Magnesium-aluminum and its alloys are widely used in production and life, such as raw materials for aerospace equipment, for the production of batteries, etc. Magnesium and aluminum are generally obtained through: seawater→magnesium hydroxide→magnesium chloride→magnesium; bauxite Ore→sodium metaaluminate→aluminum hydroxide→alumina→aluminum. Magnesium can also be obtained by reducing with carbon or calcium carbide as reducing agent