CN110698159A - Method for preparing baking-free bricks by using waste incineration fly ash - Google Patents
Method for preparing baking-free bricks by using waste incineration fly ash Download PDFInfo
- Publication number
- CN110698159A CN110698159A CN201911121381.8A CN201911121381A CN110698159A CN 110698159 A CN110698159 A CN 110698159A CN 201911121381 A CN201911121381 A CN 201911121381A CN 110698159 A CN110698159 A CN 110698159A
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- CN
- China
- Prior art keywords
- fly ash
- incineration fly
- waste incineration
- washing
- baking
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Classifications
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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
- 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
- C04B28/14—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 calcium sulfate cements
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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
- 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
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- 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)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a method for preparing baking-free bricks by utilizing waste incineration fly ash, which comprises the following steps: screening the waste incineration fly ash, and reserving the waste incineration fly ash with the particle size of less than 3mm for later use; grinding the screened waste incineration fly ash by using a ball mill until the particle size is below 200 microns; after being washed and dried, the mixture is evenly mixed with the additive to form powder; adding water, stirring by using a mortar stirrer, and pouring into a forming die; and maintaining for more than 28 days at the temperature of 20-40 ℃ and the humidity of 70-90% to prepare the brick body. The resource recycling of the incineration fly ash is realized, the baking-free brick which can be used as a building material is prepared, the leaching of the heavy metal of the prepared baking-free brick is completely lower than the national standard, the preparation process is simple and efficient, the life hazardous waste is treated, and the baking-free brick is recycled and has remarkable social and economic values.
Description
Technical Field
The invention relates to a method for preparing baking-free bricks by utilizing waste incineration fly ash, belonging to the field of reduction, harmlessness and resource utilization of hazardous wastes.
Background
With the advance of urbanization and the increasing development of human production and living, the generated garbage brings great threat to human living and ecological environment, and the garbage problem becomes an important social problem. According to statistics, the annual yield increasing speed of the municipal solid waste is up to 8-10%, the annual yield of the municipal solid waste in 2010 is about 3 hundred million tons, and the annual yield of the municipal solid waste is estimated to reach 7.1 hundred million tons in 2020. The municipal solid waste treatment rate of China is only about 50%, and the harmless treatment rate is lower and less than 2%. The long-term open-air stacking of the garbage causes serious pollution to the environment and brings serious threat to human health, so that how to treat the domestic garbage economically, effectively and powerfully is one of the problems which are commonly concerned and urgently needed to be solved by the whole society. The waste incineration comes from the end of the 19 th century, and after the 70 th century, due to the improvement and perfection of the industrial technology level and the great increase of the amount of combustible materials in the waste, the waste incineration treatment technology is mature day by day. In particular, in the last thirty years, waste incineration plants bloomed all the time, almost all developed countries have built waste incineration plants of different quantities and scales one after the other, and developing countries have also started investing in creating waste incineration plants.
The widespread use of waste incineration technology inevitably causes a series of problems, and secondary pollutants (mainly gas emissions and incineration ash) generated in the waste incineration process are attracting more and more attention. As the amount of household garbage burned increases year by year, a large amount of solid waste, i.e., incineration slag, is generated, the waste incineration slag generally comprises residual incineration residues on a grate and fine ash falling from the space between the grates, and waste heat boiler ash and slag are mixed, collected and disposed in some incineration plants. The slag accounts for about 80 percent of the weight of the incineration ash and mainly comprises slag, black and nonferrous metals, ceramic fragments, glass and other non-combustible inorganic matters and incompletely combusted organic matters. The fly ash is residue collected in a flue gas purification system and a heat recovery system such as an economizer, a boiler and the like, and accounts for about 20% of the total amount of ash. Such a large amount of slag is generated, which makes disposal difficult. In order to save increasingly tense landfill sites and reduce the disposal cost of the slag, the resource utilization of the slag is a feasible method which is more in line with the actual situation of China.
Disclosure of Invention
In order to solve the problems, the invention provides a method for preparing a baking-free brick by using waste incineration fly ash, which is used for preparing the household waste incineration fly ash into the baking-free brick so as to realize the reutilization of hazardous waste.
In order to achieve the above purpose, the specific scheme of the invention is as follows:
a method for preparing baking-free bricks by utilizing waste incineration fly ash comprises the following steps:
(1) screening the waste incineration fly ash, and reserving the waste incineration fly ash with the particle size of less than 3mm for later use;
(2) grinding the screened waste incineration fly ash by using a ball mill until the particle size is below 200 microns;
(3) washing the waste incineration fly ash in the step (2) with water and then drying;
(4) uniformly mixing the waste incineration fly ash in the step (3) with an additive to form powder; adding water, stirring for 3-5 min by using a mortar stirrer, and pouring into a forming mold;
(5) and maintaining for more than 28 days at the temperature of 20-40 ℃ and the humidity of 70-90% to prepare the brick body.
Further, the ratio of the waste incineration fly ash to the additive in the step (4) is 1.8-2: 1 by mass.
Further, the additive in the step (4) is a mixture of cement, quicklime, mirabilite, CaCl2, gypsum, a water reducing agent, ferrous sulfate and sodium sulfate.
Further, the additive comprises, by mass, 10-15% of cement, 30-45% of quicklime, 1-2% of mirabilite, 22-4% of CaCl, 16-18% of gypsum, 2-3% of a water reducing agent, 3-5% of ferrous sulfate and the balance of sodium sulfate.
Further, the water washing process in the step (3) is secondary water washing, the first water washing condition is that the liquid-solid ratio of water to the household garbage incineration fly ash is 5-6, the frequency oscillation of 220-230 rpm is adopted during water washing, the water washing time is 40-50 min, the second water washing condition is that the liquid-solid ratio of water to the household garbage incineration fly ash is 3-4, the frequency oscillation of 260-280 rpm is adopted during water washing, and the water washing time is 35-45 min.
Further, the pH was controlled to 10 or more during the washing with water.
Compared with the prior art, the invention has the beneficial effects that:
the resource recycling of the incineration fly ash is realized, the baking-free brick which can be used as a building material is prepared, the leaching of the heavy metal of the prepared baking-free brick is completely lower than the national standard, the preparation process is simple and efficient, the life hazardous waste is treated, and the baking-free brick is recycled and has remarkable social and economic values.
Detailed Description
Example 1
Screening the waste incineration fly ash, and reserving the waste incineration fly ash with the particle size of less than 3mm for later use; grinding the screened waste incineration fly ash by using a ball mill until the particle size is below 200 microns; drying after washing, wherein the washing process is secondary washing, the pH value is controlled to be more than 10 in the washing process, the first washing condition is that the liquid-solid ratio of water to the household garbage incineration fly ash is 5, the frequency oscillation of 220rpm is adopted during the washing, the washing time is 90min, the second washing condition is that the liquid-solid ratio of water to the household garbage incineration fly ash is 3, the frequency oscillation of 260rpm is adopted during the washing, and the washing time is 60 min; uniformly mixing the dried waste incineration fly ash with an additive to form powder, wherein the additive is a mixture of cement, quicklime, mirabilite, CaCl2, gypsum, a water reducing agent, ferrous sulfate and sodium sulfate, and the mass ratio of the additive to the cement is 10-15%, the mass ratio of the additive to the quicklime is 30%, the mass ratio of the additive to the CaCl is 2%, and the mass ratio of the additive to the CaCl is 10-22 percent of gypsum, 16 percent of water reducing agent, 3 percent of ferrous sulfate and the balance of sodium sulfate, wherein the mass ratio of the waste incineration fly ash to the additive is 1.8; adding water, stirring for 5min with a mortar stirrer, and pouring into a forming mold; maintaining at 40 deg.C and 90% humidity for more than 28 days to obtain the brick body.
Example 2
The difference between the present example and example 1 is that the first washing condition is that the ratio of liquid to solid of the fly ash from incineration of domestic garbage is 6.
Example 3
The difference between this example and example 1 is that the second water washing is carried out under the condition that the ratio of liquid to solid of the fly ash from incineration of domestic garbage is 4.
Example 4
The difference between the embodiment and the embodiment 1 is a mixture of cement, quicklime, mirabilite, CaCl2, gypsum, a water reducing agent, ferrous sulfate and sodium sulfate, wherein the mass ratio of the cement to the quicklime to the mixture is 15%, the mass ratio of the mirabilite to the mixture is 2%, the mass ratio of the CaCl 24%, the mass ratio of the gypsum to the mixture is 18%, the mass ratio of the water reducing agent to the mixture is 3%, the mass.
Example 5
The difference between the embodiment and the embodiment 1 is that the ratio of the waste incineration fly ash to the additive is 2:1 by mass.
Comparative example 1
The difference between the comparative example and the example 1 is that the liquid-solid ratio of the water of the first water washing to the fly ash of the incineration of the household garbage is 8.
Comparative example 2
The difference between the comparative example and the example 1 is that the liquid-solid ratio of the water of the second water washing to the fly ash of the incineration of the household garbage is 5.
Comparative example 3
The comparative example differs from example 1 in that the additive is a conventional additive.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention in any way, and any person skilled in the art can make any simple modification, equivalent replacement, and improvement on the above embodiment without departing from the technical spirit of the present invention, and still fall within the protection scope of the technical solution of the present invention.
Claims (6)
1. A method for preparing baking-free bricks by utilizing waste incineration fly ash is characterized by comprising the following steps: the method comprises the following steps:
(1) screening the waste incineration fly ash, and reserving the waste incineration fly ash with the particle size of less than 3mm for later use;
(2) grinding the screened waste incineration fly ash by using a ball mill until the particle size is below 200 microns;
(3) washing the waste incineration fly ash in the step (2) with water and then drying;
(4) uniformly mixing the waste incineration fly ash in the step (3) with an additive to form powder; adding water, stirring for 3-5 min by using a mortar stirrer, and pouring into a forming mold;
(5) and maintaining for more than 28 days at the temperature of 20-40 ℃ and the humidity of 70-90% to prepare the brick body.
2. The method for preparing baking-free bricks by using waste incineration fly ash according to claim 1, wherein the method comprises the following steps: the ratio of the waste incineration fly ash to the additive in the step (4) is 1.8-2: 1 by mass.
3. The method for preparing baking-free bricks by using waste incineration fly ash according to claim 1, wherein the method comprises the following steps: the additive in the step (4) is cement, quicklime, mirabilite and CaCl2A mixture of gypsum, a water reducing agent, ferrous sulfate and sodium sulfate.
4. The method for preparing baking-free bricks by using waste incineration fly ash according to claim 3, wherein the method comprises the following steps: the additive comprises, by mass, 10-15% of cement, 30-45% of quicklime, 1-2% of mirabilite and CaCl22-4% of gypsum, 16-18% of water reducing agent, 2-3% of ferrous sulfate and the balance of sodium sulfate.
5. The method for preparing baking-free bricks by using waste incineration fly ash according to claim 1, wherein the method comprises the following steps: and (3) carrying out secondary washing in the washing process in the step (3), wherein the first washing condition is that the liquid-solid ratio of water to the household garbage incineration fly ash is 5-6, the frequency oscillation of 220-230 rpm is adopted during washing, the washing time is 30-90 min, the second washing condition is that the liquid-solid ratio of water to the household garbage incineration fly ash is 3-4, the frequency oscillation of 260-280 rpm is adopted during washing, and the washing time is 30-60 min.
6. The method for preparing baking-free bricks by using waste incineration fly ash according to claim 1, wherein the method comprises the following steps: the pH is controlled to be above 10 during the washing process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911121381.8A CN110698159A (en) | 2019-11-15 | 2019-11-15 | Method for preparing baking-free bricks by using waste incineration fly ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911121381.8A CN110698159A (en) | 2019-11-15 | 2019-11-15 | Method for preparing baking-free bricks by using waste incineration fly ash |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110698159A true CN110698159A (en) | 2020-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911121381.8A Pending CN110698159A (en) | 2019-11-15 | 2019-11-15 | Method for preparing baking-free bricks by using waste incineration fly ash |
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| CN (1) | CN110698159A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112605097A (en) * | 2020-11-30 | 2021-04-06 | 宝武集团环境资源科技有限公司 | Pretreatment method and harmless treatment process of incineration fly ash or sintering ash |
| CN112661431A (en) * | 2020-12-24 | 2021-04-16 | 上海康恒环境股份有限公司 | Method for preparing baking-free brick after washing and desalting fly ash |
-
2019
- 2019-11-15 CN CN201911121381.8A patent/CN110698159A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112605097A (en) * | 2020-11-30 | 2021-04-06 | 宝武集团环境资源科技有限公司 | Pretreatment method and harmless treatment process of incineration fly ash or sintering ash |
| CN112661431A (en) * | 2020-12-24 | 2021-04-16 | 上海康恒环境股份有限公司 | Method for preparing baking-free brick after washing and desalting fly ash |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200117 |
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| WD01 | Invention patent application deemed withdrawn after publication |