Graphite electrode for electrothermic reduction furnaces, electrode column, and method of producing graphite electrodes
a graphite electrode and electrothermic reduction technology, applied in the direction of electrical equipment, domestic applications, conductive materials, etc., can solve the problems of high electricity cost, high process energy consumption, and loss of aluminum yield
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example 1
[0057] 85% anode coke having an average particle size of 6 mm and 15% coal-tar pitch were mixed in an intense mixer at 150° C. The mixture was then cooled and extruded to about 600 mm diameter× about 2400 mm long green electrodes. The green electrodes were processed as described above. The physical properties of these electrodes (GE etectrothermic) compared to those of graphite electrodes for steel production (GE steel) as well as Söderberg electrodes are shown below.
Electrode typeGEelectrothermicGEsteelSöderbergBulk Density(g / cm3)1.621.751.38Open Porosity(%)251634Specific electrical(μOhm m)114.529resisivityThermal Conductivity(W / mK)1001808Iron content(%)0.050.2>1
[0058] Due to the lower graphitization temperatures, the graphite electrodes of this invention (GEelectrothermic) have a higher specific electrical resistivity and lower thermal conductivity compared to those of graphite electrodes for steel production (GEsteel). This renders them suitable with regard to the requirements ...
example 2
[0059] 80% anode coke having an average particle size of 6 mm and 20% coal-tar pitch were mixed in an intense mixer at 150° C., cooled, and extruded to about 330 mm diameter× about 2100 mm long green cylindrical bodies. The green cylindrical bodies were processed as the electrodes as described above. After graphitization, out of each cylindrical body 3 graphite pins were machined, having a double-conical shape with threaded surface to mate with the electrode threads. The physical properties of both, pins and corresponding electrodes, essentially matched each other. The assembled electrode column did not crack under thermal stress.
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