Aplicação de escória siderúrgica para captura de dióxido de carbono em meio aquoso
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Data
2025-11-28
Autores
Guio, Laura Loyola Marion
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Universidade Federal do Espírito Santo
Resumo
This study investigated the application of steel slag, a material rich in calcium and magnesium oxides, for carbon dioxide (CO₂) capture in aqueous media through carbonation. The main objective was to evaluate the technological potential of steel slag for large-scale CO₂ sequestration. The experimental methodology encompassed the slag's particle size reduction to increase its surface area, conducting water solubilization assays to quantify ion release, and performing solution carbonation experiments with CO₂ in batch mode. Characterization of the slag and precipitates by X-ray diffraction (XRD), thermogravimetric analysis (TGA), Raman spectroscopy, and titrimetry confirmed mineralogical transformation and predominant calcite (CaCO₃) formation. Seeding procedure proved to be a more effective method for promoting precipitation compared to cooling, with seeded samples (associated with the condition "Precipitated with slag bed") achieving a practical CO₂ sequestration potential (RCO₂) of 39.7%, whereas cooling resulted in 8.40% RCO₂ and a carbonation degree of 19.10%. Although limitations such as low calcium-to-carbonate conversion and the corrosive tendency of the solution were identified, the high initial reactivity of steel slag and the purity of the formed calcite represent opportunities for its large-scale valorization. It is concluded that steel slag possesses promising potential in industrial decarbonization and the circular economy
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Escória siderúrgica , Créditos de carbono , Carbonatação , Economia circular , CaCO3