Relationship between the Aluminum and Oxygen and Sulfur Partitions for Molten Iron and a CaO-Al2O3-ZrO2 Slag in Equilibrium

Tanabe, Jun; Seki, Ichiro; Nagata, Kazuhiro

doi:10.2355/isijinternational.46.169

Cited by 10 publications

(3 citation statements)

References 14 publications

(13 reference statements)

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“…The determination of the activity of Al 2 O 3 has been reported by many researchers . Figure shows the historic timeline for the typical study of Al 2 O 3 activity measurement.…”

Section: Introductionmentioning

confidence: 99%

“…The determination of the activity of Al 2 O 3 has been reported by many researchers. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] Figure 1 shows the historic timeline for the typical study of Al 2 O 3 activity measurement. Lots of researchers from various countries have developed different methods to accurately measure the activity of Al 2 O 3 in the slag.…”

Section: Introductionmentioning

confidence: 99%

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Determination of Al₂O₃ Activity by Reference Slag Method in CaO–SiO₂–Al₂O₃–MgO Melts for Blast Furnace Slag with High Al₂O₃ at 1873 K

Zheng

Guo

et al. 2019

steel research int.

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With the increase in using high Al2O3 iron ore, the content of Al2O3 in blast furnace slag has increased sharply in recent years. Thus, the activity of high Al2O3 slag in the blast furnace slag system needs further study. Herein, the activity of Al2O3 (a(Al2normalO3)) in CaO–SiO2–Al2O3–MgO slag equilibrated with molten Cu at 1873 K is determined by applying the reference slag method. Isoactivity contours for Al2O3 in the (CaO + MgO)–SiO2–Al2O3 pseudoternary system are achieved for blast furnace slag, and the effects of R (mass% CaO/mass% SiO2) and MgO/Al2O3 on the activity of Al2O3 are discussed. When Al2O3 = 20 wt% and MgO/Al2O3 = 0.4, with R increasing from 1.10 to 1.30, the activity of Al2O3 decreases from 0.0423 to 0.0244. When Al2O3 = 20 wt% and R = 1.25, with MgO/Al2O3 increasing from 0.35 to 0.55, the activity of Al2O3 decreases from 0.0470 to 0.0366. The reference slag method, herein, is feasible based on the experimental results and the reference slag method is simple, reasonable, and of high accuracy.

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“…The determination of the activity of Al 2 O 3 has been reported by many researchers . Figure shows the historic timeline for the typical study of Al 2 O 3 activity measurement.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination of Al₂O₃ Activity by Reference Slag Method in CaO–SiO₂–Al₂O₃–MgO Melts for Blast Furnace Slag with High Al₂O₃ at 1873 K

Zheng

Guo

et al. 2019

steel research int.

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“…Recently, Tanabe et al observed that the sulfur distribution ratio (log L S ) between the molten iron equilibrated with the CaO-Al 2 O 3 -ZrO 2 slags saturated by CaAl 4 O 7 or CaZrO 3 phases linearly increased with increasing aluminum content (log [mass%Al]) in iron melt with the slope of 2/3 at 1873 K. 4) From this result, they concluded that the oxygen potential between metal and slag was controlled by the [Al]-[O] equilibrium reaction. Although the nitride capacity of the CaO-SiO 2 -Al 2 O 3 -ZrO 2 slags was reported by Sasabe et al, 5) the effect of ZrO 2 on the sulfide capacity of the calcium silicate slags that were used for sulfur removal from the austenitic stainless steel melts is not available in the literature.…”

Section: Introductionmentioning

confidence: 99%

Effect of ZrO2 Addition to the CaO-SiO2-MgO-CaF2 Slags on the Sulfur Removal from the 16Cr-14Ni Stainless Steel Melts

Park¹,

Min

2006

Mater. Trans.

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The equilibrium distribution ratio of sulfur between the 16 mass%Cr-14 mass%Ni stainless steel melts and the CaO-SiO 2 -MgO-ZrO 2 -7 mass%CaF 2 (B(= (mass%CaO)/(mass%SiO 2 ) = 2.0) slags was measured at 1873 K to clarify the role of ZrO 2 in the desulfurization reaction based on the sulfide capacity concept. The sulfur distribution ratio linearly decreases on increasing the oxygen partial pressure with the slope close to À1=2 in the logarithmic scale at a fixed sulfur potential and temperature. The sulfide capacity of the slags is constant up to about (mass%ZrO 2 )=f(mass%ZrO 2 ) þ (mass%MgO)g ¼ 0:3, followed by a linear decrease on increasing the Z=ðZ þ MÞ ratio. The effect of ZrO 2 substitution for MgO on the decrease in the (apparent) sulfide capacity at Z=ðZ þ MÞ > 0:3 could be explained by the decrease in the basicity of the liquid slag phase due to the formation of CaZrO 3 from the computational estimations for the phase equilibria and the thermodynamic activities of slag components. Based on the X-ray diffraction patterns of the slags, it was confirmed that the peak intensity for the Ca 2 SiO 4 is strong through the entire composition range, while the intensity of the peaks corresponding to the CaZrO 3 is relatively strong in the composition of Z=ðZ þ MÞ ¼ 0:42 and 0.64. The sulfide capacity can be expressed as a linear function of the mass fraction of CaZrO 3 in the slags investigated in the present study, while that exhibits a wide distribution at a relatively narrow optical basicity region, resulting from the effect of ZrO 2 on the basicity of the liquid slag phase due to the formation of CaZrO 3 .

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Deoxidization Equilibria with Zirconium and Sulfur Partition for Molten Iron/CaO-Al₂O₃-ZrO₂Slag at 1873K

Seki

Tanabe

Nagata

2008

steel research international

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The relationship of zirconium and oxygen concentrations with sulfide capacity was clarified using equilibrated molten iron with CaO‐Al2O3‐ZrO2 slag at 1873 K. Al2O3 and CaO‐stabilized ZrO2 crucible saturated compositions were equilibrated with CaO‐2Al2O3 and crucible solid solution (Css) in the CaO‐ZrO2 system, and with CaOZrO2 and Css, respectively. From the concentrations of zirconium and oxygen dissolved in molten iron, ZrO2 activities of the slag of the Al2O3 crucible and ZrO2 crucible compositions were determined to be 0.885 and 0.0343, respectively. On the other hand, the sulfur distribution ratio of the ZrO2 crucible saturated composition was higher than that of the Al2O3 crucible saturated composition. Sulfide capacities were determined to be 6.30×10−5 and 8.07×10−5 in the Al2O3 and the ZrO2 crucible saturated compositions, respectively.

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Relationship between the Aluminum and Oxygen and Sulfur Partitions for Molten Iron and a CaO-Al2O3-ZrO2 Slag in Equilibrium

Cited by 10 publications

References 14 publications

Determination of Al₂O₃ Activity by Reference Slag Method in CaO–SiO₂–Al₂O₃–MgO Melts for Blast Furnace Slag with High Al₂O₃ at 1873 K

Determination of Al₂O₃ Activity by Reference Slag Method in CaO–SiO₂–Al₂O₃–MgO Melts for Blast Furnace Slag with High Al₂O₃ at 1873 K

Effect of ZrO<SUB>2</SUB> Addition to the CaO-SiO<SUB>2</SUB>-MgO-CaF<SUB>2</SUB> Slags on the Sulfur Removal from the 16Cr-14Ni Stainless Steel Melts

Deoxidization Equilibria with Zirconium and Sulfur Partition for Molten Iron/CaO-Al₂O₃-ZrO₂Slag at 1873K

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Relationship between the Aluminum and Oxygen and Sulfur Partitions for Molten Iron and a CaO-Al2O3-ZrO2 Slag in Equilibrium

Cited by 10 publications

References 14 publications

Determination of Al2O3 Activity by Reference Slag Method in CaO–SiO2–Al2O3–MgO Melts for Blast Furnace Slag with High Al2O3 at 1873 K

Determination of Al2O3 Activity by Reference Slag Method in CaO–SiO2–Al2O3–MgO Melts for Blast Furnace Slag with High Al2O3 at 1873 K

Effect of ZrO<SUB>2</SUB> Addition to the CaO-SiO<SUB>2</SUB>-MgO-CaF<SUB>2</SUB> Slags on the Sulfur Removal from the 16Cr-14Ni Stainless Steel Melts

Deoxidization Equilibria with Zirconium and Sulfur Partition for Molten Iron/CaO-Al2O3-ZrO2Slag at 1873K

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Determination of Al₂O₃ Activity by Reference Slag Method in CaO–SiO₂–Al₂O₃–MgO Melts for Blast Furnace Slag with High Al₂O₃ at 1873 K

Determination of Al₂O₃ Activity by Reference Slag Method in CaO–SiO₂–Al₂O₃–MgO Melts for Blast Furnace Slag with High Al₂O₃ at 1873 K

Deoxidization Equilibria with Zirconium and Sulfur Partition for Molten Iron/CaO-Al₂O₃-ZrO₂Slag at 1873K