CN1373102A - Process for chemically pretreating wet-discharged flyash - Google Patents
Process for chemically pretreating wet-discharged flyash Download PDFInfo
- Publication number
- CN1373102A CN1373102A CN01109093A CN01109093A CN1373102A CN 1373102 A CN1373102 A CN 1373102A CN 01109093 A CN01109093 A CN 01109093A CN 01109093 A CN01109093 A CN 01109093A CN 1373102 A CN1373102 A CN 1373102A
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- Prior art keywords
- wet
- coal ash
- discharged coal
- powder
- discharged
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- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
- Road Paving Structures (AREA)
Abstract
A process for chemically pretreating the discharged wet flyash includes adding the activating additive (such as chemical gypsum and carbide slags), rolling-mixing and static ageing. Its advantages are widening the application range of flyash in road and building material, use of industrial waste, and low cost.
Description
The present invention relates to the technology category of coal-burning power plant's wet-discharged coal ash comprehensive utilization, specifically, relate to the chemically pretreating process of wet-discharged coal ash.
As everyone knows, China is a coal fired power generation big country, and every year, up to 100,000,000 tons/year, wherein 30% was dry discharge fly ash, now successfully is applied in commerical ready-mixed concrete and the manufacture of cement by the powdered coal cinder total amount of power plant emission now.Other 70% is wet-discharged coal ash, is applied to except that small part the products such as road mixture, flyash brick, and most of wet-discharged coal ash is had to leave in the storage ash field.It is costly to build storage ash field, and need occupy large stretch of soil.In the deposition process of wet-discharged coal ash after entering storage ash field, part moisture causes groundwater pollution to underground infiltration.And, be deposited on the flyash upper layer dehydration of storage ash after, thin ash wherein is easy to kick up with the wind, thereby causes the serious atmospheric dust pollution in peripheral region, destroys human ecotope.Therefore, exploitation enlarges the attention that comprehensive utilization wet-discharged coal ash resource has obtained governments at all levels.
Flyash belongs to volcanic ash class active substance, in the system of flyash place, exist simultaneously under the condition of moisture and calcium hydroxide, the outer surface layer of flyash particle is aquation at first, generate electronegative manosil AS root anion radical, the calcium ion that is generated by the calcium hydroxide dissolving in the absorption has promptly been finished hydro-thermal reaction, generates one deck C-S-H gel around the flyash particle, this C-S-H gel has the hydraulicity, thereby it is that formation is built the road, the key ingredient of building materials field product strength.The ability that academia participates in hydro-thermal reaction to flyash calls pozzolanic activity.Wet-discharged coal ash is applied to build the road ultimate principle in producing with compound and flyash brick that Here it is.Utilizing wet-discharged coal ash production road mixture and flyash brick is the main path of the wet-discharged coal ash of exploitation comprehensive utilization at present.For example, utilize in the road mixture of wet-discharged coal ash for raw material existing, its volume prescription is a rubble: wet-discharged coal ash: lime material=3: 2: 1.This in advance at the uniform compound of plant mix, generally be layered on the basic unit of road, after rolling in fact, repave bituminous pavement above, rely between wet-discharged coal ash and the lime powder hydro-thermal reaction slowly takes place, generate the C-S-H gel of the hydraulicity, make roadbed form certain intensity and anti-water penetrating power gradually.
Wet-discharged coal ash is in the long period of soaking process of water, electronegative after the flyash particle surface layer aquation, be easy to go up other impurity cationoid and passivation from external world's absorption, utilize afterwards wet-discharged coal ash build the road for raw material production and the building material product process in, the ability that hydro-thermal reaction takes place when running into calcium hydroxide will reduce.Therefore, the pozzolanic activity of wet-discharged coal ash is starkly lower than the dry discharge fly ash with fineness.Wet-discharged coal ash mainly is the lime-ash by three kinds of different fineness components, i.e. the mixing friend of II level ash, III level ash and furnace bottom ash composition.II level ash originates from the boiler of power plant flue gas, is collected and is poured in the wet-discharged coal ash by water by electric precipitator.II level ash mainly is made up of the globular glass body microballon of particle diameter 1-100 μ m, its fineness scope is that the 0.045mm square hole sieve tails over 12-20%, so II level ash is the highest component of fineness in the wet-discharged coal ash, owing to have higher specific surface area, thereby pozzolanic activity is also the highest.III level ash also originates from the boiler of power plant flue gas, is collected and is poured in the wet-discharged coal ash by water by electric precipitator.III level ash mainly is made up of the bigger irregular vitreum of granularity, and the fineness scope is that the 0.045mm square hole sieve tails over 20-45%, thereby its pozzolanic activity is lower than II level ash.The furnace bottom slag is the boiler of power plant product after the slag fused shrend, and particle diameter is generally greater than III level ash, thereby pozzolanic activity is minimum.Because the ratio random variation is quite big between II level ash, III level ash and the furnace bottom slag three in the wet-discharged coal ash, so compare with dry discharge fly ash, the pozzolanic activity of wet-discharged coal ash is not only lower, and fluctuation is also bigger.Here it is cause wet-discharged coal ash build the road and products production such as brickmaking in the important factor of quality problems appears, also to be wet-discharged coal ash building the road, failing in the field such as building materials the basic reason that large-scale development uses for this.
Purpose of the present invention is exactly the chemically pretreating process that a kind of wet-discharged coal ash will be provided, and solves the shortcoming that the wet-discharged coal ash pozzolanic activity is lower and fluctuation is bigger, makes it building the road, obtaining large-scale development in the field such as building materials and use.
The concrete steps that realize wet-discharged coal ash Chemical Pretreatment of the present invention are:
1. the activation adulterant selects for use
(1) lime powder: select for use f-CaO＞60%, MgO＜5%, fineness to reach the 0.08mm square hole sieve to tail over＜10%, digestion time is no more than 5 minutes fast construction lime powder.Or select moisture＜30% for use, Ca in the butt (OH)
2＞80% carbide slag comes the replacing lime powder.
(2) terra alba: select SO for use
3 2-＞30%, fineness reaches the 0.08mm square hole sieve and tails over＜10% natural dihydrate gypsum powder.Or select SO in moisture＜30%, the butt for use
3 2-＞30% chemical gypsum comprises that desulfurated plaster, phosphogypsum, fluorgypsum, citric acid gypsum replace the natural dihydrate gypsum powder.
(3) crystal seed: select for use fineness to reach the 0.08mm square hole sieve to tail over＜10% calcite in powder is as crystal seed.Or adopt ground dolomite to replace calcite in powder.
2. the batching of wet-discharged coal ash compound
Prepare (weight) % by following proportioning: wet-discharged coal ash 70-90; Lime powder 5-20; Natural dihydrate gypsum powder 3-15; Calcite in powder 1-10.
Ratio of water to material is 0.2-0.4.
3. roll combination treatment
Rolling combination treatment in measured various raw materials of scale and the batching water adding wet type rolling mixing machine, material is uniformly mixed.
4. still aging processing
It is to leave standstill 3-5 days in 20-40 ℃, the aging bunker of relative humidity＞50% that the good bank that rolls combination treatment is put into temperature, finishes still aging processing, prepare can be used for preparing build the road and building material made raw material such as brickmaking in the wet-discharged coal ash compound.
In the Chemical Pretreatment of wet-discharged coal ash, adopting the reason that rolls combination treatment is to contain some thinner II level ash in the wet-discharged coal ash, and in addition, the activation adulterant that joins in the wet-discharged coal ash compound is also thinner, and has viscosity.The automatic conglomeration of meeting after they meet water, adopt other alr mode to be difficult to these material groups are broken up, thereby can influence material blended homogeneity, adopt wet type rolling mixing machine then to help pulverizing these material groups, can drive simultaneously the gas that partly is mixed in the material away, obtain contacting more closely thereby make between the particle of different material in the material, for hydro-thermal reaction provides external conditions preferably.Because material is in loose stacking state, the ionic travelling speed is very low, still aging process helps material inside and carries out hydro-thermal reaction, generate the C-S-H gel, thereby make wet-discharged coal ash obtain significant modification, be embodied in the irregular flyash particle of profile, in the outstanding part of its corner angle, owing to the internal structure defective has been assembled higher interior energy greatly, be easy to most be changed into the C-S-H gel by aquation and generation hydro-thermal reaction.That is to say that the Chemical Pretreatment process can make the irregular profile of flyash particle develop to spheroidization, workability, flowability and the plasticity-of material are improved, help improving the moulding process of product.In addition, in wet-discharged coal ash Chemical Pretreatment process, generate C-S-H gel, help improving the intensity of product with hydraulicity.In addition, in the wet-discharged coal ash compound, can directly mix the not chemical gypsum and the carbide slag of drying, so not only utilize industrial waste, reduce the production cost of wet-discharged coal ash compound simultaneously again significantly.
Wet-discharged coal ash compound of the present invention also is applicable to and utilizes the production of wet-discharged coal ash for building material mades such as the autoclaved fly ash brick of raw material, sintering-free flyash brick, fly ash hollow building block, flyash paving brick, unburned knot lytags.
The concrete grammar of realizing wet-discharged coal ash Chemical Pretreatment of the present invention is:
At first select for use f-CaO＞60%, MgO＜5%, fineness to reach the 0.08mm square hole sieve to tail over＜10%, digestion time is no more than 5 minutes fast construction lime powder, SO
3 2-＞30%, fineness reach the 0.08mm square hole sieve and tail over＜10% natural dihydrate gypsum and fineness reach the 0.08mm square hole sieve and tail over＜10% calcite activates adulterant as wet-discharged coal ash.Adulterant is chosen the back and is carried out wet-discharged coal ash compound batching (weight) % by following proportioning: wet-discharged coal ash 74-80; Lime powder 7-15; Dihydrate gypsum powder 6-9; Calcite in powder 2-4.Ratio of water to material is 0.2-0.4.Rolling combination treatment in measured various raw materials of scale and the batching water adding wet type rolling mixing machine, material is uniformly mixed, at last the good bank that rolls combination treatment being put into temperature is to leave standstill 3-5 days in 20-40 ℃, the aging bunker of relative humidity＞50%, finish still aging processing, prepare can be used for preparing build the road and building material made raw material such as brickmaking in the wet-discharged coal ash compound.
Ca (OH) in lime powder chresard＜30% in the wet-discharged coal ash compound batching, the butt
2＞80% replacing carbide slag, dihydrate gypsum powder chresard＜30%, SO in the butt
3 2-＞30% chemical gypsum replaces, and calcite in powder can replace with ground dolomite.
Wet-discharged coal ash compound batching (weight) %:
Example 1
Wet-discharged coal ash 80; Lime powder 7; Dihydrate gypsum powder 7; Calcite in powder 3.
Ratio of water to material is 0.3.
Example 2
Wet-discharged coal ash compound batching (weight) %:
Wet-discharged coal ash 74; Carbide slag 15; Desulfurated plaster 8; Ground dolomite 3.
Ratio of water to material is 0.3
Claims (5)
1, a kind of chemically pretreating process of wet-discharged coal ash, it is characterized in that: at first select lime powder for use, gypsum and crystal seed are as the activation adulterant of wet-discharged coal ash, carry out the batching of wet-discharged coal ash compound then, rolling combination treatment in measured various raw materials of scale and the batching water adding wet type rolling mixing machine, material is uniformly mixed, at last the good bank that rolls combination treatment being put into temperature is 20-40 ℃, left standstill in the aging bunker of relative humidity＞50% 3-5 days, finish still aging processing, prepare can be used for preparing build the road and building material made raw material such as brickmaking in the wet-discharged coal ash compound.
2, the chemically pretreating process of a kind of wet-discharged coal ash according to claim 1 is characterized in that: as the lime powder of wet-discharged coal ash activation adulterant be f-CaO＞60%, MgO＜5%, fineness reach the 0.08mm square hole sieve and tail over＜10%, digestion time is no more than 5 minutes fast construction lime powder; Terra alba is SO
3 2-＞30%, fineness reaches the 0.08mm square hole sieve and tails over＜10% natural dihydrate gypsum powder; Crystal seed is that fineness reaches the 0.08mm square hole sieve and tails over＜10% calcite in powder.
3, the chemically pretreating process of a kind of wet-discharged coal ash according to claim 1 is characterized in that: the wet-discharged coal ash compound is pressed following proportioning batching (weight) %:
Wet-discharged coal ash 70-90; Lime powder 5-20; Natural dihydrate gypsum powder 3-15; Calcite in powder 1-10.Ratio of water to material is 0.2-0.4.
4, according to using the activation adulterant in the chemically pretreating process of claim 2 and 3 described a kind of wet-discharged coal ashs, it is characterized in that: as Ca (OH) in lime powder chresard＜30% that activates adulterant, the butt
2＞80% replacing carbide slag; SO in natural dihydrate gypsum powder chresard＜30%, the butt
3 2-＞30% chemical gypsum comprises that desulfurated plaster, phosphogypsum, fluorgypsum, citric acid gypsum replace; Calcite in powder can replace with ground dolomite.
5, the batching of the wet-discharged coal ash compound in the chemically pretreating process of a kind of wet-discharged coal ash according to claim 3 is characterized in that: the wet-discharged coal ash compound is pressed following proportioning batching (weight) %: wet-discharged coal ash 74-80; Lime powder 7-15; Dihydrate gypsum powder 6-9; Calcite in powder 2-4.Ratio of water to material is 0.2-0.4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01109093A CN1373102A (en) | 2001-02-28 | 2001-02-28 | Process for chemically pretreating wet-discharged flyash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01109093A CN1373102A (en) | 2001-02-28 | 2001-02-28 | Process for chemically pretreating wet-discharged flyash |
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| Publication Number | Publication Date |
|---|---|
| CN1373102A true CN1373102A (en) | 2002-10-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN01109093A Pending CN1373102A (en) | 2001-02-28 | 2001-02-28 | Process for chemically pretreating wet-discharged flyash |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1884175B (en) * | 2006-06-27 | 2010-10-06 | 武汉理工大学 | High-activity admixture slurry made of wet fly-ash and method for preparing same |
| CN102092994A (en) * | 2010-11-25 | 2011-06-15 | 大连恒翔粉煤灰综合利用有限公司 | Fly ash sintering-free ceramsite |
| CN101306928B (en) * | 2008-06-20 | 2011-09-21 | 北京世纪地和科技有限公司 | Pre- desiliconizing method from fly ash or slag |
| CN101965318B (en) * | 2007-11-12 | 2013-03-27 | 普洛希多企业公司 | Method for processing of pozzolans |
| CN103261115A (en) * | 2010-12-30 | 2013-08-21 | 美国石膏公司 | Method for in-situ manufacture of a lightweight fly ash based aggregate |
| CN104844083A (en) * | 2015-04-17 | 2015-08-19 | 湖北锦润科技建材股份有限公司 | Energy-saving and environmental-protection brick and preparation method thereof |
| CN106220007A (en) * | 2016-07-29 | 2016-12-14 | 淮安市水泥厂有限公司 | A kind of method that activation fine coal produces wear-resisting impervious, cement |
-
2001
- 2001-02-28 CN CN01109093A patent/CN1373102A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1884175B (en) * | 2006-06-27 | 2010-10-06 | 武汉理工大学 | High-activity admixture slurry made of wet fly-ash and method for preparing same |
| CN101965318B (en) * | 2007-11-12 | 2013-03-27 | 普洛希多企业公司 | Method for processing of pozzolans |
| CN101306928B (en) * | 2008-06-20 | 2011-09-21 | 北京世纪地和科技有限公司 | Pre- desiliconizing method from fly ash or slag |
| CN102092994A (en) * | 2010-11-25 | 2011-06-15 | 大连恒翔粉煤灰综合利用有限公司 | Fly ash sintering-free ceramsite |
| CN103261115A (en) * | 2010-12-30 | 2013-08-21 | 美国石膏公司 | Method for in-situ manufacture of a lightweight fly ash based aggregate |
| CN104844083A (en) * | 2015-04-17 | 2015-08-19 | 湖北锦润科技建材股份有限公司 | Energy-saving and environmental-protection brick and preparation method thereof |
| CN106220007A (en) * | 2016-07-29 | 2016-12-14 | 淮安市水泥厂有限公司 | A kind of method that activation fine coal produces wear-resisting impervious, cement |
| CN106220007B (en) * | 2016-07-29 | 2019-04-02 | 淮安市水泥厂有限公司 | A method of wear-resisting impervious, cement is produced with activating fly ash |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |