19.石炭からの水銀等微量元素の放出挙動と存在形態

概要

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Seven powdery coals (four SS coals and three Argonne premium coals) were subjected to pyrolysis at 300℃ under a flow of nitrogen, and the release of Hg, Se, and As from coal was examined. The % release of Hg was greatly varied (20-75%) depending upon the type of coals. But, the % release of Se and As was not so varied. In order to remove pyrite from coal, powdery coals were treated with 0.5M HNO_3 solution at 80℃. The resulting HNO_3-treated coals were also subjected to 300℃-pyrolysis, and the release of Hg was evaluated. Even for coals, which gave low % Hg release when the raw coal was pyrolyzed, nearly complete release of Hg was attained when the treated coal was pyrolyzed. The release behavior of Hg was discussed on the basis of the mode of occurrence of Hg in coal.
一般社団法人日本エネルギー学会の論文
2006-10-12