Abstract
The solubilities of Fe2O3, NiO, and NiFe2O4 have been measured in NaF-AlF3-CaF2-Al2O3 melts as a function of temperature and melt composition. The solubilities of Fe2O3 and NiO for melts containing 1.5 to 6.5 wt% Al2O3 and for bath ratios ranging from 0.7 to 1.5 are represented by the relationships, log wt% Fe = 4.71 − 7080/T, and log wt% Ni = 6.27 − 9740/T, respectively. The solubilities of both Fe2O3, and NiO increased with decreasing concentrations of Al2O3 in the melt, particularly at <1 wt% Al2O3. The solubility of Fe2O3 decreased moderately with decreasing bath ratio (wt NaF/wt AlF3), while no change occurred for NiO. The solubility of NiFe2O4 was less than the solubilities of Fe2O3 and NiO, and there was good agreement between the free energy of formation of NiFe2O3, calculated from the measured solubilities of Fe2O3, NiO, and NiFe2O4, and the free energy of formation reported in the literature.
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