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홍성훈 ( Seong Hun Hong ),전병혁 ( Byoung Hyuk Jeon ),위창현 ( Chang Hyun Wi ),신동엽 ( Dong Yub Shin ),유병돈 ( Byung Don You ),서성모 ( Seong Mo Seo ),박종민 ( Jong Min Park ) 대한금속·재료학회 2009 대한금속·재료학회지 Vol.47 No.12
As a fundamental study in the development of a distillation process for ferromanganese alloy melts, the evaporation behavior of an electrolytic manganese melt under reduced pressure was investigated. The melt temperature, vacuum degree, surface area of the melt, and reaction time were considered as experimental variables. The amount of vaporized manganese increases linearly as the reaction time increases, and the evaporation of manganese was promoted by increasing the temperature and surface area of the melt. In the pressure range below the equilibrium vapor pressure of manganese, the amount of vaporized manganese per unit surface area of the melt increased sharply with a decrease of the pressure in the reaction chamber. An empirical equation for the evaporation rate of manganese was derived by regression analysis. The evaporation coefficient of manganese was determined to be approximately 3.84×10(-3) (g·K1/2)/(Pa·cm2·min) under the investigated conditions.
CaO-Fe(t)O-MgO-SiO2(≤5mass%)-ΣMxOy계 슬래그의 MgO포화용해도와 용철 간 산소평형
신동엽 ( Dong Yeop Shin ),이주호 ( Joo Ho Lee ),홍성훈 ( Seong Hun Hong ),유병돈 ( Byung Don You ),서성모 ( Seong Mo Seo ),박종민 ( Jong Min Park ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 대한금속·재료학회지 Vol.48 No.8
Oxygen equilibrium and the solubility of MgO have been measured in the CaO-Fe(t)O-MgO-SiO2(≤5 mass%)-ΣMxOy slag in equilibrium with liquid iron in the temperature range of 1550 to 1700℃. The effect of oxides on the MgO solubility, and a method for calculating the solubility of MgO using slag composition and temperature, were discussed. The solubility of MgO is increased with increasing temperature and Fe(t)O content, and with decreasing basicity (C/S). The effect of ΣMxOy on the solubility of MgO is a dilution effect due to the increase in slag volume. The activity and activity coefficient of Fe(t)O decreased with increasing basicity (B). The effect of temperature on the activity was negligible. The value of ρ=Fe3+/Fe2+ increased with the increase of the slag basicity (B") and the decrease of the Fe(t)O content in the slag.
손호상,서성모 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.1
KR desulphurization facilities has been adopted to Steelmaking Plant I in Pohang Works, POSCO since 1976. However, it has been more important than ever to improve desulphurization efficiency with increasing demand of high-quality steel. Therefore, water model and plant scale experiments were conducted to improve desulphurization efficiency in KR equipment by inserting a certain baffle on ladle bottom or wall. By the application of a baffle on ladle bottom or wall, the perfect mixing time was decreased to 20-42% and higher disperse and penetrating degree of particles were observed by giving turbulence to helical flow of fluid compared with that of the conventional condition. The plant scale equipment experiments show that using a certain baffle on ladle bottom or wall increase desulphurization efficiency in KR.