Lopez

Research output: Contribution to conferencePaperResearch

Abstract

This work investigated the chemical and mineralogical properties of CaO-SiO2-CrOx-CaF2-MgO slags. Synthetic slags were prepared and the effect of the slag basicity (CaO/SiO2) and MgO contents on the stability of the mineralogical species formed was analyzed. The morphology and composition of the slags were analyzed by XRD and SEM-EDS, whilst their chemical stability was evaluated by leaching with an aqueous acetic acid solution. It was found that in slags with CaO/SiO2= 1, the main Cr-compound was MgCr2O4spinel, which forms octahedron crystals. Small amounts of CaCr2O4and CaCrO4were also observed. It was found that increasing the slag basicity from 1 to 2 the compounds MgCr2O4and CaCr2O4were formed together with the Cr(V)-containing compound complex Ca5(CrO4)3F which forms hexagonal crystals. The results showed that the highest chromium concentration levels in the leaching liquors corresponded to slags with CaO/SiO2= 2, probably owing to the formation of Ca5(CrO4)3F.
Original languageAmerican English
Pages645-656
Number of pages579
StatePublished - 1 Dec 2010
Externally publishedYes
EventTMS Annual Meeting -
Duration: 14 May 2012 → …

Conference

ConferenceTMS Annual Meeting
Period14/05/12 → …

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Chromium
Slags
Stabilization
Alkalinity
Leaching
Crystals
Chemical stability
Acetic acid
Acetic Acid
Energy dispersive spectroscopy
Scanning electron microscopy
Chemical analysis

Cite this

Cabrera-Real, H., Romero-Serrano, A., Zeifert, B., & Hallen-Lopez, M. (2010). Stabilization of chromium-based slags with MgO. 645-656. Paper presented at TMS Annual Meeting, .
Cabrera-Real, Hugo ; Romero-Serrano, Antonio ; Zeifert, Beatriz ; Hallen-Lopez, Manuel. / Stabilization of chromium-based slags with MgO. Paper presented at TMS Annual Meeting, .579 p.
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Cabrera-Real, H, Romero-Serrano, A, Zeifert, B & Hallen-Lopez, M 2010, 'Stabilization of chromium-based slags with MgO' Paper presented at TMS Annual Meeting, 14/05/12, pp. 645-656.

Stabilization of chromium-based slags with MgO. / Cabrera-Real, Hugo; Romero-Serrano, Antonio; Zeifert, Beatriz; Hallen-Lopez, Manuel.

2010. 645-656 Paper presented at TMS Annual Meeting, .

Research output: Contribution to conferencePaperResearch

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Cabrera-Real H, Romero-Serrano A, Zeifert B, Hallen-Lopez M. Stabilization of chromium-based slags with MgO. 2010. Paper presented at TMS Annual Meeting, .