COMPOSITIONS AND METHODS TO SEQUESTER FLUE GAS MERCURY IN CONCRETE

摘要

Mercury adsorbed from combustion gas by activated carbon can be sequester ed in concrete containing air entraining admixtures. The activated carbon ma y be made by providing a carbon char made from anthracite or low-volatile bi tuminous coal that was devolatilized and carbonized in an oxygen-depleted en vironment and activating this char in the presence of steam to provide an ac tivated carbon with an acid blue 80 index of less than about 30 milligrams p er gram of carbon. The activated carbon may also be made by providing a carb on char that was devolatilized and carbonized in an oxygen-depleted environm ent and activating this char in the presence of oxygen to provide an activat ed carbon. The carbon may be injected into a combustion gas stream containin g fly ash and mercury and may then be removed with fly ash from the gas stre am. The resulting composition may be used as a partial substitute for cement in air-entrained concretes.