The chemical symbol is Sb, with an atomic number of 51, and it is a silver gray metallic element. The content in the Earth's crust is relatively low, mainly existing in sulfide minerals such as antimonite and antimonite. The physical properties are relatively unique, brittle at room temperature, but become soft and easy to process after heating. Low melting point, low conductivity and thermal expansion make it suitable for specific industrial applications. The main applications include manufacturing alloys, such as antimony lead alloys, to enhance the hardness and corrosion resistance of metals. Antimony as an additive can improve the performance of batteries, especially lead-acid batteries. In addition, it is also used in the production of flame retardants.