EP0397649A1 - Method for improving the concrete-technical properties of fly ash - Google Patents
Method for improving the concrete-technical properties of fly ashInfo
- Publication number
- EP0397649A1 EP0397649A1 EP88907697A EP88907697A EP0397649A1 EP 0397649 A1 EP0397649 A1 EP 0397649A1 EP 88907697 A EP88907697 A EP 88907697A EP 88907697 A EP88907697 A EP 88907697A EP 0397649 A1 EP0397649 A1 EP 0397649A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ash
- fractions
- weight
- additive
- concrete
- 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- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000010881 fly ash Substances 0.000 title claims abstract description 9
- 239000002956 ash Substances 0.000 claims abstract description 39
- 239000000654 additive Substances 0.000 claims abstract description 11
- 230000000996 additive effect Effects 0.000 claims abstract description 11
- 239000003546 flue gas Substances 0.000 claims abstract description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229920001732 Lignosulfonate Polymers 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims abstract description 4
- 239000004449 solid propellant Substances 0.000 claims abstract description 3
- 235000002918 Fraxinus excelsior Nutrition 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 6
- 239000004117 Lignosulphonate Substances 0.000 claims description 3
- 230000000717 retained effect Effects 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 10
- 238000001914 filtration Methods 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 abstract 1
- 238000011144 upstream manufacturing Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 235000019357 lignosulphonate Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
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
- C04B18/08—Flue dust, i.e. fly ash
-
- 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 concerns a method for improving the properties of fly ash produced in the burn ⁇ ing of solid fuels, so as to make the ash better suitable for an additive for concrete.
- the fly ash is usually re ⁇ moved from the flue gases of a combustion plant by means of electric filters or other suitable filter and separa ⁇ tion apparatuses.
- the ash separated in this way, in par ⁇ ticular the ash produced on combustion of coal, has been used as an additive for concrete, partly to substitute for the binder material in concrete.
- the fly ash also includes fractions that reduce the effect of the ad ⁇ vantageous • fractions when used in concrete and may even suppress said effects completely.
- a particular problem has been the variation of the proportion of the harmful frac ⁇ tions in relation to the advantageous fractions, which va ⁇ riation results, e.g., from the operating conditions of the combustion plant. The variations may be considerable even within one combustion plant, but in particular ashes obtained from different combustion plants cause inpredict- able problems when they are used for concrete products to ⁇ gether.
- a coarse fraction of the ash is separated from the ashes so that in the ash to be recovered, at the maximum, approximately 50 % of the weight of the ashes consist of a fraction that is retained on a screen of 45 ⁇ m, and the recovered ash is divided into at least two fractions of different grades of coarse ⁇ ness, to which Na- or Ca-lignosulphonate is added at the rate of about 0.1 to 2.5 % of the weight of the ash so that the total quantity of the addition is distributed among the ash fractions of different grades of coarseness substantially at a weight ratio proportional to their average particle sizes.
- the fol ⁇ lowing procedure has proved the simplest one.
- a coarse fraction is removed from the flue gas prior to the electric filtration so that the ash separated at the electric filters yields a screening result, wherein the
- the method of the invention has proved partic ⁇ ularly suitable for the treatment of fly ash produced on combustion of coal, but it is also suitable for the treat ⁇ ment of ash produced on combustion of peat as well as on combustion of bituminous shale, when the ash is processed so as to make it suitable for an additive for concrete.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Ceramic Engineering (AREA)
- Combustion & Propulsion (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI873768A FI873768A (fi) | 1987-08-31 | 1987-08-31 | Foerfarande foer att foerbaettra de betongtekniska egenskaperna hos flygaska fraon stenkolsfoerbraenning. |
| FI873768 | 1987-08-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0397649A1 true EP0397649A1 (en) | 1990-11-22 |
Family
ID=8524971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88907697A Withdrawn EP0397649A1 (en) | 1987-08-31 | 1988-08-31 | Method for improving the concrete-technical properties of fly ash |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0397649A1 (fi) |
| DK (1) | DK51290D0 (fi) |
| FI (1) | FI873768A (fi) |
| WO (1) | WO1989001917A1 (fi) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1016972C2 (nl) * | 2000-12-22 | 2002-06-25 | Duos B V | Werkwijze en tuimelzeefmachine voor het scheiden van fijne deeltjes. |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1165897A (en) * | 1965-10-05 | 1969-10-01 | John Mchenry | Pellet-Hardening Method |
| DE3411010A1 (de) * | 1983-03-26 | 1984-09-27 | Herbert Keller GmbH & Co, 4600 Dortmund | Verwendung von flugstaub als zusatzstoff fuer beton |
-
1987
- 1987-08-31 FI FI873768A patent/FI873768A/fi not_active IP Right Cessation
-
1988
- 1988-08-31 WO PCT/FI1988/000139 patent/WO1989001917A1/en not_active Application Discontinuation
- 1988-08-31 EP EP88907697A patent/EP0397649A1/en not_active Withdrawn
-
1990
- 1990-02-27 DK DK51290A patent/DK51290D0/da not_active Application Discontinuation
Non-Patent Citations (1)
| Title |
|---|
| See references of WO8901917A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1989001917A1 (en) | 1989-03-09 |
| FI873768A0 (fi) | 1987-08-31 |
| DK51290A (da) | 1990-02-27 |
| DK51290D0 (da) | 1990-02-27 |
| FI873768A (fi) | 1989-03-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 19900227 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19910301 |