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method and system for kuehlung the ruehrwelle and their ruehrarme and abfuehrung other in roesten of sulphur ores in a etagenofen incurred by kuehlluft ueberschuessigen waermemengen
method and system for kuehlung the ruehrwelle and their ruehrarme and abfuehrung other in roesten of sulphur ores in a etagenofen incurred by kuehlluft ueberschuessigen waermemengen