To remove heavy metals from a solid matter to detoxifying it and at the same time, recycling resources of solid matter by causing an inorganic solid matter containing heavy metals to undergo a chemical reaction underwater in a high temperature and high pressure state within the range of a lower temperature than a critical temperature and a higher pressure than a saturated vapor pressure.
Specified amounts of an inorganic solid matter containing heavy metals and water are loaded into a mixing tank 1 and mixed there. Next, the mixture is preheated and supplied into a reaction pipe 4, and further, is caused to undergo a chemical reaction at high temperatures of about 100-350°C and under a high pressure above a saturated vapor pressure to separate the heavy metals. Further, the water and the inorganic solid matter after the chemical reaction are cooled under a vacuum state using a vacuum cooling device 5 and are separated with the help of a solid-liquid separating device 6. In this case, as a drain contains the heavy metals, these metals are recovered by a heavy metal recovery treating device 7. The inorganic solid matter to be unloaded from the solid-liquid separating device 6 is dried by a dryer 8 to be reused as a fine aggregate and a refilling material.
HATAKE YASUHIKO
HORI KENZO
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