Fracture resistant electrodes for a carbothermic reduction furnace
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[0038] According to this invention, the as-shipped anode or needle coke particles are initially screened into two fractions, with a coarse-grain fraction containing particles larger than 5 mm. The coarse grain fraction is then online-fed into a mill having stronger milling-paddles and yielding grains of 200 μm to 3 mm. In parallel, a fine-grain fraction is fed into a mill designed for finer grains and providing particles of 25 μm to 300 μm size. The two fractions are then joined once more and the resulting powder contains coke particles with a Gaussian particle size distribution between 25 μm and 3 mm.
[0039] The power is pre-heated to 100-125° C. in a rotating-drum heating unit and then mixed at 150 to 160° C. in an intensive mixer, such as an Eirich mixer (Maschinenfabrik Gustav Eirich GmbH & Co KG, Hardheim, Germany), together with 15% (w / w) binder pitch.
[0040] In one further embodiment, up to 5% (w / w) graphite dust from machining of graphite electrodes and green scrap from othe...
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