Phosphate Capacity of CaO–SiO2–MnO–FeO Slag Saturated with MgO

Cho, Moon Kyung; Park, Joo Hyun; Min, Dong Joon

doi:10.2355/isijinternational.50.324

Cited by 14 publications

(12 citation statements)

References 15 publications

(20 reference statements)

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“…In region D

(X_{normalCaO} / X_{{normalAl}_{2} {normalO}_{3}} < 1.0)

, abnormal behavior of CaO‐Al 2 O 3 ‐SiO 2 slags, which have a strong negative mixing free energy, is shown with an independent relationship with the CaO activity. It is in accordance with the previous studies on sulfide and phosphate capacities . Moreover, the inflection point (vertical dashed line) in region D is deficient of Ca 2+ as expressed in Equation , from which a change in the sulfur ionic stability can be inferred, which will be discussed in Section 3.3.…”

Section: Resultsmentioning

confidence: 99%

“…It is in accordance with the previous studies on sulfide 25 and phosphate capacities. 38 Moreover, the inflection point (vertical dashed line) in region D is deficient of Ca 2+ as expressed in Equation 2, from which a change in the sulfur ionic stability can be inferred, which will be discussed in Section 3.3. Figure 5 shows the dependence of Al 2 O 3 /SiO 2 on the sulfide capacity of CaO-Al 2 O 3 -SiO 2 slags at 1873 K. For constant CaO/Al 2 O 3 > 1.0, the sulfide capacity exhibits a linear relationship with Al 2 O 3 /SiO 2 owing to an increase in basicity (a O 2À ) with the increase in CaO.…”

Section: Methodsmentioning

confidence: 99%

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Cationic effect of charge compensation on the sulfide capacity of aluminosilicate slags

et al. 2018

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The effect of CaO on the sulfide capacity of CaO‐Al2O3‐SiO2 slags was studied from the viewpoint of the ionic structure of alumina in slag. The aluminum coordination number was analyzed using 27Al 500‐MHz solid nuclear magnetic resonance spectroscopy and the results were compared with those of the sulfide capacity analysis. The sulfide capacity of slag, in the peralkaline region (XnormalCaO/XnormalAl2normalO3>1.0), exhibited a linear relationship with respect to basicity (anormalO2−) as excess free Ca2+ formed a 4‐coordinated aluminum unit structure ([IV]Al; AlO45−) and stabilized the sulfide ions (γnormalS2−). However, sulfide capacity in the peraluminous region (XnormalCaO/XnormalAl2normalO3<1.0) exhibited a nonlinear relationship with respect to basicity (anormalO2−) owing to the structure of higher‐coordinated aluminum units ([V]Al, [VI]Al; Al3+) and the relative lack of Ca2+. Therefore, the sulfide capacity of high Al2O3‐bearing slags strongly depended on the basicity (anormalO2−) and stability of sulfide ions (γnormalS2−), which depended on the competitive behavior of Ca2+ owing to the structural changes in Al2O3. The effect of the aluminum coordination number on the sulfide capacity was discussed in detail using an analysis of the slag structure and thermodynamics model.

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“…In region D

(X_{normalCaO} / X_{{normalAl}_{2} {normalO}_{3}} < 1.0)

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Cationic effect of charge compensation on the sulfide capacity of aluminosilicate slags

et al. 2018

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“…The stability of phosphate ions in slag can be understood by examining the excess free energy of P 2 O 5 molecule (DG Ex P 2 O 5 ) as described in the following equations [20,34] :…”

Section: ½9mentioning

confidence: 99%

“…CaO-based slag is traditionally used in the steelmaking process because of its high refining ability and low cost. [10][11][12][13][14][15][16][17][18][19][20][21][22] Previous studies generally reported that phosphate capacity and the distribution ratio of phosphorus increased with the increasing CaO content, thereby increasing the stability of P 2 O 5 by decreasing the activity coefficient of P 2 O 5 in the slags. In other words, dephosphorization ability is strongly affected by CaO activity in CaO-based slags, and thus the phosphorus equilibria in CaO-saturated highly basic slags have been reported.…”

Section: Introductionmentioning

confidence: 99%

Effect of Direct Reduced Iron (DRI) on Dephosphorization of Molten Steel by Electric Arc Furnace Slag

Heo

Park

2018

Metall Mater Trans B

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We investigated the effect of direct reduced iron (DRI) addition on dephosphorization of molten steel by electric arc furnace (EAF) slag at 1823 K (1550°C). Various phenomena such as CO gas evolution and slagmaking by gangue oxides in DRI were experimentally observed at each reaction step. Thermodynamic behaviors of phosphorus, oxygen, and carbon were strongly dependent on DRI content. Basicity, which is the thermodynamic driving force of dephosphorization, decreased with the increasing DRI content because SiO 2 concentration in the slag was proportional to DRI addition. The excess free energy of P 2 O 5 increased with the increasing SiO 2 content in slag. A higher DRI content made dephosphorization difficult by decreasing the basicity and stability of P 2 O 5 in the slag. Therefore, when using DRI in EAF process, it is very important to control the basicity of slag.

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“…Reducing the phosphorus content in steel is one of the critical factors to enhance the steel properties. Since the 1940s, researchers have worked on the distribution of phosphorus between hot metal or steel and slag. − These researchers used Ar, − Ar–CO mixture, − CO, CO/CO 2 , or N 2 /CO for the gas phase. Others worked on theoretical thermodynamics and modeling approaches. ,− …”

Section: Introductionmentioning

confidence: 99%

Phosphorus Distribution between Liquid Iron and Magnesia-Saturated Slag in H₂/H₂O Atmosphere Relevant to a Novel Ironmaking Technology

Mohassab

Sohn

Kim

2012

Ind. Eng. Chem. Res.

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As a part of a research project that aims to develop a novel ironmaking process using hydrogen flash reduction of iron ore concentrate, experimental determination of the phosphorus distribution ratio (L P ) between CaO−MgO (saturated) −SiO 2 − Al 2 O 3 −FeO slag and molten iron was determined in the temperature range 1550−1650 °C. Oxygen partial pressure was controlled by H 2 /H 2 O equilibrium in the range of 10 −10 −10 −8 atm. Under these conditions applicable to the proposed process, L P was 9−21. The proposed process is expected to produce iron with phosphorus content 7−14 times lower than in the iron produced by the blast furnace, considering the relative amounts of phosphorus inputs in the two processes and the low P content in the slag under the blast furnace conditions. This will decrease the need for dephosphorization in the steelmaking stage.

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Phosphate Capacity of CaO–SiO2–MnO–FeO Slag Saturated with MgO

Cited by 14 publications

References 15 publications

Cationic effect of charge compensation on the sulfide capacity of aluminosilicate slags

Cationic effect of charge compensation on the sulfide capacity of aluminosilicate slags

Effect of Direct Reduced Iron (DRI) on Dephosphorization of Molten Steel by Electric Arc Furnace Slag

Phosphorus Distribution between Liquid Iron and Magnesia-Saturated Slag in H₂/H₂O Atmosphere Relevant to a Novel Ironmaking Technology

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Phosphate Capacity of CaO–SiO2–MnO–FeO Slag Saturated with MgO

Cited by 14 publications

References 15 publications

Cationic effect of charge compensation on the sulfide capacity of aluminosilicate slags

Cationic effect of charge compensation on the sulfide capacity of aluminosilicate slags

Effect of Direct Reduced Iron (DRI) on Dephosphorization of Molten Steel by Electric Arc Furnace Slag

Phosphorus Distribution between Liquid Iron and Magnesia-Saturated Slag in H2/H2O Atmosphere Relevant to a Novel Ironmaking Technology

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Product

Resources

About

Phosphorus Distribution between Liquid Iron and Magnesia-Saturated Slag in H₂/H₂O Atmosphere Relevant to a Novel Ironmaking Technology