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.
