Simulation study on the quenching characteristics of molten steel slag under different quenching media and modes
China's water-quenched steel slag is largely landfilled due to low utilization, and slag gas quenching, despite being eco-friendly and water-efficient, faces challenges such as high energy consumption, low value-added output, along with safety risks arising from thermal and compositional limita...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-08-01
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| Series: | Case Studies in Thermal Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X25005763 |
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| author | Jiahao Zhang Jingcai Chang Qinglei Liu Zongqiang Li Taiyang Liu Chunyan Xu Peng Wang Hongfei Wu |
| author_facet | Jiahao Zhang Jingcai Chang Qinglei Liu Zongqiang Li Taiyang Liu Chunyan Xu Peng Wang Hongfei Wu |
| author_sort | Jiahao Zhang |
| collection | DOAJ |
| description | China's water-quenched steel slag is largely landfilled due to low utilization, and slag gas quenching, despite being eco-friendly and water-efficient, faces challenges such as high energy consumption, low value-added output, along with safety risks arising from thermal and compositional limitations, it is therefore imperative to develop advanced quenching media and processes. To address this, this study proposes a convenient, cost-effective quenching method utilizing CO2-rich gas and slag as raw materials. Results show that the complete solidification time in the new mixture medium is nearly halved compared to that in the air medium. Furthermore, the two mediums exhibit distinct solid-liquid interface dynamics: in air, the slag's interface propagates inward from the exterior, whereas bidirectional propagation occurs simultaneously at a significantly faster rate in the new medium. In quenching features sense, a faster cooling rate and a hundred milliseconds duration effectively inhibit the decomposition of C3S and β-C2S to γ-C2S phase change. In ensuring security sense, the time required for the semi-solidification of new mixture media with a gas temperature of 1000 K is less than that for air with a temperature of 400 K. In the carbon fixation sense, the CO2-rich gas quenching process promotes reaction kinetics of carbonation and has a positive effect on eliminating remaining f-CaO and f-MgO. This approach has great potential to scale up, and points out the direction for sustainably converting waste steel slag into high-quality active admixture combined with substantial heat recovery. |
| format | Article |
| id | doaj-art-ff5fb9f3ab0147cf94658f27dd35e875 |
| institution | OA Journals |
| issn | 2214-157X |
| language | English |
| publishDate | 2025-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj-art-ff5fb9f3ab0147cf94658f27dd35e8752025-08-20T01:55:21ZengElsevierCase Studies in Thermal Engineering2214-157X2025-08-017210631610.1016/j.csite.2025.106316Simulation study on the quenching characteristics of molten steel slag under different quenching media and modesJiahao Zhang0Jingcai Chang1Qinglei Liu2Zongqiang Li3Taiyang Liu4Chunyan Xu5Peng Wang6Hongfei Wu7School of Environmental Science and Engineering, Shandong University, Qingdao, 266237, Shandong, China; School of Industrial Technology Research Institute, Shandong University, Weihai, 264209, ChinaSchool of Environmental Science and Engineering, Shandong University, Qingdao, 266237, Shandong, China; School of Industrial Technology Research Institute, Shandong University, Weihai, 264209, China; Corresponding author. School of Environmental Science and Engineering, Shandong University, Qingdao, 266237, Shandong, China.Qingda Low Carbon Green Hydrogen Industrial Technology Research Institute (Qingdao) Co., LTD, Qingdao, ChinaNational Energy (Shandong) Energy Environment Co., LTD, Jinan, 250000, Shandong, ChinaSchool of Environmental Science and Engineering, Shandong University, Qingdao, 266237, Shandong, ChinaSchool of Materials and Environment, Guangxi Minzu University, Nanning, 530006, Guangxi, ChinaSchool of Nuclear Science, Eenrgy and Power Engineering, Shandong University, Jinan, 250100, Shandong, China; Corresponding author.School of Environmental Science and Engineering, Shandong University, Qingdao, 266237, Shandong, ChinaChina's water-quenched steel slag is largely landfilled due to low utilization, and slag gas quenching, despite being eco-friendly and water-efficient, faces challenges such as high energy consumption, low value-added output, along with safety risks arising from thermal and compositional limitations, it is therefore imperative to develop advanced quenching media and processes. To address this, this study proposes a convenient, cost-effective quenching method utilizing CO2-rich gas and slag as raw materials. Results show that the complete solidification time in the new mixture medium is nearly halved compared to that in the air medium. Furthermore, the two mediums exhibit distinct solid-liquid interface dynamics: in air, the slag's interface propagates inward from the exterior, whereas bidirectional propagation occurs simultaneously at a significantly faster rate in the new medium. In quenching features sense, a faster cooling rate and a hundred milliseconds duration effectively inhibit the decomposition of C3S and β-C2S to γ-C2S phase change. In ensuring security sense, the time required for the semi-solidification of new mixture media with a gas temperature of 1000 K is less than that for air with a temperature of 400 K. In the carbon fixation sense, the CO2-rich gas quenching process promotes reaction kinetics of carbonation and has a positive effect on eliminating remaining f-CaO and f-MgO. This approach has great potential to scale up, and points out the direction for sustainably converting waste steel slag into high-quality active admixture combined with substantial heat recovery.http://www.sciencedirect.com/science/article/pii/S2214157X25005763Molten steel slagCO2-Rich gas carrying slagQuenchingSimulation |
| spellingShingle | Jiahao Zhang Jingcai Chang Qinglei Liu Zongqiang Li Taiyang Liu Chunyan Xu Peng Wang Hongfei Wu Simulation study on the quenching characteristics of molten steel slag under different quenching media and modes Case Studies in Thermal Engineering Molten steel slag CO2-Rich gas carrying slag Quenching Simulation |
| title | Simulation study on the quenching characteristics of molten steel slag under different quenching media and modes |
| title_full | Simulation study on the quenching characteristics of molten steel slag under different quenching media and modes |
| title_fullStr | Simulation study on the quenching characteristics of molten steel slag under different quenching media and modes |
| title_full_unstemmed | Simulation study on the quenching characteristics of molten steel slag under different quenching media and modes |
| title_short | Simulation study on the quenching characteristics of molten steel slag under different quenching media and modes |
| title_sort | simulation study on the quenching characteristics of molten steel slag under different quenching media and modes |
| topic | Molten steel slag CO2-Rich gas carrying slag Quenching Simulation |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X25005763 |
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