Refractory for DC EAF

 There are three basic types of dc arc furnaces, namely ABB, Clecim and GHH. Different types of dc arc furnaces are divided according to the structure of the bottom electrode, which shows the importance of the bottom electrode. The bottom electrode of ABB type dc arc furnace is conductive with conductive refractory, and the bottom surface is cooled by wind. While in GHH, many small steel needles (20-50 mm in diameter) are embedded in the bottom, and the bottom surface of metallurgical spare parts is also wind-cooled. The bottom electrode of Clecim is 1 ~4 thick steel rods, and the lower end is cooled with copper water cooling jacket. On the basis of these three types, various forms such as steel sheet type, water-cooled bottom electrode type and composite bottom electrode type of steel bar and copper bar were developed.

The life of dc arc furnace bottom electrode is essentially the life of refractory. For Clecim bottom electrode, the electrode sleeve brick has magnesia, magnesia carbon, magnesia aluminum and magnesia chromium refractory. In Europe, carbon-free zonal bricks are generally used, while in Japan, thermal shock stability is considered to be a major problem, and high carbon tt containing magnesia-carbon bricks should be used. In order to further improve the thermal shock resistance and corrosion resistance of cask bricks, magnesium-alumina spinel materials and magnesium-chromium bricks were used in Europe. Clecim bottom electrode is to rely on hot repair to maintain high life, so the repair material and construction effect is extremely critical, the current use of repair material is mainly magnesium dry ramming material.

For steel needle or steel plate bottom electrode conductive dc arc furnace, steel needle or steel plate between the use of dry materials, there are also made of prefabricated parts, mainly magnesia refractory.?Mgo-c materials?are now used in Japan to improve life. It is impossible to improve the life of bottom electrode by improving the performance of refractory material. Therefore, metallurgical spare parts in recent years to carry out hot repair work abroad, the hot repair material requirements are conductive refractory materials (the conductive steel needle and steel sheet buried), mainly have magnesium iron conductive ramming material, magnesium carbon conductive ramming material, magnesium calcium carbon conductive ramming material.

Article Source:Refractory for DC EAF
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