Molten alkali-metal halides and their mixtures

1 MOLTEN ALKALI-METAL HALIDES AND THEIR MIXTURES 

Delarue reported the qualitative study of metal-oxide solubility in the molten KCl-LiCl eutectic at a temperature near 500 °C [319, 320]. This examination used visual solubility control. To obtain the metal-oxide, a small quantity of KOH was added to a solution of the studied metal chloride in the molten KCl-LiCl. If such an addition did not result in the precipitation of the oxide, then the oxide was referred to as a soluble one  

Equilibria in solid oxide-ionic melt systems 

Sulfides of alkali- and alkaline-earth metals including magnesium, manganese(II) and thallium(III) were found to be soluble in the melt and their solutions were colourless. On the contrary, the addition of Na2S to solutions of other cations caused precipitation of solid sulfides which were black, apart from ZnS (white), CdS (orange) and Ce2S3 (grey). It should be 

The addition of sodium sulfite to solutions of metal chloride in the molten KCl-LiCl eutectic causes chemical interactions whose directions are dependent on the cation acidity and the solubility of the corresponding oxides and sulfides. So, interaction with acidic cations proceeds according to the following equation  

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Molten alkali-metal halides and their mixtures... 

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