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

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

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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 languageAmerican English
Pages (from-to)417-424
Number of pages374
JournalRevista de Metalurgia (Madrid)
StatePublished - 1 Nov 2006

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