Steel is used in almost every industry and is made in Basic Oxygen Fuses (BOFs). This process produces molten steel by burning coke and other carbon containing waste. Another way to make steel is through Electric Arc Furnace Steelmaking (EAF). This is a cleaner method, as it uses electricity instead of scrap steel. It requires graphite electrodes in order to conduct the current that melts the scrap. Graphite has the unique capability to withstand high temperatures while conducting electricity. Consequently, it is an essential component in the steelmaking process of EAF.
Graphite Electrode can be used as a source of energy in electric arc forges (EAFs) to smelt scrap steel and produce new steel. This steel is then used in construction, transportation and other industrial applications. The market of Graphite Electrode for EAF is expected grow rapidly in the coming years as a consequence of rapid infrastructure growth in countries such as China or India.
Graphite electrode is a vital part of BOF steelmaking and EAF steelmaking as both processes require a very high level of electrical resistance, strength and durability. Coidan Graphite manufactures high quality Graphite Electrode to meet these requirements, specifically for the Blast Furnace and the EAF steelmaking process.
In general, Graphite Electrode comes in three different types: UHP HP and RP. The choice of graphite electrode depends on the application, but the general properties of the graphite are similar for all grades: good electrical conductivity, strength and durability. The bulk density of electrodes is a key factor that determines how much material it takes to make an electrode, and how long the electrode will last in industrial applications.
For this experiment, the electrodes are prepared by mixing green and raw petroleum needle-coke with Hexagon’s performance+ additive material in various amounts. The mixture is then thickened using coal tar paste. This paste then went through NAmLab’s proprietary Extruder Mixer to form elongated and uniform diameter rods. The electrodes underwent either multiple calcinations or a single pitch impregnation. The electrodes with the lowest bulk density lost 18-23% of their weight upon graphitization, which indicates that these electrodes had significant open porosity.
The He/N2 Multipycnometer is the preferred tool to measure graphite's true density. The method requires a low electric current to prevent sample heating and the voltage across a specified length of the electrode is measured. The data is used to calculate graphite's resistance to electricity.
This test can be done quickly and is non-destructive. This makes it an ideal tool to test electrodes in advance of their use. The pycnometer provides the data needed to select the best graphite electrodes for the Steelmaking Industry. This data allows for the optimization of the steel manufacturing process. It also helps to save money and reduce energy consumption.
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