Abstract
The solubility of indium was measured in the low-silica region (<20 mass pct SiO2) of the CaO-Al2O3-SiO2 system by a thermochemical equilibration technique. The dissolution mechanism of indium into the CaO-Al2O3-SiO2 slag at 1773 K (1500 °C) under a reducing atmosphere was elucidated. The indium solubility increases in the calcium silicate-based flux and decreases in the calcium aluminate-based flux with increasing oxygen partial pressure. Also, the solubility was found to decrease initially with increasing slag basicity until the basicity reached a critical level after which the solubility increases. This behavior is believed to indicate that the indium dissolution mechanism changes according to the basicity of the slag.
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