C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 1/10 (2006.01) C22B 19/02 (2006.01)
Patent
CA 2427389
This invention relates to a method for stabilizing a fluidized bed used in roasting by adjusting the oxygen content of the roasting gas in the bed. The fine-grained material for roasting is fed into the furnace above the fluidized bed and the roasting gas, which causes the fluidizing, is fed into the bottom of the furnace through a grate. In this method, the total amount of oxygen in the roasting gas to be fed and the average total oxygen requirement of the material to be roasted are calculated and the ratio between them regulated so that the oxygen coefficient in the bed is over 1.
L'invention concerne un procédé permettant de stabiliser un lit fluidisé utilisé dans un grillage au moyen d'une régulation de la teneur en oxygène du gaz de grillage dans le lit. La matière à grains fins utilisée pour le grillage est acheminée dans le four au-dessus du lit fluidisé, et le gaz de grillage, qui entraîne la fluidisation, est acheminé dans la partie inférieure du four à travers une grille. Selon ce procédé, on calcule la teneur totale en oxygène du gaz de grillage à introduire dans le four, ainsi que la moyenne totale des besoins en oxygène de la matière à griller, et le rapport des résultats obtenus est régulé pour que le coefficient d'oxygène du lit soit supérieur à 1.
Metsarinta Maija-Leena
Nyberg Jens
Rytioja Aija
Taskinen Pekka
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Outokumpu Oyj
Outotec Oyj
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