prebaked carbon anode supplier in China

Jan 28, 2023

The prebaked carbon anode plays a very important role in the production process of aluminum electrolysis cell. It acts as a conductor to introduce direct current into the electrolysis cell, and participates in the anode reaction process as the anode material of the electrolysis cell. Its quality and working conditions have an impact on whether the aluminum electrolysis production is normal and current Economic and technical indicators such as efficiency, power consumption, and primary aluminum grade are closely related, especially the resistivity indicator, which is an important indicator of the quality of the anode.



The prebaked carbon anode carbon block is generally a rectangular parallelepiped, and the current density through it when the electrolytic cell is energized is generally 0.7A/cm2～0.8A/cm2, plus the lead and contact resistance, the voltage drop on the carbon anode consumed by the aluminum electrolysis production is 300mV～500mV, accounting for 10%～15% of the voltage drop of the electrolytic cell. In the electrolytic cell, the increase in the resistivity of the prebaked carbon anode leads to an increase in the anode voltage drop, and the electrolysis consumption also increases. Each increase in the resistivity of the carbon block by 1μΩ·m will increase the cell voltage by 2.59mV, and every increase in 1mV Pressure drop can increase power consumption by 3.2Kwh/t-Al.

In the actual production process of prebaked anodes, due to the long production process, each process has many influencing factors, and the resistivity often fluctuates relatively greatly, which causes unstable factors to the anode quality, which in turn affects its efficient and energy-saving use in the electrolytic cell. In the non-ferrous metal industry standard for prebaked carbon anodes for aluminum electrolysis (YS/T285-2012), the resistivity of prebaked carbon anodes is not more than 57μΩ·m for the first-class product, and not more than 62μΩ·m for the second-class product.

The change in resistivity of the prebaked anode is a function of the change in heat treatment temperature. In the production process, the structure, porosity, particle size distribution, powder coke content of raw petroleum coke; the control of the calcination temperature of the process conditions, the calcination temperature rise rate, the final calcination temperature, and the holding time; the best combination of material size, equipment adjustment, and parameters Settings and staff operating standards will have a greater impact on the anode resistivity. Most of the existing technologies focus on this and further research, or change the formula or optimize the process conditions in order to obtain high-quality anodes, but the existing The prebaked carbon anode prepared by the technology still has a relatively high resistivity.