Method of extracting coal from a coal-refuse pile

Patent · Mon Sep 18 00:00:00 EDT 1989

OSTI ID:5279552

Yavorsky, P M

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.

• Research Organization: Department of the Interior, Washington, DC (USA)
• Assignee: Department of the Interior, Washington, DC
• Patent Number(s): A US 7-408586
• OSTI ID: 5279552
• Resource Relation: Other Information: This Government-owned invention available for U.S. licensing and, possibly, for foreign licensing. Copy of application available NTIS
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
COAL MINES
SPOIL BANKS
REFUSE DERIVED FUELS
WASTE MANAGEMENT
CALCIUM HYDROXIDES
COAL EXTRACTS
HUMIC ACIDS
LEACHING
OXIDATION
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CHEMICAL REACTIONS
DISSOLUTION
FUELS
HYDROGEN COMPOUNDS
HYDROXIDES
MANAGEMENT
MINES
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
SEPARATION PROCESSES
UNDERGROUND FACILITIES
010800* - Coal
Lignite
& Peat- Waste Management
320305 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management