Graphite electrode refers to petroleum coke, asphalt coke as aggregate, coal tar pitch as binder, through raw material calcination, crushing milling, compounding, kneading, molding, roasting, impregnation, graphitization and mechanical processing. High-temperature graphite conductive material, called artificial graphite electrode (abbreviated as graphite electrode), is distinguished from natural graphite electrode prepared by using natural graphite as raw material.
The graphite electrode is a conductor that heats and melts the charge in the form of an electric arc in an electric arc furnace. According to its quality index, it can be divided into a common power graphite electrode, a high power graphite electrode and an ultra high power graphite electrode.
The main raw material for graphite electrode production is petroleum coke. The ordinary power graphite electrode can be added with a small amount of pitch coke. The sulfur content of petroleum coke and pitch coke cannot exceed 0.5%. Needle coke is also required for the production of high power or ultra high power graphite electrodes. The main raw material for aluminum anode production is petroleum coke, and the control sulfur content is not more than 1.5% to 2%. Petroleum coke and pitch coke should meet the relevant national quality standards.
Graphite electrodes are easier to process and process faster than copper electrodes. For example, the use of milling technology to process graphite, its processing speed is 2 to 3 times faster than other metal processing and does not require additional manual processing, while copper electrodes need to be frustrated by human hands. Similarly, if a high-speed graphite machining center is used to make the electrode, the speed will be faster, the efficiency will be higher, and no dust problem will occur. In these processes, the choice of tools and graphite with the right hardness reduces the wear loss of the tool and the breakage of the copper electrode. If the milling time of the graphite electrode and the copper electrode is specifically compared, the graphite electrode is 67% faster than the copper electrode. In the general case of electrical discharge machining, the processing using the graphite electrode is 58% faster than the copper electrode. As a result, the processing time is greatly reduced, and the manufacturing cost is also reduced.