Calcium carbide slag, generated in the hydrolysis process of calcium carbide, is an potential carbon capture reagent because its main ingredient is Ca(OH)_2. Calcium carbide slag, a by-product of a resin factory was used as carbon capture reagent. The change of p H and electrical conductivity(EC) of the calcium carbide slag slurry with different solid-to-liquid ratios, as well as the capture efficiency and dynamics under different temperatures and flow rates of CO_2 were studied. The properties of solid were characterized with XRD, TG-DTA, SEM and FT-IR before and after capturing carbon. The results show that the change of p H and EC were greater with low solid-to-liquid ratio than that with high solid-to-liquid ratio. The analysis of XRD and SEM show that the content of Ca CO_3 increased significantly, which improved that Ca(OH)_2 and free Ca O were reacted with CO_2. The results of TG-DTA and FT-IR show that the physicochemical properties and microstructure of the slag changed after capturing CO_2 because of the increase of Ca CO_3 content. All the results mentioned above improve the feasibility of utilizing calcium carbide slag to capture CO_2 and offer a practical way for carbon emission reduction and disposal of wasted calcium carbide slag.
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