Patent · US Expired

Indirectly heated rotary tubular kiln

US4781580A · kind A · utility

5Cited by

10References

4Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Helmut Janz · Viersen, DE
Fritz Rodi · Moers, DE
Alfred Soppe · Issum, DE
Jakob Rademachers · Krefeld, DE

Key dates

Filing date	May 14, 1987
Grant date	Nov 1, 1988
Priority date	—
Expiry date	May 14, 2007

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF27B7/161
WIPO fieldThermal processes and apparatus
WIPO sectorMechanical engineering

Abstract

In a rotary tubular kiln for carrying out gas-solids reactions, comprising an indirectly heated, rotatable reaction tube with inner baffles which is provided with charging and removing devices for solid and gas inlet and outlet lines, the improvement which comprises forming the baffles as a central tube which is sealed on both sides and runs along the total length of the kiln, and a spiral which is tightly connected to the central tube and also to the outer rotatable tube. Lifting blades are uniformly distributed along the inner periphery of the rotatable tube. The kiln is suitable for carrying out oxidation, reduction, chlorination, roasting, decomposition, catalytic, annealling and/or cooling processes, e.g. the conversion of hematite to magnetite or goethite to iron.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.