Method for producing soil, soil-processing unit, method for processing and unit for processing

Abstract

An object to be treated such as soil, burned fly ashes, or the like containing organic halides is introduced to a hermetically sealable thermal decomposition furnace 310 and heated under reduced pressure. Emitted gases of the object to be treated are treated so that the generation and recomposition of dioxins are supressed. A heated residue of the object to be treated is cooled after being purged with a purge gas which is organic halide-free and has no organic halide generating capacity. Thus, the concentration of organic halides remaining in the heated residue can be held to an extremely low level.

1 - 36 . (canceled)  
     
     
         37 . A soil producing method for producing second soil containing organic halides with a second concentration lower than a first concentration from first soil containing the organic halides with the first concentration, comprising the steps of: 
 heating the first soil so that at least a part of the organic halides are evaporated or decomposed under a vacuum state formed using at least a vacuum pump;    introducing a heated residue of the soil to a hermetic zone; and    cooling the heated residue of the first soil after the hermetic zone is purged by a purge gas which is substantially organic halide-free and not capable of generating organic halides.    
     
     
         38 . The soil producing method as set forth in  claim 37 , 
 wherein the organic halides are dioxins.    
     
     
         39 . The soil producing method as set forth in  claim 37 , 
 wherein the purge gas contains at least one element selected from a group consisting of helium, neon, argon, krypton, xenon, nitrogen, and hydrogen.    
     
     
         40 . The soil producing method as set forth in  claim 37 , further comprising the step of: 
 reducing a concentration of halogen contained in gases produced by heating the first soil.    
     
     
         41 . A soil treatment apparatus for treating soil containing organic halides or being capable of generating organic halides by heating, comprising: 
 means for heating the soil;    a hermetic zone;    means for introducing a heated residue of the soil from the means for heating the soil to the hermetic zone;    means for purging the hermetic zone by a purge gas substantially organic halide-free; and    means for cooling the heated residue.    
     
     
         42 . The soil treatment apparatus as set forth in  claim 41 , 
 wherein the heating means is a combustion furnace for performing combustion treatment for the soil.    
     
     
         43 . The soil treatment apparatus as set forth in  claim 41 , 
 wherein the heating means is a thermal decomposition furnace for performing thermal decomposition treatment for the soil.    
     
     
         44 . The soil treatment apparatus as set forth in  claim 41 , 
 wherein the heating means is a reduced pressure thermal decomposition furnace for performing thermal decomposition treatment for the soil under reduced pressure.    
     
     
         45 . The soil treatment apparatus as set forth in  claim 41 , 
 wherein the purging means introduces the purge gas after the pressure in the hermetic zone is reduced.    
     
     
         46 . The soil treatment apparatus as set forth in  claim 45 , 
 wherein the organic halides are dioxins.    
     
     
         47 . The soil treatment apparatus as set forth in  claim 45 , 
 wherein the purge gas contains at least one element selected from a group consisting of helium, neon, argon, krypton, xenon, nitrogen, and hydrogen.    
     
     
         48 . The soil treatment apparatus as set forth in  claim 41 , further comprising: 
 halogen trapping means having a metal for forming chemical compounds with halogen contained in gases produced by the heating of the soil or an adsorbent for adsorbing the halogen in the produced gases.    
     
     
         49 . The soil treatment apparatus as set forth in  claim 41 , further comprising: 
 reforming means for reforming gases produced by the heating of the soil at a first temperature at which dioxins are decomposed; and    cooling means for cooling the produced gases to a second temperature so that an increase in the concentration of dioxins in the gases is suppressed.    
     
     
         50 . A treatment apparatus for treating an object to be treated containing organic halides or being capable of generating organic halides by heating comprising: 
 means for heating the object;    a hermetic zone;    means for introducing the heated residue to the hermetic zone;    means for purging the hermetic zone by a purge gas which is substantially organic halide-free; and    means for cooling the heated residue.    
     
     
         51 . The soil treatment apparatus as set forth in  claim 50 , 
 wherein the heating means is a combustion furnace for combusting the object.    
     
     
         52 . The soil treatment apparatus as set forth in  claim 50 , 
 wherein the heating means is a thermal decomposition furnace for thermally decomposing the object.    
     
     
         53 . The soil treatment apparatus as set forth in  claim 50 , 
 wherein the heating means is a reduced pressure thermal decomposition furnace for thermally decomposing the object to be treated under reduced pressure.    
     
     
         54 . The soil treatment apparatus as set forth in  claim 50 , 
 wherein the purging means introduces the purge gas after the pressure in the hermetic zone is reduced.    
     
     
         55 . The soil treatment apparatus as set forth in  claim 50 , 
 wherein the organic halides are dioxins.    
     
     
         56 . The soil treatment apparatus as set forth in  claim 54 , 
 wherein the purge gas contains at least one element selected from a group consisting of helium, neon, argon, krypton, xenon, nitrogen, and hydrogen.    
     
     
         57 . The soil treatment apparatus as set forth in  claim 50 , further comprising: 
 halogen trapping means in which metal for forming compounds with halogen contained in gases produced by the heating of the object or an adsorbent for adsorbing the halogen in the produced gases is placed.    
     
     
         58 . The soil treatment apparatus as set forth in  claim 50 , further comprising: 
 reforming means for reforming gases produced by the heating of the object at a first temperature at which dioxins are decomposed; and    cooling means for cooling the produced gases to a second temperature so that an increase in the concentration of dioxins in the gases is suppressed.