B - Operations – Transporting – 08 – B
Patent
B - Operations, Transporting
08
B
B08B 5/02 (2006.01) B22C 5/18 (2006.01)
Patent
CA 2053184
ABSTRACT OF THE DISCLOSURE The present invention concerns a process and a device for cleaning the grain surfaces of contaminated granular bulk material. The invention is particularly suited to final-cleaning of, in particular, thermally pre-regenerated sand (for example used foundry sand). According to the method of the invention, the bulk materials which are to be cleaned or final-cleaned are charged with a high pressure gas flow which maintains a fluidised bed of the bulk material, and creates a condition of turbulence within the fluidised bed in such a way that cleaning takes place while avoiding excessive impact or rebound stresses on the grains. Cleaning of the grains occurs primarily at the walls (which may be fixed or movable) only by friction or scouring stress on the grain surfaces. The device of the invention is equipped with a container having an inlet and outlet for bulk materials and a gas-permeable flow bottom for forming a fluidized bed. The device includes at least one nozzle, which is located above the flow bottom, and which is connected to a high-pressure gas source. The nozzle serves to direct the high-pressure gas flow into the interior of the fluidized bed.
G. Ronald Bell & Associates
Kuttner Gmbh & Co. Kg
LandOfFree
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