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논문 : 건식제련 ; 철광석의 가스환원반응에 있어서 원주형광석을 위한 모델 개발
강흥원 ( Heung Won Kang ),정우창 ( Uoo Chang Chung ),정원배 ( Won Bae Chung ),정원섭 ( Won Sub Chung ) 대한금속재료학회 ( 구 대한금속학회 ) 1998 대한금속·재료학회지 Vol.36 No.7
Two cylindrical models for the reduction of iron ores are proposed. One model is for the long cylindrical particle and the other for disc-shape particle. The determination method of the rate parameters included in these models are illustrated. The models are applied to the reduction data for a long-cylindrical pellet of which the height is 2.3 times longer than the diameter and a disc-shaped pellet of which thickness is as 0.34 time thick as the diameter. According to the application results, the fractional reductions calculated by the proposed models are on the good agreement of the observed ones and the reasonable values of the rate parameters are obtained.
논문 : 건식제련 ; 철광석의 가스환원반응속도에 미치는 광석형상의 영향
강흥원 ( Heung Won Kang ),김행구 ( Hang Goo Kim ),정우창 ( Uoo Chang Chung ),정원섭 ( Won Sub Chung ) 대한금속재료학회 ( 구 대한금속학회 ) 1998 대한금속·재료학회지 Vol.36 No.6
In order to investigate the effect of particle shape on the gaseous reduction rate of iron ore, iron oxide pellets of various shapes including the long cylindrical-and disc shape were reduced with CO-CO2 gas mixturein in the mixed-control regime. Experimental results showed that the reduction rate of the disc-shaped particle was the fastest among all and the long cylindrical particle followed. The experimental results were analyzed by the unreacted-core model for a non-spherical particle proposed in the previous study by the authors, which was intended for the particle of the non-spherical shape relatively near to the sphere. According to the analysis, this model was applicable for the cylindrical particles of which the height are in the range from a half to twice of the cylindrical diameter while the long cylindrical-and disc-shaped particle out of the above range were not. Based on the review of the experimental-and analysis results, the reaction aspect concept for the long cylindrical-and disc-shaped particle was discussed.
정원섭,강흥원,이일옥 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.12
The unreacted-core model has been extensively used for the analysis of the gaseous reduction rate of the iron oxide because of its simplicity and relatively a good agreement of the experimental result with the calculated reduction curve. However, the rate parameters in the model are known to be affected by many factors such as the reactivity, the diffusivity in the reactant zone and through the product layer, and the size- and shape of the solid particle, so that it is criticized that the applicability of this model is rather restricted. In this study, the applicability of the unreacted-core model was reviewed based on the intermediate model. It was found that the unreacted-core model showed a good applicability when Thiele's modulus was higher than 20 and effective diffusivity through the product layer was larger than 10 times of that in the reactant zone. However, it showed worser applicability when the effective diffusivity through the product layer becomes closer to that in the reactant zone even in case of a higher Thiele's modulus than 20.
NH₃가스 미량첨가 분위기에서의 CO-H₂혼합가스에 의한 과탄화철의 합성
정성실,정우창,강흥원,박응열,정원섭,박익민 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.11
The synthesis process of iron carbide was proceeded in two stages of reduction of hematite fines by H₂ gas, and carburization of the reduced metal by CO-H₂ gas mixture at 600℃. The surface of reduced iron was pre-treated with an addition of 0.05 vol% NH₃-Ar before carburization. The synthesized iron carbides were comprehensively explored by C/S analyzer (Low C/S determinator), Mossbauer spectroscopy, X-ray diffraction patterns (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy at various reaction times of 5, 10, 15, 20, 25, 30, and 35 min. By addition of a small amount of NH3 gas, the super iron carbides contained 10 wt% carbon were made, and such addition stabilized iron carbides. It was found that addition of NH3 gas played a major role in the formation of iron carbide without decomposition (Fe₃C→ 3Fe+C) of iron carbides and precipitation of free carbon. From these results, we succeed in synthesis of super iron carbide, Fe_(5)C₂, with a stable single phase without Fe and Fe₃C phases. (Received August 2, 2004)
정원섭,주상훈,강흥원,최낙준 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.1
In order to investigate the effect of particle shape on the gaseous reduction rate of iron ore, iron oxide pellets of different shape were reduced with CO-CO₂ gas mixture. A reduction model for a non-spherical particle was proposed. Applicability of the proposed model was examined by comparing the analysis results from this model and one of the existing models for non-spherical particle. According to the result of applicability comparison, the fractional reduction calculated by the former model were on the better agreement of the observed ones than by the latter model. Investigation revealed that the assumption of the proposed model was reasonable and practicable.