Method and apparatus for removing contaminants from particulate material
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United States of America Patent
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Feb 22, 1994
Grant Date -
N/A
app pub date -
Jun 4, 1992
filing date -
Jun 4, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for removing contaminants, including hydrocarbon and metal, from contaminated particulate material, such as gravel, soil, and the like. Initially, contaminants are removed by contact with water at a temperature higher than a melting temperature of the contaminants to remove them by melting. The removed contaminants are then subjected to specific gravity separation in water and filtration, including ion exchange and activated carbon filtration.
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