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Waelz Kiln

Zn recycling kiln, process by which Zn oxide is obtained.
At 1,200ºC, Zn evaporates, which, when reacted with the gaseous base of the kiln, will be transformed into Zn oxide or Waelz oxide.
A refractory brick with very low permeability and porosity is needed to avoid the infiltration of Alkalis and Zn vapour.