Magnesium is mainly used in the manufacture of aluminum alloys. As an alloying element, magnesium can increase the mechanical strength of aluminum, improve machining and alkali corrosion resistance. Due to the high specific strength (strength per unit weight) of structural parts or die-casting parts of magnesium-based alloys (including aluminum, manganese, zinc, lithium, etc.), in the automotive, aviation, aerospace and other industries, magnesium can be used to replace part of aluminum. Reduce the weight of the structure. Due to the strong aggregation of magnesium and halogens, magnesium is an important reducing agent used in the production of titanium, zirconium, hafnium, uranium, beryllium, etc. by metal thermal reduction. Magnesium is used as a nodularizer in the production of ductile iron. Using magnesium instead of calcium carbide for desulfurization in iron and steel smelting can reduce the sulfur content in steel even lower and increase the amount of magnesium used in this area faster. In organic synthesis, a variety of complex organic compounds can be synthesized by using the Grignard reaction of magnesium. Magnesium is also used as an anode material for cathodic protection of chemical storage tanks, underground pipelines and ship hulls. Magnesium is used to manufacture dry batteries, magnesium-seawater reserve batteries. Due to the high heat of combustion, magnesium emits a dazzling flame when it burns. Magnesium is used to make flares, incendiary bombs and fireworks. In addition, magnesium can also be used as a new energy storage material.