No.61 排煙脱硫石膏からの水銀化合物の分離(灰・微量元素(2))

概要

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To regenerate the flue gas desulfurization ( FGD ) gypsum produced from coal fired power plant, change in chemical form of calcium and release behavior of mercury were investigated with the addition of carbon. The release behavior of mercury from FGD gypsum generated from a commercial plant was compared to that from model compounds prepared from chemical reagents. It was observed that FGD gypsum contained 0.7 ppmw of mercury and its release behavior was similar to that of HgO. When gypsum was converted to CaO by carbon reduction, release of mercury was accelerated at temperature range from 250 to 300 oC. HgO in FGD gypsum was reduced by carbon and converted to high volatile elemental mercury. It can be concluded that mercury compounds are easily removed in the regeneration process of FGD gypsum by carbon reduction.
2012-10-15