不锈钢渣碳化影响因素及其机理研究

为开发γ-C₂S不锈钢渣碳储存的潜力,最大限度地提高不锈钢渣的综合利用率。通过研究主要碳化参数(如液固比、成型压力、CO₂分压)对不锈钢渣碳化性能的影响规律来评估不锈钢渣的CO₂储存能力,以期能够提供更佳的不锈钢渣碳化过程。利用XRD、SEM/EDS、DSC/TG分析对不锈钢渣碳化产物组成及微观形貌进行表征,并探索其碳化机理。结果表明,较佳碳化参数为成型压力为2.50 MPa,液固比为10%,CO₂分压为0.3 MPa。较佳碳化条件下每千克不锈钢渣可固化储存CO₂气体约123.6 g。不锈钢渣碳化过程以γ-C₂S碳化反应为主,碳化产物中出现了片状、颗粒状的CaCO₃,随碳化时间延长,晶体逐渐长大为团簇状。因此,利用不锈钢渣储备碳及制备碳化制品是可行的。

Influencing Factors and Mechanism of Stainless Steel Slag Carbonation

This study aim to develop the carbon storage potential of γ-C₂S stainless steel slag, and to maximize the comprehensive utilization rate of stainless steel slag. The impacts of several key parameters, such as molding pressure, liquid-solid ratio, CO₂ partial pressure on the carbonation performance were studied, and the CO₂ storage capacity of stainless steel slag was evaluated, so that a better carbonation process of the stainless steel slag could be offered. The composition and microstructure of the carbide products of stainless steel slag were characterized by XRD, SEM/EDS, DSC/TG to explore the carbonation mechanism. The results show that the optimal carbonation parameters are as follows: liquid-solid ratio 10%, molding pressure of 2.50 MPa, and CO₂ partial pressure of 0.3 MPa. In above mentioned conditions, about 123.6 g of CO₂ is stored in every kilogram of stainless steel slag. The γ-C₂S carbonation is main reaction during the carbonation progress. Flake and granular CaCO₃ are first observed, and then they gradually grow into clusters over time. Therefore, the storage and preparation of carbonized products using stainless steel slag are practicable.