TY - GEN
T1 - Stabilization of chromium-based slags with MgO
AU - Cabrera-Real, Hugo
AU - Romero-Serrano, Antonio
AU - Zeifert, Beatriz
AU - Hallen-Lopez, Manuel
PY - 2010
Y1 - 2010
N2 - 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.
AB - 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.
KW - Chromium oxide
KW - Slag
KW - Waste management
UR - http://www.scopus.com/inward/record.url?scp=79952904411&partnerID=8YFLogxK
M3 - Contribución a la conferencia
AN - SCOPUS:79952904411
SN - 9781617822933
T3 - TMS Annual Meeting
SP - 645
EP - 656
BT - EPD Congress 2010 - Held During TMS 2010 Annual Meeting and Exhibition
T2 - EPD Congress 2010 - TMS 2010 Annual Meeting and Exhibition
Y2 - 14 February 2010 through 18 February 2010
ER -