The development of effective carbon capture, utilization and storage (CCUS) technologies is one of the biggest challenges faced by humanity. The scale of the global CO2 emissions is unprecedented, and thus, an array of solutions is needed rather than a single solution for all CO2 sources. Carbon mineralization is one of the most permanent methods of carbon storage and this reaction scheme has also been developed as one of the promising CO2 utilization technologies. By reacting Mg-bearing silicate minerals such as serpentine and olivine and alkaline industrial wastes such as fly ash and iron and steel slag, CO2 can be fixed into thermodynamically stable solid carbonates. One of the key benefits of using alkaline industrial wastes in carbon mineralization is the co-location of CO2 and Ca and Mg sources, which eliminates the need for energy intensive transportations. Furthermore, unlike silicate minerals, alkaline industrial wastes such as iron and steel slag may contain significant amounts of other valuable elements including rare-earth elements (REEs) depending on the origins of their feedstocks. Thus, an innovatively integrated CO2 utilization scheme has been developed to selectively recover REEs from industrial wastes while sequestering CO2 into solid carbonates that can be used as high value filler materials and green construction materials. This study has focused on the in-depth characterizations of unique chemistry and mineralogy of slag containing Ca and REEs using a battery of tools including SEM-EDS. The leaching behaviors of Ca and REEs in the presence of CO2 are investigated to provide insights into the feasibility of this new materials distillation process that can close material cycles and create renewable materials from wastes.<br/>

Materials distillation of unconventional resources: Unique leaching behaviors of rare-earth elements from alkaline industrial wastes during CO<sub>2</sub> utilization

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.

Materials distillation of unconventional resources: Unique leaching behaviors of rare-earth elements from alkaline industrial wastes during CO2 utilization

Materials distillation of unconventional resources: Unique leaching behaviors of rare-earth elements from alkaline industrial wastes during CO₂ utilization