Development of Solid Waste-Based Composite Calcium Ferrite Flux and Its Application in Hot Metal Pre-Dephosphorization
To enhance the slagging efficiency of the lime-based slag system during the pre-treatment stage of hot metal, a composite calcium ferrite flux based on aluminum industry solid waste was developed in this study. The melting characteristics of the flux and its application in the pre-treatment of hot m...
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2024-02-01
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| Online Access: | https://www.mdpi.com/1996-1944/17/5/992 |
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| author | Zheng Zhao Xiaoming Feng Yanling Zhang Yao Zhang Yaoting Wu |
| author_facet | Zheng Zhao Xiaoming Feng Yanling Zhang Yao Zhang Yaoting Wu |
| author_sort | Zheng Zhao |
| collection | DOAJ |
| description | To enhance the slagging efficiency of the lime-based slag system during the pre-treatment stage of hot metal, a composite calcium ferrite flux based on aluminum industry solid waste was developed in this study. The melting characteristics of the flux and its application in the pre-treatment of hot metal were investigated. The results indicated that the main phases of the composite calcium ferrite were CaFe<sub>2</sub>O<sub>4</sub>, Ca<sub>2</sub>Fe<sub>2</sub>O<sub>5</sub>, and Ca<sub>2</sub>(Fe,Al)<sub>2</sub>O<sub>4</sub>. It exhibited high oxidation, high alkalinity, and a low melting point, thereby achieving excellent melting performance. Simulations of various dephosphorization fluxes in the pre-treatment of high-phosphorus hot metal, ordinary hot metal, and kilogram-scale dephosphorization experiment processes were conducted. Under the same experimental conditions, the composite calcium ferrite flux was able to achieve a dephosphorization rate of over 90% and a final phosphorus content of less than 0.02 wt% under high carbon content ([%C] = 3.2 wt%). In the application of hot metal pre-dephosphorization, this flux was able to achieve efficient melting and rapid slagging of lime at a lower temperature, and its slagging time was 50% faster than that of calcium ferrite flux. In addition, this flux enhanced the utilization efficiency of lime during the steelmaking process, effectively prevented the agglomeration of slag, and achieved efficient slag–metal separation. These characteristics were significantly better than the application effect of calcium ferrite flux. This flux has significant implications for the industrial application of deep dephosphorization in the pre-treatment stage of hot metal or the early stage of converter steelmaking. |
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| institution | Directory Open Access Journal |
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| language | English |
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| spelling | doaj.art-90348efa917a452cac11333d2757cf212024-03-12T16:48:51ZengMDPI AGMaterials1996-19442024-02-0117599210.3390/ma17050992Development of Solid Waste-Based Composite Calcium Ferrite Flux and Its Application in Hot Metal Pre-DephosphorizationZheng Zhao0Xiaoming Feng1Yanling Zhang2Yao Zhang3Yaoting Wu4State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, ChinaJianlong Steel Holdings Co., Ltd., Beijing 100070, 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, ChinaTo enhance the slagging efficiency of the lime-based slag system during the pre-treatment stage of hot metal, a composite calcium ferrite flux based on aluminum industry solid waste was developed in this study. The melting characteristics of the flux and its application in the pre-treatment of hot metal were investigated. The results indicated that the main phases of the composite calcium ferrite were CaFe<sub>2</sub>O<sub>4</sub>, Ca<sub>2</sub>Fe<sub>2</sub>O<sub>5</sub>, and Ca<sub>2</sub>(Fe,Al)<sub>2</sub>O<sub>4</sub>. It exhibited high oxidation, high alkalinity, and a low melting point, thereby achieving excellent melting performance. Simulations of various dephosphorization fluxes in the pre-treatment of high-phosphorus hot metal, ordinary hot metal, and kilogram-scale dephosphorization experiment processes were conducted. Under the same experimental conditions, the composite calcium ferrite flux was able to achieve a dephosphorization rate of over 90% and a final phosphorus content of less than 0.02 wt% under high carbon content ([%C] = 3.2 wt%). In the application of hot metal pre-dephosphorization, this flux was able to achieve efficient melting and rapid slagging of lime at a lower temperature, and its slagging time was 50% faster than that of calcium ferrite flux. In addition, this flux enhanced the utilization efficiency of lime during the steelmaking process, effectively prevented the agglomeration of slag, and achieved efficient slag–metal separation. These characteristics were significantly better than the application effect of calcium ferrite flux. This flux has significant implications for the industrial application of deep dephosphorization in the pre-treatment stage of hot metal or the early stage of converter steelmaking.https://www.mdpi.com/1996-1944/17/5/992compound calcium ferrite fluxmelting propertieshot metal pre-treatmentdephosphorizationsolid waste disposal |
| spellingShingle | Zheng Zhao Xiaoming Feng Yanling Zhang Yao Zhang Yaoting Wu Development of Solid Waste-Based Composite Calcium Ferrite Flux and Its Application in Hot Metal Pre-Dephosphorization Materials compound calcium ferrite flux melting properties hot metal pre-treatment dephosphorization solid waste disposal |
| title | Development of Solid Waste-Based Composite Calcium Ferrite Flux and Its Application in Hot Metal Pre-Dephosphorization |
| title_full | Development of Solid Waste-Based Composite Calcium Ferrite Flux and Its Application in Hot Metal Pre-Dephosphorization |
| title_fullStr | Development of Solid Waste-Based Composite Calcium Ferrite Flux and Its Application in Hot Metal Pre-Dephosphorization |
| title_full_unstemmed | Development of Solid Waste-Based Composite Calcium Ferrite Flux and Its Application in Hot Metal Pre-Dephosphorization |
| title_short | Development of Solid Waste-Based Composite Calcium Ferrite Flux and Its Application in Hot Metal Pre-Dephosphorization |
| title_sort | development of solid waste based composite calcium ferrite flux and its application in hot metal pre dephosphorization |
| topic | compound calcium ferrite flux melting properties hot metal pre-treatment dephosphorization solid waste disposal |
| url | https://www.mdpi.com/1996-1944/17/5/992 |
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