Agent for absorbing fire coal flue gas mercury pollutant and preparation and use thereof

The present invention discloses an adsorbent for mercury pollution in coom smoke gas, a modified adsorbent thereof, and the preparation and application thereof. By employing the dewatered sludge from the city sewage processing factory as material, the adsorbent for mercury pollution in coom smoke gas is obtained after steps of dipping in chemical medicament, stirring and placing, pyrolysis and charring, and washing and drying. Furthermore, the modified adsorbent obtained by filtering modified element in the surface of the adsorbent can enhance the specific adsorption and the adsorption capability of the mercury of the material, and reduce the used amount of the absorption material. The adsorbent, the modified adsorbent and the compound prepared by the present invention can be used in treatment of the mercury pollution in coom smoke gas in different general operating manners. The adsorbent and the modified adsorbent prepared by the present invention have convenient material source, low production cost, facility application, and remarkable circumstance and economy benefit.