1994 Fiscal Year Final Research Report Summary
Specific Adsorption of Coal-cleaning Bacterium onto Pyrite and/or Sporenite and Desulfurization of Coal.
| Project/Area Number |
05680479
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
環境保全
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| Research Institution | The National University of Yokohama (1994)
The University of Tokyo (1993) |
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Principal Investigator |
KOIZUMI Junichi The National University of Yokohama, Faculty of Engineering, Department of Bioengineering, Associate Professor, 工学部, 助教授 (00150334)
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| Project Period (FY) |
1993 – 1994
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| Keywords | Coal / Biological Desulfurization / Thiobacillus / Pyrite / Adsorption / Floating Separation / Illinois Coal / Tenfu Coal |
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| Research Abstract |
Although the desulfurization and leaching of coal by the use of pyrite-oxidizing activity of Thiobacillus ferrooxidans needed more than 2 weeks, while a new technology required only several minutes, the principle of which was hydrophorbisity change of pyrite particles adsorbed by the bacterium. After fining of coal (<100,100-200, <200 mesh) , the coal pulp was mixed with the bacterial suspension. The bacterial cells was specifically adsorbed onto only pyrite particles originated from coal and the surface energy of the particles were changed from hydrophorbic to hydrophilic state. A Floating column constructed in this study could separate the pyrite particles of which surface was changed to hydrophilic from the coal pulp mixuture. The separation was investigated through changing several conditions such as bacterial dosage, detergent concentration, coal species, etc. The measurements of desulfurization and carbon recovery gave the optimum operation and/or pulp condition, and the operation point for Illnois coal was different from that for Tenfu (Chinese) coal. The particle size distribution was most influenced the optimum operation point.
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