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논문 : 건식제련 ; MgO 포화 CaO-MgO-Fe1O-SiO2-MnO-ΣMxOy계 슬래그와 용철간의 망간반응평형
박종민 ( Jong Min Park ),조만형 ( Man Hyung Dzo ) 대한금속재료학회 ( 구 대한금속학회 ) 1996 대한금속·재료학회지 Vol.34 No.11
The manganese reaction between the CaO-MgO-Fe1O-SiO2-MnO-ΣMxOy, slags saturated with MgO and molten iron was investigated by changing the MnO content from 2 to 30wt% in the temperature range of 1823K to 1973K. The activity coefficient of MnO and the manganese distribution were quantified in terms of the slag composition and temperature. The results obtained are as follows; 1) The activity coefficient of MnO is revealed to be dominated by the contents of Fe1O and MnO, and hardly affected by basicity and temperature. It can be written as follows; log γ MnO = -1.079(NMnO + 0.9NFeto) + 0.6394. 2) The equilibrium quotient kMn is controlled by basicity, and shows less correlation with contents of Fe1O and MnO. The following equation is obtained. logkMn = 0.00l[-1.651(%CaO) + 39.13(%MgO) + 4.64(%Fe1O) + 5.133(%MnO) + 11.86(%SiO2) - 99.7(%P2O5)] + 8086/T - 4.262
박종민,조만형,허완욱 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.12
The activities of iron oxides in CaO-MgO-Fe₁O-SiO₂-MnO-∑M_xO_y slags which are saturated with MgO and in equilibrium with molten iron were discussed in terms of the concept of the regular solution model as well as an ionic solution model suggested by Ishiguro & Okubo to quantify the oxygen potential of the BOF steelmaking slag. The results obtained are as follows; 1) By the regression analysis of the FeO activity with slag composition based on the Ishiguro and Okubo's ionic model, the following equation was obtained, logγ_(FeO) = -9.609N_(O^(2-)) + 12.58(N_(O^(2-))² - 6.062(N_(O²))³ + 2.935 2) From the analysis of the activities of FeO and Fe₂O₃ by introducing the regular solution model, it was revealed that the model is not adequate to quantify the activities of FeO and Fe₂O₃ of BOF steelmaking slag yet.
광학염기도를 이용한 MgO 포화 CaO-MgO-FetO-SiO2-MnO-ΣΜxOx 계 슬래그와 용철간의 인, 황 및 망간반응의 정량화
박종민,조만형 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.9
The behaviors of physico-chemical and metallurgical properties of CaO-MgO-Fe₁O-SiO₂-MnO-∑M_xO_y(M_xO_y=P₂O_5, Al₂O₃, TiO₂, CaF₂, S) stags were discussed in terms of the concept of the optical basicity. The stags were saturated with MgO and in equilibrium with molten iron, and its MnO contents was varied from 2 to 30wt% in the temperature range of 1823 to 1973K. The phosphate capacity and the activity of P₂O_5 were well correlated with the theoretically driven optical basicity, the sulfide capacity was related with the optical basicity after Wrampelmeyer et al. Also, the activity coefficient of MnO and the manganese capacity had good agreements with the optical basicity proposed in the previous work". Following equations were obtained as the results.
알루미늄 및 알루미늄-실리콘 합금에서의 철제거에 관한 연구
이동범,조만형,김화수,강수창,강경준 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.8
For the purpose of Fe removal in the aluminum and silumin melt containing Fe, multicomponent intermetallic compounds which were formed and precipitated were produced by the absorption filtration experiment. Four types of aluminum sample were made by use of 99.99wt.% aluminum, 12.5-50wt.%Fe ferro-aluminum, 10-20wt.% Mn-Al alloy, 25wt.%Si-Al alloy and 99.99wt.% zinc ball. They were Al-1-5wt.%Fe, Al-3wt.%Fe-2-6wt.%Mn, Al-3wt.%Fe-5wt.%Mn-1.5-7.5wt.%Zn, Al-0.6-4wt.%Fe-12.5wt%Si-1.3-4wt.%Mn. In the heating absorption filtration tower at 670℃ which is cylindrical graphite tube filled with alumina ball or cokes chip, the aluminum or silumin sample melts were made by the absorption filtration experiment. And the results are as follows. 1. Filtered Aluminum alloy having initial Fe concentration under 1.6wt.%Fe had no filtration effect. but avove that had the iron concentration about 1.6t.% that is hypoeutectic region. 2. Filtration of aluminum alloy sample containing both Fe and Mn showed the iron concentration under 0.4wt.%, when the Mn/Fe ration was 4/3. 3. Filtration of aluminum alloy sample containing Fe, Mn and Zn was same as Al-Fe-Mn system. The remaining amount of Mn was also the same. 4. The filtration efficiency of aluminum alloy sample containing only Fe was under 60%. This was probably contributed from the small size of formed intermetallic compound. The filtration efficiency of sample having Fe and Mn was between 70 and 80%. The Zn addition did not have an effect on the filtering efficiency of Fe. 5. The filtration effect of Silumin sample containing Fe was larger than the other cases. Using the alumina ball filter tower, the filtered mass showed. 0.29-0.34wt.%Fe, 0.17-0.33wt.%Mn, and using the cake chip filter tower, showed 0.27-0.35wt.%Fe. 0.17-0.33wt.%Mn.
저온환원분화 (低溫還元粉化) 에 미치는 알루미나의 영향
이철형,조만형,곽문기 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.8
Present study was carried out to investigate the effect of alumina content of sintered ore on the degradation. In order to investigate the effect of the crystallization depending on alumina contents, temperature and cooling rate, the tablets composed of first grade reagent were sintered in a electric furnnace. RDI(Reduction Degradation Index) was based on JIS(Japanese Industrial Standard) measured as a degree of reduction degradation. Optical microscopy, XRD, EDX, SEM and microhardness test were used to investigate the morphologies and properties of the iron ore sinter. Iron oxide transformed to another phases such as calcium-ferrite which resulted in the deterioration of RDI when the alumina contents was increased. With the results of SEM and EDX, the microcracks were found in glassy silicate when SFCA(Silico-Ferrites of Calcium and Aluminum) was crystallized. It was found that the more alumina contents was increased, the more microcracks were observed.
MgO포화 CaO-MgO-FetO-SiO2-MnO- ΣΜxOx 계 슬래그와 용철간의 횡반응
박종민,조만형 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.9
The sulfur reaction between the CaO-MgO-Fe₁O-SiO₂-MnO-∑M_xO_y, slags saturated with MgO and molten iron was investigated by changing the MnO content from 2 to 30mass% in the temperature range of 1823K to 1973K. The sulfur distribution was analyzed in terms of the slag composition and temperature. The results obtained are as follows; 1) The sulfur distribution ratio increases with the increase in B≡(CaO+MgO+MnO)/(SiO₂+P₂O_5+Al₂O₃,+TiO₂) as well as the decrease in temperature. Although iron oxide decreases the sulfur distribution ratio when B is 3.5 and above, it behaves reversely below 3.5. Following equations are obtained by analyzing the effect of slag compositions and temperature influencing the sulfur distribution ratio. 2) Upon many trials for analysing various sulfide capacities, the capacity has no relation with the temperature, and has following relations with the slag composition.