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 2 O 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 2 O 3 was 10 % and the slag basicity was held at 1 and 1.
ResumenEl objetivo de este estudio es analizar el efecto del contenido de MgO y la basicidad de la escoria sobre la estabilidad de las especies mineralógicas del sistema de escoria SiO 2 -CaOMgO-Cr 2 O 3 . Se realizaron ensayos al equilibrio a 1600 °C bajo condiciones reductoras (pO 2 =10 -9 atm). El contenido de MgO fue de 0 a 12 % masa, el Cr 2 O 3 de 10% y la basicidad de 1 y 1,5. También se realizó un análisis termodinámico para determinar las fases mineralógicas más estables en la escoria. Los resultados experimentales y calculados muestran que el Cr 2 O 3 se encuentra principalmente ligado en una fase espinela MgCr 2 O 4 , incluso a bajos contenidos de MgO. Los resultados obtenidos por microscopia electrónica de barrido (MEB-EDS), muestran la evidencia de tres estructuras cristalinas: (A) Octaedros, los cuales corresponden a la espinela MgCr 2 O 4 , (B) Cristales alargados que corresponden a la formación de silicatos cálcicos y (C) Matriz de silicatos cálcicos con impurezas de Mg y Cr que no cristalizaron por completo.
Experimental and theoretical studies were performed in order to estimate the effect of the basicity of the slag as well as the amount of reducing agents on the reduction of chromium oxide from a slag in contact with molten steel at 1600°C. The aim of this work was to compare the efficiency of magnesium and silicon as reducing agents of Cr203' The slag system contained CaO, MgO, Si0 2, CaF 2 and Cr203 together with Fe-alloys (Fe-Si or Fe-Si-Mg). The maximum Cr yield was about 81% with Fe-44%Si-9%Mg and 88% with Fe-75%Si. That means that the reducing effect of Mg was much better than that of Si. Some experiments were conducted to study the effect of initial Cr in steel on the chromium oxide reduction reaction. Three initial Cr contents were tested (0.15, 2 and 4 mass%). It was found that chrome was partially bound into stable spinel phase MgO'Cr203 in the final slag. Thermodynamic estimations were made to determine the effect of process temperature, slag basicity and the amount of reducing agents in the slag on the Cr recovery. The efficiency of Cr reducing agents increased in the order: Si, AI, Ca and Mg. The Cr yield increased with slag basicity and amount of reducing agents.
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