酸素富化と排ガス循環を組み合わせた焼結プロセスの適正操業条件(塊成鉱)(<特集>製銑プロセスの機能強化と新展開)

概要

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An advanced sintering process was proposed on the basis of mathematical models and was verified by pot tests. This process is characterized by combining exhaust gas recirculation with oxygen enrichment in order to meet the future environmental regulations as well as to keep the productivity. The main results obtained are as follows : (1) The models clarify that the introduction of the oxygen enrichment in the first half and the exhaust gas recirculation in the latter half of the sintering process gives better coke combustion rate and sinter quality than other possible alignments. (2) The models also show that with the constant O_2 quantity provided, the concentrated O_2 supply in a short time helps reduce the sintering time because of the balance between combustion rate and cooling rate of the sinter bed. (3) The pot test results were in good agreement with the models. The suitable O_2 content of 28∿30% and O_2 injection time of 2∿3 min were consequently obtained. (4) The proposed process did not cause the deterioration of sinter qualities such as reducibility although the change in O_2 content would affect the occurrence of hematite/magnetite phase in sinter microstructures.
2001-05-01