Abstract
The solubility and dispersion of Mg in the systems MgCl 2, MgCl 2-NaCl and MgCl 2-KCl has been studied. An extensive study of Mg solubility in MgCl 2 did not show any influence on the content of MgO or added NaOH or Na 2B 4O 7. At 750°C the solubility was found to be 0.16 mol%. The solubility increased with increasing temperature and decreased on the addition of NaCl or KCl. In 25 mol% NaCl-75 mol% MgCl 2 the solubility was as low as 0.02 mol% at 815°C. The amount of Mg dispersed was found to be negligible with the present experimental set-up. The results are discussed with reference to the back reaction between Mg and Cl 2 in the industrial electrolysis. It seems likely that the rate determining step in this reaction is the rate of formation of small metal particles in the melt.
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