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Title: 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:
 [1]
  1. (Monongahela, PA)
Issue Date:
Research Org.:
National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV
OSTI Identifier:
867922
Patent Number(s):
5035722
Assignee:
United States of America as represented by Secretary of (Washington, DC) NETL
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. Tue . "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 = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {1}
}

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