Cathode Bar

Cathode bars are used in the production of aluminium by electrolysis. In the electrolytic process, alumina is dissolved in a molten cryolite bath and subjected to an electric current. The electric current is carried by the cathode bars, which are typically made of carbon. During the process, the cathode bars are immersed in the molten electrolyte and act as a conductor, allowing the electric current to pass through to the aluminium oxide dissolved in the bath. The electric current causes the aluminium to be deposited on the surface of the cathode bars, which gradually grow in size as the aluminium is deposited.

Over time, the cathode bars can become coated with a layer of aluminium and other impurities, which can reduce their effectiveness in conducting electricity. As a result, the cathode bars must be periodically replaced to maintain the efficiency of the electrolytic process. New cathode bars are typically made of a combination of high-purity carbon and other materials, such as copper , to improve their performance and durability.