Comparative Study on the Kinetics of the Isothermal Reduction of Iron Ore Composite Pellets Using Coke, Charcoal, and Biomass as Reducing Agents
The kinetics of the isothermal reduction of iron ore–coke, iron ore–charcoal, and iron ore–biomass (straw) composite pellets were studied at 900–1200 °C. Compared with the other two composite pellets, the composite pellet using biomass as a reducing agent showed a more rapid reduction rate at a rela...
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MDPI AG
2021-02-01
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| Online Access: | https://www.mdpi.com/2075-4701/11/2/340 |
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| author | Xiaoli Yuan Fuming Luo Shifeng Liu Mingyuan Zhang Dongshan Zhou |
| author_facet | Xiaoli Yuan Fuming Luo Shifeng Liu Mingyuan Zhang Dongshan Zhou |
| author_sort | Xiaoli Yuan |
| collection | DOAJ |
| description | The kinetics of the isothermal reduction of iron ore–coke, iron ore–charcoal, and iron ore–biomass (straw) composite pellets were studied at 900–1200 °C. Compared with the other two composite pellets, the composite pellet using biomass as a reducing agent showed a more rapid reduction rate at a relatively low temperature. With an increase in the temperature, the reduction rates of the three different composite pellets tended to be equal. The reducing reactions of the three different composite pellets were all mainly controlled by gasification diffusion. The reduction rates can be described by the interface reaction kinetic model (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mrow><mo stretchy="false">[</mo><mn>1</mn><mo>−</mo><msup><mrow><mo stretchy="false">(</mo><mn>1</mn><mo>−</mo><mi>m</mi><mo stretchy="false">)</mo></mrow><mrow><mn>1</mn><mo>/</mo><mn>3</mn></mrow></msup><mo stretchy="false">]</mo></mrow><mn>2</mn></msup><mo>=</mo><mi>k</mi><mi>t</mi></mrow></semantics></math></inline-formula>). The apparent activation energies of the gasification diffusion of coke, charcoal, and biomass composite pellets at 900–1200 °C were calculated using the Arrhenius equation, and they were 95.81, 71.67, and 58.69 kJ/mol, respectively. The biomass composite pellets exhibited a lower apparent activation energy than the composite pellets with other reduction agents. |
| first_indexed | 2024-03-09T00:46:10Z |
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| last_indexed | 2024-03-09T00:46:10Z |
| publishDate | 2021-02-01 |
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| series | Metals |
| spelling | doaj.art-f0c50ef0068340ae948dc7b3752f64ab2023-12-11T17:31:08ZengMDPI AGMetals2075-47012021-02-0111234010.3390/met11020340Comparative Study on the Kinetics of the Isothermal Reduction of Iron Ore Composite Pellets Using Coke, Charcoal, and Biomass as Reducing AgentsXiaoli Yuan0Fuming Luo1Shifeng Liu2Mingyuan Zhang3Dongshan Zhou4School of Metallurgy and Material Engineering, Chongqing University of Science and Technology, Chongqing 401331, ChinaSchool of Metallurgy and Material Engineering, Chongqing University of Science and Technology, Chongqing 401331, ChinaCollege of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaSchool of Metallurgy and Material Engineering, Chongqing University of Science and Technology, Chongqing 401331, ChinaSchool of Metallurgy and Material Engineering, Chongqing University of Science and Technology, Chongqing 401331, ChinaThe kinetics of the isothermal reduction of iron ore–coke, iron ore–charcoal, and iron ore–biomass (straw) composite pellets were studied at 900–1200 °C. Compared with the other two composite pellets, the composite pellet using biomass as a reducing agent showed a more rapid reduction rate at a relatively low temperature. With an increase in the temperature, the reduction rates of the three different composite pellets tended to be equal. The reducing reactions of the three different composite pellets were all mainly controlled by gasification diffusion. The reduction rates can be described by the interface reaction kinetic model (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mrow><mo stretchy="false">[</mo><mn>1</mn><mo>−</mo><msup><mrow><mo stretchy="false">(</mo><mn>1</mn><mo>−</mo><mi>m</mi><mo stretchy="false">)</mo></mrow><mrow><mn>1</mn><mo>/</mo><mn>3</mn></mrow></msup><mo stretchy="false">]</mo></mrow><mn>2</mn></msup><mo>=</mo><mi>k</mi><mi>t</mi></mrow></semantics></math></inline-formula>). The apparent activation energies of the gasification diffusion of coke, charcoal, and biomass composite pellets at 900–1200 °C were calculated using the Arrhenius equation, and they were 95.81, 71.67, and 58.69 kJ/mol, respectively. The biomass composite pellets exhibited a lower apparent activation energy than the composite pellets with other reduction agents.https://www.mdpi.com/2075-4701/11/2/340composite pelletsbiomassisothermal reductionkineticsactivation energy |
| spellingShingle | Xiaoli Yuan Fuming Luo Shifeng Liu Mingyuan Zhang Dongshan Zhou Comparative Study on the Kinetics of the Isothermal Reduction of Iron Ore Composite Pellets Using Coke, Charcoal, and Biomass as Reducing Agents Metals composite pellets biomass isothermal reduction kinetics activation energy |
| title | Comparative Study on the Kinetics of the Isothermal Reduction of Iron Ore Composite Pellets Using Coke, Charcoal, and Biomass as Reducing Agents |
| title_full | Comparative Study on the Kinetics of the Isothermal Reduction of Iron Ore Composite Pellets Using Coke, Charcoal, and Biomass as Reducing Agents |
| title_fullStr | Comparative Study on the Kinetics of the Isothermal Reduction of Iron Ore Composite Pellets Using Coke, Charcoal, and Biomass as Reducing Agents |
| title_full_unstemmed | Comparative Study on the Kinetics of the Isothermal Reduction of Iron Ore Composite Pellets Using Coke, Charcoal, and Biomass as Reducing Agents |
| title_short | Comparative Study on the Kinetics of the Isothermal Reduction of Iron Ore Composite Pellets Using Coke, Charcoal, and Biomass as Reducing Agents |
| title_sort | comparative study on the kinetics of the isothermal reduction of iron ore composite pellets using coke charcoal and biomass as reducing agents |
| topic | composite pellets biomass isothermal reduction kinetics activation energy |
| url | https://www.mdpi.com/2075-4701/11/2/340 |
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