Top Heated Ceramic Lined Galvanizing Furnace
The many advantages of ceramic lined galvanizing baths should be well known to most galvanizers. The fact that molten zinc does not form a chemical composition with refractory materials, as it does by formation of zinc ferrite with iron in a steel kettle, prevents the inconvenience and high cost of kettle changes, as ceramic lined baths will have an indefinite life.
The ceramic lined galvanizing baths have over the years been subjected to continuous development. This have mainly been directed towards the design of the refractory lining, the refractory materials and supporting steel structure.
Most of the development work in this field has been carried out by CHE. The long life of CHE designed ceramic lined galvanizing baths, proves that any possibilities of zinc leakage or zinc penetration through the refractory lining due to thermal expansions and high hydraulic pressure, has been abolished, even at high temperature galvanizing.
Top heated baths of CHE design have been in continuous operation for nearly fifty years without any damage of the refractory bath lining. CHE has know-how and experience from installation of gas, oil and electric heated top heated baths of depth up to 2,8 m and length up to 17,5 m.
High temperature galvanizing at 560°C is used for galvanizing small components such as fasteners, threaded bolts, nails and brackets. High temperature galvanizing gives uniform and controllable coatings, also to silicon and aluminium killed steels.
Silicoat® – Ceramic Lined Galvanizing Furnace with Immersion Heating Rods
The development of the Silicoat® immersion heating rod has enabled a new concept for electric resistance heating of metals. With the unique physical and electrical properties of the rod, it can be installed directly in molten metals.
The total energy from the Silicoat® immersion rod is transferred directly to the metal by conduction. Hence, there is no energy loss from the energy source.
The Silicoat® immersion heating rods are applicable to the proven CHE design of ceramic lined galvanizing baths.
The voltage applied to the rods is limited to 50V, being transformed from line voltage through a multistep transformer.
The zinc temperature is controlled by PLC-unit with modem, connected to thyristors in the supply voltage line.
Silicoat® immersion heating rods and Ceramic Lined Galvanizing baths contribute to high thermal efficiency of the heating system, high power installations for high production rates in small zinc volumes and long life galvanizing bath.
High temperature galvanizing up to 610°C is used for galvanizing small components such as fasteners, threaded bolts, nails and brackets. High temperature galvanizing gives uniform and controllable coatings, also to silicon and aluminium kitted steels.