Ultrasound-Assisted Capture of CO2 From Flue Gas Using Steel Slag Leachate and Synthesis of Vaterite-Type CaCO3 AITranslate

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This study investigated the sequestration of CO2 from flue gas using a Ca-rich leachate obtained by leaching steel slag with CH3COOH. Ultrasound was used to accelerate the fixation of low-concentration CO2 in the leachate and to induce the transformation of CaCO3 crystals into the vaterite form with a uniform particle distribution. Ultrasound-induced cavitation bubbles in ethanol reduced the nucleation barrier and prevented clustering by maintaining a uniform dispersion of vaterite CaCO3 crystals, which impeded their conversion to other CaCO3 polymorphs. Experimental results revealed that ultrasonic action could effectively fix low-concentration CO2 in the leachate reaction system. Moreover, the addition of ethanol as a surfactant yielded vaterite CaCO3 with an average particle size of 3.2 μm and uniform granularity of 1.4–5.6 μm. This product meets the industrial standards for light CaCO3 micropowder, which makes it suitable for various applications as a filling material. The proposed method presents a sustainable approach for the valorization of steel slag and low-concentration CO2 from flue gas, and it highlights the potential of ultrasonic technology to improve the chemical processes required for Carbon Capture, Utilization, and Storage technologies.