This treatment process involves washing the flue gas to remove dust, followed by countercurrent contact with lean liquid in an absorption tower to remove SO2. The purified gas meets emission standards. The rich liquid undergoes heat exchange and is heated in a regeneration tower to release SO2, while the regenerated lean liquid is recycled. A portion of the lean liquid is refined using desalination resin (for anion removal) and sodium removal resin (for cation removal). Saturated resin is regenerated with alkali (e.g., NaOH) for reuse, achieving circulation.

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