Stabilization of MgCr 2O 4 spinel in slags of the SiO 2-CaO-MgO-Cr 2O 3 system

V. Arredondo-Torres; A. Romero-Serrano; B. Zeifert; J. Cruz-Rivera; P. Flores-Sánchez; A. Cruz-Ramírez

Stabilization of MgCr ₂O ₄ spinel in slags of the SiO ₂-CaO-MgO-Cr ₂O ₃ system

V. Arredondo-Torres, A. Romero-Serrano, B. Zeifert, J. Cruz-Rivera, P. Flores-Sánchez, A. Cruz-Ramírez

Escuela Superior de Ingeniería Química e Industrias Extractivas (ESIQIE)

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

23 Scopus citations

Abstract

The objective of this study is to analyze the effect of MgO content and the slag basicity on the stability of the mineralogical species of the SiO ₂-CaO-MgO-Cr ₂O ₃ system. Slag samples were prepared in equilibrium at 1600°C under reducing conditions (pO ₂= 10 ^-9 atm). The MgO content ranged from 0 to 12 mass%, Cr ₂O ₃ was 10% and the slag basicity was held at 1 and 1.5. A thermodynamic analysis was carried out to estimate the most stable mineral phases in the slag. Experimental and calculated results show that Cr ₂O ₃ is mainly bound into MgCr ₂O ₄ spinel phase, even at low MgO content. SEM-EDS results show the evidence of three crystalline structures: (A) Octahedrons which correspond to MgCr ₂O ₄ spinel-type compound; (B) Elongated crystals which belong to calcium silicate compounds and (C) Massive grains that correspond to calcium silicates with impurites of Mg and Cr that did not crystallize completely.

Original language	English
Pages (from-to)	417-424
Number of pages	8
Journal	Revista de Metalurgia (Madrid)
Volume	42
Issue number	6
State	Published - Nov 2006

Keywords

Slag
Spinel

Cite this

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title = "Stabilization of MgCr 2O 4 spinel in slags of the SiO 2-CaO-MgO-Cr 2O 3 system",

abstract = "The objective of this study is to analyze the effect of MgO content and the slag basicity on the stability of the mineralogical species of the SiO 2-CaO-MgO-Cr 2O 3 system. Slag samples were prepared in equilibrium at 1600°C under reducing conditions (pO 2= 10 -9 atm). The MgO content ranged from 0 to 12 mass%, Cr 2O 3 was 10% and the slag basicity was held at 1 and 1.5. A thermodynamic analysis was carried out to estimate the most stable mineral phases in the slag. Experimental and calculated results show that Cr 2O 3 is mainly bound into MgCr 2O 4 spinel phase, even at low MgO content. SEM-EDS results show the evidence of three crystalline structures: (A) Octahedrons which correspond to MgCr 2O 4 spinel-type compound; (B) Elongated crystals which belong to calcium silicate compounds and (C) Massive grains that correspond to calcium silicates with impurites of Mg and Cr that did not crystallize completely.",

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author = "V. Arredondo-Torres and A. Romero-Serrano and B. Zeifert and J. Cruz-Rivera and P. Flores-S{\'a}nchez and A. Cruz-Ram{\'i}rez",

year = "2006",

month = nov,

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volume = "42",

pages = "417--424",

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TY - JOUR

T1 - Stabilization of MgCr 2O 4 spinel in slags of the SiO 2-CaO-MgO-Cr 2O 3 system

AU - Arredondo-Torres, V.

AU - Romero-Serrano, A.

AU - Zeifert, B.

AU - Cruz-Rivera, J.

AU - Flores-Sánchez, P.

AU - Cruz-Ramírez, A.

PY - 2006/11

Y1 - 2006/11

N2 - The objective of this study is to analyze the effect of MgO content and the slag basicity on the stability of the mineralogical species of the SiO 2-CaO-MgO-Cr 2O 3 system. Slag samples were prepared in equilibrium at 1600°C under reducing conditions (pO 2= 10 -9 atm). The MgO content ranged from 0 to 12 mass%, Cr 2O 3 was 10% and the slag basicity was held at 1 and 1.5. A thermodynamic analysis was carried out to estimate the most stable mineral phases in the slag. Experimental and calculated results show that Cr 2O 3 is mainly bound into MgCr 2O 4 spinel phase, even at low MgO content. SEM-EDS results show the evidence of three crystalline structures: (A) Octahedrons which correspond to MgCr 2O 4 spinel-type compound; (B) Elongated crystals which belong to calcium silicate compounds and (C) Massive grains that correspond to calcium silicates with impurites of Mg and Cr that did not crystallize completely.

AB - The objective of this study is to analyze the effect of MgO content and the slag basicity on the stability of the mineralogical species of the SiO 2-CaO-MgO-Cr 2O 3 system. Slag samples were prepared in equilibrium at 1600°C under reducing conditions (pO 2= 10 -9 atm). The MgO content ranged from 0 to 12 mass%, Cr 2O 3 was 10% and the slag basicity was held at 1 and 1.5. A thermodynamic analysis was carried out to estimate the most stable mineral phases in the slag. Experimental and calculated results show that Cr 2O 3 is mainly bound into MgCr 2O 4 spinel phase, even at low MgO content. SEM-EDS results show the evidence of three crystalline structures: (A) Octahedrons which correspond to MgCr 2O 4 spinel-type compound; (B) Elongated crystals which belong to calcium silicate compounds and (C) Massive grains that correspond to calcium silicates with impurites of Mg and Cr that did not crystallize completely.

KW - Slag

KW - Spinel

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M3 - Artículo

AN - SCOPUS:33845543060

SN - 0034-8570

VL - 42

SP - 417

EP - 424

JO - Revista de Metalurgia (Madrid)

JF - Revista de Metalurgia (Madrid)

IS - 6

ER -

Stabilization of MgCr ₂O ₄ spinel in slags of the SiO ₂-CaO-MgO-Cr ₂O ₃ system

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