MgCl2 which typically consists of 85% MgCl2, 5% H2O, 5% MgO, 5% KCl+NaCl. Evaporation of hydrated MgCl2 in an HCI atmosphere will also produce anhydrous MgCl2. Figure 3 illustrates a modern cell utilizing anhydrous MgCl2 feed. The cell is lined with refractory materials. The steel cathodes and graphite anodes are fixed in place and supported by the cell cover. A ceramic semiwall aids in keeping the chlorine and magnesium metal from mixing as they rise to the top of the cell. The electrolyte composition is 12% MgCl2, 40% CaCl2, 40% NaCl, and 8% KC1 and the operating temperature is about 750 °C (1380 °F). The current efficiency is 75% to 85%
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