Procedure and device for drying and/or calcining of powdery materials
OwnerDieter Roddewiginventor
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Abstract
Procedure and device for drying and/or calcining powdery material. The device includes at least one feed mechanism, a heated treatment area, and at least one withdrawal mechanism for the material. The treatment area is provided with a base that can vibrate and through which gas can flow.
Claims32
A device for treating by selectively including drying and calcining powdery calcium sulfate hydrate material, comprising:
- at least one treatment area means;
- feed mechanism means for feeding material to said treatment area means;
- withdrawal mechanism means for withdrawing material from said treatment area means;
- at least one essentially horizontal base means disposed in said treatment area means for receiving said powdery calcium sulfate material thereon, said base means being adapted to vibrate or oscillate, and also being adapted to have hot air or hot gas flow therethrough from below;
- and
- transport means for conveying at least part of a stream of said material back from said withdrawal mechanism means to said feed mechanism means of said base means thereof respectively to the feed mechanism means of further base means arranged in distant relationship to said first mentioned base means in order to achieve an effect to automatic pelletizing of the material.
A method of treating by selectively including drying and calcining finely divided chemical or desulfurization gypsum that predominantly has a grain size of less than 100 .mu.m, said method including the step of conveying said material that is to be treated over base means in treatment area means, with hot air or hot gas flowing through said base means from below, and with said base means being continuously oscillated or vibrated at low amplitude, thereby fluidizing the stream of material over said base means, said step of conveying including successively conveying said material several times through a given treatment area means respectively through several treatment areas disposed one after the other in any desired arrangement to achieve automatic pelletizing of the material.
Dependencies are inferred from the claim text.