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黃龍吉,李相和,金榮熙 동아대학교 공과대학 부설 한국자원개발연구소 1992 硏究報告 Vol.16 No.1
The effect of air : propane ratios on the microstructure of carburized layers, internal oxidation characteristics and carburizing atmospheres during fluidized-bed carburizing under the nitrogen-6% propane base atmosphere were investigated At air : propane ratios less then 3 : 1 carbon potential of fluidized bed carburizing at mosphere was shown to be settled down to good carburizing condition, while carbon potential was shown to be decreased abruptly and CO₂ content increased exceedingly at air : propane ratios greater than 3 : 1. Under the same carburizing condition, the effective case depth of the carburized specimens decreased with Nicontent. At the given ratio of air to propane, the depths of internal oxidation layer appered to be increased almost linearly as carburizing time and the total contents of Si, Mn and Cr of steel increased. For air : propane ratios less than 3 : 1 at 930℃ it was concluded that the most effective carburizing condition and the control of internal oxidation could be obtained easily.
電氣爐 製鋼粉塵을 발즈法으로 還元 할때에 爐塊 生成에 관하여
黃龍吉,李相和,金榮熙,李成龍 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.2
The steelmaking dust treatment process has been established through reducing volatilization method in rotary kiln. The more content of zinc in reduced pellets and basicity of pellet is in the range of 1.5~3.0, the more working time needed in rotary kiln, because of decreasing wall accretion. A portion of well forming kiln coating in the furnace is a fourth of the total length from the outlet. Constitutes on the furnace wall accretion composed of the mixtures such as Fe, FeO, Fe₂O₃, Fe₃O₄, ZnO and CaO-SiO₂system, and formation of kiln coating is decreased by adding coke ratio.