Method for desulfurization of coal
A method is described for treating coal which consists of organic carbonaceous material and inorganic minerals to substantially remove sulfur comprising the steps of: (a) pulverizing the coal to liberate some of the inorganic minerals from the coal; (b) heating the pulverized coal to convert some of the sulfur in the inorganic minerals from the pyrite form of iron sulfide to the more catalytic form of troilite or pyrrhotite; (c) reacting the heated coal with a chemical agent containing elements which, in the presence of the catalytic forms of iron sulfide, combine with the sulfur to remove some of the sulfur from the organic material as gaseous compounds of sulfur; and (d) separating the remaining inorganic iron sulfides, now predominantly in the relatively higher magnetic form of pyrrhotite or troilite, by a magnetic separation process.
- Assignee:
- Massachusetts Institute of Technology, Cambridge, MA
- Patent Number(s):
- US 4678478
- OSTI ID:
- 6310484
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010402* -- Coal
Lignite
& Peat-- Purification & Upgrading
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COAL FINES
COMMINUTION
CONCENTRATORS
DESULFURIZATION
ELEMENTS
ENERGY SOURCES
FLOCCULATION
FOSSIL FUELS
FUELS
HEATING
IRON COMPOUNDS
IRON SULFIDES
MAGNETIC SEPARATORS
MATERIALS
MINERALS
NONMETALS
PRECIPITATION
PYRITE
PYRRHOTITE
REMOVAL
SEPARATION PROCESSES
SULFIDE MINERALS
SULFIDES
SULFUR
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TROILITE