Rotary hearth furnace

F - Mech Eng,Light,Heat,Weapons – 27 – B

Patent

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F27B 3/06 (2006.01) C21B 13/00 (2006.01) C21B 13/10 (2006.01) C22B 5/10 (2006.01) F27B 9/16 (2006.01) F27B 9/30 (2006.01) F27D 7/00 (2006.01)

Patent

CA 2213668

Rotary hearth furnace for the treatment of minerals, comprising an annular chamber (1) provided with feeder means (4, 104) and discharge means (5, 105, 205) for the material, disposed adjacent one to another in a certain sector of the said chamber (1), a plurality of burners (111, 211) arranged all along the annular chamber (1) on the side walls (101) and on the top wall (201) thereof, means for extracting (3) the discharge gases, and means for transferring the gases from a first zone of the chamber downstream of the feeder means (4, 104) and upstream of the gas extraction means (3), with respect to the direction of rotation of said hearth (301), into a second zone upstream of the material discharge means (5, 105, 205) and downstream of the gas extraction means (3); said means for transferring are means for the forced conveying of the gases by suction at said first zone and by pressure delivery at this second zone; said means being provided with means for regulating the said forced conveying.

Four à sole rotatif pour le traitement des minéraux comprenant une chambre annulaire (1), un dispositif d'alimentation (4, 104) et un dispositif de décharge (5,105, 205) du matériel; ces dispositifs étant placés l'un près de l'autre dans une certaine zone de la chambre (1), plusieurs brûleurs (111, 211) placés tout le long de la chambre annulaire (1), dans la paroi latérale (201), et ,dans la paroi supérieure (201), un dispositif d'extraction des gaz (3) de refoulement et un dispositif de transfert des gaz de la première zone de la chambre en aval du dispositif d'alimentation (4, 104) et en amont du dispositif de décharge (3), quant au sens de rotation du four à sole (301), à une deuxième zone en amont du dispositif de décharge du matériel (5,105, 205) et en aval du dispositif d'extraction des gaz (3); le transfert des gaz est réalisé par extraction forcée c'est-à-dire par suction des gaz se trouvant dans la première zone pour ensuite les refouler sous pression jusqu'à la deuxième zone; des mécanismes assurent la régulation de l'extraction forcée.

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