The solubility of the picrochromite MgO·Cr2O3 into MgO-Al2O3-SiO2 melts were measured at 1 600°C in air, to understand the bahavior of smelting reduction of chromite ore. The solubility of picrochromite were 1.1-4.5wt% Cr2O3 in MgO-SiO2-Cr2O3 melts. In MgO-CaO melts, they were as much as 40-55wt% CrOx, although more than 50% of chromium exists as Cr6+ in the high CaO and low MgO region. The solubility of the picrochromite increased from 0.2-0.8wt% Cr2O3 to 0.5-2.6wt% Cr2O3 by adding CaO to the MgO-Al2O3-SiO2 melts. For Al2O3 containing melts, the chromium in the chromite MgO·Cr2O3 was substituted by aluminum in proportion to Al2O3 content in the melt.
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Morita et al. (1988) studied this question.
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