Graphite electrode production processing
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1. Raw materials: use of high quality calcined petroleum coke and needle coke2. Calcination: the carbonaceous raw materials are heat-treated at -°C to discharge the contained moisture and volatile matter, and the production of correspondingly improving the raw material properties.3. Crushing, screening, batching: before batching, the large calcined petroleum coke and needle coke should be crushed, ground, and screened, and then aggregates and powders of various sizes should be processed according to the requirements of the formula. Binders are calculated separately, weighed for ingredients.4. Mixing and kneading: At a certain temperature, the quantitative carbonaceous particles and powders of various particle sizes and the quantitative coal pitch are stirred and mixed uniformly, and the process of synthesizing plastic paste is carried out.5. Forming: The process of plastically deforming the mixed carbon paste under the external force of the molding equipment to form a green body with a certain shape, size, density and strength.
6. Baking: It is the process of carbonizing the coal pitch in the green body by performing high temperature heat treatment in a carefully designed heating furnace under the protection of the filler. The calcined carbon products have higher mechanical strength, refractive index resistivity, better thermal stability and chemical stability.
7. Impregnation: Inject carbon material into a pressure vessel, and inject liquid bituminous cement under certain temperature and pressure conditions to reduce the porosity of the product, increase the bulk density and mechanical strength of the product, and improve the electrical and thermal conductivity of the product.8. Secondary baking: the production of electrodes with higher bulk density requirements (except RP) and joint blanks need to be second baked, and the joint blanks need to be subjected to three impregnation and four baking or two impregnation and three baking.9. Graphitization: The purpose of graphitization is to improve the conductivity and torsion of the, improve the impact resistance and chemical stability of the GE, make the GE have lubricity, abrasion resistance, remove impurities, and improve purity. Usually the RP graphite electrode graphitization temperature range: - degrees, resistance range 8-11; HP graphite electrode required graphitization temperature range: - degrees, resistance range 6-8; UHP graphite electrode required graphitization temperature range: degrees or more, resistance range is below 6.10. Machining: The purpose is to achieve the required size, shape, precision, etc., and meet the use requirements of the electrode body and nipples through cutting. Graphite electrode machining is divided into two independent processes, the electrode body and the nipples.11. Finished product and package inspection: finished product inspection process includes appearance, weight, length, diameter, resistence, bulk density inspection, etc.; packaging inspection is inspected according to customers&#;requirements to check the label and mark whether is correct, and the packaging if strong, etc.If you has any inquiry about graphite electrodes, please feel free to contact our factory.
Hebei Heyuan New Material Technology Co., Ltd - Graphite Electrode Direct Plant
Introduction--What is Graphite Electrode?
Graphite electrodes are mainly made of petroleum coke and needle coke as raw materials and coal pitch as a binding agent. They are made through calcination, batching, kneading, pressing, roasting, graphitization and machining. They release electric energy in the form of arc in an electric arc furnace. Conductors that heat and melt the charge can be divided into ordinary power graphite electrodes, high power graphite electrodes and ultra-high power graphite electrodes according to their quality indicators.
The main raw material for graphite electrode production is petroleum coke. A small amount of pitch coke can be added to ordinary power graphite electrodes. The sulfur content of both petroleum coke and pitch coke cannot exceed 0.5%. Needle coke is also required when producing high-power or ultra-high-power graphite electrodes. The main raw material for aluminum anode production is petroleum coke, and the sulfur content is controlled to be no more than 1.5% to 2%. Petroleum coke and pitch coke should comply with relevant national quality standards.
Hebei Heyuan New Material Technology Co., Ltd - Graphite Electrode Direct Plant
Processing--How is it made out?
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Hebei Heyuan New Material Technology Co., Ltd - Graphite Electrode Direct Plant
(1) Processing forms of graphite materials
There are three main forms of graphite electrode processing: pressurized vibration method, CNC automatic forming method and mechanical processing method.
a. Pressurized vibration method: The pressurized vibration method requires special machine tools, and the shape of the electrode master mold is opposite to that of the electrode. The graphite material and the forming tool are placed relative to each other during processing, leaving a certain gap. The machining fluid mixed with water and abrasive is injected into it. While passing through the machining fluid, ultrasonic vibrations occur to the graphite and the forming tool. Under the action of abrasive impact, graphite is peeled off in minute amounts to form the required shape. The abrasive is SiC, B4C or diamond. The coarser the abrasive, the faster the processing speed. The machine tool uses sealed type and water curtain type for processing. Suitable for EDM processing in mass production situations.
b. CNC automatic forming method: CNC automatic forming method requires a special graphite electrode forming machine, which adopts CNC method and has an automatic tool changing device, which can accommodate multiple tools. In order to improve the processing environment, the processing graphite electrode is surrounded by a water curtain to prevent graphite dust from spreading around. In addition, wet machining methods can also be used, using water-soluble cutting fluid to prevent tool wear and graphite dust from flying. The machine tool has a high-performance filtering device that can separate cutting fluid and graphite chips, ensuring long-term continuous processing. It is an ideal special equipment for graphite electrode processing, and is suitable for mold electrode processing. However, its price is relatively high and its application in China is not yet common.
c. Mechanical processing method: Mechanical processing method is the main method used by general domestic mold production units.
Graphite materials can be processed by turning, milling, drilling and grinding. In addition, graphite materials are prone to flying dust during mechanical processing, which has adverse effects on processing equipment and operators.
(2) Processing procedures for graphite materials
a. Graphite immersed in oil. Before machining, graphite materials should be immersed in engine oil for dozens of hours to allow the oil to penetrate into the graphite materials so that dust will not fly during machining and a smoother surface can be obtained.
b. Paint and line. After the electrode is rough-machined on the surface, a thin layer of white paint is sprayed on the scribed surface and then scribed, so that the lines are clear and easy to machine.
c. Carry out mechanical processing.
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