TY - JOUR
T1 - Stabilization of Chromium in Synthetic Slags with FeSO4 and FeS2
AU - Martinez-Morales, Carmen
AU - Romero-Serrano, Antonio
AU - Zeifert, Beatriz
AU - Hernandez-Ramirez, Aurelio
AU - Cruz-Ramirez, Alejandro
AU - Perez-Labra, Miguel
N1 - Publisher Copyright:
© 2016, The Indian Institute of Metals - IIM.
PY - 2017/7/1
Y1 - 2017/7/1
N2 - In this work, the effects of the slag basicity (mass ratio CaO to SiO2) and the addition of FeSO4 or FeS2 into the slag on the stability of the mineralogical species in the slag containing chromium compounds were studied. The chemical stability was evaluated by leaching the slags with an acid solution. The main Cr-compounds in slags with low basicity (CaO/SiO2 = 1) and FeSO4 were FeCr2O4 and Ca3Cr2Si3O12, while Cr3S4 and Ca3Cr2Si3O12 were formed in slags with FeS2. The slags with high basicity (CaO/SiO2 = 2) and FeSO4 contained CaCr2O4, FeCr2O4 and Ca5(SiO4)2SO4. The slags with FeS2 and high basicity produced FeS·Cr2S3, FeCr2O4 and Ca3Cr2Si3O12. The results showed that the lowest chromium concentration levels in the leaching liquors corresponded to slags with CaO/SiO2 = 1 and high FeS2 contents, owing to the stable binding of chromium in the compounds FeCr2O4, Cr3S4 and Ca3Cr2Si3O12.
AB - In this work, the effects of the slag basicity (mass ratio CaO to SiO2) and the addition of FeSO4 or FeS2 into the slag on the stability of the mineralogical species in the slag containing chromium compounds were studied. The chemical stability was evaluated by leaching the slags with an acid solution. The main Cr-compounds in slags with low basicity (CaO/SiO2 = 1) and FeSO4 were FeCr2O4 and Ca3Cr2Si3O12, while Cr3S4 and Ca3Cr2Si3O12 were formed in slags with FeS2. The slags with high basicity (CaO/SiO2 = 2) and FeSO4 contained CaCr2O4, FeCr2O4 and Ca5(SiO4)2SO4. The slags with FeS2 and high basicity produced FeS·Cr2S3, FeCr2O4 and Ca3Cr2Si3O12. The results showed that the lowest chromium concentration levels in the leaching liquors corresponded to slags with CaO/SiO2 = 1 and high FeS2 contents, owing to the stable binding of chromium in the compounds FeCr2O4, Cr3S4 and Ca3Cr2Si3O12.
KW - Chromium oxide
KW - Iron sulfide
KW - Iron sulphate
KW - Slag
KW - Waste management
UR - http://www.scopus.com/inward/record.url?scp=84982854549&partnerID=8YFLogxK
U2 - 10.1007/s12666-016-0938-0
DO - 10.1007/s12666-016-0938-0
M3 - Artículo
SN - 0972-2815
VL - 70
SP - 1399
EP - 1407
JO - Transactions of the Indian Institute of Metals
JF - Transactions of the Indian Institute of Metals
IS - 5
ER -