Evolution of Interface Characteristic between Quicklime and CaO–SiO2–FetO–MgO Melt during Slag‐Forming Procedure in Converter under Different Times
Evolution of Interface Characteristic between Quicklime and CaO–SiO2–FetO–MgO Melt during Slag‐Forming Procedure in Converter under Different Times
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DOI：
10.1002/srin.202300183
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发表时间：
2023-07
影响因子：
2.2
通讯作者：
Mengxu Zhang;Jianli Li;Cao Jia;Yueling Yu;X. Xie
中科院分区：
文献类型：
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作者：
Mengxu Zhang;Jianli Li;Cao Jia;Yueling Yu;X. Xie
2022年，我国粗钢产量为10. 18亿吨，钢渣占产量的10-15%。钢渣中10- 20% f-CaO的存在，造成体积不稳定，阻碍了综合利用。f-CaO的生成与转炉造渣过程中生石灰的溶解密切相关。本研究利用电子探针显微分析仪和ImageJ图像分析仪研究了不同炉渣条件下石灰-炉渣界面的演化和石灰溶解速率的变化。结果表明，在1400 °C下形成CaO-FeO固溶体、（Ca，Mg，Fe）橄榄石和低熔点（Ca，Mg）橄榄石。随着FeO含量的减少，形成致密且高熔点的2CaO·SiO2层。当溶解时间为180 s时，2CaO·SiO2层的厚度最大。此外，石灰在不同炉渣中的平均溶解速率呈现先增大后减小的趋势。在所研究的渣中，渣A3的平均溶解速率最高，为2.24 × 10 - 6 m s-1，而渣A4的平均溶解速率最低，为1.49 × 10 - 6 m s-1。2CaO·SiO2层的存在阻碍了传质，从而进一步抑制了反应。
In 2022, China produced 1.018 billion tons of crude steel, with steel slag accounting for 10–15% of the output. The presence of 10–20% f‐CaO in steel slag causes volume instability, hindering comprehensive utilization. The generation of f‐CaO is closely associated with the dissolution of quicklime during the converter slag‐forming procedure. This study focuses on investigating the evolution of the lime–slag interface and the variations in lime dissolution rate under different slag conditions using the electron probe microanalyzer and ImageJ. The results reveal that the formation of the CaO–FeO solid solution, (Ca, Mg, Fe) olivine, and low‐melting point (Ca, Mg) olivine at 1400 °C. As the FeO content decreases, a dense and high‐melting‐point 2CaO·SiO2 layer is formed. A maximum thickness of the 2CaO·SiO2 layer is precipitated at a dissolution time of 180 s. Additionally, the average dissolution rate of lime in different slags shows an initial increase followed by a subsequent decrease. Among the slag studied, the highest average dissolution rate is in slag A3 at 2.24 × 10−6 m s−1, while the lowest rate is in slag A4 at 1.49 × 10−6 m s−1. The presence of the 2CaO·SiO2 layer hinders the mass transfer, thereby further inhibiting the reaction.