Production process of pre baked anode

The pre-baked anode is made from petroleum coke and asphalt coke as the base materials and coal asphalt as the binder. It is used as the anode material for pre-baked aluminum electrolytic cells. These carbon blocks have been baked and have a stable geometric shape, so they are also called pre-baked anode carbon blocks. Traditionally, they are also called carbon anodes for aluminum electrolysis. The aluminum electrolytic cells using pre-baked anode carbon blocks as the anode are called pre-baked anode electrolytic cells, or simply pre-baked cells. This is a modern large-scale aluminum electrolytic cell.

The pre-activated carbon anode is usually installed at the upper part of the electrolytic cell. A strong direct current of 60-300 ka passes through the carbon anode and is introduced into the electrolyte. The resistivity of the carbon anode is 50-70 μΩ.m. In addition to the resistance of the connecting rods and contacts, during normal aluminum electrolysis production, the voltage drop on the consumed carbon anode is 300-500 mV, accounting for 10% - 15% of the voltage drop of the electrolytic cell. At the part where the carbon anode contacts the molten electrolyte at the bottom, a complex electrochemical reaction (anode reaction) occurs for the decomposition of alumina. With the participation of carbon, the final products of the anode are CO and CO2. In aluminum electrolysis production, the average daily consumption of the carbon anode is 1-2 cm. Regularly adding new anode paste to the upper part of the electrolytic cell (for self-baked anode electrolytic cells) or regularly replacing the pre-activated anode (for pre-activated anode electrolytic cells) is the main content of the anode operation to maintain the continuous and normal operation of the anode.