| 摘要 |
PURPOSE:To improve the reducing ratio and the dropping strength for burnt agglomerated ore by making raw material fine powdery iron ore the specific grain size at the time of producing pellet for raw material of the burnt agglomerated ore by coating powdery coke on the surface, after pelletizing by adding flux to the fine powdery iron ore. CONSTITUTION:At the time of producing the burnt agglomerated ore as the raw material for blast furnace or the raw material for directly reducing iron- making by an endlessly moving grate type burning furnace, the grain distribution of fine powdery iron ore as raw material is made to 30-95wt% of <125mum grain size and the remaining part of >=125mum grain size. The flux, such as lime, slaked lime, lime stone, bentonite, dolomite, water granulated blast furnace slag, etc., is added on this and kneaded together with water and pelletized into the green pellet having 3-13mm grain size, and the powdery coke is coated on this surface at 2.5-4.0wt% ratio. This is burnt in the endlessly moving grate type burning furnace and the burnt agglomerated ore having excellent dropping strength and reducing ratio is produced.
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