High-temperature melting furnace comprising a vessel having a molten product extracting means surrounded by melting electrodes. A ceramic refractory lining covers the inner face of the vessel. Sealing means are provided for sealing off the whole of the face of the vessel from the exterior. Means are also provided for constantly blowing in a region located at the bottom of the vessel a small amount of inert gas into the lining which opposes penetration into the lining of gases liable to attack the metal of the support of the extracting means and the metal of the electrode rods in contact with the lining.
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