Method of extracting coal from a coal refuse pile
Abstract
A method of extracting coal from a coal refuse pile comprises soaking the coal refuse pile with an aqueous alkali solution and distributing an oxygen-containing gas throughout the coal refuse pile for a time period sufficient to effect oxidation of coal contained in the coal refuse pile. The method further comprises leaching the coal refuse pile with an aqueous alkali solution to solubilize and extract the oxidized coal as alkali salts of humic acids and collecting the resulting solution containing the alkali salts of humic acids. Calcium hydroxide may be added to the solution of alkali salts of humic acid to form precipitated humates useable as a low-ash, low-sulfur solid fuel.
- Inventors:
-
- Monongahela, PA
- Publication Date:
- Research Org.:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
- OSTI Identifier:
- 867922
- Patent Number(s):
- US 5035722
- Assignee:
- United States of America as represented by Secretary of (Washington, DC)
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- method; extracting; coal; refuse; pile; comprises; soaking; aqueous; alkali; solution; distributing; oxygen-containing; gas; throughout; time; period; sufficient; effect; oxidation; contained; leaching; solubilize; extract; oxidized; salts; humic; acids; collecting; resulting; containing; calcium; hydroxide; added; acid; form; precipitated; humates; useable; low-ash; low-sulfur; solid; fuel; refuse pile; coal refuse; aqueous alkali; resulting solution; alkali salts; humic acid; solid fuel; period sufficient; oxygen-containing gas; solution containing; time period; containing gas; calcium hydroxide; alkali solution; comprises leaching; extracting coal; alkali salt; /44/
Citation Formats
Yavorsky, Paul M. Method of extracting coal from a coal refuse pile. United States: N. p., 1991.
Web.
Yavorsky, Paul M. Method of extracting coal from a coal refuse pile. United States.
Yavorsky, Paul M. 1991.
"Method of extracting coal from a coal refuse pile". United States. https://www.osti.gov/servlets/purl/867922.
@article{osti_867922,
title = {Method of extracting coal from a coal refuse pile},
author = {Yavorsky, Paul M},
abstractNote = {A method of extracting coal from a coal refuse pile comprises soaking the coal refuse pile with an aqueous alkali solution and distributing an oxygen-containing gas throughout the coal refuse pile for a time period sufficient to effect oxidation of coal contained in the coal refuse pile. The method further comprises leaching the coal refuse pile with an aqueous alkali solution to solubilize and extract the oxidized coal as alkali salts of humic acids and collecting the resulting solution containing the alkali salts of humic acids. Calcium hydroxide may be added to the solution of alkali salts of humic acid to form precipitated humates useable as a low-ash, low-sulfur solid fuel.},
doi = {},
url = {https://www.osti.gov/biblio/867922},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1991},
month = {Tue Jan 01 00:00:00 EST 1991}
}
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