Modern electrolytic aluminum industry adopts cryolite-alumina molten salt electrolysis method, in which carbon is used as anode and aluminum liquid is used as cathode, and after strong direct current is introduced, electrochemical reaction is carried out at 950℃-970℃ in the electrolytic cell, that is, electrolysis.
Knowledge expansion:
Aluminum is a light, beautiful and corrosion-resistant metal, which is widely used in construction, transportation, electronics, packaging and other fields.
Aluminum is a silvery white metal, which belongs to non-ferrous metal and is one of the most abundant metal elements in the earth's crust. The specific gravity of aluminum is relatively light, about 2.7, and its melting point is relatively low, about 660℃. Aluminum has good plasticity and ductility, and can be processed into various shapes, such as plates, foils, tubes and rods. At the same time, aluminum also has good corrosion resistance and weather resistance, and is not easy to rust and oxidize.
Aluminum is widely used in the construction field. For example, aluminum alloy doors and windows are light, beautiful and durable, and are widely used in various buildings. In addition, aluminum plate is also a common material for building exterior walls and roofs, because it has good corrosion resistance and aesthetics. In addition, aluminum alloy bridge is also an important structural form in modern architecture, which has the characteristics of light weight, high strength and corrosion resistance.
The transportation field is also one of the important application fields of aluminum. For example, automobile body and frame are usually made of aluminum alloy, because aluminum alloy has the characteristics of light weight, high strength and corrosion resistance. In addition, airplanes and high-speed trains also use aluminum alloys as structural materials.
Electronic field is also one of the important application fields of aluminum. For example, aluminum is one of the main materials for manufacturing electronic circuit boards because of its good electrical conductivity and machinability. In addition, aluminum can also be used to make various electronic components and batteries.
Packaging field is also one of the important application fields of aluminum. For example, aluminum foil can be used to package all kinds of foods and medicines, because it has good moisture-proof, mildew-proof and moth-proof characteristics.
In a word, aluminum is a widely used metal material, which has the characteristics of light weight, beautiful appearance and corrosion resistance, and is widely used in construction, transportation, electronics, packaging and other fields. With the continuous development of science and technology, the application field of aluminum will also expand, bringing more convenience and benefits to human production and life.