| Controlling sulfur dioxide pollution has attract universal attentions on domestic andinternational. The wet flue-gas desulfurization systems （WFGD） was one of the effectualways in controlling sulfur dioxide pollution and we benefited much from it, however, largequantities of desulfurization residues named as FGD gypsum were produced particularlywhen a high-sulphur coal is burnt, how to deal with these residues had become hotspotstudies. The aim of the work was to study the chemical, physical, the contents of theelements, the environmental behaviors of the harmful heavy metal elements and thethermochemistry of the residues obtained from WFGD system in field.Various investigation methods were used in the study of the characterization of wetflue-gas desulfurization residues from600MW coal-fired power plant and we found somedatas in desulfurization residues; then the study on Microwave Digestion of FGD gypsumfor the determination of11harmful heavy metal elements by ICPMS show that thedigestion was well by this way, and the contents of the multielement were between0.50～17.25μg/g, the RSD were between0.93%～8.27%; the study of imitating the acid rainenvironment scene show that mercury is easy to permeates, and have the risk of pollutingenvironment; the study with Hg-CEM indicates that the mercury releases quantity under thelow temperature and nitrogen atmosphere were very small and the biggest releasingtemperature take place between200-450degrees, after that, the mercury quantity descendgradually.Finally, several methods were used to determine the oxides concentration withreferring to standard substance, and the results show that the titration analysis was a betterway for the test of the CaO by contrast, as the same way, XRFS was a better way for theSiO2, Fe2O3and K2O, and the ICPAES was a better way for the Al2O3, and the AAS was abetter way for the MgO, while the usual ways did not fit for the Na2O and TiO2, whosecontents were too low. |
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