Tar sands extraction process
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United States of America Patent
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Nov 16, 1999
Grant Date -
N/A
app pub date -
Apr 8, 1998
filing date -
Jun 26, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A hot water extraction process for extracting bitumen from tar sands is taught wherein the tar sand is conditioned using an alkali metal bicarbonate, an alkali metal carbonate and a liquid hydrocarbon. A source of calcium and/or magnesium ions can also be added. The conditioning step replaces the step of conditioning using caustic soda previously used in tar sand extraction. The use of the alkali metal bicarbonate and carbonate and a liquid hydrocarbon substantially eliminates the production of sludge in tar sand extraction and maintains or improves bitumen recovery. The process allows for hot conditioning solution to be recycled to the process by use of a recycle storage tank.
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