A new strategy for the reuse of typical hazardous solid waste electric arc furnace dust (EAFD): Efficient desulfurization by EAFD slurry

Low-cost and high-efficiency SO2 removal technology is a great challenge in industrial exhaust gas purification. This paper innovatively proposes a "treating waste with waste" strategy for desulfurization using electric arc furnace dust (EAFD). The experimental results show that the EAFD slurry can achieve high-efficiency desul-furization and Zn leaching capacity. Specifically, the effects of temperature, oxygen concentration, solid-liquid ratio, gas flow rate, and SO2 concentration on the desulfurization efficiency of EAFD slurry were studied by a single-factor experiment method. Further studies show that the desulfurization performance is maintained when the EAFD slurry is acidic, the total mass of the EAFD slurry is reduced by approximately 60 % after deactivation, and the zinc (Zn) leaching rate reaches 50 %. In addition, the XRD, ICP, IC, SEM, XRF, and EDS characterization results of the main products show that the main active components of the EAFD desulfurization slurry are ZnO and ZnFe2O4. Finally, a possible mechanism of EAFD slurry desulfurization is proposed based on the experi-mental and characterization results.