EP3755475A1 - Use of a hydraulic binder composition in a method for inerting polluted soil - Google Patents
Use of a hydraulic binder composition in a method for inerting polluted soilInfo
- Publication number
- EP3755475A1 EP3755475A1 EP19711961.3A EP19711961A EP3755475A1 EP 3755475 A1 EP3755475 A1 EP 3755475A1 EP 19711961 A EP19711961 A EP 19711961A EP 3755475 A1 EP3755475 A1 EP 3755475A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- composition
- clinker
- varies
- lime
- phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/10—Cements, e.g. Portland cement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/06—Oxides, Hydroxides
- C04B22/062—Oxides, Hydroxides of the alkali or alkaline-earth metals
- C04B22/064—Oxides, Hydroxides of the alkali or alkaline-earth metals of the alkaline-earth metals
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
- C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/32—Aluminous cements
- C04B7/323—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00767—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Definitions
- the present invention relates to the use of a composition comprising a hydraulic binder and lime in a polluted soil inerting process as well as some of the compositions used.
- Soil pollution is a current issue and is mobilizing more and more resources, in particular because of its direct impact on the environment and, consequently, on the health of humans, animals and plants.
- a soil is polluted when it contains one or more pollutant (s) or contaminant (s) likely to cause biological, physical and chemical alterations.
- the pollutant is defined as a biological, physical or chemical alteragen, which beyond a certain threshold, and sometimes under certain conditions, develops negative impacts on all or part of an ecosystem or the environment in general. In other words, the introduction of toxic substances, possibly radioactive, or pathogenic organisms cause a more or less significant disruption of the ecosystem.
- Pollutants that are regularly found in soils include organic materials, hydrocarbons such as polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), sulphates, chlorides, fluorides and heavy metals.
- Polluted soil in turn becomes a possible source of direct or indirect diffusion of pollutants into the environment, especially via water, gaseous emissions or through reconcentration and transfer of pollutants by living organisms such as bacteria, fungi or plants when they are in turn eaten by animals. Once in the food chain, pollutants come into contact with humans through their diet. Depending on the pollutant and the context, the impacts of soil pollution may be direct or indirect, immediate or delayed.
- Soil remediation is therefore a major issue for the environment and health.
- the inerting processes usually used are stabilization / solidification processes using hydraulic binders.
- the stabilization technique is a process in which the pollutant is converted to a chemically more stable form, while that of solidification traps heavy metals in a solid structure.
- the results of conventional leaching tests (in particular according to standards NF EN 12457-1, 12457-2, 12457-3 and 12457-4 of 2002) prove the effectiveness of these techniques.
- the addition of the hydraulic binder makes it possible to obtain a stabilization of the soil (chemical reduction of the dangerous potential by conversion of the contaminants in a less soluble, mobile or toxic form) and solidification (encapsulation of the waste forming a solid material).
- the migration of contaminants is reduced by decreasing the area exposed to leaching and / or waterproofing the treated material.
- the hydraulic binders most conventionally used in the process of inerting polluted soil are Portland cements and slag cements.
- the hydration of these cements in the presence of pollutant not only allows a trapping of the pollutant in the cement structure by physically reducing its mobility and therefore its potential leaching, but also the formation, during the hydration of the cement, of a combination of the pollutant in the crystal structure of the hydrates.
- sulphoaluminous clinkers is also known and is of particular interest because of the formation in large quantities during its hydration of ettringite, a mineral species composed of calcium sulphate and aluminum hydrate, of chemical formula Ca 6 Al 2 (S0 4 ) 3 (OH) 2 .26H 2 0.
- Ettringite is a product of the reaction between C3A tricalcium aluminate, sulfate, and water. Ettringite allows many ionic substitutions in its structure without modifying its stability. It is therefore able to capture and inerter the main heavy metals in cationic form in its structure.
- ettringite requires calcium sulfate to form. It thus also allows forming itself to reduce the sulphate ion content of the soil.
- the present invention relates to the use of a composition
- a composition comprising:
- x varies from 2 to 3;
- polyluted soil inerting process means any process for the reclassification of polluted soil comprising a stabilization of the soil by conversion of contaminants into a less soluble, mobile or toxic form and, where appropriate, encapsulation of the waste, forming a solid material;
- soil pollution means all forms of pollution, whether chemical, industrial or other, affecting any type of soil, be it agricultural, forestry, urban or other;
- lime means quicklime or slaked lime
- quicklime is understood to mean any calcareous calcination product having variable calcium and magnesium carbonate contents and containing impurities such as clays, in particular calcium oxide (CaO);
- soda lime is understood to mean any type of calcium hydroxide originating from the hydration of quicklime, in particular calcium hydroxide Ca (OH) 2.
- OH calcium hydroxide
- C represents CaO
- F is Fe 2 O 3
- the calcium aluminoferrite phase of a composition corresponding to the general formula CeA x -F actually corresponds to a (Ca0) 6 (Al 2 O 3) x ' (Fe 2 O 3) y' phase.
- the proportions expressed in% correspond to percentages by weight relative to the total weight of the entity (clinker or hydraulic binder) considered.
- the present invention therefore relates to the use of a composition comprising a sulfoaluminous clinker and lime in a polluted soil inerting process.
- the subject of the present invention is the use in a polluted soil inerting process of a composition as described above in which the following characteristics are chosen alone or in combination:
- clinker contains from 5% to 60% of sulphoaluminate phase calcium optionally doped iron C 4 A x F y $ z, preferably from 10% to 60% calcium sulfoaluminate phase optionally doped iron C 4 A x F y $ z ;
- x varies from 2.1 to 2.9, preferably from 2.2 to 2.8;
- y varies from 0.05 to 0.5, preferably 0.1 to 0.5;
- the calcium sulfoaluminate phase contains alumina, iron and sulfur with x varying from 2.1 to 2.9, preferably from 2.2 to 2.8, y varying from 0.05 to 0.5, preferably from 0.1 to 0.5, and z varying from 0.8. at 1.2;
- the clinker contains from 0 to 20% of C 6 A x ' F y calcium aluminoferrite phase;
- the calcium aluminoferrite phase C 6 A X ' F contains alumina and iron with x' varying from 0.65 to 1.3 and y 'ranging from 1.5 to 2.5;
- the clinker contains from 5% to 80% C 2 S belite phase, preferably from 30% to 55% C 2 S belite phase;
- the composition contains from 70% to 99% of sulfoaluminous clinker as described above, preferably from 70% to 98% of sulfoaluminous clinker as described above, more preferably from 75% to 95% of sulfoaluminous clinker as described above; and or the composition further contains a retarding agent to slow down the hydration of the clinker and thus the formation of ettringite, or a setting accelerator to accelerate the hydration of the clinker and the formation of ettringite.
- the setting retarder is chosen from boric acid, citric acid or tartaric acid
- the setting accelerator is chosen from lithium carbonate or sodium carbonate.
- composition used in the context of the present invention may therefore contain quicklime or slaked lime.
- the present invention therefore also relates to the use in a polluted soil inerting process of a composition as described above comprising from 1% to 60% of quicklime, preferably from 1% to 30% of quicklime more preferably from 2% to 30% of quicklime, most preferably from 5% to 25% of quicklime.
- the subject of the present invention is also the use in a polluted soil inerting process of a composition as described above comprising from 1% to 60% slaked lime, preferably from 1% to 30% slaked lime, more preferably 2% to 30% slaked lime, most preferably 5% to 25% slaked lime.
- the clinker according to the invention contains:
- C 2 AS less than 10% of C 2 AS, preferably less than 5% of C2AS.
- composition according to the present invention can be used in any polluted soil inerting process known to those skilled in the art.
- compositions used in the context of the present invention are new.
- present invention also relates to a composition for inerting polluted soil comprising:
- x varies from 2 to 3;
- the subject of the present invention is also a composition for polluted soil inerting, as described previously in which the following characteristics are chosen alone or in combination:
- clinker contains 10 to 50% of sulphoaluminate phase calcium optionally doped iron C 4 A x F y $ z;
- x varies from 2.1 to 2.9, preferably from 2.2 to 2.8;
- y varies from 0.05 to 0.5, preferably 0.1 to 0.5;
- the calcium sulfoaluminate phase contains alumina, iron and sulfur with x varying from 2.1 to 2.9, preferably from 2.2 to 2.8, y varying from 0.05 to 0.5, preferably from 0.1 to 0.5, and z varying from 0.8. at 1.2;
- the clinker contains from 0 to 20% calcium aluminoferrite phase CeA x -F y - with
- the calcium aluminoferrite CeA x -F phase contains alumina and iron with x 'varying from 0.65 to 1.3 and y' varying from 1.5 to 2.5;
- the clinker contains from 30 to 55% of C 2 S belite phase; the composition contains from 70% to 97% sulphoaluminous clinker as described above, more preferably from 75% to 95% sulphoaluminous clinker as described above
- the composition contains from 3% to 30% lime, more preferably from 5% to 25% lime;
- the lime contained in the composition is slaked lime; and or
- the composition further contains a retarding agent to slow down the hydration of the clinker and thus the formation of ettringite, or a setting accelerator to accelerate the hydration of the clinker and the formation of ettringite.
- a retarding agent to slow down the hydration of the clinker and thus the formation of ettringite
- a setting accelerator to accelerate the hydration of the clinker and the formation of ettringite.
- the setting retarder is chosen from boric acid, citric acid or tartaric acid
- the setting accelerator is chosen from lithium carbonate or sodium carbonate.
- the clinker according to the invention contains:
- C 2 AS less than 10% of C 2 AS, preferably less than 5% of C2AS.
- the clinker used in the composition according to the present invention may be prepared by any method known to those skilled in the art.
- the present invention may be illustrated in a nonlimiting manner by the following examples.
- Example 1 Sulphoaluminous clinker used in the context of the present invention
- compositions comprising
- an artificially sulphated silt (clay sand) is used so as to increase its sulphate content beyond the limit value of 1000 mg / kg of dry matter fixed according to the decree in force (Decree of 12 December 2014 on the conditions for the admission of inert waste in installations falling under headings 2515, 2516, 2517 and in inert waste storage facilities falling under heading 2760 of the list of classified installations, OJR No. 0289 of 14 December 2014, page 21032, text No. 11).
- silt is mixed with 2% (w / w) of laboratory gypsum (kneading for 5 min at 140 rpm).
- the composition obtained is reported in the following Table 3.
- the gypsed silt is dry blended with one of the compositions 1 to 4 in a mortar mixer in accordance with the EN 196-3 standard (mixing for 60 seconds at 140 rpm).
- the water (ultrapure) is then added with a water-to-binder ratio of 1. Mixing is then continued for 120s at 140 rpm and then 120 s at 285 rpm.
- the sample thus prepared is stored in a closed plastic bag during the desired ripening time.
- the leaching tests are carried out according to the protocol described in standard NF EN 12457-2, namely
- a leaching test is carried out on the gypsum silt described in point 3.1 "non-inert", which makes it possible to obtain a reference point.
- the sulphate contents in the leachates are measured by ion chromatography according to standard NF EN ISO 10304-1. 3.3.3 - Evaluation of the amount of chromium found in leachates
- Chromium levels in leachates are measured by plasma torch emission spectrometry (ICP) according to standard NF EN ISO 11885.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1851436A FR3077998B1 (en) | 2018-02-20 | 2018-02-20 | USE OF A HYDRAULIC BINDER-BASED COMPOSITION AS PART OF A PROCESS FOR INERTING POLLUTED SOIL |
PCT/FR2019/050367 WO2019162605A1 (en) | 2018-02-20 | 2019-02-19 | Use of a hydraulic binder composition in a method for inerting polluted soil |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3755475A1 true EP3755475A1 (en) | 2020-12-30 |
Family
ID=62222902
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19711961.3A Pending EP3755475A1 (en) | 2018-02-20 | 2019-02-19 | Use of a hydraulic binder composition in a method for inerting polluted soil |
Country Status (5)
Country | Link |
---|---|
US (1) | US20200339881A1 (en) |
EP (1) | EP3755475A1 (en) |
BR (1) | BR112020015027A2 (en) |
FR (1) | FR3077998B1 (en) |
WO (1) | WO2019162605A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3101557B1 (en) | 2019-10-07 | 2023-12-22 | Holcim Technology Ltd | METHOD FOR TREATMENT OF SOIL POLLUTED BY HYDROCARBONS, IN PARTICULAR POLYCYCLIC AROMATIC HYDROCARBONS |
FR3105032B1 (en) | 2019-12-23 | 2022-01-07 | Holcim Technology Ltd | METHOD FOR TREATMENT OF SOIL POLLUTED BY SULFATE |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2940274B1 (en) * | 2008-12-19 | 2011-01-14 | Lafarge Sa | HYDRAULIC BINDER BASED ON CLINKER SULFOALUMINOUS AND CLINKER PORTLAND |
FR2990431B1 (en) * | 2012-05-14 | 2014-10-24 | Francais Ciments | NEW HYDRAULIC BINDER BASED ON CLINKER SULFO-ALUMINUM AND ITS USE IN A PROCESS FOR TREATING POLLUTED SOIL |
FR3003250B1 (en) * | 2013-03-15 | 2016-05-06 | Vicat | NEW SULFO-ALUMINOUS CLINKER WITH LOW CONTENT IN BELITE |
-
2018
- 2018-02-20 FR FR1851436A patent/FR3077998B1/en active Active
-
2019
- 2019-02-19 BR BR112020015027-4A patent/BR112020015027A2/en not_active Application Discontinuation
- 2019-02-19 WO PCT/FR2019/050367 patent/WO2019162605A1/en unknown
- 2019-02-19 EP EP19711961.3A patent/EP3755475A1/en active Pending
- 2019-02-19 US US16/962,094 patent/US20200339881A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
FR3077998A1 (en) | 2019-08-23 |
BR112020015027A2 (en) | 2021-01-19 |
WO2019162605A1 (en) | 2019-08-29 |
US20200339881A1 (en) | 2020-10-29 |
FR3077998B1 (en) | 2022-05-27 |
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