Electrode paste is a crucial element of the manufacturing process of metals like titanium and steel. It is utilized in shaping as well as melting of steel. Its high carbon content ensures effective reduction reactions leading to superior-quality ferroalloy products. The absence of ash within the paste can help minimize undesirable impurities and further increases the efficiency of production. Technology advancements in the area of formulations for electrode paste continue to drive the market's growth. A shift towards green practices and efficiency for industrial processes is also boosting the need for top-quality electrode paste.
The invention is an electrode paste designed for carbon graphite electrodes used in electric furnaces for the production of metals, steel, and other alloys. It is made through mixing in a compatible way carbonaceous and graphite material with sugar (or other carbonate solids) in the form of a powder without added reagents and by adding an optional dispersant and liquid elements. The mixture that is created is put in instead of the pre-baked carbon paste into the Soederberg electrode. It is possible to obtain a self-baking Soederberg electrode that does not differ from the typical pre-baked carbon electrode regarding its mechanical property.
The electrode paste created by this invention releases very small amounts of aromatic polycyclic hydrocarbons when baked in comparison to commercial paste. In particular, the emission of benzo(a)pyrene in the invention are much lower than those of the commercial paste. The invention's electrodes can also withstand the extreme stress of thermal energy and is a key aspect for the successful operation of the electric an arc furnace.
For this purpose they tested Green 4a, Green 5a and Green 8 electrodes in an oven designed for electric Arc furnaces located in the University of Milan with a temperature of 400degC with a time of exposure that was 7 hours. The emissions from each one of these electrodes was analysed using a portable emission measuring device. The results showed that the electrodes of the invention were able to stand up to temperature fluctuations and last longer than conventional electrodes. Also, the electrodes were found to have a low PAH emissions factor, and that they could operate under normal conditions. These results show that electrodes are safe to use in electric arc kilns, without any other safety safeguards. The electrodes cost much less than standard baked electrodes because they do not need fuel to warm up or huge cranes required for moving them about or fix the electrodes in position. This makes this invention attractive for application of electric arc furnaces in the productions of steel as well as its alloys. It also can be used for other areas in which a carbon electrode that self-bakes is required. The invention is an important advance in technology.
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