Prebaked anode electrolytic cells all adopt a large-surface power feeding method.
The prebaked carbon anode is usually installed on the upper part of the electrolytic cell. A powerful DC current of 60-300ka passes through the carbon anode and introduces the electrolyte. The resistivity of the carbon anode is 50-70 μΩ.m, plus the resistance of the guide rod and the contact point. During normal aluminum electrolytic production, the voltage drop on the consumed carbon anode is 300-500mV, accounting for 10%-15 of the voltage drop of the electrolytic cell. %.
A complex electrochemical reaction (anodic reaction) that decomposes aluminum oxide occurs at the bottom of the carbon anode where it contacts the molten electrolyte. With the participation of carbon, the final products of the anode are CO and CO2.
In aluminum electrolysis production, the average daily consumption of carbon anodes is 1-2CM. New anode paste is regularly added to the upper part of the electrolytic cell (for self-baking anode electrolytic cells) or the prebaked anode is regularly replaced (for prebaked anode electrolytic cells). Anode electrolyzer) is the main part of the anode work to keep the anode working continuously and normally.
In recent years, my country's electrolyzers have undergone a series of transformations and upgrades. The main advanced technologies and processes adopted are:
(1) Intermediate point blanking technology.
(2) Computer intelligent fuzzy control technology.
(3) Dry flue gas purification technology.
(4) Alumina super-dense phase transportation technology.
(5) "Four lows and one high" advanced process technology conditions (low temperature, low molecular ratio, low effect coefficient, low Al2O3 concentration, high polar distance).
(6) Computer simulation and “three-field” optimization implementation technology.
(7) Cathode optimization technology: including the use of semi-graphite or high graphite carbon blocks on the upper part of the cathode, the use of dry anti-seepage material on the bottom, the use of heterosexual carbon blocks on the sides, and the use of cradle-type tank shells on the outside. .
(8) Adopt a new "four-corner or multi-point hanging" anode lifting device.
(9) Ensure the anode frame operates smoothly.