To prevent dropping of volatile matter 40 recondensed on a ceiling face 15 on a calcination reception object A by a simple means in a calcination furnace 10 for calcining the calcination reception object A generating the gaseous volatile matter by calcination.
A filter 31 equipped with vent holes of a size allowing passage of the volatile matter gasified by heating but not allowing passage of the volatile matter 41 recondensed after gasification is disposed in a higher position than a disposed position of the calcination reception object A in the calcination furnace 10. Preferably, the filter 31 is a web like rolled web 30, and when it becomes a clogged state by trapping the recondensed volatile matter 41, it is wound, and a new filter region is moved above the calcination reception object A.
Sekiya Mitsuo
Yasushi Hayakawa
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