Abstract: A longitudinal sealing (20), which, as a rule, extends below the rotating tube (30), is proposed to increase the heating efficiency in a rotary tubular kiln, in which a rotating tube (30) is surrounded, like a bowl, by heating tunnel (32) and is indirectly heated by a heating medium. It is designed in the shape of a separation wall between the entry side (38) and the exit side (40) for the heating medium in the heating tunnel and consists of a rigid part (22) and a flexible part (24), situated thereon and adaptable to the rotating tube profile.

Abstract: A rotary drum for carrying out chemical processes at elevated temperatures which includes a rolling body arrangement for cleaning the interior of the drum, a stationary feed end for the material to be treated, a mounting device for the rolling body arrangement on the feed end of the rotary drum, and a rotary bearing that allows the rolling body to roll on the inner side of the rotary drum wall and which connects the rolling body to the mounting device. The rotary drum further including an oblong scraping device which is arranged between the mounting device and said rotary bearing. Since the scraping device is mounted on the mounting device, it is able to carry out a pendulum motion in at least one direction, but unable to turn about itself, and the end of the scraping device on the side of the rotary bearing is connected to the rotary bearing in such a way that it is able to carry out a pendulum motion in at least one direction.