Simultaneous Removing SO 2 and NO by Ammonia-Fe II EDTA Solution Coupled with Iron Regeneration

Han, J Yao, X Qin, L Jiang, Chen
2016 Int. J. Environ. Res   unpublished
In this paper, the simultaneous absorption of SO 2 and NO from the simulated sintering flue gas by ammonia-Fe II EDTA complex solution was investigated in a pilot scale reactor. The experiment results showed that the maximum removal efficiencies of SO 2 and NOx by ammonia-Fe II EDTA complex solution scrubbing were 99% and 68.26%, respectively. However, the denitiration efficiency was gradually declined due to the oxidation of Fe II EDTA into Fe III EDTA. At the same time, Fe III EDTA did not
more » ... III EDTA did not have the ability of binding NO. In order to keep the high denitration efficiency, Fe III EDTA regeneration by iron and the surplus iron ion removal by the precipitation were proposed. Moreover, the optimum parameters of the surplus iron ion removal were also investigated, the experimental results showed that the optimum addition of ammonia carbonate was 0.4 g/L. After the regeneration and precipitation, the denitration efficiency by ammonia-Fe II EDTA complex solution could be kept at 55%, and the desulfurization efficiency in the test was above 99%.