廢氣脫硫方法

Disclosed is a method of exhaust gas desulfurization, comprising a hydration step, a cementation step, and a desulfurization step. The hydration step is to put limestone desulfurization byproduct into the water to obtain byproduct lime, and the limestone desulfurization byproduct is selected from bottom ash, fly ash or the combination thereof; the cementation step is to dry and cement the byproduct lime, and the cemented byproduct lime comprises calcium sulfate dihydrate; the desulfurization step is to heat the cemented byproduct lime to form the porous structure and to react with the exhaust gas. The method of exhaust gas desulfurization according to the present invention can effectively retrieve the limestone desulfurization byproduct to be recycled in the exhaust gas desulfurization to raise the effective usage rate of the limestone desulfurization byproduct.