Seal and Trommel for Rotary Kiln.
U S Pat 3 532 330 1970 Oct; :
A trommel is secured to the end of a rotary kiln between axially concentric bearing surfaces. A swiveled inlet caps the trommel at the end opposite the kiln. A housing encloses the trommel and terminates at each end with seals riding on the bearing surfaces, achieving a rotary atmospheric seal. A duct joined to the trommel housing provides sealed access to the trommel.
U.S. Pat. 3,532,330, Oct. 6, 1970; Chem. Abstr. Not Found