Kinetic Analysis of Isothermal and Non-Isothermal Reduction of Iron Ore Fines in Hydrogen Atmosphere
Direct reduction of iron ore with H<sub>2</sub> has become an alternative technology for iron production that reduces pollutant emissions. The reduction kinetics of iron ore fines in an H<sub>2</sub> atmosphere under isothermal and non-isothermal conditions were studied by th...
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MDPI AG
2022-10-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/12/10/1754 |
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| author | Binbin Lyu Guang Wang Fan Yang Haibin Zuo Qingguo Xue Jingsong Wang |
| author_facet | Binbin Lyu Guang Wang Fan Yang Haibin Zuo Qingguo Xue Jingsong Wang |
| author_sort | Binbin Lyu |
| collection | DOAJ |
| description | Direct reduction of iron ore with H<sub>2</sub> has become an alternative technology for iron production that reduces pollutant emissions. The reduction kinetics of iron ore fines in an H<sub>2</sub> atmosphere under isothermal and non-isothermal conditions were studied by thermogravimetric analysis. X-ray diffraction and scanning electron microscopy were used to measure the mineral composition and analyse the morphology of the reduced fines, respectively. In the isothermal reduction experiment, it was found that the final reduction time was shorter, the higher the temperature, and the metallic iron particles formed a dense matrix structure. It is likely that the initial stages reduction process is the result of a combination of gaseous diffusion and interfacial chemical reaction mechanisms, and that the later stages a combination of interfacial chemical reaction and solid diffusion is the rate control mechanism. In the non-isothermal experiment, the heating rate had a significant effect on the reaction rate. The results show that the non-isothermal reduction proceeded through three stages: mixing control model, two-dimensional diffusion, and three-dimensional diffusion. |
| first_indexed | 2024-03-09T19:47:35Z |
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| language | English |
| last_indexed | 2024-03-09T19:47:35Z |
| publishDate | 2022-10-01 |
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| spelling | doaj.art-b73dca6fef114163a2cb2aeb8e3512c42023-11-24T01:20:13ZengMDPI AGMetals2075-47012022-10-011210175410.3390/met12101754Kinetic Analysis of Isothermal and Non-Isothermal Reduction of Iron Ore Fines in Hydrogen AtmosphereBinbin Lyu0Guang Wang1Fan Yang2Haibin Zuo3Qingguo Xue4Jingsong Wang5State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, ChinaState Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, ChinaState Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, ChinaState Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, ChinaState Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, ChinaState Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, ChinaDirect reduction of iron ore with H<sub>2</sub> has become an alternative technology for iron production that reduces pollutant emissions. The reduction kinetics of iron ore fines in an H<sub>2</sub> atmosphere under isothermal and non-isothermal conditions were studied by thermogravimetric analysis. X-ray diffraction and scanning electron microscopy were used to measure the mineral composition and analyse the morphology of the reduced fines, respectively. In the isothermal reduction experiment, it was found that the final reduction time was shorter, the higher the temperature, and the metallic iron particles formed a dense matrix structure. It is likely that the initial stages reduction process is the result of a combination of gaseous diffusion and interfacial chemical reaction mechanisms, and that the later stages a combination of interfacial chemical reaction and solid diffusion is the rate control mechanism. In the non-isothermal experiment, the heating rate had a significant effect on the reaction rate. The results show that the non-isothermal reduction proceeded through three stages: mixing control model, two-dimensional diffusion, and three-dimensional diffusion.https://www.mdpi.com/2075-4701/12/10/1754hydrogen gasisothermal reductionnon-isothermal reductionactivation energykinetics mechanism |
| spellingShingle | Binbin Lyu Guang Wang Fan Yang Haibin Zuo Qingguo Xue Jingsong Wang Kinetic Analysis of Isothermal and Non-Isothermal Reduction of Iron Ore Fines in Hydrogen Atmosphere Metals hydrogen gas isothermal reduction non-isothermal reduction activation energy kinetics mechanism |
| title | Kinetic Analysis of Isothermal and Non-Isothermal Reduction of Iron Ore Fines in Hydrogen Atmosphere |
| title_full | Kinetic Analysis of Isothermal and Non-Isothermal Reduction of Iron Ore Fines in Hydrogen Atmosphere |
| title_fullStr | Kinetic Analysis of Isothermal and Non-Isothermal Reduction of Iron Ore Fines in Hydrogen Atmosphere |
| title_full_unstemmed | Kinetic Analysis of Isothermal and Non-Isothermal Reduction of Iron Ore Fines in Hydrogen Atmosphere |
| title_short | Kinetic Analysis of Isothermal and Non-Isothermal Reduction of Iron Ore Fines in Hydrogen Atmosphere |
| title_sort | kinetic analysis of isothermal and non isothermal reduction of iron ore fines in hydrogen atmosphere |
| topic | hydrogen gas isothermal reduction non-isothermal reduction activation energy kinetics mechanism |
| url | https://www.mdpi.com/2075-4701/12/10/1754 |
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