Abstract: In this paper，dry-discharged and wet-discharged calcium carbide slag were used as raw materials to prepare sorbents suitable for dry desulfurization of circulating fluidized beds， which were characterized by indicators such as TGA，SEM and BET etc．The results show that it is not only of good economic benefit，but also of good social and political benefit to turn calcium carbide slag into treasure.

Key words: Carbide slag, Slaked lime, Flue gas desulfurization, Waste material utilization