Aluminum (Al) is a kind of light metal, and its compounds are widely distributed in nature. The resource of aluminum in the
earth's crust is about 40-50 billion tons, second only to oxygen and silicon, ranking third. Among the metal varieties, it is the first type of metal. Aluminum has special chemical and physical properties. It is not only light in weight, strong in texture, but also has good ductility, electrical conductivity, thermal conductivity, heat resistance and nuclear radiation resistance. It is an
important basic raw material for the development of the national economy.
