| 摘要 |
A flue gas treatment method is provided to remove effectively mercury and/or arsenic from flue gas generated from various combustion facilities. A flue gas treatment method comprises the steps of: injecting iron sulfide into flue gas generated from a combustion furnace, thereby reacting the iron sulfide with the flue gas to generate HgS, As2S3, HgO, As2O3, and iron compounds onto which at least one of mercury and arsenic is adsorbed; and removing the HgS, As2S3, HgO, As2O3, and iron compounds from the flue gas. The iron sulfide is at least one of FeS and Fe2S3. THe iron sulfide is injected into the flue gas in a way that an atomic number ratio of mercury or arsenic to sulfur is in a range of 1:10 to 10,000. The iron sulfide and the flue gas are reacted with each other in a temperature range of 150 to 700 deg.C. The iron sulfide is obtained by reacting waste ferrous sulfate and waste ferric sulfate generated during the production of TiO2 with H2S generated from an ironworks or a crude oil refining process. The iron compounds are iron hydroxide and iron oxide. The HgS, As2S3, HgO, As2O3, and iron compounds are removed from the flue gas by a filtering dust collector, an electrostatic precipitator, a dry scrubber, a wet scrubber, or a combination thereof. |
