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Seven powdery coals (four SS coals and three Argonne premium coals) were subjected to pyrolysis at 300 °C under a flow of nitrogen, and the release of Hg from coal was examined. The % release of Hg greatly varied from 24 to 83% depending upon the type of coals. In order to remove pyrite from coal, powdery coal was treated with 0.5 M HNO 3 at 80 °C. The HNO 3 -treated coals were also...
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