Stabilization of Chromium in Synthetic Slags with FeSO4 and FeS2

Carmen Martinez-Morales; Antonio Romero-Serrano; Beatriz Zeifert; Aurelio Hernandez-Ramirez; Alejandro Cruz-Ramirez; Miguel Perez-Labra

doi:10.1007/s12666-016-0938-0

Stabilization of Chromium in Synthetic Slags with FeSO₄ and FeS₂

Carmen Martinez-Morales, Antonio Romero-Serrano, Beatriz Zeifert, Aurelio Hernandez-Ramirez, Alejandro Cruz-Ramirez, Miguel Perez-Labra

Research output: Contribution to journal › Article › peer-review

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Abstract

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.

Original language	English
Pages (from-to)	1399-1407
Number of pages	9
Journal	Transactions of the Indian Institute of Metals
Volume	70
Issue number	5
DOIs	https://doi.org/10.1007/s12666-016-0938-0
State	Published - 1 Jul 2017
Externally published	Yes

Keywords

Chromium oxide
Iron sulfide
Iron sulphate
Slag
Waste management

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10.1007/s12666-016-0938-0

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title = "Stabilization of Chromium in Synthetic Slags with FeSO4 and FeS2 ",

abstract = "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.",

keywords = "Chromium oxide, Iron sulfide, Iron sulphate, Slag, Waste management",

author = "Carmen Martinez-Morales and Antonio Romero-Serrano and Beatriz Zeifert and Aurelio Hernandez-Ramirez and Alejandro Cruz-Ramirez and Miguel Perez-Labra",

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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

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

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DO - 10.1007/s12666-016-0938-0

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SN - 0972-2815

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JO - Transactions of the Indian Institute of Metals

JF - Transactions of the Indian Institute of Metals

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ER -

Stabilization of Chromium in Synthetic Slags with FeSO₄ and FeS₂

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