The reuse of ever-increasing Ca- and Mg-bearing alkaline industrial residues produced from coal-fired power plants (e.g., fly ash), iron and steel production (e.g., steel slag) and cement and lime manufacturing plants (e.g., cement and lime kiln dust) coupled with waste flue gas streams (e.g., 5-100 vol.% CO2) is of emerging importance for environmental and resource sustainability. In this context, the development of an integrated approach for the direct capture and conversion of CO2 in flue gas streams to calcium and magnesium carbonates in a single-step process is discussed. Further, the effects of temperature, CO2 concentration in the flue gas streams, and chemical additives on the conversion of CO2 to calcium and magnesium carbonates is evaluated. The bulk kinetic measurements from this study are related to the dynamic changes in the chemical composition and the morphology of these heterogeneous materials using in-operando multi-scale X-ray scattering measurements. The influence of these measurements on the potential applications of the carbonated materials in the built environment is evaluated.

Direct conversion of Ca- and Mg-bearing alkaline industrial residues and CO2-bearing flue gas streams into calcium and magnesium carbonates for environmental reuse

256th National Meeting (2018)

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