EP0310539A2 - Procédé et dispositif de traitement des cendres volantes - Google Patents

Procédé et dispositif de traitement des cendres volantes Download PDF

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Publication number
EP0310539A2
EP0310539A2 EP88730218A EP88730218A EP0310539A2 EP 0310539 A2 EP0310539 A2 EP 0310539A2 EP 88730218 A EP88730218 A EP 88730218A EP 88730218 A EP88730218 A EP 88730218A EP 0310539 A2 EP0310539 A2 EP 0310539A2
Authority
EP
European Patent Office
Prior art keywords
separation
fly ash
flotation
fraction
carbon
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.)
Withdrawn
Application number
EP88730218A
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German (de)
English (en)
Other versions
EP0310539A3 (fr
Inventor
Karl M. Prof. Dr. Kautz
Eckhard Dr. Weissflog
Jörn Schlichtmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GG Noell GmbH
Original Assignee
GG Noell GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by GG Noell GmbH filed Critical GG Noell GmbH
Publication of EP0310539A2 publication Critical patent/EP0310539A2/fr
Publication of EP0310539A3 publication Critical patent/EP0310539A3/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets
    • B03B9/04—General arrangement of separating plant, e.g. flow sheets specially adapted for furnace residues, smeltings, or foundry slags

Definitions

  • the present invention relates to a method and a device for processing fly ash from incineration plants, in particular fly ash from melting, dry and rust furnaces for hard coal and brown coal with high proportions of residual carbon, sulfates and other admixtures, which are difficult to dispose of or cannot be tested.
  • fly ash In lignite and hard coal-fired power plants, considerable quantities of fly ash are generated, which according to the German Waste Disposal Act are to be initially used and may only be deposited if necessary. The disposal of fly ash is made more difficult by the fact that dry firing is increasingly being used instead of smelting firing and thereby increasing amounts of fly ash are generated, which, like the granulate from melting firing, may not always be temporarily stored or finally stored outdoors.
  • fly ash By increasing the minimum cement content in reinforced concrete in external components, the use of fly ash as a concrete additive continues to decline. It is also known that only certain fly ash can be used in concrete technology at all. Only a part of the fly ash used therefore has a test mark as a concrete additive. Further problems arise from the fact that the fly ash quality depends to a large extent on the types of firing and the mode of operation with full load and part load. After all, the fly ash quality depends to a large extent on the coal used.
  • fly ash in particular is problematic which contains a relatively high proportion of unburned or partially burned carbon particles and not inconsiderable amounts of porous silicate sintered particles.
  • the object of the invention is to utilize fly ash of this type that is critical in terms of concrete technology, or to standardize it in terms of concrete technology. Furthermore, the invention has the task of separating as many valuable and usable components from the fly ash and making them available. The solution to these problems is specified in the claims.
  • DE-PS 890 032 From DE-PS 890 032 it is known to separate fly ash by flotation into a high-carbon and a low-carbon fraction.
  • DE 32 05 385 C2 lists suitable process conditions and aids for the separation of coal from fly ash by flotation.
  • DE 36 28 963 C2 it is proposed to use a flotation aid which can be fed to the fuel of the furnace with the C-rich wet foam product.
  • DE 35 27 179 C1 describes a method for the dry division of hard coal flue dust, which comprises a magnetic separation, several sieves and a multi-stage wind sifting in one device.
  • C-rich components can only be separated out by sieving, i.e. they have to be obtained in a sufficiently large grain size range.
  • fly ash of different origin and composition from the most varied types of incineration plants have shown that it is generally possible to separate disruptive and / or valuable constituents from these fly ash and thus to utilize large portions of the fly ash and to use them without problems.
  • This processing of fly ash according to the invention is carried out by subjecting the ashes, depending on their origin and composition, in succession in a suitable sequence to at least two of the following separation processes: flotation, separation in the hydrocyclone, wet and / or dry magnetic separation, wind separation, wet and / or dry screening, Sink-swim divorce, followed by dewatering, thickening and drying if desired, with the dry magenta separation, dry screening and air separation either before the wet separation process or after drying, followed by grinding if desired.
  • the device for carrying out this method consists of the combination of at least one flotation system, a hydrocyclone, a wet and / or dry magenta separator, an air classifier, a wet and / or dry screening system, a sink-float separator, which can be switched in any order Drainage, thickening and drying and, if necessary, a mill.
  • a device consists of a silo store for the various raw products and silos for the different fractions of dry products, silos for the storage of moist products and a wastewater treatment plant.
  • unburned or partially burned carbon particles are separated off by flotation.
  • These carbon particles obtained during flotation may have the properties of activated carbon and / or activated coke and can therefore be excellent as absorber materials be used.
  • porous, silicate sintered particles, spherical compact particles with a glass-like surface of different grain size and hollow spheres are separated, which can then be separated in the hydrocyclone and / or after dewatering, thickening and drying by air separation. These fractions can be further fractionated by sink-swim divorce and / or sieving.
  • the remaining low-carbon residue, from which the porous, silicate sintered particles and the hollow spheres are separated, can be used, for example, after filtration and drying as a washed fly ash filler, which, depending on the origin of the fly ash, can be low in heavy metals, sulfates and chromate.
  • the hollow spheres (cenospheres) contained in the fly ash are obtained in the hydrocyclone overflow and can be used as an easy-to-fill material.
  • Coarse-grained, medium-grained and fine-grained fractions are obtained both with the wind sifting and with a wet and / or dry screening, which can be used in various ways. If there is an increased demand, in particular for a fine-grained fraction, the coarser-grained fractions of porous sintered particles can, if desired, be subjected to grinding and fractionated again.
  • the very finely divided fractions are particularly suitable for use in concrete technology. However, there are also direct uses of the different fractions, for example as fine grain fillers or coarser fillers.
  • magnetic components such as Fe3O4 in particular can be separated. These parts are interesting as heavy fillers and often contain enriched rare earth metals. This magnetically separated fraction can thus be marketed well and removes constituents that are questionable in terms of concrete technology from the rest of the fly ash.
  • the flotation and the other wet separation steps are carried out with water.
  • the method according to the invention is particularly suitable for fly ash with a relatively high content of unburned or partially burned carbon particles and / or a high content of porous, silicate sintered particles and / or a high content of hollow spheres and / or a high content of magnetically separable parts as well as fly ash a wide range of grain size distribution.
  • wastewater treatment is generally also carried out.
  • any dissolved or finely suspended portions can be separated, which in turn contain valuable components and / or can be sent for separate recycling.
  • Fly ash is located in silos 1, 2, 3, 4, e.g. Silo 1 contains C-poor fly ash, the carbon content of which is approximately 1 to 4%, while C-rich fly ash can have a carbon content of approximately 10% and more.
  • the fly ash optionally after mixing, passes through a magnetic separator 5 in which the iron oxide fraction is largely separated.
  • Industrial studies have shown that at least 2/3 of the magnetic fraction contains an iron oxide Content of 60 to 70% can be obtained.
  • the magenta separation can be carried out dry or wet and optionally also wet in two stages or dry in several stages.
  • the magnetic fraction the proportion of which in the fly ash is less than 5% by weight to more than 10% by weight, can be used after screening and possibly further treatment, for example as a heavy filler in the field of corrosion protection and pigments.
  • At least the fly ash with a higher carbon content is subjected to flotation 6, in which washing is also carried out.
  • a two-stage flotation process with pneumatic flotation in the first stage is preferred.
  • Pneumatic flotation is also possible in the second stage, but pressure relaxation flotation can also be used here and can be more advantageous in certain cases.
  • the flotation turns the remaining amount after the magnetic separation into a C-poor fraction with up to 1% carbon and a proportion of about 90 to 97% by weight and a C-rich fraction with a carbon content of about 60% and more with a Share of about 3 to more than 10% by weight of the remaining amount after the magnetic separation.
  • a further division of the flotation residue after it has dried can e.g.
  • the C-rich fraction separated by the flotation is suitable after further treatment by preferably current drying and classifying for use as an absorber material, for foundry and molding sand or as a fuel.
  • the dried C-poor portion is suitable for use in concrete, for example, and after classification can be used as a test mark fly ash.
  • Magnetic separation can also follow the flotation and is preferably used only for the C-poor fraction.
  • Flotation treatment is not required if the starting material is C-low fly ash e.g. from silo 1 is available.
  • the starting material is C-low fly ash e.g. from silo 1 is available.
  • multi-stage wind sifting 11 into fractions of e.g. less than 0.01 mm, 0.01 to 0.04 mm and over 0.04 mm.
  • the C-poor fly ash or the C-poor fraction separated by flotation is expediently passed through one or preferably two hydrocyclones 7 and is further divided here, in particular according to the grain size.
  • a separation of the fine material with grain sizes of e.g. less than about 0.01 mm With this separation, however, larger hollow spheres (cenospheres) remain with the otherwise compact fine material.
  • the fly ash contains cenospheres with 0.1 to 1.2% by weight, the diameter of which can be up to 1 mm.
  • the coarser underflow of the first stage is fed to the hydrocyclones for reclassification of the second stage.
  • the fine fraction which is obtained as a cyclone overflow of the first stage, is passed over at least a sieve 8 of, for example, 0.04 or 0.045 mm or a sink-float separator for the selection of the hollow spheres.
  • a sieve 8 of, for example, 0.04 or 0.045 mm or a sink-float separator for the selection of the hollow spheres.
  • the hollow spheres of, for example, more than 0.09 mm can also be separated using a further sieve.
  • the hollow spheres are dewatered, thickened and dried in a drying step 9. This can be done, for example, in a thickener using filter presses and on a belt dryer.
  • the cenospheres can be used as light fillers for plastics and building materials, such as casting compounds and lightweight plastic concrete.
  • the fine material obtained in the screening 8 or a similar separation treatment with a grain size below 0.04 mm and preferably with a grain size substantially below 0.01 mm is dewatered, thickened and dried in a drying step 10.
  • This material which essentially consists of the spherical particles with a glass-like surface, may be suitable after further treatment as a fine-grained filler for certain areas in plastics, rubber, cable casting compounds, emulsion paints, etc.
  • the fines of up to about 0.01 mm still separated in the second stage of the hydrocyclones 7 can be returned to the first stage to increase the fines yield.
  • the coarse-grained material from the hydrocyclones which consists of spherical particles and porous sintered particles with grain sizes over 0.01 mm, in particular over 0.04 mm, can be separated into these two types of particles by a sink-float separation and is dried separately. If a particle type still has a higher carbon content, it may be expedient to feed this coarser material to the flotation 6 wet.
  • the coarse-grained porous sintered particles can optionally be used after grinding as a concrete additive and as additives for underbody protection and in construction chemistry for spraying and casting compounds and for adhesives.
  • the final division into at least three fractions of, for example, less than 0.01 mm, 0.01 to 0.04 mm and more than 0.04 mm takes place.
  • the individual fractions are fed to the silos 12, 13, 14. Additional silos 15, 16 for the intermediate storage or reception of the end products can be provided.
  • At least a silo 17 picks up the separated cenospheres.
  • a container 18 can be provided for the storage of moist products.
  • a so-called co-current wind classifier according to DE 36 04 450 C1 is also suitable as the air classifier, which enables a division into a larger number of particle size ranges.
  • the water obtained at various points in the process is recycled as far as possible, for example from wet sieving 8 to hydrocyclone 7 or to flotation 6.
  • a wastewater treatment unit 19 is necessary, in which the 1 to 2% in Waste water contained residues are separated before the water can be introduced into a receiving water 20 or returned to the flotation 6.
  • the flow diagram shown shows some possibilities for treating fly ash of different composition and origin, in order to prepare at least parts of the fly ash for a suitable use, so that any remaining amount to be deposited becomes as small as possible.
  • the diagram contains further details necessary for the operation, e.g. Pumps or functional devices such as a mill and the sink-swim divorce are not specified.

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  • Processing Of Solid Wastes (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP88730218A 1987-10-02 1988-09-27 Procédé et dispositif de traitement des cendres volantes Withdrawn EP0310539A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3733334 1987-10-02
DE19873733334 DE3733334C2 (de) 1987-10-02 1987-10-02 Verfahren und Vorrichtung zur Aufbereitung von Flugaschen

Publications (2)

Publication Number Publication Date
EP0310539A2 true EP0310539A2 (fr) 1989-04-05
EP0310539A3 EP0310539A3 (fr) 1990-05-16

Family

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Family Applications (1)

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EP88730218A Withdrawn EP0310539A3 (fr) 1987-10-02 1988-09-27 Procédé et dispositif de traitement des cendres volantes

Country Status (3)

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EP (1) EP0310539A3 (fr)
DE (1) DE3733334C2 (fr)
DK (1) DK546788A (fr)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0440993A1 (fr) * 1990-02-05 1991-08-14 Multi Minerals Méthode et dispositif pour récupérer, à partir de matériaux résiduels, des produits pour un traitement ultérieur
US5047145A (en) * 1990-05-24 1991-09-10 Board Of Control Of Michigan Technological University Wet process for fly ash beneficiation
WO1992004296A1 (fr) * 1990-09-11 1992-03-19 Armines Procede pour ameliorer les performances et la durabilite des betons
US5227047A (en) * 1990-05-24 1993-07-13 Board Of Control Of Michigan Technological University Wet process for fly ash beneficiation
WO1994021391A1 (fr) * 1993-03-08 1994-09-29 Anthony Gilbert Martin Procede perfectionne ne nuisant pas a l'environnement de manipulation et d'utilisation d'effluents de combustion du charbon dans les grands sites industriels
FR2727639A1 (fr) * 1994-12-02 1996-06-07 Mediterranee Const Ind Procede de traitement des residus de l'epuration des fumees d'incineration d'ordures menageres et de dechets industriels et installation pour la mise en oeuvre de ce procede
EP1185354A4 (fr) * 1998-10-07 2003-02-05 Control For Michigan Technolog Utilisation du carbone non brule des sous-produits de combustion pour lutter contre les emissions de mercure
US6695902B2 (en) 2000-11-14 2004-02-24 Boral Material Technologies, Inc. Asphalt composites including fly ash fillers or filler blends, methods of making same, and methods for selecting or modifying a fly ash filler for use in asphalt composites
WO2006030224A1 (fr) * 2004-09-15 2006-03-23 Hanson Building Products Limited Traitement de cendres volantes
CN101870896A (zh) * 2009-08-11 2010-10-27 章新喜 气化炉灰渣中碳的回收方法
US7879144B2 (en) 2000-11-14 2011-02-01 Boral Material Technologies Inc. Filler comprising fly ash for use in polymer composites
EP3045815A1 (fr) * 2015-01-14 2016-07-20 Gremot Stracke Procede et dispositif de preparation de cendres d'une installation d'incineration de dechets
CN107029868A (zh) * 2017-06-16 2017-08-11 鞍钢集团矿业有限公司 一种混合矿高压辊磨、双介质，磁‑赤矿分选工艺
EP2613885A4 (fr) * 2007-10-19 2018-04-18 Micropulva Ltd. Oy Procédé pour le raffinage de cendre de houille par séparation d'un produit carboné et régénération de produits de cendre siliceuse et utilisation d'un produit carboné produit par le procédé
CN110479467A (zh) * 2019-08-28 2019-11-22 马钢集团设计研究院有限责任公司 一种贫磁铁矿石的高压辊磨干式筛分湿式预选工艺
CN112156885A (zh) * 2020-08-17 2021-01-01 中国矿业大学 一种回收合格介质中粗煤泥的工艺

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4135368A1 (de) * 1991-10-26 1993-07-29 Preussag Ag Verfahren zur aufbereitung von filterstaeuben, insbesondere aus abfallverbrennungsanlagen
DE4406714A1 (de) * 1994-02-25 1995-08-31 Bernhard Dipl Ing Zinke Verfahren zur Absorption von organischen umweltbelasteten Schadstoffen
DE19605546C2 (de) * 1996-02-15 1998-04-16 Karl Heinz Kies Verfahren und Vorrichtung zum Abscheiden abgestrahlter Teilchen aus Strahlmitteln
DE10120837C1 (de) * 2001-04-27 2002-06-06 Mac Mix Baustoffe Gmbh & Co Kg Verfahren zur Herstellung eines Betonzusatzstoffes unter Verwendung von Flugaschen

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE890032C (de) * 1943-05-06 1953-09-17 Wolf Dr-Ing Straetling Verfahren zur Behandlung von Flugasche von Kraftwerken und aehnlichen Verbrennungsanlagen
US4121945A (en) * 1976-04-16 1978-10-24 Amax Resource Recovery Systems, Inc. Fly ash benificiation process
US4425228A (en) * 1982-03-02 1984-01-10 Bethlehem Steel Corporation Wet-classifying method for recovery of carbon and iron-bearing particles
DE3527179C1 (de) * 1985-07-30 1986-12-18 Thomas 4400 Münster Holzapfel Verfahren zur trockenen Auftrennung von Steinkohlenflugstäuben und Vorrichtung zur Durchführung des Verfahrens
US4652433A (en) * 1986-01-29 1987-03-24 Florida Progress Corporation Method for the recovery of minerals and production of by-products from coal ash
DE3721252A1 (de) * 1987-06-27 1989-01-19 Gfr Aufbereitung Reststoffe Verfahren zur herstellung von absorber-materialien

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0440993A1 (fr) * 1990-02-05 1991-08-14 Multi Minerals Méthode et dispositif pour récupérer, à partir de matériaux résiduels, des produits pour un traitement ultérieur
US5047145A (en) * 1990-05-24 1991-09-10 Board Of Control Of Michigan Technological University Wet process for fly ash beneficiation
US5227047A (en) * 1990-05-24 1993-07-13 Board Of Control Of Michigan Technological University Wet process for fly ash beneficiation
WO1992004296A1 (fr) * 1990-09-11 1992-03-19 Armines Procede pour ameliorer les performances et la durabilite des betons
WO1994021391A1 (fr) * 1993-03-08 1994-09-29 Anthony Gilbert Martin Procede perfectionne ne nuisant pas a l'environnement de manipulation et d'utilisation d'effluents de combustion du charbon dans les grands sites industriels
FR2727639A1 (fr) * 1994-12-02 1996-06-07 Mediterranee Const Ind Procede de traitement des residus de l'epuration des fumees d'incineration d'ordures menageres et de dechets industriels et installation pour la mise en oeuvre de ce procede
EP1185354A4 (fr) * 1998-10-07 2003-02-05 Control For Michigan Technolog Utilisation du carbone non brule des sous-produits de combustion pour lutter contre les emissions de mercure
AU774284B2 (en) * 1998-10-07 2004-06-24 Board Of Control Of Michigan Technological University Control of mercury emissions using unburned carbon from combustion by-products
US6695902B2 (en) 2000-11-14 2004-02-24 Boral Material Technologies, Inc. Asphalt composites including fly ash fillers or filler blends, methods of making same, and methods for selecting or modifying a fly ash filler for use in asphalt composites
US7879144B2 (en) 2000-11-14 2011-02-01 Boral Material Technologies Inc. Filler comprising fly ash for use in polymer composites
GB2436024A (en) * 2004-09-15 2007-09-12 Hanson Building Products Ltd Processing of pulverised fuel ash
GB2436024B (en) * 2004-09-15 2010-04-28 Hanson Building Products Ltd Processing of pulverised fuel ash
WO2006030224A1 (fr) * 2004-09-15 2006-03-23 Hanson Building Products Limited Traitement de cendres volantes
EP2613885A4 (fr) * 2007-10-19 2018-04-18 Micropulva Ltd. Oy Procédé pour le raffinage de cendre de houille par séparation d'un produit carboné et régénération de produits de cendre siliceuse et utilisation d'un produit carboné produit par le procédé
CN101870896A (zh) * 2009-08-11 2010-10-27 章新喜 气化炉灰渣中碳的回收方法
CN101870896B (zh) * 2009-08-11 2015-04-01 章新喜 气化炉灰渣中碳的回收方法
EP3045815A1 (fr) * 2015-01-14 2016-07-20 Gremot Stracke Procede et dispositif de preparation de cendres d'une installation d'incineration de dechets
CN107029868A (zh) * 2017-06-16 2017-08-11 鞍钢集团矿业有限公司 一种混合矿高压辊磨、双介质，磁‑赤矿分选工艺
CN110479467A (zh) * 2019-08-28 2019-11-22 马钢集团设计研究院有限责任公司 一种贫磁铁矿石的高压辊磨干式筛分湿式预选工艺
CN112156885A (zh) * 2020-08-17 2021-01-01 中国矿业大学 一种回收合格介质中粗煤泥的工艺
CN112156885B (zh) * 2020-08-17 2021-11-30 中国矿业大学 一种回收合格介质中粗煤泥的工艺

Also Published As

Publication number Publication date
DE3733334C2 (de) 1994-12-22
DE3733334A1 (de) 1989-04-13
DK546788D0 (da) 1988-09-30
DK546788A (da) 1989-04-03
EP0310539A3 (fr) 1990-05-16

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