Experimental Study on Median Temperature Sulfur Fixation Characteristics and Mechanism in flue gas of Alkaliferous Industry Waste

摘要

The median temperature sulfur fixation characteristics in flue gas of experimental wastes were studied by Tube Furnace, the phase composition and mineral content of sulfur fixation product were analyzed by XRD and thermal gravimetric, median-temperature sulfur fixation mechanism of alkali industrial waste were discussed, which provide theoretical basis for preparation of waste type median-temperature sulfur fixation agents. It can be found that some experiments alkali industrial waste such as: alkali slag, red mud and salt slurry have better sulfur fixation characteristics because of rich in Al_2O_3, Fe_2O_3 and SiO_2, and so on, On the one hand, Al_2O_3, SiO_2 and Fe_2O_3 make initial grain size of carbonate crystallization small and dispersion high, which can increase surface area of sulfur fixation reaction, thin product thickness, reduce diffusion resistance of product layer and raise the proportion of carbonate forming sulfate, on the other hand, Al_2O_3, SiO_2 and Fe_2O_3 play the role of transferring oxygen during the formation process of CaSO_4, which result in CaSO_3 is easily oxidized and form sulfate calcium.