The information of graphite carbon cathode block

graphite carbon cathode block
graphite carbon cathode block decription:Cathodes to high-quality anthracite, coke, graphite as the raw material of charcoal. Used as the cathode of an aluminum reduction cell. It is masonry in the cell, also known as the bottom of the charcoal at the bottom. The characteristics of cathodes from the dual role of conductivity and composition of the electrolytic cell lining. The production of aluminum cathodes high temperature. Molten salt erosion resistance and electrical conductivity, thermal conductivity, good and high mechanical strength, good thermal shock resistance and resistance to sodium attack and strong features, which is conducive to aluminum electrolytic production of energy saving and slots increase in life.
Cathodes types of products, quality requirements, the selection of raw materials and the use of process conditions, the basic cathode carbon block divided into three categories for the common cathode carbon block, the semi-graphitic carbon block and graphitic carbon block. The common cathode carbon block to the 1250 ~ 1350 ° C calcined anthracite as main raw material. Semi-graphitic carbon block according to the production process is divided into two. One is high-quality high-temperature electric calcined anthracite. Or more of graphite fragments or all of the graphite fragments aggregate, after forming the green body products only after calcination (calcination temperature does not exceed 1200 ° C) no longer enter the graphite furnace heat treatment, the carbon block known as semi-graphitic carbon block. Another with more easily graphitized coke aggregate, Health Products roasting, the graphite furnace temperature of 1800 ~ 2000 ° C heat treatment, this charcoal, said semi-graphite () charcoal. Former strength, high hardness, which the conductive properties and the overall effect is better. Graphitic carbon block to easy graphitization coke as raw material, graphitization temperature should reach about 2500 ℃. Semi-graphite charcoal and graphite carbon block difference is that the different levels of the product lattice ordered, that the graphitization degree different. The size of the products, the resistivity can be used to represent the high and low degree of graphitization. Lattice of graphitic carbon block basic in the ordered state, the resistivity is less than 15μΩ • m; low degree of graphitization of the semi-graphitic carbon block or only part of the graphite, resistivity 15 the ~ 45μΩ • m. In the process, the performance of the heat treatment temperature, the heat treatment of semi-graphitic carbon block maximum temperature about 2000 ℃, the graphitic carbon block, graphite processing temperature of 2500 ~ 2800 ℃. Common cathode carbon block, the resistivity of 50 ~ 60μΩ • m.
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