SYNTHESIS OF NaY ZEOLITE FROM WATER QUENCHING SLAG AND ITS APPLICATION IN CO₂ CAPTURE

In order to reduce costs and environmental hazards, this article explores a new synthesis method for preparing NaY zeolite using water quenching residue as the raw material. The effects of the crystallisation time, crystallisation temperature, n(SiO₂)/n(Al₂O₃) ratio and n(Na₂O)/n(Al₂O₃) ratio on the crystallisation of NaY zeolite were investigated, and an ideal synthetic route was obtained. The physical and chemical properties of the prepared NaY zeolite were characterised by XRD, SEM, STEM, FTIR and other methods. In order to understand the adsorption performance of the prepared Y zeolite, different adsorption isotherm models were studied at 30 °C, 60 °C, 90 °C and 0 to 1 bar. At these three temperatures, NaY zeolite has a much higher adsorption capacity for CO₂ than N₂. The Toth equation fits well the CO₂ adsorption of NaY zeolite. The BET test calculates that the micropore specific surface area of NaY zeolite is 838.88m²/g. The range of the zeolite micropores is mainly between 0.35∼0.45nm. The NaY zeolite obtained by the technical route reported in this study has high crystallinity, a uniform particle size, high thermal stability, and excellent CO₂ adsorption performance under flue gas conditions, and will have potential applications in the CO₂ capture in steel plant flue gas prospect