Liquidus Curves for Aluminum Cell Electrolyte

Abstract

Liquidus curves have been determined by means of cooling curves and visual examination of the cooling melt. The binary systems of cryolite with aluminum fluoride and calcium fluoride gave, respectively: peritectic point at 30% aluminum fluoride and 739 °C, eutectic point at 40% aluminum fluoride and 694°C; eutectic point at 26% calcium fluoride and 945°C. In the system cryolite‐alumina‐calcium fluoride the ternary eutectic point was at 2.9% alumina, 21% calcium fluoride and 933°C. (Compositions are in weight per cent). Diagrams are given for the cryolite‐rich part of the systems cryolite‐calcium fluoride, cryolite‐alumina‐aluminum fluoride, cryolite‐alumina‐calcium fluoride, and cryolite‐alumina‐aluminum fluoride‐calcium fluoride.