One is high quality high temperature electric calcination of anthracite or, with more graphite fragments or even all graphite fragments as aggregate, the green products after molding only after roasting (roasting temperature does not exceed 1200℃) no longer into graphitization furnace heat treatment, this kind of carbon block is called half graphitic carbon block.
Another kind of coke with more easy graphitization as aggregate, raw products after roasting and then into graphitization furnace at 1800 ~ 2000℃ temperature for heat treatment, this kind of carbon block is called half graphite (chemical) carbon block.
The former has higher strength and hardness, while the latter has better conductive property and overall effect. Graphite carbon block, with easy graphitization coke as raw material, graphitization treatment temperature should reach about 2500℃.The difference between half graphitic carbon block and graphite carbon block lies in the degree of orderly arrangement of the crystal lattice of the products, that is, the degree of graphitization is different. The degree of graphitization can be indicated by the resistivity of the product. The lattice of the graphite carbon block is almost in the state of ordered arrangement, and the resistivity is less than 15μΩm;The degree of graphitization of semi-graphitized carbon blocks is low or only partly graphitized, and the resistivity is 15 ~ 45μΩM.The maximum heat treatment temperature of half graphitic carbon block is about 2000℃, and the graphitic treatment temperature of graphitic carbon block is 2500 ~ 2800℃.
Common cathode carbon block, resistivity 50 ~ 60μΩM.Graphitized cathode is a conductive material used for cathode of aluminum electrolytic cell, which represents the development direction of electrolytic aluminum industry. With the technological progress and development of electrolytic aluminum industry, the electrolytic cell is developing towards a large capacity of more than 300kVA, and the requirements for cathode materials are higher. The main advantages of graphitized cathode are to strengthen current, improve current efficiency, achieve the purpose of increasing production and saving energy, and make the electrolytic cell run stably.
The larger the cell type is, the more obvious the operation stability effect is, and the more obvious the improvement of current efficiency is. The unit capacity of aluminum electrolytic cell using graphitized cathode is increased by 10-15%, and the power saving per ton of aluminum is more than 600kWh.Graphite cathode aluminum electrolytic cell is one of the priority materials in the electrolytic aluminum industry due to the obvious effect of energy saving, consumption reduction and emission reduction.
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Rongxing Group is China’s leading supplier dedicated to providing its customers with the quick quotes, superior quality products, competitive prices and fastest possible deliveries of carbon metallurgical materials and solutions.
Its main products are graphite electrode，electrode paste, calcined petroleum coke, and refractory. The range of product line covers carbon materials, graphite materials, refractory and water treatment materials. The annual production capacity of graphite electrode, electrode paste, calcined coke and refractory reaches 50,000 tons, 200,000 tons, 250,000 tons and 20,000 tons respectively. The company’s corporate headquarters is currently located in the Zhengzhou.
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