china shp graphite electrode
What are the consumption mechanisms of china shp graphite electrode in electric furnace steelmaking?
The consumption mechanism of china shp graphite electrode in electric furnace steelmaking<p></p> China shp graphite electrode is mainly used as the conductive material of electric arc steelmaking furnace, so the performance of china shp graphite electrode is mainly based on china shp during steelmaking. The consumption of graphite electrode, the consumption of china shp graphite electrode per ton of electric furnace steel is firstly related to the quality of the electrode itself, but also to the steelmaking equipment and smelting process (such as the current density through the electrode during smelting, the type of smelting steel, the quality of scrap steel” The duration of oxygen blowing has a lot to do with whether the china shp graphite electrode is used to increase carbon, etc. The consumption of china shp graphite electrode in electric furnace steelmaking can be broken down into four parts.
1. Electrode end consumption? The electrode end consumption includes the sublimation caused by the high temperature of the arc and the loss of the chemical reaction of the electrode end with molten steel and slag. The high temperature sublimation rate (kg/h) of the electrode end mainly depends on the current density through the electrode , Secondly, it is related to the diameter of the electrode end (forming a cone) after oxidation. During the process of electric furnace steelmaking, in the stage of melting or forming foamed slag, partially molten slag splashes onto the surface of the electrode. This oxygen-enriched slag reacts quickly with the electrode, and the electrode, molten steel and slag occur at a certain temperature. The chemical reaction is as follows: +3C&;→2Fe＋3CO 3Fe+C&;&3C CaO+3C–&2+CO The consumption of the electrode end is also related to whether the electrode is inserted into the molten steel to increase carbon.
2. The chlorination loss on the outer surface of the electrode? The chemical composition of china shp graphite electrode is mainly carbon. Under certain conditions, carbon will oxidize with air, water vapor, and carbon dioxide. The reaction rate depends on the temperature and atmosphere in the furnace at that time. It depends on the nature. ? The oxidation loss on the outer surface of the electrode is the product of the unit oxidation rate (kg/(m²&;h)) and the exposed area. In recent years, in order to increase the smelting speed of the electric furnace, the oxygen blowing operation has been used, which leads to the increase of the oxidation loss of the electrode. In general, the oxidation loss on the outer surface of the electrode accounts for about half of the total consumption. Figure 2-7 is a schematic diagram of the electrode oxidation consumption. During the smelting process, the electrode is gradually oxidized into a cone. Assume that the diameter of the electrode is D when it is not oxidized. , The diameter of the lower end of the electrode after oxidation is d, and the oxidation loss on the outer surface of the electrode is obviously proportional to the size of d/D. The smaller the d/D, the faster the oxidation of the outer surface of the electrode; the larger the d/D, the more The round surface oxidizes slowly. In the steelmaking process, the taper of the electrode is often observed as an intuitive way to measure the electrode’s oxidation resistance.
3. Loss of the residual body of the electrode or joint? A small section of the electrode or joint (ie residual body) where the electrode is used continuously to the connection of the upper and lower electrodes is easy to fall and increase consumption. This residual loss is related to the shape of the joint. Cone-shaped joints almost inevitably have residual loss, and conical joints basically do not produce residual loss. Other reasons for residual loss are cracks on the residual body or the residual body falling due to vibration or impact.
Fourth, the loss of electrode fracture, surface peeling and falling blocks? This part of the loss is collectively referred to as mechanical loss (different from the above-mentioned chemical reaction loss mainly due to oxidation). Electric furnace steel plants generally will inevitably be oxidized and sublimated at high temperature? Electrode consumption is called "net consumption", "net consumption" plus mechanical losses such as breakage and residual body losses are called "gross consumption". The main contents and causes of mechanical losses are shown in Table 2&;8 Shown. Integrating the above four consumption factors of china shp graphite electrode on the electric furnace, for high-quality china shp graphite electrode, and the electric furnace is carefully operated, the amount of china shp graphite electrode consumed per ton of electric furnace steel consumes about It accounts for 30% to 60%, the external surface consumption accounts for about 30% to 60%, the residual loss accounts for about 4% to 10%, and the mechanical loss accounts for about 1% to 15%.