Method for desulfurization of coal
- Lexington, MA
A process and apparatus for desulfurizing coal which removes sulfur in the inorganic and organic form by preferentially heating the inorganic iron sulfides in coal in a flowing gas to convert some of the inorganic iron sulfides from a pyrite form FeS.sub.2 to a troilite FeS form or a pyrrhotite form Fe.sub.1-x S and release some of the sulfur as a gaseous compound. The troilite and pyrrhotite forms are convenient catalyst for removing the organic sulfur in the next step, which is to react the coal with chemical agents such as alcohol, thus removing the organic sulfur as a liquid or a gas such as H.sub.2 S. The remaining inorganic sulfur is left in the predominantly higher magnetic form of pyrrhotite and is then removed by magnetic separation techniques. Optionally, an organic flocculant may be added after the organic sulfur has been removed and before magnetic separation. The flocculant attaches non-pyrite minerals with the pyrrhotite for removal by magnetic separation to reduce the ash-forming contents.
- Research Organization:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- DOE Contract Number:
- FG02-84ER13244
- Assignee:
- Massachusetts Institute of Technology (Cambridge, MA)
- Patent Number(s):
- US 4678478
- OSTI ID:
- 866301
- Country of Publication:
- United States
- Language:
- English
Similar Records
Method for desulfurization of coal
Mechanism of extraction and desulfurization of coals with alcohols: Final report, March 1--December 31, 1987
Related Subjects
desulfurization
coal
process
apparatus
desulfurizing
removes
sulfur
inorganic
organic
form
preferentially
heating
iron
sulfides
flowing
gas
convert
pyrite
fes
troilite
pyrrhotite
1-x
release
gaseous
compound
forms
convenient
catalyst
removing
step
react
chemical
agents
alcohol
liquid
remaining
left
predominantly
magnetic
removed
separation
techniques
optionally
flocculant
added
attaches
non-pyrite
minerals
removal
reduce
ash-forming
contents
magnetic separation
organic sulfur
chemical agent
chemical agents
separation techniques
iron sulfide
flowing gas
organic iron
iron sulfides
desulfurizing coal
gaseous compound
organic form
separation technique
inorganic iron
inorganic sulfur
/44/201/209/