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Magnesium: Fused Carnallite Electrolysed in an Iron Pot
Magnesium is made by passing a current through molten chlorides. Thorpe (1912) gives Borchers's process: carnallite and salt dried and fused in an iron pan, cleaned with sawdust and ammonium chloride, then electrolysed in an iron pot that is itself the cathode, with a carbon anode in a porcelain sleeve that leads off the chlorine. The buttons are liquated under fresh carnallite and cast into ingots. Chlorine is poisonous: outdoors, respirator.
The picture: magnesium ingots and coiled sheet (CSIRO, Wikimedia Commons).
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