钢渣改性与固碳研究现状及展望

Research status and prospect of slag modification and carbon fixation

我国钢渣储量大、利用率低、堆放造成环境影响严重,为了实现“固废资源化”和“碳达峰、碳中和”的双重目的,钢渣改性和固碳已成为迫切需要解决的问题。研究表明,钢渣中的f-CaO遇水膨胀,使钢渣安定性变差,成为影响钢渣综合利用的主要因素;此外,钢渣的出炉温度能够达到1 500℃以上,这部分热量的自然损耗对资源是一种浪费,在“以废治废、循环利用”的基础上,以高压废气(CO_(2))气淬高温废渣(钢渣),可实现固碳和资源循环利用。本文通过分析目前国内外钢渣改性现状与固碳研究进展,为以耦合气淬技术与热态钢渣固碳技术来实现“固废资源化”的可行性提供参考;结合现有钢渣相关研究数据,将钢渣主要化学成分进行数据拟合,并建立数学模型,以提升不同化学成分钢渣改性的效率。

In order to achieve the dual purposes of “solid waste recycling” and “carbon peaking and carbon neutrality”,based on the situation that China’s slag reserves are large,the utilization rate is low,and the environmental impact caused by stacking is serious,the slag modification and carbon fixation have become urgent problems to be solved.The research shows that f-CaO in slag swells with water,which makes the stability of slag worse and becomes the main factor affecting the comprehensive utilization of slag.In addition,the tapping temperature of slag can reach above 1 500 ℃,and the natural loss of this part of heat is a waste of resources.On the basis of “treating waste with waste and recycling”,high-temperature waste slag can be quenched with high-pressure waste gas(CO_(2)),which can realize carbon fixation and recycling of resources.By analyzing the present situation of slag modification and the research progress of carbon fixation at home and abroad,a reference for the feasibility of coupling gas quenching technology with hot slag carbon fixation technology and realizing “solid waste recycling” can be provided.Combined with the existing research data of slag,the main chemical components of slag are fitted,and a mathematical model is established to improve the modification efficiency of slag with different chemical components.