EP0155022A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process and apparatus for cleansing soil polluted with toxic substances
Assignee: Ecotechniek BV
•
Filing: 1985-02-08
•
Granted: —
•
Expires: 2005-02-08
Abstract
Abstract The invention relates to a process for cleansing soil polluted with toxic substances having a high temperature of evaporation, said soil being heated in a first rotating kiln (2,3) to evaporate part of the toxic substances, subsequently is heated in a second kiln (10) of a fluid bed type to a higher temperature, partly using the combustion heat of the already liberated vapours after which the heated soil of the second kiln is supplied to the first kiln to raise the temperature of the soil present in the first kiln. Between the first and second kiln there can be a storage silo (9).
Inventors
- 👤 Rudolf Carlo Reintjes
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 10:46
CPC Classifications
F; F23; F23G; F23G5/00; F23G5/02; F23G5/027; B; B09; B09C; B09C1/00; B09C1/06; F23G7/00; F23G7/14; F23G2201/00; F23G2201/50
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
181 words
Process for cleansing soil polluted with toxic substances, by heating said soil in a first treatment kiln to a temperature which is high enough to evaporate at least part of the toxic substances, said vapours subsequently being burned in a second kiln, and the heat fed in and liberated in the process being used by heat exchange for preheating the cold soil fed into the first kiln, and for preheating the combustion air fed to the kilns, while the soil coming out of the first kiln can be cooled and conditioned, in particular moistened, characterised in that soil coming from the first kiln is taken to a second kiln and heated therein to a considerably higher temperature, partly by using the combustion heat of the vapours from the first kiln, and the soil coming from this second kiln is taken to the first kiln at such a point that the soil in it is raised - partly by the heat of the soil coming from this second kiln - to the temperature required in this first kiln for evaporating toxic substances.
Claim 2
Dependent Claim
181 words
Process for cleansing soil polluted with toxic substances, by heating said soil in a first treatment kiln to a temperature which is high enough to evaporate at least part of the toxic substances, said vapours subsequently being burned in a second kiln, and the heat fed in and liberated in the process being used by heat exchange for preheating the cold soil fed into the first kiln, and for preheating the combustion air fed to the kilns, while the soil coming out of the first kiln can be cooled and conditioned, in particular moistened, characterised in that soil coming from the first kiln is taken to a second kiln and heated therein to a considerably higher temperature, partly by using the combustion heat of the vapours from the first kiln, and the soil coming from this second kiln is taken to the first kiln at such a point that the soil in it is raised - partly by the heat of the soil coming from this second kiln - to the temperature required in this first kiln for evaporating toxic substances.
Claim 3
Dependent Claim
166 words
Process for cleansing soil polluted with toxic substances, by heating said soil in a first treatment kiln to a temperature which is high enough to evaporate at least part of the toxic substances, said vapours subsequently being burned in a second kiln, and the heat fed in and liberated in the process being used by heat exchange for preheating the cold soil fed into the first kiln, and for preheating the combustion air fed to the kilns, while the soil coming out of the first kiln can be cooled and conditioned, in particular moistened, characterised in that soil coming from the first kiln is taken to a third kiln and heated therein to a considerably higher temperature, and the-soil coming from this kiln is taken to the first kiln at such a point that the soil in it is raised - partly by the heat of the soil coming from the third kiln - to the temperature required in this first kiln for evaporating toxic substances.
Claim 4
Dependent Claim
166 words
Process for cleansing soil polluted with toxic substances, by heating said soil in a first treatment kiln to a temperature which is high enough to evaporate at least part of the toxic substances, said vapours subsequently being burned in a second kiln, and the heat fed in and liberated in the process being used by heat exchange for preheating the cold soil fed into the first kiln, and for preheating the combustion air fed to the kilns, while the soil coming out of the first kiln can be cooled and conditioned, in particular moistened, characterised in that soil coming from the first kiln is taken to a third kiln and heated therein to a considerably higher temperature, and the-soil coming from this kiln is taken to the first kiln at such a point that the soil in it is raised - partly by the heat of the soil coming from the third kiln - to the temperature required in this first kiln for evaporating toxic substances.
Claim 5
Dependent Claim
34 words
Process according to Claim 1 or 2, characterised in that the gases from the second or third kiln which are liberated during heating of the soil to a high temperature are subjected to after-burning.
Claim 6
Dependent Claim
31 words
Process according to Claim 1, 2 or 3, characterised in that the soil coming from the first kiln and going to the second or third kiln is stored in the interim.
Claim 7
Dependent Claim
39 words
Process according to Claim 1, 2, 3 or 4, in which heating to approx. 250 deg.C takes place in the first kiln, characterised in that there is heating to 800 to 1000 deg.C in the second or third kiln.
Claim 8
Dependent Claim
38 words
Apparatus for carrying out the process according to one or more of the preceding claims, comprising a first countercurrent kiln designed as a rotary kiln, characterised in that the second or third kiln is a fluidised bed kiln.
Claim 9
Dependent Claim
17 words
Apparatus according to Claim 6, characterised in that the interim storage takes place in an insulated silo.
Claim 10
Dependent Claim
38 words
Apparatus according to Claim 6 or Claim 7, characterised in that a heat exchanger is provided between the discharge pipe of the second and/or third kiln and the vapour pipe coming from the first to the second kiln.
References Cited (Backward Citations)
DE1247532B
Cited
FR1425223A
Cited
FR2361606A1
Cited
FR2369505A1
Cited
DE3216771A1
Cited
DE3122395A1
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.