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1. The anode bottom palm of the anode long package is poorly consumed for some reason, and a bag-shaped or cone-shaped protrusion is formed on the bottom palm, which is called the anode long package. The reason for the long anode package is very complicated. When the protruding package at the bottom of the anode enters the molten aluminum, the current forms a short circuit, causing empty current consumption and greatly reducing the current efficiency. When a cold tank or hot tank appears in the electrolyzer, the material balance is destroyed, which will cause the anode to be long-packed. However, the stroke is different, the position of the anode long-pack is different, and the condition of the electrolytic cell after the long-pack is different. When a cold bath occurs, the legs are long and the anode end is easy to contact the edge of the legs. The package is long at the end of the anode near the large surface, and the electrolytic cell does not appear to be too hot after the package is long. When a hot bath occurs, due to the carbon slag blocks attached to the anode bottom palm, which hinders consumption, most of the packages grow in the middle of the anode bottom palm. After the package is long, the bath temperature is very high, and white smoke often comes out of the anode when the package is long. The anode long package caused by the destruction of the material balance is similar to that of the hot tank. The common feature of the anode long package is that the electrolytic cell does not have any effect, and even if it does, the effect voltage is very low and the voltage is unstable. There will be an obvious voltage swing in the electrolytic cell at the beginning of the long package. Once the package enters the aluminum liquid, the cell voltage becomes stable, the precipitation at the bottom of the furnace increases rapidly, the electrolytic cell gradually reheats, and the anode is unable to work. How to handle the anode long package: 1)． If the long package comes into contact with the aluminum liquid, first lift the anode out of the aluminum liquid, use a large rake to scrape off the outer layer of the protruding part to make the surface conductive, then put it back into the tank and continue to use it with electricity, so that the package will be consumed automatically. 2)． When the package is too big, use an iron drill or steel drill to break it off. If it cannot be removed, use a thick residual electrode to replace it. After treatment, the anode current distribution should be measured in time, the height of the anode should be adjusted to make the current distribution uniform, and the cryolite-aluminum fluoride mixture should be used to cover the anode. This prevents incomplete treatment from causing long loops and turning them into other forms of disease. 2. The anode falls off the prebaked tank. Due to anode quality or operation quality problems, individual anodes fall off or fall off (partially fall off). In severe cases, multiple groups of anodes (more than three groups) may fall off in a tank in a short period of time (within a few hours), causing great damage to the operation of the electrolytic cell, and even forcing the cell to shut down. The main cause of multiple sets of anodes falling off is severe bias current caused by uneven distribution of anode current. When a strong current is concentrated on a certain part of the anode, the phosphorus pig iron or aluminum-steel poured at the connection between the carbon block and the steel claw will be melted by explosive welding in a short period of time. The anode will separate from the steel claw or aluminum guide rod and fall into the groove. Then the current will flow to other anodes, causing vicious current transfer. The main reasons for anode bias current are as follows: 1). The liquid electrolyte is too low (below 150mm), the immersion of the anode is too shallow, and the bottom palm of the anode is slightly uneven, causing the anode current to be unevenly distributed, localized, and biased; 2). There is a lot of precipitation at the bottom of the furnace, with different thicknesses, and the cathode current is concentrated, causing the anode current to be concentrated and forming a bias current. 3)． When lifting the busbar, the anode clamps are not tightened inconsistently, or the anodes slide down. Failure to adjust them in time will also cause anode current bias, eventually causing multiple sets of anodes to fall off. The principles for dealing with multiple sets of anode shedding are: 1). First measure the anode current distribution, adjust the anode that has not fallen off, make it conduct electricity as uniformly as possible, and control the occurrence of continued shedding 2). Remove the fallen pieces as soon as possible and install the remaining anode to conduct electricity again. Do not install a new anode. 3)． During the treatment process, if the electrolyte dries up and sinks to the bottom of the furnace, aluminum water floats, and the voltage automatically drops, the falling pieces must be dealt with in time, and then the electrolyte must be extracted from other tanks and poured into it. The voltage must be raised while filling, and the voltage must not be raised forcefully. Then the anode current distribution is measured, and the pole distance of each group is adjusted to make the current distribution uniform and the anode is in working condition. This post was last edited by yutr on 2009-3-15 09:58 ]