Powder-and-gas reactions

Details Powder-and-gas reactions Powder-and-gas reactions

B - Operations, Transporting

01

J

23/233, 53/299,

B01J 12/00 (2006.01) B01J 8/16 (2006.01) C01G 37/02 (2006.01) C22B 23/02 (2006.01)

Patent

CA 1056579

ABSTRACT OF THE DISCLOSURE This invention relates to a method of and apparatus for bringing about reactions between a powder and a gas, in which the contact between the powder and reaction gas produces a chemical reaction. Powdery material flows downwardly along a vibratory spiral conveyor chute, while gas flows counter to the powder, preferably in excess. Mixing ramp arrangements are provided in the chute. These involve inclined ramp surfaces dividing the powder stream into two layers, and provisions for causing the initially uppermost layer to tumble down onto the chute bottom while the initially lowermost layer is still supported on its ramp. The latter then drops down, too, and now becomes the uppermost layer. The present invention is faster and provides a more uniform reaction and resultant product than known batch processing in roasting ovens.

218828

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