蒸汽有效增强CO2直接矿化钢渣到实际生产:阶段演变,微观结构和机制
Xiaoqian Wang1, Changsheng Yue2, Guanghua Lu2
1State Key Laboratory of Advanced Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Materials (Basel, Switzerland)
|October 29, 2025
概括
这项研究引入了一种新的蒸汽辅助CO2矿化工艺,用于钢,显著改善废物利用和减少CO2排放. 该方法有效地使用工业废热将自由氧化 (f-CaO) 转化为碳酸 (CaCO3).
科学领域:
- 材料科学与工程 材料科学与工程
- 环境科学与技术 环境科学与技术
- 化学工程是化学工程的重要组成部分.
背景情况:
- 钢渣是中国的主要工业固体废物,由于存在未反应的自由氧化 (f-CaO),利用率较低.
- 现有的碳化方法,如间接湿矿化,难以扩展,而直接干碳化则耗费大量能量且缓慢.
研究的目的:
- 开发一种高效和工业上可行的方法来碳化和利用钢渣.
- 为了研究蒸汽和二氧化碳对直接钢矿化的协同作用.
- 评估废热回收和过程中烟气利用的潜力.
主要方法:
- 使用蒸汽和二氧化碳 (CO2) 的组合,直接矿化钢.
- 利用热钢渣的废热作为反应温度,消除外部热源.
- 研究蒸汽注入 (15%) 和变化的二氧化碳度对矿化效率和碳固定的影响.
主要成果:
- 达到12.02g/100g的CaCO3含量,相当于每废渣的二氧化碳利用量为52.8公斤,提高了16.7%.
- 将f-CaO含量降低到0.61%,其中91.73%的f-CaO矿化,矿化效率提高了20.24%.
- 即使在20%的二氧化碳度下,也证明了有效的碳固定,在100%的二氧化碳度下达到69.90%的效率.
结论:
- 蒸汽辅助的二氧化碳矿化是一种高效的方法,可以稳定钢渣,提高其利用率.
- 该过程利用废热,并可以利用低度的二氧化碳,使其适合大规模的工业应用.
- 这种方法为工业固体废物管理提供了可持续的解决方案,减少二氧化碳排放并促进循环经济原则.
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