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Selective oxidation of pyrites in coal: Final report

Technical Report ·
OSTI ID:7055704
; ;
Pyritic sulfur often represents more than half the sulfur in high-rank coals. With certain bituminous coals, such as Illinois No. 6, physical coal cleaning is often ineffective due to the finely dispersed nature of the pyrite. Selective oxidation of pyritic sulfur is a problem in control; sufficient heat must be imposed to achieve oxidation of the pyritic sulfur, but not to achieve ignition of the coal with air. Processing in a fluidized bed with an air/steam fluidizing gas appears to achieve this control. Two Illinois No. 6 coals and a Montana Rosebud coal were reacted with preheated fluidizing gases (steam + air). An amount of sulfur slightly in excess of pyritic sulfur was removed from the Illinois No. 6 coals without excessive loss of heating value. With the Montana coal, above 50% of the pyritic sulfur was removed. With all coals tested to date, 40 to 60% total sulfur removal has been achieved. This method of processing appears to have potential for the desulfurization of coal fines, and may be of particular interest where sulfur-emission regulations could be met by removal of pyritic sulfur only. 9 refs., 13 figs., 6 tabs.
Research Organization:
Battelle Columbus Labs., OH (USA)
OSTI ID:
7055704
Report Number(s):
EPRI-AP-4873; ON: TI87920099
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010402* -- Coal
Lignite
& Peat-- Purification & Upgrading
CAPITALIZED COST
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COAL FINES
COST
DATA
DESULFURIZATION
DIAGRAMS
ECONOMICS
ELEMENTS
ENERGY SOURCES
EXPERIMENTAL DATA
FLOWSHEETS
FLUIDIZED BEDS
FOSSIL FUELS
FUELS
HIGH TEMPERATURE
INFORMATION
IRON COMPOUNDS
IRON SULFIDES
MATERIALS
MINERALS
NONMETALS
NUMERICAL DATA
OXIDATION
PYRITE
REMOVAL
SULFIDE MINERALS
SULFIDES
SULFUR
SULFUR COMPOUNDS
SULFUR CONTENT
TEMPERATURE EFFECTS
TRANSITION ELEMENT COMPOUNDS