Method for removing element state mercury in flue gas

The invention discloses a method for removing element state mercury in flue gas and belongs to the technical field of purification of flue gas. The method for removing the element state mercury in the flue gas disclosed by the invention comprises the following steps of: a, firstly preparing absorption liquid, namely aqueous solution of a mercury remover, wherein the mercury remover comprises sodium hypochlorite, copper sulphate and an additive, and the additive is one of potassium bicarbonate, potassium sulphate and potassium peroxodisulphate; b, atomizing the absorption liquid and spraying the adsorption liquid into a flue gas pipeline, so that the element state mercury is converted into ion state mercury; and c, finally introducing the flue gas discharged from a flue gas outlet pipeline into a sulphide solution, and directly absorbing the ion state mercury. By adopting the method for removing the element state mercury in a gas phase form, the element state liquid mercury is oxidized into the ion state mercu