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Slag/metal 간의 탈황평형에 대한 ion 세적 해석
심재동,만곡지랑 대한금속재료학회(대한금속학회) 1982 대한금속·재료학회지 Vol.20 No.1
To formulate the sulfur partitioning between basic steelmaking stags and metal in terms of the ionic treatments, the thermodynamic relation between equilibrium quotients and cationic concentrations proposed by Flood et al have been applied to the measured values. The results obtained are as follows. 1. Sulfur equilibrium is expressed by following equations. Stag/metal ; log {(N_o^(2-)/N_s^(2-) ·([a_s]/[a_o])} = -1.47N'_(ca)^(2+) - 1.92N'_(Fe)^(2+) - 3.15N'_(Mg)^(2+) Gas/slag ; log {{(N_o^(2-)/N_s^(2-) ·(P_s₂/P_o²)^½} = 2.35N'_(ca)^(2+) + 2.79N'_(Fe)^(2+) + 4.03N'_(Mg)^(2+) N_(A-) and N'_(M^+) are ionic Fraction and electrically equivalent fraction in the stags respectively. 2. The distribution ratio of sulfur between slags and metal is expressed by following equation. log {N_s^(2-)/[a_s]} = (-936/T + 1.375) + log C'_s - log [a_o] or, = (5214/T - 1.228) + log C'_s - log a_Fe_tO log C'_s { = N_s^(2-)·(P_o₂/P_s₂)^½} = - (2.35 N'_(ca)^(2+) + 4.03 N'_(Mg)^(2+)) + log(1 - N_(sio)₄- ) 3. The values of log { N_s^(2-)/[a_s] } are in good agreement with the measured values in the composition range of (CaO+MgO)/SiO₂> 1.7 for Fe_tO-SiO₂- CaO - MgO(sat) slags.
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MgO 포화의 염기성제강 slag 와 용철간의 S 의 분배평형
심재동,만곡지랑 대한금속재료학회(대한금속학회) 1981 대한금속·재료학회지 Vol.19 No.10
A study has been made of the distribution equilibria of sulfur between liquid iron and stags of Fe_tO-MgO, Fe_tO-SiO₂-MgO and Fe_tO-SiO₂-CaO-MgO systems saturated with MgO. 1) The distribution ratio of sulfur, Ls, in Fe_tO-SiO₂-MgO(sat) slags increases as Fe_tO content increases, as a result of the corresponding decrease in the amount of (SiO₂+MgO) content. 2) In Fe_tO-SiO₂-CaO-MgO(sat) slags, the values of Ls increase with the molar ratio of bases to acid, and as Fe_tO content increases, the values of Ls increase progressively at the higher basicity than about 2.0, but less basic stags result in a increases of Ls. 3) It is considered that Fe_tO contributes to the increase of oxygen potential rather than a_(o 2)- in the higher basic range, while Fe_tO contributes to the increase of a_(o 2)-in the less basic range. 4) The sulfur equilibrium in Fe_tO-MgO(sat) slags is expressed by the equation of Log{(%S)·[a_o]/[a_s] } = -4,560/T+2.22, and the value of ΔH˚is estimated to 21 ㎉/㏖. But due to the compensation of endothermic effect by the corresponding increase with temperature in [a_o] , the values of Ls are found to be nearly independent of temperature in the experimental range. 5) The sulfide capacity, Cs, decreases considerably as SiO₂content increases, and is fairly correlated with the modified base concentration, N'_(Base) (= N_(cao)+0.8N_(FeO) +0.5N_(MgO)), regardless of slag systems and compositions. The order of desulfurizating power is CaO > FeO > MgO.
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용철과 제강 slag 간의 산소 및 인의 분배평형에 대한 정규용액 model 의 적용
심재동,정순효,만곡지랑 대한금속재료학회(대한금속학회) 1981 대한금속·재료학회지 Vol.19 No.3
The approximate validity of the regular solution model for canons was examined to formulate the thermodynamic properties of steelmaking slags and to express quantitatively the equilibrium reaction between slag and metal. 1) The regular solution model was satisfied for multi-component stags such as Fe_tO-SiO₂-MgO, Fe_tO-SiO₂-CaO-MgO and Fe_tO-SiO₂-CaO-MgO-P₂O_5 systems, and the following values were obtained as interaction energies between cations. α_(15)(Fe^(2+)∼Mg^(2+))=3.070㎈, α_(25)(Fe^(3+)∼Mg^(2+))=-5,620㎈, α_(35)Si^(4+)∼Mg^(2+))=-30,500㎈, α_(45)(Ca^(2+)∼Mg^(2+))=4,500㎈, α_(36)(Si^(4+)∼P^(5+))=11,000㎈, α_(46)(Ca^(2+)∼P^(5+))=-125.000㎈, α_(56)(Mg^(2+)∼P^(5+))=-85,000㎈ 2) It was confirmed that applying the values of interaction energy to the regular solution model had enough certainty to estimate the oxygen content in liquid iron within the accuracy of ±10% over the wide range of slag compositions from basic to acidic stags. 3) Simple regular solution approximation was less favorable to apply for the phosphorus distribution between liquid iron and stags. It was proposed that a further modification of the model considering composition dependence of α_(ij) should be necessary to express the phosphorus equilibrium with a mathematical formula.
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