Research Progress on the Utilization of Semi-Dry Calcium-Based Desulfurization Dross in China

As a solid waste generated during the desulfurization process of coal-fired power plants, the output of desulfurization dross is increasing year by year. If not properly treated, it may occupy land and potentially pollute the environment. This article reviews the physicochemical properties of desulfurization dross and the progress in its resource utilization. It specifically focuses on the application potential of semi-dry desulfurization dross, emphasizing how its comprehensive resource utilization can reduce environmental pollution and generate considerable economic benefits for related industries. It should be noted, however, that the leaching of heavy metals and the strong alkalinity of desulfurization dross may pose environmental risks such as soil and groundwater contamination. Current research still requires further improvement in the systematic assessment and management strategies of these risks. This review highlights the need to optimize pretreatment technologies for stabilizing desulfurization dross and enhance environmental risk management, to facilitate its large-scale and high-value utilization. This article also looks toward the research directions for semi-dry calcium-based desulfurization dross in the future, aiming to provide a reference for the sustainable development and environmental protection of semi-dry desulfurization dross.