Regeneration of bulk materials

Details Regeneration of bulk materials Regeneration of bulk materials

1987-10-23

1989-04-18

Favors, Edward G.

Furnaces

Refuse incinerator

Means for cleaning by combustion

110204, 110245, 110346, 241DIG10, F23D 1400

Patent

active

048216542

ABSTRACT:
In order to rationalize the operation of foundries and to avoid environmental stresses, it is endeavored so to rework used molding sand accruing as black sand and to free it from binder residue, so that this sand can be used without restriction like new sand. To achieve this aim through thermo-mechanical regeneration the black sand is heated in predetermined, relative low height layer in a fluidized bed furnace to a temperature exceeding 500.degree. C., preferably 750.degree. C. Through the swirling motions of the heated black sand, preferably supported through strong vibrations of the supporting base, the thermal destruction of the enveloping binder particles and a mechanical liberation of the sand grains form their enveloping binder remains is achieved. By means of a forced throughout (e.g. through appropriate vibrations or by means of a scraper conveyor) a uniform throughput with constant layer height is achieved which can be stabilized by means of additionally installed webs so that the desired mode of operation is ensured. By means of pre and post-treatment heat exchangers, the energy requirement can be kept low, while an appropriately high combustion temperature ensures at the same time the creation of environmentally safe oxidation products.

REFERENCES:
patent: 3841240 (1974-10-01), Wentworth et al.
patent: 4508277 (1985-04-01), Andrews
patent: 4628838 (1986-12-01), Love
patent: 4648332 (1987-03-01), Goedhart
patent: 4667609 (1987-05-01), Hardison et al.
patent: 4708775 (1987-11-01), McGregor et al.
Ruzbehi, "Thermo-Mechanical Regeneration" Industrie, Nr. 26, 3/29/85, p. 32.

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