Effect of Silica on Reduction of Calcium Ferrite with CO–N&lt;sub&gt;2&lt;/sub&gt; Gas Mixtures

Ding, Chengyi; Lv, Xuewei; Xuan, Senwei; Qiu, Jie; Chen, Yun; Bai, Chenguang

doi:10.2355/isijinternational.isijint-2016-441

Cited by 15 publications

(10 citation statements)

References 22 publications

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“…The effect of silica on the reduction of ternary calcium ferrite system was studied previously . Maximum reduction degree (MRD) and its corresponding average RR (min −1 ) for each sample are shown in Table , where RR was defined as MRD divided by reduction time.…”

Section: Resultsmentioning

confidence: 99%

“…The present study is the second part of a series of studies that focuses on the influence of the addition of gangue components, such as silica and alumina, to CF on reduction behavior. It follows the previous work on silica and aims at better understanding the influence of different alumina content on the reaction mechanism of the CaO–Fe 2 O 3 (0, 2, 4, and 8 wt%)–Al 2 O 3 system. The isothermal kinetics of CaO–Fe 2 O 3 –Al 2 O 3 in 30% CO and 70% N 2 gas mixture was studied by using thermogravimetric analysis (TGA).…”

Section: Introductionmentioning

confidence: 99%

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Reduction Behavior of Aluminate Calcium Ferrite (CFA) in CO‐N₂ Atmosphere

Xuan

Ding

et al. 2018

steel research int.

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Calcium ferrite (CF) is the significant liquid phase for fluxed sinters, which are the main iron‐bearing materials charged into a blast furnace. The isothermal reduction kinetics of CaO–Fe2O3 (0, 2, 4, and 8 wt%)–Al2O3 (CF, CF2A, CF4A, and CF8A) by CO at 1073, 1123, 1173, and 1223 K are investigated by thermogravimetric analysis in this study. Results indicate that temperature exerts more influence on the reduction degree of ternary CaO–Fe2O3–Al2O3 system than alumina content. The reduction processes of CF, CF2A, CF4A, and CF8A are mainly expressed as a typical two‐stage reaction. The apparent activation energies of the reduction of CF, CF2A, CF4A, and CF8A are 43.6, 97.9, 87.7, and 82.9 kJ mol−1, respectively, based on the model‐free method. According to Sharp analysis, the reduction of CF is described by the Avrami‐Erofeev equation with 2D reaction, that of CF2A and CF4A is expressed initially with 2D reaction and then by the 2D phase boundary controlled reaction, and that of CF8A is controlled by 3D reaction.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reduction Behavior of Aluminate Calcium Ferrite (CFA) in CO‐N₂ Atmosphere

Xuan

Ding

et al. 2018

steel research int.

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“…Although the reduction processes of VTM sinter 3,39 and CFs 40,41 have been extensively reported, the reduction behavior of AT has rarely been investigated. In this study, the non-isothermal reduction behavior of AT was examined by thermal analysis using a Setaram analyzer 40 (Model Setsys Evo TG-DTA 1750).…”

Section: Reduction Performancementioning

confidence: 99%

Andradite titanium: Preparation, characterization and metallurgical performance

Chen

You

et al. 2021

J Am Ceram Soc.

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Andradite titanium (Ca 3 Fe 2 Si 1.58 Ti 1.42 O 12 , abbreviated as AT), which is a significant mineral phase in the sinter of titanium-containing iron ore, was prepared via a solid-state reaction with analytical reagents. The crystal structure, cold strength, and high-temperature heat capacity were individually characterized, and the metallurgical performance, such as melting and reduction behavior, were measured. AT is a variant of andradite (Ca 3 Fe 2 Si 3 O 12 ) formed by the Ti 4+ substitution for Fe 3+ in the octahedral sites and Fe 3+ substitution for Si 4+ in the tetrahedral sites. The compressive strength of AT was approximately 14.21 MPa, and its softening, melting, and flowing temperatures were 1453, 1483, and 1509 K, respectively. According to the differential scanning calorimetry measurements, the melting point was approximately 1502 K. The non-isothermal reduction results revealed that AT was reduced to Fe, perovskite, and wollastonite in a single step, and the isothermal reduction test indicated that the reduction degree of AT was only 0.67 when reduced at 900 • C for 150 min, and the order of reduction performance was FeThe hightemperature heat capacity of AT as a function of temperature was also measured and modeled.

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“…Moreover, the reduction behavior of calcium ferrite minerals under CO and H 2 were also investigated. [7][8][9][10][11][12] In addition, in recent research, it has been widely applied including as a thermal catalyst for decreasing the NOx emission in the sintering process, [13][14][15] as a photocatalytic for degradation of the organic wastewater 16,17) and volatile organic compounds, [18][19][20] as a photocathode for producing hydrogen in water splitting, [21][22][23] as a oxygen carrier for chemical looping gasification applications, [24][25][26][27][28] as a anode material for lithiumion batteries 29) and as a visible light activated gas sensor. 30) The surface structure of calcium ferrite affects the strength of sinter and reduction reaction of it with CO and H 2 in the blast furnace.…”

Section: Introductionmentioning

confidence: 99%

Surface Structures of CaFe<sub>2</sub>O<sub>4</sub> (001), (100), (110) and (111): A Density Functional Theory Study

Que

2021

ISIJ Int.

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Effect of Silica on Reduction of Calcium Ferrite with CO–N<sub>2</sub> Gas Mixtures

Cited by 15 publications

References 22 publications

Reduction Behavior of Aluminate Calcium Ferrite (CFA) in CO‐N₂ Atmosphere

Reduction Behavior of Aluminate Calcium Ferrite (CFA) in CO‐N₂ Atmosphere

Andradite titanium: Preparation, characterization and metallurgical performance

Surface Structures of CaFe<sub>2</sub>O<sub>4</sub> (001), (100), (110) and (111): A Density Functional Theory Study

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Effect of Silica on Reduction of Calcium Ferrite with CO–N<sub>2</sub> Gas Mixtures

Cited by 15 publications

References 22 publications

Reduction Behavior of Aluminate Calcium Ferrite (CFA) in CO‐N2 Atmosphere

Reduction Behavior of Aluminate Calcium Ferrite (CFA) in CO‐N2 Atmosphere

Andradite titanium: Preparation, characterization and metallurgical performance

Surface Structures of CaFe<sub>2</sub>O<sub>4</sub> (001), (100), (110) and (111): A Density Functional Theory Study

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Product

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Reduction Behavior of Aluminate Calcium Ferrite (CFA) in CO‐N₂ Atmosphere

Reduction Behavior of Aluminate Calcium Ferrite (CFA) in CO‐N₂ Atmosphere