Stabilization of chromium-based slags with MgO

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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 MgCr2O4 spinel, which forms octahedron crystals. Small amounts of CaCr2O4 and CaCrO4 were also observed. It was found that increasing the slag basicity from 1 to 2 the compounds MgCr2O4 and CaCr2O4 were formed together with the Cr(V)-containing compound complex Ca 5(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 languageEnglish
Title of host publicationEPD Congress 2010 - Held During TMS 2010 Annual Meeting and Exhibition
Pages645-656
Number of pages12
StatePublished - 2010
Externally publishedYes
EventEPD Congress 2010 - TMS 2010 Annual Meeting and Exhibition - Seattle, WA, United States
Duration: 14 Feb 201018 Feb 2010

Publication series

NameTMS Annual Meeting

Conference

ConferenceEPD Congress 2010 - TMS 2010 Annual Meeting and Exhibition
Country/TerritoryUnited States
CitySeattle, WA
Period14/02/1018/02/10

Keywords

  • Chromium oxide
  • Slag
  • Waste management

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