In a method of controlling air pollution, a combustion gas is passed through a slurry of an alkaline-earth metal sulfide and a redox buffer (e.g., a phosphate), preferably in combination with an alkaline-earth metal carbonate and/or hydroxide. A composition for removing a heavy metal from a combustion...http://www.google.fr/patents/US7407602?utm_source=gb-gplus-shareBrevet US7407602 - Air pollution control
