also be used as an even cheaper alternative for silicon and ferrosilicon, but is disadvantageous because it decreases the magnesium yield slightly.

The magnesium raw material of this type of reaction is magnesium oxide, which is obtained in many ways. In all cases, the raw materials must be calcined to remove both water and carbon dioxide. Magnesium oxide can also be obtained from sea or lake water magnesium chloride hydrolyzed to hydroxide. The Mg(OH)₂ is thermally dehydrated. Another