Microstructural analysis of slag properties associated with calcite precipitation due to passive CO mineralization.

CO mineralization in slag has gained significant attention since it occurs with minimal human intervention and energy input. While the amount of theoretical CO that can be captured within slag has been quantified based on slag composition in several studies, the microstructural and mineralogical effects of slag on its ability to capture CO have not been fully addressed. In this work, the CO uptake within legacy slag samples is analyzed through microstructural characterization.

Image-Based Analysis of Weathered Slag for Calculation of Transport Properties and Passive Carbon Capture.

Weathering of silicate-rich industrial wastes such as slag can reduce emissions from the steelmaking industry. During slag weathering, different minerals spontaneously react with atmospheric CO to produce calcite. Here, we evaluate the CO uptake during slag weathering using image-based analysis.

The utilization of alkaline wastes in passive carbon capture and sequestration: Promises, challenges and environmental aspects.

Alkaline wastes have been the focus of many studies as they act as CO sinks and have the potential to offset emissions from mining and steelmaking industries. Passive carbonation of alkaline wastes mimics natural silicate weathering and provides a promising alternative pathway for CO capture and storage as carbonates, requiring marginal human intervention when compared to ex-situ carbonation. This review summarizes the extant research that has investigated the passive carbonation of alkaline wastes, namely ironmaking and steelmaking slag, mine tailings and demolition wastes, over the past two decades.