4 years ago

Feature changes of mercury during the carbonation of FGD gypsum from different sources

Feature changes of mercury during the carbonation of FGD gypsum from different sources
Flue gas desulfurization gypsum (FGDG), as byproducts in power plants, is produced in large quantities. A novel technology to recycle FGDG in carbonation process has recently been found. However, the potential hazards to human health and to environment originated from heavy metals residual in FGDG have to be considered in the recycled process. In this study, six FGDG samples (denoted as S1-S6) from coal-fired power plants equipped with different FGD configurations were collected. Heavy metal contents in six original FGDG samples and in their corresponding solid products after carbonation were determined by ICP-OES and cold vapor atomic fluorescence spectrometer (CVAFS). As one of toxic heavy metals present in FGDG, Hg speciation variations induced by the carbonation process were focused on and they were confirmed by means of sequential chemical extraction (SCE) method. Original FGDG samples from six sources and their post-carbonation samples have different distribution of heavy metals, due to their FGD processes applied and byproduct compositions as well. Hg contents in all original FGDG samples exceed the 2nd grade of the Chinese National Standard (1 ug g−1), and a decrease in Hg contents for samples from WFGD process can be observed in their post-carbonation. Formation of carbonates and ammonia complex were responsible for the Hg speciation variations.

Publisher URL: www.sciencedirect.com/science

DOI: S0016236117312383

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