Comparative Mössbauer study of the effects of natural weathering and artificial oxidation on iron minerals present in coal
Fresh and naturally weathered coal samples from the same seam as well as the former one submitted to artificial oxidation treatments were studied by Mössbauer spectroscopy to examine the effect of coal oxidation conditions on the transformations of iron minerals. It was found that illite, pyrite and siderite are converted into jarosite and goethite in a natural environment, whereas only a small fraction of Fe2+ from pyrite was oxidized to Fe3+ under laboratory conditions, even after heating in air to 468 K. It is concluded that artificial oxidation experiments hardly reproduce the conditions met by coal when submitted to natural weathering.
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| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | artículo biblioteca |
| Published: |
Elsevier
1993-04-04
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| Online Access: | http://hdl.handle.net/10261/332223 |
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| Summary: | Fresh and naturally weathered coal samples from the same seam as well as the former one submitted to artificial oxidation treatments were studied by Mössbauer spectroscopy to examine the effect of coal oxidation conditions on the transformations of iron minerals. It was found that illite, pyrite and siderite are converted into jarosite and goethite in a natural environment, whereas only a small fraction of Fe2+ from pyrite was oxidized to Fe3+ under laboratory conditions, even after heating in air to 468 K. It is concluded that artificial oxidation experiments hardly reproduce the conditions met by coal when submitted to natural weathering. |
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