METHOD FOR DECONTAMINATING BRICK OR CONCRETE
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United States of America Patent
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Issued Date -
Oct 30, 2014
app pub date -
Apr 30, 2013
filing date -
Apr 30, 2013
priority date (Note) -
Abandoned
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Abstract
A method for decontaminating a brick or concrete according to the present invention comprises the steps of: pulverizing the brick or the concrete by using a pulverizing device (pulverizing step); arranging the brick or concrete in a container room and washing the brick or concrete by using a decontamination agent in the container room (washing), wherein the container room has a pressure of above 74 Pa, and a temperature of above 32° C., and the decontamination agent includes a supercritical carbon dioxide flow, a cosolvent and a metal chelating agent; introducing a replacing fluid to the container room to replace the decontamination agent in the container room and then separating the replacing fluid and the brick or concrete (replacing and separating step); and acid cleaning the cosolvent and the metal chelating agent by using an acidic solution (acid cleaning step). A radionuclide may be decontaminated from the brick or concrete.
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