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Potential Safety Hazards of Graphite Electrodes and Graphite Anode Plates under High Temperature Oxidation

Sep. 18, 2020

Industry requires graphite electrodes and graphite anode plates to use three types of equipment or materials, and their use is directly related to the safety and efficiency of industrial production. If the material is oxidized and corroded, the normal operation of industrial production will not be realized, and the safety risk index will be greatly improved.

When the graphite electrode is working normally, its temperature can reach 1400℃. At high temperatures, the graphite electrode lining is oxidized and aged at high temperature in high-temperature flame grilling, lining thermal insulation bricks, thermal insulation cotton, and other thermal insulation materials, the materials are brittle, the thermal insulation effect is reduced, and the safety indicators of graphite electrodes drop sharply. In this way, a batch of graphite electrode linings will be replaced, which will lead to material waste and shorten the normal working time of graphite electrodes.

Graphite Electrode

The oxidation corrosion of the graphite anode plate is faster in a high-temperature environment. High-temperature oxidation of graphite anode plate refers to the reaction of graphite anode plate with oxygen or oxygen-containing substances such as steam, CO2, SO2, etc. under high-temperature gas environment to become graphite anode plate oxide. The oxide of the graphite anode plate is separated from the graphite anode plate and cannot be formed as a whole. High-temperature corrosion is a common problem in petrochemical, energy, electric power, metallurgy, aerospace, and other fields. Corrosion and oxidation of graphite anode plates at high temperatures will lead to the reduction of the brittle layer, hardness, strength, toughness, and other indicators of graphite anode plates, which can easily lead to major safety accidents such as explosions. High-temperature graphite includes graphite electrodes, graphite molds, and graphite crucibles. The graphite in these three materials is prone to oxidation and combustion reactions at high temperatures, which leads to the increase of the porosity and loose structure of the rubber-carbon layer on the surface of the material, which affects its service life. Taking the traditional ladle baking as an example, after baking, a decarburized loose layer of more than 15 mm is produced on the general surface of the carbon-containing (graphite) refractory, and the decarburized layer is quickly corroded after the steel is lifted. Graphite is a relatively valuable material. Corrosion and oxidation will lead to increased production costs and waste of energy materials. The hazards caused by high-temperature oxidation of graphite anode plates and the significant safety significance and energy-saving benefits of preventing oxidation are reviewed. It is very important to effectively prevent the oxidation rate at high temperature, improve the energy-saving utilization rate of materials, and reduce the safety accident rate of industrial high-temperature production materials.

The above information is provided by the graphite electrode supplier.


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