Three kinds of equipment or materials are required for graphite electrode and graphite anode plate in industry. 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 index of potential safety hazard will be greatly improved.
When the graphite electrode works normally, its temperature can reach 1400 ℃. At high temperature, the graphite electrode lining is oxidized and aged at high temperature, such as high-temperature flame barbecue, lining insulation brick, thermal insulation cotton and other insulation materials, the material is brittle, the thermal insulation effect is reduced, and the safety index of graphite electrode drops sharply. In this way, a batch of graphite electrode lining will be replaced for 3-5 years, which will lead to material waste and shorten the normal working time of graphite electrode. For businesses, it’s a loss for the wife and the army.
The oxidation corrosion of graphite anode plate is faster in 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 and SO2 to form graphite anode plate oxide under high-temperature gas environment. The oxide of graphite anode plate is separated from graphite anode plate and cannot form a whole. High temperature corrosion is a common problem in petrochemical, energy, power, metallurgy, aerospace and other fields. The corrosion and oxidation of graphite anode plate at high temperature will lead to the reduction of brittle layer, hardness, strength, toughness and other indicators of graphite anode plate, which will easily lead to explosion and other major safety accidents.
High temperature graphite includes graphite electrode, graphite mould and graphite crucible. The graphite in these three materials is prone to oxidation combustion reaction at high temperature, which leads to the increase of porosity and loose structure of rubber carbon layer on the surface of materials, and affects its service life. Taking the traditional ladle baking as an example, the decarburized loose layer of more than 15 mm is produced on the general surface of carbon containing (graphite) refractory after baking, and the decarburized layer will be corroded quickly after steel lifting. Graphite is a relatively valuable material. Corrosion and oxidation will lead to the increase of production costs and the waste of energy materials.