how to make graphite electrodes
How to make graphite electrodes
What harm does graphite electrode have to the body? Let the graphite electrode supplier tell you! Graphite is a crystal structure, and the atomic crystals between molecules and between metal crystals are hexagonal transitions of natural crystals or rhombohedral crystals of mineral elements. Graphite rods are often used as electric heating elements in high-temperature vacuum furnaces. The maximum operating temperature can reach 3000°C. It is easy to oxidize at high temperatures. Except for vacuum, it can only be used in neutral or reducing atmospheres. Its thermal expansion coefficient is small, thermal conductivity is large, resistivity is (8~13)×10-6 Ω·m, processability is better than SiC, MoSi2 rod, high temperature resistance, extreme cold and extreme heat resistance, good price Cheaper.
Graphite electrodes are mainly made of petroleum coke and needle coke as raw materials, coal tar pitch as a binder, and are made through calcination, batching, kneading, pressing, roasting, graphitization, and machining. It releases electric energy in the form of an electric arc in an electric arc furnace. The conductors that heat and melt the charge can be classified into ordinary power, high power and ultra-high power according to their quality indicators. Graphite electrodes mainly include four types of ordinary power graphite electrodes, anti-oxidation coating graphite electrodes, high-power graphite electrodes and ultra-high-power graphite electrodes. Graphite block is a kind of artificial graphite, and artificial graphite is made by artificial heating of coke products. Generally, if it is purified to make high-purity or carbon fiber, the added value is high.
The diamond and the Chinese-American mineralogist named Zhao Jingde made the stones uniform and more similar. A covalent bond is formed in a crystal with sp2 hybridized carbon atoms between layers, and each carbon atom is connected to the other three carbon atoms to form a regular hexagon with six carbon atoms in the same ring plane. The stretched sheet, To form a layered structure. Each carbon atom in the same plane leaves further p orbitals that overlap each other so that the electrons that form delocalized π bonds can move freely in the crystal lattice, which can be excited, so that the graphite has a metallic luster and conducts heat. transfer. Due to the large distance between the layers, the bonding force (van der Waals force) is small. When these layers can slide, the density of graphite is less soft and slippery than diamond.
Graphite is mainly composed of carbon, and there is no harm in general companies, but the nature of graphite is loose, so we are easy to be inhaled. If it exists, we wear masks. If there are too many students: it is harmful. Of course, the graphite factory is harmful to the surrounding environment and residents’ lives during the production process. The dust in the production management workshop is of course harmful to the human lungs. The body of the relevant personnel engaged in the research of graphite quality inspection has been developed for a long time. Of course it will be harmed by graphite! It is easier to get pneumoconiosis. The pathological changes are mainly that the two lungs are obviously black. The entire human lung has isolated or clusters of small black nodules around the bronchioles and small vascular system. Irregular; nodule patients are surrounded by focal emphysema, thickened pleura adhesions. X-ray chest X-ray examination is mainly manifested by increased lung texture information, accompanied by fine mesh and fine nodules forming shadows, and the development of the disease has increased coarse mesh , Often combined with severe emphysema, Chinese companies have listed carbon black pneumoconiosis as a national occupational disease management scope. Graphite electrode supplier.