微生物浮遊選炭による重金属除去-高硫黄炭中の重金属元素の局在性とその除去性-

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This report presents findings on the enhanced removal of heavy metals (As, Se, Cd, Cr, Pb and Hg) from high sulfur coal by the flotation, which was conducted with bacteria to reject metals coexisting with pyrite. Pittsburgh, Tenfu and Heisaku coal were divided into five specific gravity fractions using heavy liquid separation, then analyzed. The low-gravity fractions (<1.4) contained large amount of organic matter and little heavy metals. The metals were mainly found in the high-gravity fractions (>3.0) containing large amounts of pyrite. A clear relationship was observed between pyrite contents and the amount of heavy metals in all fractions (Correlation coefficient : r> 0.96), while the relationship between ash content and the amount of heavy metals was not as clear (r = 0.47 〜 0.86). Heavy metals were distributed with pyrite, but not with ash. This result shows that for the removal of heavy metals from coal, the separation of pyrite from organic matters is important. In order to enhance the pyrite removal from coal, bacterial treatment was applied to coal flotation to reduce heavy metal contents in froth. By the addition of bacteria to the flotation, the pyrite rejection of Pittsburgh, Tenfu and Heisaku coal increased from 11.8 (without bacteria) to 48.9% (with bacteria), from 36.2 to 61.2%, and from 55.5 to 64.0%, respectively. Under these conditions, the rejection of each heavy metal, except mercury, from all coals increased from 12.9 〜 69.1% to 31.1 〜 84.2%. These results clearly show that the use of bacteria could enhance the removal of heavy metals from coal in flotation as result of an increase in pyrite removal.
社団法人資源・素材学会の論文
1999-12-25

微生物浮遊選炭による重金属除去-高硫黄炭中の重金属元素の局在性とその除去性-

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