Selection of electrodes for glass electric melting furnace


  glass electric furnaceTechnology belongs to a link in the high-tech industrial chain. As a link in the high-tech industrial chain, the achievements made in the production and construction have attracted worldwide attention. The glass processing industry is inherently versatile. The demand for construction and construction is very large.

Among the metal electrodes, molybdenum electrode is the most common. Except lead-containing glass, molybdenum is a material suitable for melting a variety of glasses. Molybdenum has high melting point, good conductivity, high mechanical strength, low thermal expansion coefficient, easy processing and no pollution to glass liquid. It is an ideal electrode material. In 1986, a factory imported a lead crystalline glass all-electric melting furnace from Sorg Company. The melting pool of the electric melting furnace is hexagonal, electrodes are distributed on three pool walls and connected with three-phase transformer according to △ connection method or Y connection method. Its advantages are that balanced load is allowed for three phases, and current distribution in cross section of electric melting furnace is relatively uniform, which is conducive to uniform melting of batch materials. The area of the melting pool is basically the same as that of the clarifier. The melting pool is equipped with three layers of molybdenum electrodes with a diameter of 48mm, and the designed melting capacity is 5.4~6.6T/d. The electric melting furnace has a large capacity, the glass liquid stays in the melting pool for a long time, the melting rate is 2.6t/m2 d, and the unit consumption is 1.12kW h/kg glass.electric melting furnaceThe melting capacity has great potential, and its "turnover limit" is only 20% lower than the maximum melting capacity. In the melting of lead glass, due to the oxidation-reduction reaction of molybdenum and lead oxide, the molybdenum electrode is corroded, so the current density should be appropriately reduced to reduce the loss of molybdenum electrode, correspondingly reduce the loss of lead, improve the quality of glass and extend the life of the furnace. The electrode insertion depth is related to the electrode nature, quantity, current density, electric melting furnace structure and other factors. For example, the cylindrical tin oxide electrode is installed vertically, the insertion depth is about 250mm, and the electrode cannot be advanced during the operation of the electric melting furnace.


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