Glass & Oxides

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Some oxides and salts have thermal and electrical insulating properties at room temperature and become conducive at high temperatures. Due to ionic conduction, the electrical resistance of oxides (1-10 Ω.cm at 1,500°C) means they can be heated and melted by induction. 

Because they have weak thermal conduction at low temperatures and their resistivity decreases as the temperature goes down, the self-crucible direct induction technique can be applied using an equal skin depth to radius of load ratio.

A self-crucible is when a melt is kept inside an insulating shell (gangue) made of the same solid material to be melted. The bath can reach temperatures of 2,500°C without any contact between the bath and the inductor (no product contamination). 

There are various startup techniques:

  • Radiant load
  • Gas burner
  • Inductive load

Self-crucible direct induction melting is an ideal solution for continuous or batch melting processes with overflow or bottom tapping (induction spout). 


This high-performance technology is industry-ready, flexible and can effectively be used to melt a wide range of workpieces with excellent energy efficiency. 

Applications

• Crystal melting

• Special or technical glass melting

• Refractory oxide melting, developing phosphates

• Waste vitrification (residue from fume purification of household waste incineration, asbestos, etc.).

Advantages

  • High melting temperatures above 2,500°C 
  • Maximum energy efficiency (1-1.5 kWh/kg of glass cast)
  • Low maintenance, no wearing parts
  • Easily adjustable
  • Wide use range (50-1,000 kg/production hour) with inductive powers of 100-2,000 kW
  • Good thermal consistency for bath (no hot points and includes a cold roof)
  • Flexible enough for production changes (load changes) 

 

 



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