http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
논문 : 건식제련 ; 용융 Fe-C 합금중 As의 활동도에 관한 연구
배병철 ( B. C. Bae ),민동준 ( D. J. Min ) 대한금속재료학회 ( 구 대한금속학회 ) 1998 대한금속·재료학회지 Vol.36 No.6
From the viewpoint of the removal of tramp element, the thermodynamic properties of arsenic in molten Fe-C alloy was investigated between 1523K to 1823K by using chemical equilibrating technique. The effects of the arsenic, carbon concentration and the temperature on the activity coefficient of arsenic were also measured. The activity coefficient of arsenic in carbon saturated iron was measured as 0.09 at 1673K. The following activity coefficient of arsenic in molten iron was derived in terms of interaction parameters and temperature. □ By combining the present experimental results and the reference for thermodynamic properties of arsenic, the possibility of the removal of arsenic from molten iron by evaporation was discussed.
고온에서의 Fe-C 합금중 Sb 의 열역학적 거동에 관한 연구
민동준,배병철 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.1
The thermodynamic behaviors of antimony in molten iron-carbon alloys at high temperature was investigated in connection with the possibility of removal of tramp elements by chemical equlibrating technique. The effects of antimony, carbon content and temperature on the activity coefficient of antimony in molten iron was determined by measuring distribution ratio of antimony between Fe-C alloy and silver. Though the effect of Sb content on activity coefficient, ε^(Sb)_(Sb) , was null at the lower than 0.1wt% Sb, the effect of carbon on Sb activity coefficient, ε^(Sb)_(Sb) was estimated as 10.32 at 1673K. The dependence of the acvtivity coefficient of antimony on temperature was determined as follows ; For carbon saturated iron : ln γ ^(Fe-C○)_(Sb)=-14280/T+10.20 For molten iron : ln γ^O_(Sb)=-23000/T+13.19 Combining the effects of temperature and carbon, the activity coefficient in Fe-C alloy could be expressed as follows; ln γ ^(Fe-C_(Sat.)_(Sb)=(-23000/T+13.19)+ε^O_(Sb)·X_o where, ε^O_(Sb)= 64260/T-28.09 and [%C]^(sat)_(Fe)=0.647+2.54X 10^(-3)·T(K) The possibility of the removal of antimony from molten iron by evaporation was discussed.
민동준,송효석,이창희,유병돈 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.11
Equilibrium experiments between gas and slag were carried out to understand the thermodynamic behavior of nitrogen in CaO-SiO₂-CaF₂ slag system at 1600℃. The solubility of nitrogen in this slag system increased as the oxygen potential decreased and as the reaction temperature increased. The values of the nitride capacity has a minium at bout 2.0 slag basicity having higher values in both more acidic and basic region. This may be explained by two mechanisms for nitrogen dissolution ; incorporated nitride ion and free nitride ion state. In slag with 2.0 basicity or less, MgO content increased the nitride capacity slightly at higher slag basicity, however, nitride capacity decreased with MgO content. The effects of BaO to substitute CaO on nitride capacity showed similar behaviors as MgO. These complex relationship between basicity of slag and nitride capacity is explained by using optical basicity. It was found that nitride capacity and optical basicity had a clear relationship even in the different basic oxide systems.
고온에서의 Fe-C-S 합금 중 Cu 의 열역학적 거동에 관한 연구
민동준,허기행,김대환,이창희 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.12
The thermodynamic behavior of copper in molten Fe-C-S alloy at high temperature was investigated by chemical equilibrating technique. The effects of copper, carbon, sulfur content and temperature on the activity coefficient of copper in molten pure iron and carbon saturated were was determined by measuring the distribution ratio between silver and Fe-C-S-Cu alloy. The activity coefficient of copper in molteniren and carbon saturated iron at infinite dilution of copper were measured 11.02 and 28.50 at 1823K respectively. The interaction parameter between copper and copper, sulfur and carbon in molten iron at 1823K, was estimated as follows; ε^(Cu)_(Cu) = -4.80, ε^S_(Cu) = -2.544, ε^C_(Cu) = -4.60 The dependence of the activity coefficient in molten Fe-C alloy on temperature was determined as follows; For molten pure iron : lnγ^(oFe)_(Cu) = 4370/T For Fe-2wt%C : lnγ^(oFe-2wt%C)_(Cu) = 0.72 + 3840/T For carbon saturated iron : lnγ^(oFe_C)_(Cu) = 1.11 + 4100/T Combining the effect of temperature and the alloying component, the activity coefficient of copper could be expressed as follows ; lnγ^(Fe-C-S)_(Cu) = 4370/T·(1-X_(Cu))² + (2.15 + 4600/T)·2.54·X_s The possibility of removal of copper from steel by slag refing and evaporating technique was discussed.
정우창,민동준,정원섭,정원배,정현철 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.10
In a smelting reduction method, the fluidized bed reactor is one of the most possible reactors for prereduction of fine iron ore. In this work, the reduction degree of fine iron ore(106∼212, 212∼250㎛) were measured from hematite to iron CO 100% gas in a batch-type fluidized bed. The rate parameters incluiding the present study were determined by using the reduction data. The reduction rate of fine iron ore increased with increasing temperature and gas flow rate, whereas that was decreased with increasing ore diameter and ore inventory. The apparent activation energy for the reaction is measured to be about 59-75 kJ/㏖. The fundamental data for the development of pre-reduction furnace by fluidized bed and direct iron-making process could be acquainted from this study.
백종문,이홍기,고정호,민동준 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.12
The kinetic experiments have been made on iron oxidation in slag by oxidizing gases at 1387∼1500℃. The effect of temperature, FeO content and oxygen potential of gas on the reaction rate have been examined. The iron oxidizing rate is considerably increased with increasing temperature and FeO content in slag. It was also found that the rate controlling step of reaction have been depended on the temperature, FeO content in slag and (P_(co₂)/P_(co) as an oxygen potential at gas/slag interface. The dependence of the overall reaction rate constant on temperature and initial FeO content in slag at 1450℃ could be expressed as follows; log k_(overall) = -0.36-10,820/T[㏖/㎠·sec·atm] k_(overall) = 1.04×10^(-7)(wt%FeO)^(0.75)[㏖/㎠·sec·atm] In condition of high oxygen potential such as high FeO content and (P_(co₂)/P_(co)), the chemical reaction at interface between slag and gas might play a important role as a rate controlling step of overall reaction, which is controlled by the dissociation of CO₂ at slag/gas interface. But in case of low (P_(co₂)/P_(co)), mass transfer and chemical reaction at interface between slag and iron become important as a rate controlling step. The reaction mechanism of iron oxidization in slag by gas have been discussed in terms of rate constant for elementary reactions.