Apparatus for roasting fine grained material

Details Apparatus for roasting fine grained material Apparatus for roasting fine grained material

1986-07-08

1987-11-24

Yuen, Henry C.

Heating

Tumbler-type rotary - drum furnace

Having combustion products generated in or fed to drum

432 58, 432 14, F27B 702

Patent

active

047086440

ABSTRACT:
An improved apparatus for roasting fine material which includes recirculation of at least partially roasted material through the roasting furnace for further roasting. An adjustable gate is included in the recirculation system for controlling the quantity of material recirculated. A high temperature fluidizing gravity conveyor is used in the recirculation system to maintain a low profile for the system. The invention utilizing a system for classifying large particles so that they may be removed from the recirculation system. Gas locks are included for preventing the short circuiting of hot gases. The system also includes overflow conduit in the event of a plug or blockage in the system.

REFERENCES:
patent: 3904353 (1975-09-01), Bosshard et al.
patent: 4201546 (1980-05-01), Herchenbach et al.
patent: 4270900 (1981-06-01), Shy et al.
patent: 4298340 (1981-11-01), Herchenbach et al.
patent: 4381916 (1983-05-01), Warshawsky
patent: 4425092 (1984-01-01), Brachthause et al.
patent: 4490109 (1984-12-01), Krutzner
patent: 4530661 (1985-07-01), Herchenbach et al.
patent: 4557688 (1985-12-01), Nielsen
patent: 4568276 (1986-02-01), Fujisawa

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