2022-11-23
2023-08-15The graphite electrode used in DC arc furnaces has no skin effect when current passes through, and the current is evenly distributed on the current cross-section. Compared with AC arc furnaces, the current density passing through the electrode can be appropriately increased. For ultra high power electric furnaces with the same input power, DC electric arc furnaces only use one electrode, with a larger electrode diameter. For example, a 100t AC electric arc furnace uses electrodes with a diameter of 600mm, while a 100t DC electric arc furnace uses electrodes with a diameter of 700mm. Larger DC electric arc furnaces even require electrodes with a diameter of 750-800mm, and the current load is also increasing. Therefore, the following requirements are put forward for the quality of graphite electrodes:(1) The resistivity of the electrode body and joints should be smaller, such as the resistivity of the electrode body dropping to 5 μ Around Ω. m, the resistivity of the joint decreases to
2023-08-14(1) Processing of graphite electrodes. The processing of electrodes can be divided into three processes: boring and rough flat end faces, turning outer circles and fine flat end faces, and milling threads.(2) Processing of conical joints. The processing of conical joints can be divided into six processes: cutting, flat end face, turning conical surface, milling thread, drilling and installing bolts, and slotting.(3) Processing of cylindrical joints. The cylindrical joint can be divided into three processes: cutting, flat end face, and thread milling.(4) Processing of carbon blocks. The processing of carbon blocks mainly involves flat six surfaces.(5) Processing of special-shaped carbon materials. According to user needs, perform cutting, turning, grinding, boring, slotting, and planing. For products with special requirements, more precise processing is required after normal processing.
2023-08-14(1) Raw materials for the production of artificial graphite electrodes. All low ash raw materials such as petroleum coke and asphalt coke can be used to produce high-quality graphite electrodes. Adding asphalt coke is to improve the strength of the product. The production of ordinary power graphite electrodes can use ordinary quality petroleum coke as raw material; Produce high-power graphite electrodes using high-quality petroleum coke and some needle coke; To produce ultra-high power graphite electrodes, high-quality needle coke must be used as the raw material. To produce high-purity graphite electrodes, petroleum coke with very low ash content is required. In order to improve the lubricity and plasticity of the paste and improve the conductivity of the product, a portion of graphite chips is also added to the production ingredient of graphite electrodes.(2) Raw materials for the production of natural graphite electrodes. Using selected natural graphite as raw material and coal tar
2023-08-14Various metallurgical furnace carbon blocks (such as blast furnace carbon blocks, ferroalloy furnace carbon blocks, calcium carbide furnace carbon blocks, and aluminum electrolysis cell cathode carbon blocks, etc.) are used at a certain high temperature. Therefore, carbon blocks should have high mechanical strength, thermal stability, and corrosion resistance, but the ash content requirements are not too strict. Except for the bottom carbon blocks used in aluminum electrolysis cells, it is not necessary to measure conductivity. The production of carbon blocks mostly uses anthracite as the aggregate and metallurgical coke as the filling material. To improve the thermal conductivity and corrosion resistance of carbon blocks, a certain amount of graphite fragments (or natural graphite) can be added. In order to improve the thermal conductivity and conductivity of carbon blocks, semi graphite carbon blocks can be produced by electrocalcining anthracite.The raw materials used for conductiv
2023-08-10(1) Raw materials. The raw materials used in the production of electrochar products include carbon and graphite powder, metal powder, and binder.(2) Calcination. The calcination of petroleum coke used in the production of electric carbon products generally adopts electric calcination.(3) Ingredients. According to the performance requirements of electric carbon products, 4-5 solid powders are used as ingredients.(4) Material mixing. Mixing mainly uses dry mixer, dual axis stirring knife mixer, pressure mixer, and continuous mixer.(5) Rolling sheet. The paste prepared with coal tar pitch as the binder needs to be processed by rolling to ensure the uniformity of the mixing of various materials.(6) Grinding powder. Grind the kneaded material and rolled sheet material to obtain pressed powder.(7) Pressing. The forming of electric carbon product blanks is generally done by molding, and the forming equipment includes hydraulic presses and mechanical presses.(8) Heat treatment. Heat treatment
2023-08-10On July 22nd, a South Korean research team published a paper on the preprint website arXiv, claiming to have synthesized the world's first room temperature and atmospheric pressure superconductor, named LK-99.Superconductivity refers to superconductivity. Under normal temperature and pressure, almost all conductors have resistance, resulting in thermal energy loss during current conduction. Superconductors are materials that can conduct current with zero loss due to the disappearance of resistance, and have complete diamagnetism (internal magnetic induction strength is zero), with advantages such as stability, low loss, and fast transmission.Previously, superconducting materials needed to enter the superconducting state at lower temperatures. The keyword "room temperature superconductivity" mentioned by the Korean team in this paper refers to the phenomenon of superconductivity achieved under room temperature conditions. According to the standards of condensed matter physics
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