具有不同性质的石灰的溶解行为变成转换器渣
Mengxu Zhang1, Jianli Li1,2, Cao Jia1
1The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China.
Materials (Basel, Switzerland)
|October 14, 2023
概括
钢渣的利用受到自由氧化 (f-CaO) 的阻碍. 这项研究研究了石灰渣的相互作用,揭示了2CaO·SiO2层的形成,影响了钢铁制造过程中的溶解率和质量转移.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 金工程 金工程 金工程
背景情况:
- 中国庞大的粗钢产量产生大量的钢铁渣,由于含有自由氧化 (f-CaO),造成了利用挑战.
- 钢渣中f-CaO的存在导致体积不稳定,限制了其全面的应用.
- 了解石灰渣的相互作用对于缓解这些问题和改善钢渣利用至关重要.
研究的目的:
- 为了研究转换器炼过程中石灰渣接口的动态转换.
- 在不同条件下分析钢中的石灰溶解率.
- 阐明关键矿物阶段的形成和对质量转移的影响.
主要方法:
- 使用电子探针微分析仪 (EPMA) 与能量分散光谱仪进行详细的接口分析.
- 在1400°C的模拟转换器炼条件下.
- 研究了石灰颗粒大小和化速率对不同渣成分 (A1-A4) 溶解行为的影响.
主要成果:
- 观察到显著的接口转化,包括在1400°C时形成CaO-FeO固体溶液, (Ca,Mg,Fe) 橄素和低点酸盐.
- 由于FeO含量下降而形成的坚固的2CaO·SiO2层,由CaO和 (Ca,Mg,Fe) 橄素相互作用产生的.
- 在A2渣中120秒后,最厚的2CaO·SiO2层在20毫米石灰 (0%化) 上形成;溶解速度随石灰颗粒大小增加,但随着化速度表现出复杂的行为.
结论:
- 形成一个连续的,高点的2CaO·SiO2层显著阻碍了石灰和渣之间的质量转移.
- 了解这些界面反应是控制钢属性的关键,并提高其利用率.
- 这项研究提供了对钢中溶解的机制的关键见解,这与流程优化有关.
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