Oxidation Kinetics and Oxygen Capacity of Ti-Bearing Blast Furnace Slag under Dynamic Oxidation Conditions

Zhang, Li; Zhang, Wu; Zhang, Juhua; Li, Guangqiang

doi:10.3390/met6050105

Cited by 14 publications

(9 citation statements)

References 13 publications

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“…Based on their composition, industrial titaniabearing slags 1,21,28 conform to the Al 2 O 3 -CaO-SiO 2 -MgO-TiO 2 -Ti 2 O 3 system. 29 The phase relations of the Al 2 O 3 -CaO-SiO 2 -MgO-TiO 2 system have been intensively investigated under varying conditions 27,[29][30][31][32][33][34][35][36][37][38][39][40][41][42] by using different thermodynamic modeling tools and experimental methods.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Phase Relations of the SiO2-MgO-TiO2 System in Air at 1500°C

Chen

Wan

Shi

et al. 2021

JOM

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We investigated the phase relations of the SiO2-MgO-TiO2 system in air at 1500°C using the high-temperature isothermal equilibration/quenching technique, followed by x-ray diffraction measurements and direct phase analysis using scanning electron microscopy coupled with x-ray energy dispersive spectrometry. One single liquid phase domain, five two-phase domains (liquid-TiO2, liquid-cristobalite, liquid-MgO·SiO2, liquid-2MgO·SiO2, and liquid-MgO·2TiO2), and five three-phase regions (liquid-TiO2-MgO·2TiO2, liquid-MgO·SiO2-cristobalite, liquid-TiO2-cristobalite, liquid-MgO·SiO2-2MgO·SiO2 and liquid-2MgO·SiO2-MgO·2TiO2) were observed. We constructed a 1500°C isothermal phase diagram based on the experimentally measured liquid compositions. We compared simulations using MTDATA and FactSage thermodynamic software and their databases with the experimental results obtained in this study. These results can be used to provide guidelines for updating the MTDATA and FactSage titania-bearing thermodynamic databases by reassessing the thermodynamic properties of the phase with new experimental data.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on the Phase Relations of the SiO2-MgO-TiO2 System in Air at 1500°C

Chen

Wan

Shi

et al. 2021

JOM

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“…At the intense oxidation temperature, the oxidation rate increases dramatically. This is due to the considerable increase in the diffusion rate at higher temperatures [21][22][23][24], resulting in a sharp increase in the oxidation rate. After the FOT, the oxidation reaction stops rapidly.…”

Section: Methodsmentioning

confidence: 99%

Effect of Oxidation Temperature on the Oxidation Process of Silicon-Containing Steel

Zhou

et al. 2016

Metals

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Abstract:The oxidation behavior of silicon-containing steel was studied by applying segmented heating routes similar to the atmosphere and heating process in an industrial reheating furnace. The oxidation tests were carried out on a simultaneous thermal analyzer at heating temperatures of 1150˝C-1300˝C. The morphologies of Fe 2 SiO 4 were observed by SEM, and the penetration depths of the Fe 2 SiO 4 layer at different oxidation temperatures were determined by using the Image-Pro Plus 6.0 software. The results show that at heating temperatures ě1235˝C, the oxidation rate and total oxidation mass gain have no relation with the heating temperature; the mass gain versus time follows a linear law after about 1164˝C (lower than the eutectic temperature of fayalite). In addition, the oxidation rate first decreases slowly and then drops from 1190˝C to 1210˝C during the isothermal holding stage. With the increase in temperature, the oxidation rate and mass gain also increase gradually; the relationship between the mass gain and time is close to a parabolic law. Moreover, at a heating temperature of 1150˝C, the oxidation rate decreases rapidly during the isothermal holding stage, and the mass gain versus time follows a parabolic law.

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“…For the current study, the composition of the electrolyte was fixed as the study focused on the direct use of ironmaking slag from the process, without the use of a supporting electrolyte. The elemental composition of Slag#1 given in Table I reports iron as Fe 3 O 4 since the sample was oxidized before XRF measurements, but iron in melter slag at process conditions would be in the form of low valency iron ions, FeO, and metallic iron [36,37]. This is mostly due to the operating conditions of the melter, where a liquid pool of pig iron metal forms at the bottom as the carbon content in the pig iron (around 3.40 wt.% [38])…”

Section: Chemical Considerationsmentioning

confidence: 99%

Implications of Direct Use of Slag from Ironmaking Processes as Molten Oxide Electrolyte

Treceño

Allanore

Bishop

et al. 2021

JOM

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The thermochemical and electrical behaviour of ironmaking slag produced from titanomagnetite concentrates was assessed in the vicinity of its tapping temperature. A combination of electrochemical measurements in a modified thermal imaging furnace and computational thermodynamic calculations was employed to elucidate its potential use as a molten oxide electrolyte for the extraction of high-purity metal. The results show that the presence of entrained iron species in the ironmaking slag decreases the faradaic efficiency of the electrolysis. Thermodynamic predictions reveal a small electrochemical window of operation between the decomposition of silica and titania, which might result in the co-reduction of titanium and silicon ions from the melt. Practical considerations for the electrochemical production of metal directly from the ironmaking process are discussed, and further experimental investigation of the electrochemical behaviour of this material is justified.

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Oxidation Kinetics and Oxygen Capacity of Ti-Bearing Blast Furnace Slag under Dynamic Oxidation Conditions

Cited by 14 publications

References 13 publications

Experimental Study on the Phase Relations of the SiO2-MgO-TiO2 System in Air at 1500°C

Experimental Study on the Phase Relations of the SiO2-MgO-TiO2 System in Air at 1500°C

Effect of Oxidation Temperature on the Oxidation Process of Silicon-Containing Steel

Implications of Direct Use of Slag from Ironmaking Processes as Molten Oxide Electrolyte

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