Effect of accelerated carbonation on AOD

Non-stabilized Argon Oxygen Decarburisation (AODNS) slag in powdered form was examined for its carbon dioxide sequestration capacity and for its potential utilization in the fabrication of high value building materials. The study aimed to explore the effectiveness of accelerated carbonation processes in enhancing the mechanical properties of AODNS slag for sustainable construction applications. The methodology involved curing the sample under various temperature and pressure conditions to assess the formation of carbonation products and their influence on the material's performance. Results indicated that the process of carbonation significantly improved the compressive strengths of the slag, achieving values exceeding 30 MPa, demonstrating its viability as a construction material. Furthermore, X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses revealed changes in mineralogy and morphology, indicating the formation of desirable carbonation products such as calcite. Importantly, carbonation also resulted in a reduction of leaching of heavy metals from the slag, highlighting its environmental benefits in waste management. These findings suggest that AOD stainless steel slag can be effectively valorized through mineral carbonation techniques, contributing to both waste recycling and carbon capture efforts.