Effect of KCl on Liquidus of LiF-MgF2 Molten Salts

Liquidus temperature of KCl-LiF-MgF₂ molten salts was determined based on cooling curve. The method of cooling curve was reliable and accurate. Experimental accuracy has been measured by the determined liquidus temperature of KCl. The measured value of KCl liquidus temperature of 769.27 ° C is near and comparable to the documented value 769.5 ° C. The difference value is 0.23 ° C, and the relative error was 0.03%. The results show that effect of KCl on liquidus of molten salt MgF₂-LiF electrolyte was great. The liquidus temperatures lowered with increasing of content of KCl in electrolyte. The liquidus temperature could be reduced 20 ° C with content of KCl in electrolyte increased to 50wt%. The experiments showed that the compound addition of KCl into LiF-MgF₂ electrolyte not only reduced the liquidus temperature of electrolyte effectively, but also decreased the aluminum-magnesium production cost and increased the economic benefits.