The possibility of magnesium addition to a calcium-lead alloy during the Kroll-Betterton process using a molten salt technique is examined. The exchange reaction replacing calcium with magnesium proceeds with efficiencies close to 100% at 750°C in melts containing >40 mol-%MgCl2. In melts with lower MgCl2 contents there is a decrease in efficiency due to the relatively high solubility of calcium metal in CaCl2.
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