Skull pot for melting or refining inorganic substances

Abstract

According to the invention, the skull pot is provided with the following characteristics: a pot wall (1), a bottom (3) and an induction coil (9) which surrounds the pot wall (1) and by means of which high-frequency energy can be coupled into the contents of the pot. The pot wall (1) is made of a ring of metal pipes (1.1) which can be connected to a cooling medium. Slits are embodied between adjacent metal pipes (1.1). The metal pipes (1.1) are bent at a right angle at the upper ends thereof in such a way that said pipes extend towards the outside, when the pot wall (1) is viewed from above, and form a collar (2). The collar (2) is surrounded by an additional wall (upper wall 4). The upper edge of said wall is situated on a higher level than the collar (2) in such a way that the melt covers the collar (2) during operation.

Description

technical field [0001] The invention relates to a so-called smelting furnace for melting or refining glass or glass ceramics. Background technique [0002] The molten pool composed of refractory material is corroded by the high temperature glass melt above 1650°C, so its durability is poor, and the manufactured glass contains bricks, nodes and scars formed by the molten pool material. [0003] Furthermore, the use of electrically assisted heating is severely limited at temperatures above 1650° C., because the corrosion of the electrodes, for example molybdenum electrodes, increases dramatically and the glass is heavily stained due to contamination. [0004] Aggressive glasses, such as those necessary for certain optical applications, aggressively attack ceramic refractories during melting, especially when already melted, even at relatively low temperatures. Intense attack on the molten pool is both uneconomical in reducing the durability of the furnace walls, and does not a...

AI Technical Summary

Problems solved by technology

This is unfavorable for use as refining equipment, as the gas bubbles cannot rise or rise only insufficiently through the cold surface layer, or cause violent foaming

[0012] 2. When using burner auxiliary heating, the sulfur-containing burner exhaust gas condenses on the cooling tube of the cooled slag shell melting furnace, and causes corrosion of copper due to the formation of sulfuric acid

This drastically shortens the service life of the slag smelting furnace

[0013] 3. Aggressive glass may cause corrosion of water-cooled copper components in the upper furnace

Staining of the molten glass due to direct peeling off of the surface of the eroded cooling tube or due to the transport of metallic impurities into the molten glass through the gaseous state

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