低 Al_2O_3 高結晶水鉱石使用焼結鉱の不均一焼成機構

概要

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Increasing a usage of the pisolite ore in a sinter plant often results in a decreased yield and strength of the product. These negative features are anticipated to be caused by the formation of the non-uniform sintered layer at the middle or on the bottom part of the sintered ore bed, where sometimes the low-Al_2O_3 pisolite ore is richly distributed. The low-Al_2O_3 pisolite ore, the so-called easily "fusible ore", due to its high assimilation rate, produces a large amount of melt with very low viscosities which directly contributes to forming the excessively dense structure and deteriorating the gas permeability, especially in the lower part of the ore bed, and then leads to the decreased production yield. In the present study, it was clarified that the "fusibility" control of ore layer and the viscosity control of the formed melt could be the effective countermeasures to prevent the non-uniform sintering. It was also suggested to maintain the ratio of the low-Al_2O_3 pisolite ore to the infusible ore constant throughout the ore bed in order to attain the proper gas and melt distributions inside the ore bed and therefore to improve the operation performance.
社団法人日本鉄鋼協会の論文
1996-01-01