ALUMINA SOLUBILITY IN KF-AlF_3-BASED LOW-TEMPERATURE ELECTROLYTE SYSTEM

摘要

The solubility of alumina in a molten KF-AlF_3-based low-temperature electrolyte was determined as a function of the melt composition and temperature by measuring the weight loss of a rotating, sintered alumina disc and by using a LECO oxygen analyzer. The investigated temperature range was 650 to 800 deg C. The solubility of alumina increases with' the mole ratio (CR), n deg KF/n deg AlF3 from 0.9 mol percent (CR=1.0) to 4.1 mol percent Al_2O_3 (CR=1.5) at 700 deg C. The results suggest that a KF-AHVAUV based system can be used as a low-temperature electrolyte in primary aluminum production.