WO1997041080A1 - Methode de traitement de residus solides de la purge des systemes d'epuration des gaz par voie humide - Google Patents
Methode de traitement de residus solides de la purge des systemes d'epuration des gaz par voie humide Download PDFInfo
- Publication number
- WO1997041080A1 WO1997041080A1 PCT/FR1997/000777 FR9700777W WO9741080A1 WO 1997041080 A1 WO1997041080 A1 WO 1997041080A1 FR 9700777 W FR9700777 W FR 9700777W WO 9741080 A1 WO9741080 A1 WO 9741080A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- blowoff
- purge
- mixer
- wet
- solid
- Prior art date
Links
Classifications
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/062—Purification products of smoke, fume or exhaust-gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/73—After-treatment of removed components
-
- 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
- C04B28/04—Portland cements
-
- 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
- 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 processes for the purification of gases by the wet route, and more particularly to the treatment of solid residues by salt purges generated by such processes.
- This deconcentration purge is treated in a water treatment installation leading, on the one hand, to a solid residue often called a filter cake which contains the solid particles captured in the washer as well as the compounds precipitated during the neutralization of the acid compounds and during the treatment of the purge and other bet in a rejection of purified water containing the salts remained soluble during the neutralization and the treatment of the purge.
- a solid residue often called a filter cake which contains the solid particles captured in the washer as well as the compounds precipitated during the neutralization of the acid compounds and during the treatment of the purge and other bet in a rejection of purified water containing the salts remained soluble during the neutralization and the treatment of the purge.
- This is particularly the case for calcium chloride, sodium chloride and sodium sulfate.
- a first solution consists in evaporating this rejection by crystallizing the salts which can be reused in industry. This of course requires a very effective and therefore expensive water treatment.
- the evaporated water is condensed and returned to the washer as make-up water.
- I t is a question of limiting both the overall soluble fraction (therefore the soluble salts) and specific fractions, especially heavy metals.
- Another solution consists in no longer purifying the gases by the wet route but by the dry or semi-dry route. In the dry process, a solid powdered reagent is injected into the smoke, for example slaked lime.
- This powder reacts with acidic compounds and is captured with fly ash in a bag filter or an electro-filter placed downstream of the injection point.
- the gas-solid reaction is less efficient than the wet reaction, part of the reagent remains unused and therefore increases the amount of residues.
- the solid residue obtained is composed of fly ash, neutralization compounds and excess reagent. This solid residue must be stabilized before being stored in a landfill, which represents a high stabilization and landfill cost.
- the procedure is analogous by injecting a concentrated solution of reagent into a spray dryer where the gases to be purified are brought into contact with the atomized reagent in fine droplets. These are dried by evaporation with the gases to be purified.
- the reaction between the reagent and the acidic compounds is improved and a baghouse filter or electrostatic precipitator placed downstream collects the fly ash, the reaction products and the unreacted reagent.
- the solid residue thus obtained is analogous to that obtained by the dry route; it also poses the same technical and economic problem.
- the present invention aims to eliminate the drawbacks of known methods by combining the intrinsically superior performance of wet systems with a total absence of water discharge. It represents a major advance in that it combines two wastes, one solid and the other liquid, each requiring treatment to make it a stabilized residue capable of being directly landfilled.
- the process is characterized in that: a) incorporating, for example. in a high-energy mixer, the solids to be stabilized, additives allowing solidification, for example. hydraulic binders, and b) water coming at least partly from the concentration up to a content of between 30 and 70% of water, eg. by evaporation, saline liquid purges from the wet system.
- FIG. 1 gives a schematic representation of the process which is the subject of the invention.
- a high energy mixer (5) which can be a vertical axis mixer of a type known for the manufacture of concrete.
- the purges (8) of the wet treatment system (13) are previously neutralized in a tank (14) using a neutralizing agent (1 1) so as to give a flow (10) which will be concentrated in a unit (9) which can be an evaporator so as to give a flow (2) which contains all of the
- the wet cleaning system (13) purifies gases from acid compounds such as HC1. HF, S0 2 .
- a neutralizing reagent is generally injected into the washing line, except possibly in the case of highly soluble acid gases such as HCl.
- a deconcentration purge, most often acid, makes it possible to extract the salts and other compounds trapped in the washer. According to the invention, this purge is not treated with a view to rejection into the aquatic environment, but it is simply neutralized with a reagent (1 1) preferably chosen from the family of hydroxides of alkali or alkaline earth metals, alkali or alkaline earth carbonates or hydrogen carbonates, reagent which can be the same as that used in the wet scrubber.
- a complexing agent (12) can be added to improve the characteristics of the final product (7) with regard to leaching.
- the neutralized purge is brought to a water concentration of between 30 to 70% of water by weight, and preferably from 40 to 60%, in a unit (9) for example consisting of a evaporator, so as to be able to introduce this liquid which contains all of the salts from the purge (8) into the mixing device (5), as part or all of the water necessary for the incorporation and stabilization.
- This incorporation and stabilization step is carried out for example in a mixer, for example of the planetary and high energy type, which receives on the one hand solid residues to be stabilized (1) and the liquid (2) from the concentration step above and on the other hand, any additives (3) (for example lime, sand or the like), a hydraulic binder (3) (for example Portland cement with a proportion of between 0.2 at 0.8 kg per kg of residue) and any additional water (2a).
- a mixer for example of the planetary and high energy type, which receives on the one hand solid residues to be stabilized (1) and the liquid (2) from the concentration step above and on the other hand, any additives (3) (for example lime, sand or the like), a hydraulic binder (3) (for example Portland cement with a proportion of between 0.2 at 0.8 kg per kg of residue) and any additional water (2a).
- any additives (3) for example lime, sand or the like
- a hydraulic binder (3) for example Portland cement with a proportion of between 0.2 at 0.8 kg per kg of residue
- the calcium chloride generated during neutralization also provides a beneficial effect when the solidification stage solidifies.
- Fly ash collected by the dust extractor electrostatic filter located upstream of the wet scrubber must be stabilized taking into account their soluble fraction and usefully constitute the solid residue (1) to be stabilized.
- the evaporation step is not necessary and may be omitted.
- the neutralized purge (10) is directly supplied with (5), in full.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Inorganic Chemistry (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Combustion & Propulsion (AREA)
- Civil Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97921918A EP0896573A1 (fr) | 1996-04-30 | 1997-04-30 | Methode de traitement de residus solides de la purge des systemes d'epuration des gaz par voie humide |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9605739A FR2747946B1 (fr) | 1996-04-30 | 1996-04-30 | Methode de traitement de residus solides par la purge des systemes d'epuration des gaz par voie humide |
FR96/05739 | 1996-04-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997041080A1 true WO1997041080A1 (fr) | 1997-11-06 |
Family
ID=9491942
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1997/000777 WO1997041080A1 (fr) | 1996-04-30 | 1997-04-30 | Methode de traitement de residus solides de la purge des systemes d'epuration des gaz par voie humide |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0896573A1 (fr) |
FR (1) | FR2747946B1 (fr) |
WO (1) | WO1997041080A1 (fr) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2228529A1 (fr) * | 1973-05-10 | 1974-12-06 | Hoelter H | |
FR2252998A1 (en) * | 1973-11-29 | 1975-06-27 | Iu Conversion Systems | Hardened cement material from coal flue gases - scrubbed with alkaline earth hydroxide, giving suspension of fly-ash and alkaline earth hydroxide and sulphite |
DE2624484A1 (de) * | 1976-06-01 | 1977-12-15 | Hutter Gmbh & Co Kg S | Verfahren zur aufbereitung und vernichtung von bei der nassreinigung der heizflaechen von dampferzeugern und bei der rauchgasreinigung anfallenden schlammfuehrenden reinigungsabwaessern und von daraus abgezogenem schlamm |
US4134774A (en) * | 1976-03-04 | 1979-01-16 | Steag Aktiengesellschaft | Aggregate for concrete and concrete composition containing same |
US4969932A (en) * | 1986-12-22 | 1990-11-13 | Shell Oil Company | Flyslag treatment utilizing a solids-containing concentrated aqueous stream and a cementitious material |
DE4107927A1 (de) * | 1991-03-08 | 1992-09-10 | Noell K & K Abfalltech | Verfahren zur immobilisierung von schadstoffhaltigen rueckstaenden aus der rauchgasreinigung |
-
1996
- 1996-04-30 FR FR9605739A patent/FR2747946B1/fr not_active Expired - Fee Related
-
1997
- 1997-04-30 EP EP97921918A patent/EP0896573A1/fr not_active Ceased
- 1997-04-30 WO PCT/FR1997/000777 patent/WO1997041080A1/fr not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2228529A1 (fr) * | 1973-05-10 | 1974-12-06 | Hoelter H | |
FR2252998A1 (en) * | 1973-11-29 | 1975-06-27 | Iu Conversion Systems | Hardened cement material from coal flue gases - scrubbed with alkaline earth hydroxide, giving suspension of fly-ash and alkaline earth hydroxide and sulphite |
US4134774A (en) * | 1976-03-04 | 1979-01-16 | Steag Aktiengesellschaft | Aggregate for concrete and concrete composition containing same |
DE2624484A1 (de) * | 1976-06-01 | 1977-12-15 | Hutter Gmbh & Co Kg S | Verfahren zur aufbereitung und vernichtung von bei der nassreinigung der heizflaechen von dampferzeugern und bei der rauchgasreinigung anfallenden schlammfuehrenden reinigungsabwaessern und von daraus abgezogenem schlamm |
US4969932A (en) * | 1986-12-22 | 1990-11-13 | Shell Oil Company | Flyslag treatment utilizing a solids-containing concentrated aqueous stream and a cementitious material |
DE4107927A1 (de) * | 1991-03-08 | 1992-09-10 | Noell K & K Abfalltech | Verfahren zur immobilisierung von schadstoffhaltigen rueckstaenden aus der rauchgasreinigung |
Also Published As
Publication number | Publication date |
---|---|
FR2747946B1 (fr) | 1998-07-17 |
EP0896573A1 (fr) | 1999-02-17 |
FR2747946A1 (fr) | 1997-10-31 |
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