METHOD FOR DECREASING ELUTRIATION LOSS OF FINE IRON ORE IN FLUIDIZED BED TYPE REDUCING OPERATION

摘要

A method for decreasing the elutriation loss of fine iron ore in a circulati ng fluidized bed type reducing operation is disclosed. The method includes charging lime stone (CaCO3) or dolomite (CaCO3, MgCO3) in an amount of 3-6 vol% together with the fine iron ore into a fluidized bed type furnace. In another embodiment, the method includes the addition of a sludge in an amount of 0.2-5.0 wt% to the fine iron ore and mixing them thus coating the fine iron ore particles; drying the coated particles at a temperature of 105-800.degree.C for 1-24 hours and then charging the coated fine iron ore into a fluidized bed type furnace.