Flue gas desulfurizing agent, preparation method and application thereof

The invention relates to the technical field of dry flue gas desulfurizers, particularly to a flue gas desulfurizing agent, a preparation method and application thereof. The flue gas desulfurizing agent comprises the following components in percentage by mass: 25-80% of modified calcium hydroxide, 5-40% of calcium carbonate and the balance of an additive and a binder, wherein the additive is two or three of iron oxide, sodium carbonate and manganese sulfate, the binder is selected from one or more of pseudo-boehmite, bentonite and a dilute nitric acid solution, and the modified calcium hydroxide is surfactant modified calcium hydroxide. According to the invention, the problems that an existing desulfurizing agent is poor in mechanical strength, harsh in temperature application range, low in desulfurizing agent utilization rate and the like after being formed are solved, and the desulfurizing agent provided by the invention does not need to be roasted at high temperature, has high mechanical strength, also has