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Author Spiro, C. L. ♦ Holmes, D. S. ♦ Lobos, J.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword COAL, LIGNITE, AND PEAT ♦ COAL ♦ DESULFURIZATION ♦ PYRITE ♦ REMOVAL ♦ COAL SEAMS ♦ IN-SITU PROCESSING ♦ THIOBACILLUS FERROXIDANS ♦ TIME DEPENDENCE ♦ TOMOGRAPHY ♦ BACILLUS ♦ BACTERIA ♦ CARBONACEOUS MATERIALS ♦ CHALCOGENIDES ♦ CHEMICAL REACTIONS ♦ COAL DEPOSITS ♦ DIAGNOSTIC TECHNIQUES ♦ ENERGY SOURCES ♦ FOSSIL FUELS ♦ FUELS ♦ GEOLOGIC DEPOSITS ♦ IRON COMPOUNDS ♦ IRON SULFIDES ♦ MATERIALS ♦ MICROORGANISMS ♦ MINERAL RESOURCES ♦ MINERALS ♦ PROCESSING ♦ RESOURCES ♦ SULFIDE MINERALS ♦ SULFIDES ♦ SULFUR COMPOUNDS ♦ SULFUR-OXIDIZING BACTERIA ♦ TRANSITION ELEMENT COMPOUNDS 010402* -- Coal, Lignite, & Peat-- Purification & Upgrading
Abstract The bacterial removal of pyritic sulfur from in situ deposits of coal deserves attention. The process has the advantage of economy and extended periods of time to carry out the sulfur removal. For example, some projected coal reserves are not expected to be mined for another 25-50 years. Possibly a culture and appropriate medium could be admitted to the seam and be allowed to slowly permeate the coal for sufficient time that significant desulfurization occurs. A fair assessment of the in situ desulfurization kinetics and efficiency has not been made for wont of an adequate assay. Therefore, as a preliminary step to examine the feasibility of in situ pyrite removal the authors have investigated the bacterial removal of the pyrite from lump coal by using X-ray computed tomography to follow the dissolution of pyrite inclusions. It is concluded that X-ray computed tomography is an effective tool to assay in situ phenomena. In particular, mixed cultures of Thiobacillus ferrooxidans and associated acidophilic bacteria were used to treat a Lower Kittanning seam high-volatile A bituminous coal. It was demonstrated that pyrite inclusions can be removed at a depth of 17 mm within the lump over a 4-month period. 19 references, 4 figures, 2 tables.
Educational Use Research
Learning Resource Type Article
Publisher Place United States
Journal Energy Fuel
Volume Number 1
Issue Number 1
Organization General Electric Corporate Research and Development Lab., Schenectady, NY


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