A kind of carbon block fixing method and device for continuous prebaked anode

Abstract

The invention discloses a carbon block fixing method used for a continuous prebaked anode. The carbon block fixing method is characterized in that a new anode carbon block (4) is arranged on an anode carbon block (4) which is in electrolysis, and the part between the upper anode carbon block (4) and the lower anode carbon block (4) is coated with a bonding layer (5); and through heat conduction of the lower anode carbon block (4) in the electrolytic process, the anode carbon blocks (4) are sintered together. By means of the carbon block fixing method used for the continuous prebaked anode, the new anode carbon block is arranged on the anode carbon block which is in electrolysis, coating of the bonding layer is conducted, and the upper anode carbon block and the lower anode carbon block are sintered together through electrolysis heat transfer.

Description

technical field [0001] The invention relates to a carbon block fixing method and device used in the field of electrolytic aluminum production, in particular to a carbon block fixing method and device for continuous prebaked anodes. Background technique [0002] In the modern electrolytic aluminum industry, prebaked anodes are generally used to produce electrolytic aluminum. There are 2 to 4 circular grooves with a diameter of 160 to 180 mm and a depth of 80 to 110 mm on the upper surface of the anode carbon block, commonly known as carbon bowls. The anode claw head is cast in the carbon bowl, and the anode claw head and the aluminum conductive rod are connected by aluminum-steel explosion welding, and then the aluminum conductive rod is closely connected with the anode carbon block to form the anode carbon block group. In the production process of electrolytic aluminum, the anode carbon block will be continuously consumed due to its continuous reaction with the oxygen decom...

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Problems solved by technology

At present, the production process mainly has the following disadvantages: 1) the replacement of a new anode carbon block is in a normal temperature state, and it must be placed in the electrolytic cell to be preheated for about 24 hours before it can conduct electricity, so replacing the anode carbon block will increase heat loss, and When the pole is changed, it will have a great impact on the stability of the electrolytic cell; 2) The replacement of the anode will have a periodic impact on the production of aluminum electrolysis, destroying the energy and material balance of the electrolytic cell, affecting the current efficiency and increasing the power consumption rate; 3) In order to separate the anode claw from the anode butt, it is necessary to break the charcoal bowl where the phosphorus pig iron is cast, so that the anode butt falls off from the anode claw to achieve separation. This process is not only time-consuming, but also labor-intensive and inefficient. ;4) The amount of anode butts produced under replacement is generally 10% to 15% of the output of aluminum ingots. According to the calculation of China's aluminum ingot output of 26 million to 27 million tons per year, the annual output of anode butts is 2.6 million to 3.9 million Ton / year, according to the calculation of anode carbon block 2700 yuan / ton, China will waste tens of billions of anode carbon blocks each year; Adsorb a large amount of electrolyte, the main component of electrolyte is fluoride salt, the anode residue that contains a large amount of fluoride salt is very serious to environmental pollution; Waste, the anode remnant must be burned as thin as possible. At the end of the life of the anode carbon block, the top surface of the anode carbon block is very close to the electrolyte level. Affected by the magnetic field and air flow, strong waves are constantly generated on the surface of the electrolyte. In the actual production process, The anode claws are often corroded by the electrolyte. The iron element of the anode claws dissolves into the electrolyte and then enters the aluminum ingot, affecting the quality of the finished product. The service life of the anode claws is generally about 3 years, which also increases the production cost accordingly. At the end of the life of the carbon block, the thickness of the anode butt that is too thin will inevitably lead to uneven conduction of the carbon electrode, which will lead to fluctuations in the working conditions of the electrolytic cell and increase power consumption

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