Ar+O2 혼합가스 취입에 의한 용철의 탈탄 반응속도 (Decarbonization Kinetics of Molten Iron by Ar+O2 Gas Bubbling)

서지정보

· 발행기관 : 대한금속·재료학회
· 수록지 정보 : 대한금속·재료학회지 / 47권 / 2호 / 107 ~ 113페이지
· 저자명 : 손호상, 정광현

초록

Molten iron with 2 mass % carbon content was decarbonized at 1823 K~1923 K by bubbling Ar+O2
gas through a submerged nozzle. The reaction rate was significantly influenced by the oxygen partial pressure
and the gas flow rate. Little evolution of CO gas was observed in the initial 5 seconds of the oxidation; however,
this was followed by a period of high evolution rate of CO gas. The partial pressure of CO gas decreased with
further progress of the decarbonization. The overall reaction is decomposed to two elementary reactions: the
decarbonization and the dissolution rate of oxygen. The assumptions were made that these reactions are at
equilibrium and that the reaction rates are controlled by mass transfer rates within and around the gas
bubble. The time variations of carbon and oxygen contents in the melt and the CO partial pressure in the
off-gas under various bubbling conditions were well explained by the mathematical model. Based on the
present model, it was explained that the decarbonization rate of molten iron was controlled by gas-phase mass
transfer at the first stage of reaction, but the rate controlling step was transferred to liquid-phase mass
transfer from one third of reaction time.

영어초록

Molten iron with 2 mass % carbon content was decarbonized at 1823 K~1923 K by bubbling Ar+O2
gas through a submerged nozzle. The reaction rate was significantly influenced by the oxygen partial pressure
and the gas flow rate. Little evolution of CO gas was observed in the initial 5 seconds of the oxidation; however,
this was followed by a period of high evolution rate of CO gas. The partial pressure of CO gas decreased with
further progress of the decarbonization. The overall reaction is decomposed to two elementary reactions: the
decarbonization and the dissolution rate of oxygen. The assumptions were made that these reactions are at
equilibrium and that the reaction rates are controlled by mass transfer rates within and around the gas
bubble. The time variations of carbon and oxygen contents in the melt and the CO partial pressure in the
off-gas under various bubbling conditions were well explained by the mathematical model. Based on the
present model, it was explained that the decarbonization rate of molten iron was controlled by gas-phase mass
transfer at the first stage of reaction, but the rate controlling step was transferred to liquid-phase mass
transfer from one third of reaction time.

참고자료

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