Desulfurization of pittsburgh coal by microbial column flotation |
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Authors: | Naoya Ohmura Hiroshi Saiki |
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Institution: | (1) Department of Biotechnology, Abiko Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, 270-11 Abikoshi, Chiba, Japan |
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Abstract: | Microbial column flotation usingThiobacillus ferrooxidans was applied for desulfurization of Pittsburgh coal of CWM (Coal-Water Mixture) size between 38 μm and 75 μm. The coal contained
ferrous ion which would interfere separation of pyrite from coal by microbial flotation. The wash-out of ferrous ion with
0.5N HC1 solution enabled pyrite removal from coal. The coal was divided into two parts, the small-size coal between 38 μm
and 53 μm, and the large-size coal between 53 μm and 75 μm. The pyritic sulfur content was decreased from 2.88% of the feed
coal to 0.98% of the product coal for the largesize coal and from 2.77% of the feed coal to 1.12% of the product coal for
the small-size coal by microbial flotation. The decrease was based on removal of liberated pyrite particles (between 20 μm
and 70 μm). However, the fine particles (less than 20 μm) could not be removed even though the pyrite particles were liberated
from coal particles. The microbial column flotation was more effective for desulfurization of the large liberated pyrite particle
than that of the small. It was not effective for desulfurization of the locked pyrite particles that were buried in coal particles.
Both the pyrite liberation from coal and its particle size are important factors for the pyrite removal by microbial column
flotation. |
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Keywords: | Thiobacillus ferrooxidans flotation coal pyrite desulfurization |
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