Study on Slag Forming Route of Dephosphorization in Combined Blown Converter
In order to achieve the purpose of high-efficiency dephosphorization by single-slag method during the combined blown converter steelmaking process, the CaO-SiO<sub>2</sub>-Fe<i><sub>t</sub></i>O-MgO-MnO-P<sub>2</sub>O<sub>5</sub> slag syste...
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MDPI AG
2021-07-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/8/1160 |
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| author | Bin Zhu Mingmei Zhu Jie Luo Xin Qiu Yu Wang Quanxin Zhang Rongzhi Li Bing Xie |
| author_facet | Bin Zhu Mingmei Zhu Jie Luo Xin Qiu Yu Wang Quanxin Zhang Rongzhi Li Bing Xie |
| author_sort | Bin Zhu |
| collection | DOAJ |
| description | In order to achieve the purpose of high-efficiency dephosphorization by single-slag method during the combined blown converter steelmaking process, the CaO-SiO<sub>2</sub>-Fe<i><sub>t</sub></i>O-MgO-MnO-P<sub>2</sub>O<sub>5</sub> slag system was taken as the research object, and the slag-forming route of dephosphorization was studied. The effects of slag compositions on the liquidus and the contour map of phosphorus distribution ratios (recorded as <i>L<sub>p</sub></i>) were calculated by thermodynamics software FactSage, and then the theoretic slag-forming route of dephosphorization was obtained. The effects of slag compositions on dephosphorization rate and <i>L<sub>p</sub></i> were studied by a high-temperature experiment. Based on the results of the theoretic calculation and high-temperature experiment, the actual slag-forming route of dephosphorization by the single-slag process in the combined blown converter was obtained: The initial slag composition should be around 15.0%CaO-44.0%SiO<sub>2</sub>-41.0%Fe<i><sub>t</sub></i>O. The composition of high-efficiency dephosphorization slag should be around 50.8%CaO-24.2%SiO<sub>2</sub>-25%Fe<i><sub>t</sub></i>O. The final slag composition should be around 65.6%CaO-28.3%SiO<sub>2</sub>-6.1%Fe<i><sub>t</sub></i>O. After using the actual slag-forming route in the production, the dephosphorization rate was increased by 3.6%, and the consumption of slagging materials was reduced by 3.78 kg/t. |
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| language | English |
| last_indexed | 2024-03-10T08:36:17Z |
| publishDate | 2021-07-01 |
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| series | Metals |
| spelling | doaj.art-8ba44346c829488abed8e94fc3d18e632023-11-22T08:40:19ZengMDPI AGMetals2075-47012021-07-01118116010.3390/met11081160Study on Slag Forming Route of Dephosphorization in Combined Blown ConverterBin Zhu0Mingmei Zhu1Jie Luo2Xin Qiu3Yu Wang4Quanxin Zhang5Rongzhi Li6Bing Xie7College of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaCollege of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaCollege of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaCollege of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaCollege of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaChongqing Iron and Steel Research Institute Co. Ltd., Chongqing 400084, ChinaChongqing Iron and Steel Research Institute Co. Ltd., Chongqing 400084, ChinaCollege of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaIn order to achieve the purpose of high-efficiency dephosphorization by single-slag method during the combined blown converter steelmaking process, the CaO-SiO<sub>2</sub>-Fe<i><sub>t</sub></i>O-MgO-MnO-P<sub>2</sub>O<sub>5</sub> slag system was taken as the research object, and the slag-forming route of dephosphorization was studied. The effects of slag compositions on the liquidus and the contour map of phosphorus distribution ratios (recorded as <i>L<sub>p</sub></i>) were calculated by thermodynamics software FactSage, and then the theoretic slag-forming route of dephosphorization was obtained. The effects of slag compositions on dephosphorization rate and <i>L<sub>p</sub></i> were studied by a high-temperature experiment. Based on the results of the theoretic calculation and high-temperature experiment, the actual slag-forming route of dephosphorization by the single-slag process in the combined blown converter was obtained: The initial slag composition should be around 15.0%CaO-44.0%SiO<sub>2</sub>-41.0%Fe<i><sub>t</sub></i>O. The composition of high-efficiency dephosphorization slag should be around 50.8%CaO-24.2%SiO<sub>2</sub>-25%Fe<i><sub>t</sub></i>O. The final slag composition should be around 65.6%CaO-28.3%SiO<sub>2</sub>-6.1%Fe<i><sub>t</sub></i>O. After using the actual slag-forming route in the production, the dephosphorization rate was increased by 3.6%, and the consumption of slagging materials was reduced by 3.78 kg/t.https://www.mdpi.com/2075-4701/11/8/1160dephosphorizationslag-forming routeCaO-SiO<sub>2</sub>-Fe<i><sub>t</sub></i>O-MgO-MnO-P<sub>2</sub>O<sub>5</sub> slag systemthermodynamic calculationsingle-slag process |
| spellingShingle | Bin Zhu Mingmei Zhu Jie Luo Xin Qiu Yu Wang Quanxin Zhang Rongzhi Li Bing Xie Study on Slag Forming Route of Dephosphorization in Combined Blown Converter Metals dephosphorization slag-forming route CaO-SiO<sub>2</sub>-Fe<i><sub>t</sub></i>O-MgO-MnO-P<sub>2</sub>O<sub>5</sub> slag system thermodynamic calculation single-slag process |
| title | Study on Slag Forming Route of Dephosphorization in Combined Blown Converter |
| title_full | Study on Slag Forming Route of Dephosphorization in Combined Blown Converter |
| title_fullStr | Study on Slag Forming Route of Dephosphorization in Combined Blown Converter |
| title_full_unstemmed | Study on Slag Forming Route of Dephosphorization in Combined Blown Converter |
| title_short | Study on Slag Forming Route of Dephosphorization in Combined Blown Converter |
| title_sort | study on slag forming route of dephosphorization in combined blown converter |
| topic | dephosphorization slag-forming route CaO-SiO<sub>2</sub>-Fe<i><sub>t</sub></i>O-MgO-MnO-P<sub>2</sub>O<sub>5</sub> slag system thermodynamic calculation single-slag process |
| url | https://www.mdpi.com/2075-4701/11/8/1160 |
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