Furnace Technology
Tunnel kilns are usually used for

Roasting of pyrites
Drying/tempering of refractories
Melting of glass
Reheating of slabs

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Furnace Technology
The amount of combustible escaping uncon-sumed from the furnace, depends upon the

All of these
Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by change of direction)
Air supplied and furnace temperature
Burner design (thoroughness of mixing versus stratification)

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