Abstract
Batch and semi-batch elution tests were conducted to determine the elution pattern and dissolvable amount of mercury in desulfurization gypsum produced in a coal-fired power plant. Two gypsum samples obtained from double-contact-flow-type desulfurization equipment were used. Chemical forms of mercury in gypsum were identified by temperature programmed desorption–cold vapor atomic absorption spectroscopy. The elution behavior of mercury varied significantly with the testing method. In the batch elution test, an industrial standard method, mercury eluted into the water rapidly and was then adsorbed by gypsum. This behavior was kinetically simulated with the sequential elution and adsorption of mercury, showing the maximum elution peak. In contrast, in the semi-batch method, the adsorption phenomenon was negligible, and the ultimate amount of eluted mercury could be determined. Thus, the semi-batch method is more accurate for evaluating mercury elution from desulfurization gypsum.
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