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Preliminary Study of the Electrolysis of Aluminum Sulfide in Molten Salts
A preliminary laboratory-scale study of the electrolysis of aluminum sulfide in molten salts investigated the (1) solubility of Al2S3 in molten salts, (2) electrochemical behavior of Al2S3, and (3) electrolysis of Al2S3 with the determination of current efficiency as a function of current density. The solubility measurements show that MgCl2-NaCl-KCl eutectic electrolyte at 1023 K can dissolve up to 3.3 mol % sulfide. The molar ratio of sulfur to aluminum in the eutectic is about one, which suggests that some sulfur remains undissolved, probably in the form of MgS. The experimental data and thermodynamic calculations suggest that Al2S3 dissolves in the eutectic to form AlS species in solution...
Production of Aluminum Metal by Electrolysis of Aluminum Sulfide
Production of metallic aluminum by the electrolysis of Al.sub. 2 S.sub. 3 at 700.degree.-800.degree. C. in a chloride melt composed of one or more alkali metal chlorides, and one or more alkaline earth metal chlorides and/or aluminum chloride to provide improved operating characteristics of the process.
