GLASS MELTING FURNACE

摘要

PURPOSE:To prevent a salt from being volatiled and enable a continuous taking-out processing to be performed when a compound containing a large amount of salt is processed to form a state of glass by a method wherein a molten glass discharging port is arranged at a bottom part of melting tank, a molten salt flow passage is formed near a surface of liquid, a heating electrode for performing a direct heating of the glass and an electrolysis electrode for the molten salt are provided. CONSTITUTION:AC power is supplied to a molybdenum electrode 5 near a bottom part of a furnace, and after a glass temperature is increased, a silicon carbide heater 7 located on the upper part of a melting tank 1 is removed. At first, a raw compound containing no salt is continuously supplied to the upper part of the melting tank and a height of the molten glass in the melting tank is increased to a desired value. Then, a glass flowing-out pipe 3 made by Inconel Inc. located at the bottom part of the melting tank is heated by an electric furnace 4 which is provided with the silicon carbide heater 7 and a thermocouple 8, respectively. The temperature is kept constant, thereby a normal or regular operation for making a continuous flowing-down of a specified amount of glass is continued while the upper surface of the melting tank is covered with a cold raw material. Thus, the carbon electrode 6 located at the upper part of the melting tank is inserted into the glass. DC electric power is supplied and then a polarization phenomenon is prevented.