CN110818293A - Cementing material containing a large amount of waste incineration fly ash and slag, and preparation method and application thereof - Google Patents
Cementing material containing a large amount of waste incineration fly ash and slag, and preparation method and application thereof Download PDFInfo
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- CN110818293A CN110818293A CN201911031888.4A CN201911031888A CN110818293A CN 110818293 A CN110818293 A CN 110818293A CN 201911031888 A CN201911031888 A CN 201911031888A CN 110818293 A CN110818293 A CN 110818293A
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- fly ash
- slag
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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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention relates to a cementing material containing a large amount of waste incineration fly ash and slag, and a preparation method and application thereof. A cementing material containing a large amount of waste incineration fly ash and slag mainly comprises the following components: 30-70 parts of S95 slag, 20-60 parts of waste incineration fly ash and 7-13 parts of desulfurized gypsum. The invention is doped with a large amount of waste incineration fly ash, can show good compression strength capable of being industrially applied without adding additives such as excitant, early strength agent and the like, can be used as cementing material of concrete and cementing filling material for mining, and is a good substitute of cement.
Description
Technical Field
The invention relates to the field of building materials, in particular to a cementing material containing a large amount of waste incineration fly ash and slag, and a preparation method and application thereof.
Background
According to statistics of research institute of E20, 257 operating waste incineration power plants are built nationwide in 2015, the total quantity of waste incineration in China is 6811 ten thousand tons, and according to national records of hazardous wastes, fly ash (hereinafter, fly ash) generated in the waste incineration process belongs to hazardous wastes and is about 3% -5% of the quantity of incineration waste, the generation quantity of the fly ash reaches 395 ten thousand tons, nearly 300 waste incineration power plants are built in 2016 years, and the fly ash reaches over 1000 ten thousand tons per year after 2020. In the face of such huge annual output of waste incineration fly ash, the search for a reasonable green disposal method is urgent, and how to maximize the utilization of the hazardous waste such as fly ash becomes a hot content of the research in the hazardous waste disposal field of the present time. The slag and the desulfurized gypsum are utilized to prepare the full-solid waste cementing material by utilizing the waste incineration fly ash in a synergistic manner, so that the problems of reduction, harmlessness and resource utilization of industrial solid waste (steel slag) and urban hazardous waste (waste incineration fly ash) can be solved, the synergistic utilization of the solid waste and the hazardous waste and environmental protection are promoted, the cementing material is provided for large-scale replacement of cement solidification stabilization safety landfill or preliminary combination of a cementing filling mining technology, and the engineering application foundation is laid. However, the existing cementing material containing waste incineration fly ash has the following problems: the strength with practical value can be achieved only by adding excessive additives such as excitant, early strength agent and the like.
Disclosure of Invention
The invention aims to provide a cementing material containing a large amount of waste incineration fly ash and slag, which is doped with a large amount of waste incineration fly ash, can show good compression strength capable of being industrially applied without adding additives such as an excitant, an early strength agent and the like, can be used as a cementing material of concrete, can be used as a mining filling material and is a good substitute of cement.
In order to achieve the above purpose, the invention provides the following technical scheme:
a cementing material containing a large amount of waste incineration fly ash and slag mainly comprises the following components:
30-70 parts of S95 slag, 20-60 parts of waste incineration fly ash and 7-13 parts of desulfurized gypsum.
The cementing material has at least the following characteristics:
firstly, compared with the existing cementing material containing a large amount of waste incineration fly ash and slag, the cementing material disclosed by the invention is simpler in composition, does not need to add additives such as an exciting agent and an early strength agent, and consists of three components of S95 slag, waste incineration fly ash and desulfurized gypsum, so that the raw material cost is greatly reduced, and the utilization rate of the waste incineration fly ash is higher.
Second, the composition is simplified while still exhibiting good cementitious properties, including compressive strength and effective solidification of various heavy metals in the fly ash. The water-cement ratio is 0.3:1, and the cementing material is prepared into a pure slurry test block according to GB17671-1999 cement mortar strength test method, the test block size is 30mm multiplied by 50mm, and the curing is carried out at the temperature of 35 ℃ and the humidity of more than 99.5 percent, so that the high-strength fly ash cement mortar has good compressive strength and can effectively cure a plurality of heavy metals in fly ash.
Thirdly, the safety is high: the adopted waste incineration fly ash has good safety, and the leaching concentration of heavy metal ions (Cr, Cu, Zn, Cd, Sb, Hg, Pb and the like) is all lower than the drinking water standard for a long time (360 d); in addition, the slag and the desulfurized gypsum have certain solidification effect on chloride ions in the fly ash, and the corrosion to other building materials such as reinforcing steel bars is avoided.
In conclusion, the cementing material provided by the invention utilizes slag to replace the traditional cementing agent cement, and synergistically utilizes the waste incineration fly ash to prepare the full-solid waste cementing material, so that the waste incineration fly ash is recycled to the maximum extent, a better mixing amount of the waste incineration fly ash in a full-solid waste cementing system is provided, and the leaching concentration of heavy metal ions in the system is still lower than the drinking water standard in short-term and long-term leaching toxicity (horizontal oscillation method), so that the problems of reduction, harmlessness and recycling of industrial solid waste (steel slag) and urban hazardous waste (waste incineration fly ash) can be solved, the synergistic utilization of the solid waste and the hazardous waste and environmental protection are promoted, the cementing material is provided for large-scale replacement of cement solidification stabilization safe landfill, preliminary bonding filling mining technology or preparation of concrete for buildings, and an engineering application foundation is laid.
The S95 slag according to the present invention refers to any slag having a 28d reactivity index of not less than 95%.
The waste incineration fly ash refers to bottom ash generated in the incineration disposal process of domestic waste or industrial waste, and is the waste incineration fly ash of a mechanical grate incineration process.
The main component of the desulfurized gypsum of the invention is similar to natural gypsum and is calcium sulfate dihydrate CaSO4·2H2O。
The invention also optimizes the proportion and the chemical composition of each component on the basis of the formula so as to improve the gelling property to a greater extent or reduce the industrial cost.
Preferably, the cement containing a large amount of waste incineration fly ash and slag consists of only S95 slag, waste incineration fly ash and desulfurized gypsum, and as described above, each component may take any value within the above range. For example, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, etc. may be taken as the refuse-incinerated fly ash. The S95 slag may be taken in 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, etc. The desulfurized gypsum may be taken in amounts of 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts and 13 parts.
Preferably, the cement material containing a large amount of waste incineration fly ash and slag consists essentially of:
30-70 parts of S95 slag, 20-60 parts of high-safety-rate-dump garbage incineration fly ash and 7-13 parts of desulfurized gypsum.
Preferably, the cement material containing a large amount of waste incineration fly ash and slag consists essentially of:
30-70 parts of S95 slag, 20-60 parts of Lujiashan waste incineration fly ash and 9-11 parts of desulfurized gypsum.
Preferably, the cement material containing a large amount of waste incineration fly ash and slag consists essentially of:
30-70 parts of S95 slag, 20-60 parts of waste incineration fly ash of Sichuan plants and 10 parts of desulfurized gypsum.
Preferably, the cement material containing a large amount of waste incineration fly ash and slag consists essentially of:
30-70 parts of S95 slag, 20-60 parts of fly ash from waste incineration in certain plants in North Hu China and 10 parts of desulfurized gypsum.
Preferably, the waste incineration fly ash mainly consists of the following components: 32-42 parts of CaO, 12-28 parts of Cl and SiO by weight22-6 parts of Al2O31-4 parts, K23-7 parts of O, 3-7 parts of MgO and Na2O3-7 parts, Fe2O31-3 parts.
Preferably, the S95 slag consists essentially of: 45-50 parts of CaO and SiO by weight228-32 parts of Al2O310-14 parts of MgO 5-7 parts of Fe2O31-2 parts of SO30-1 part.
Preferably, the desulfurized gypsum consists essentially of: 45-50 parts of CaO and SiO by weight22-3 parts of Al2O30-1 part of MgO, 1-2 parts of SO340-46 parts of Cl and 0-1 part of Cl.
The chemical compositions of the refuse incineration fly, the S95 slag and the desulfurized gypsum according to the present invention refer to the contents of various metals or mineral elements in terms of oxides, and do not refer to the contents of compounds present in the refuse incineration fly, the S95 slag or the desulfurized gypsum slag in terms of oxides. In addition, the above chemical composition results can be obtained by conventional detection methods known in the art, such as typical fluorescence detection after or without loss of ignition.
When fluorescence detection is performed after ignition loss, the ignition loss temperature is usually about 900. + -. 5 ℃.
Preferably, the S95 slag has a specific surface area of 500m2More than kg.
Preferably, the specific surface area of the desulfurized gypsum is 400m2More than kg.
The specific surface area of the raw materials is improved through grinding, so that the activity of the slag is stimulated, the hydration difficulty is reduced, and the uniformity of the materials is improved.
The S95 slag, waste incineration fly ash and desulfurized gypsum used in the invention can be purchased from the market or prepared by self, as long as the requirements of chemical compositions are met.
At present, the incineration treatment technology in China is mainly divided into three types: grate furnace technology, fluidized bed technology, and other incineration technologies. The waste incineration fly ash generated by the incineration technology comprises two parts, wherein one part is ash obtained by a heat recovery utilization system in front of a flue gas purification system, and comprises (boiler ash, economizer ash and superheater ash), and the other part is flue gas purification system (APC) ash, comprising wet process or semi-dry process dust remover ash, cyclone dust remover ash and bag-type dust remover ash. The fly ash used by the invention adopts a grate furnace incineration technology, and the fly ash produced by incineration through the grate furnace incineration technology contains much higher heavy metal, dioxin and chloride than the fly ash produced by other incineration technologies. However, the fly ash with such great harm is still used to prepare the cementing material, and the lower metal leaching rate is still displayed, which shows that the fly ash has good synergistic effect with slag and gypsum, and the synergistic effect can efficiently solidify heavy metals in the fly ash, thereby reducing the leaching rate and improving the safety of the cementing material.
When the cementing material is used, the cementing material is mixed with water according to the water-cement ratio of 0.3-0.5: 1, and concrete can be prepared by utilizing the water-cement ratio.
In summary, compared with the prior art, the invention achieves the following technical effects:
(1) the recovery rate of the waste incineration fly ash is improved;
(2) the raw material composition of the cementing material containing a large amount of waste incineration fly ash and slag is simplified;
(3) the waste incineration fly ash, the slag and the desulfurized gypsum have synergistic effect to show higher compressive strength and effectively solidify various heavy metals in the fly ash.
(4) The cementing material has high safety and no heavy metal leaching risk;
(5) the preparation method is simple.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Examples 1 to 4
The method for preparing the cementing material by using the large-content waste incineration fly ash comprises the following components in percentage by mass: 20-35% of waste incineration fly ash (from 4 incineration power plants, namely Beijing Gaoangtun, Beijing Lujiashan, Sichuan and Hubei), 55-70% of S95 slag powder and 10% of desulfurized gypsum.
Wherein the chemical compositions of the fly ash, the S95 slag powder and the desulfurized gypsum are shown in Table 1, and the detection method comprises the following steps: x-ray fluorescence Spectroscopy (XRF), and substance composition analysis was performed by measuring secondary X-rays using an X-ray fluorescence spectrometer model XRF-1800.
The heavy metal leaching concentrations of the four waste incineration fly ashes and the S95 slag powder are shown in Table 2.
After pouring and forming, curing to different ages for testing compressive strength and leaching toxicity, wherein the testing method comprises the following steps:
the raw materials are respectively weighed according to the proportion, and the desulfurized gypsum needs to be ground to 400m2Grinding/kg, S95 slag into powder of 500m2Kg, water-to-glue ratio of 0.3:1, preparing a filling material sample according to GB17671-1999 method for testing cement mortar strength, wherein the sample size is 30mm multiplied by 50mm, and curing is carried out at the temperature of 35 ℃ and the humidity of more than 99.5 percent.
The test results are shown in tables 3 and 4.
TABLE 1 analysis of the raw materials
Examples 5 to 8
The method for preparing the cementing material by using the large-content waste incineration fly ash comprises the following components in percentage by mass: 35-50% of waste incineration fly ash (from 4 incineration power plants, namely Beijing Gaoangtun, Beijing Lujiashan, Sichuan and Hubei respectively), 40-55% of S95 slag powder and 10% of desulfurized gypsum.
Wherein, the chemical compositions and sources of the waste incineration fly ash, the S95 slag powder and the desulfurization gypsum are the same as those of the embodiment 1.
After casting and forming, curing to different ages for carrying out compressive strength test and leaching toxicity test, the test method is the same as that of example 1, and the test results are shown in tables 3 and 4.
Examples 9 to 12
The method for preparing the cementing material by using the large-content waste incineration fly ash comprises the following components in percentage by mass: 50-60% of waste incineration fly ash (from 4 incineration power plants, namely Beijing Gaoangtun, Beijing Lujiashan, Sichuan and Hubei respectively), 30-40% of S95 slag powder and 10% of desulfurized gypsum.
Wherein, the chemical compositions and sources of the waste incineration fly ash, the S95 slag powder and the desulfurization gypsum are the same as those of the embodiment 1.
After casting and forming, curing to different ages for carrying out compressive strength test and leaching toxicity test, the test method is the same as that of example 1, and the test results are shown in tables 3 and 4.
TABLE 2 original four kinds of refuse-incinerated fly ash and slag heavy metal leaching concentration (ug/L)
TABLE 3 compression Strength of the clean pulp test blocks
Note: the four kinds of fly ashes are in a mud shape and have no strength when the mixing amount is 50-60% (examples 9-12) and the hydration age reaches 360 days.
TABLE 4 Total concentration of heavy metals (μ g/L) in different ages of the test pieces
Example 13
The cementing material prepared from the large-doping-amount waste incineration fly ash comprises the following components in percentage by mass: 40% of waste incineration fly ash (from Beijing Gaoguan incineration power plant, same as example 1), 50% of S95 slag powder and 10% of desulfurized gypsum.
Wherein, the chemical compositions and sources of the waste incineration fly ash, the S95 slag powder and the desulfurization gypsum are the same as those of the embodiment 1.
After casting and molding, the concrete is cured to different ages for testing the compressive strength, the testing method is the same as that of the example 1, and the testing results are shown in the table 5.
TABLE 5 compression Strength of the clean pulp test blocks
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A cementing material containing a large amount of waste incineration fly ash and slag is characterized by mainly comprising the following components:
30-70 parts of S95 slag, 20-60 parts of waste incineration fly ash and 7-13 parts of desulfurized gypsum.
2. Cement according to claim 1, characterized by consisting of: 30-70 parts of S95 slag, 20-60 parts of waste incineration fly ash and 9-11 parts of desulfurized gypsum;
preferably, 30-70 parts of S95 slag, 20-40 parts of waste incineration fly ash and 10 parts of desulfurized gypsum by weight.
3. The cementitious material of claim 1, wherein the waste incineration fly ash consists essentially of: 32-42 parts of CaO, 12-28 parts of Cl and SiO by weight22-6 parts of Al2O31-4 parts, K23-7 parts of O, 3-7 parts of MgO and Na2O3-7 parts, Fe2O31-3 parts.
4. Cement according to claim 1, characterised in that the S95 slag consists essentially of: 45-50 parts of CaO and SiO by weight228-32 parts of Al2O310-14 parts of MgO 5-7 parts of Fe2O31-2 parts of SO30-1 part.
5. Cement according to claim 1, characterised in that the desulfurized gypsum consists essentially of: 45-50 parts of CaO and SiO by weight22-3 parts of Al2O30-1 part of MgO, 1-2 parts of SO340-46 parts of Cl and 0-1 part of Cl.
6. Cement according to claim 1, characterised in that the specific surface area of the S95 slag is 500m2More than kg;
preferably, the specific surface area of the desulfurized gypsum is 400m2More than kg.
7. A method for preparing a cementitious material as claimed in any one of claims 1 to 6, characterised in that it comprises the following steps:
and uniformly mixing all the raw materials with water according to the water-to-glue ratio of 0.3-0.5: 1.
8. The method according to claim 7, wherein the waste incineration fly ash is produced by a grate furnace incineration technique.
9. Use of the cementitious material according to any one of claims 1 to 6 for making concrete or mining fillers.
10. Concrete, characterized in that it comprises a cementitious material according to any one of claims 1 to 6 and in that the water-to-cement ratio of the concrete is 0.2 to 0.4: 1.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111559878A (en) * | 2020-05-09 | 2020-08-21 | 北京科技大学 | Cementing filler containing fluidized bed waste incineration fly ash and preparation method thereof |
| CN112897911A (en) * | 2021-02-04 | 2021-06-04 | 中国葛洲坝集团水泥有限公司 | Curing agent and method for reducing leaching toxicity of manganese element in cement |
| CN113024143A (en) * | 2021-01-14 | 2021-06-25 | 何振华 | Formula and production process for producing high-performance concrete and cement admixture by utilizing fly ash |
| CN113024135A (en) * | 2021-05-11 | 2021-06-25 | 海南津桓建材科技有限公司 | Method for preparing cementing material by using modified waste |
| CN113213794A (en) * | 2021-04-13 | 2021-08-06 | 天津金石建材科技有限公司 | Resource recycling method for preparing gelatinization material from incineration fly ash |
| CN113896460A (en) * | 2021-06-24 | 2022-01-07 | 辽宁海天阁环保科技有限公司 | Waste incineration fly ash solidified body pouring material, preparation method and application |
| CN114180865A (en) * | 2022-02-17 | 2022-03-15 | 河北科技大学 | Method for resource utilization of municipal refuse incineration fly ash |
| CN114804736A (en) * | 2022-04-28 | 2022-07-29 | 武汉武新新型建材股份有限公司 | Geopolymer prepared from fly ash and bottom ash generated by burning household garbage and preparation method thereof |
| CN116217106A (en) * | 2022-12-24 | 2023-06-06 | 北京科技大学 | Cementing material containing water-washed waste incineration fly ash and waste incineration bottom ash, and preparation method and application thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111559878A (en) * | 2020-05-09 | 2020-08-21 | 北京科技大学 | Cementing filler containing fluidized bed waste incineration fly ash and preparation method thereof |
| CN113024143A (en) * | 2021-01-14 | 2021-06-25 | 何振华 | Formula and production process for producing high-performance concrete and cement admixture by utilizing fly ash |
| CN112897911A (en) * | 2021-02-04 | 2021-06-04 | 中国葛洲坝集团水泥有限公司 | Curing agent and method for reducing leaching toxicity of manganese element in cement |
| CN113213794A (en) * | 2021-04-13 | 2021-08-06 | 天津金石建材科技有限公司 | Resource recycling method for preparing gelatinization material from incineration fly ash |
| CN113024135A (en) * | 2021-05-11 | 2021-06-25 | 海南津桓建材科技有限公司 | Method for preparing cementing material by using modified waste |
| CN113896460A (en) * | 2021-06-24 | 2022-01-07 | 辽宁海天阁环保科技有限公司 | Waste incineration fly ash solidified body pouring material, preparation method and application |
| CN114180865A (en) * | 2022-02-17 | 2022-03-15 | 河北科技大学 | Method for resource utilization of municipal refuse incineration fly ash |
| CN114180865B (en) * | 2022-02-17 | 2022-04-29 | 河北科技大学 | Method for resource utilization of municipal refuse incineration fly ash |
| CN114804736A (en) * | 2022-04-28 | 2022-07-29 | 武汉武新新型建材股份有限公司 | Geopolymer prepared from fly ash and bottom ash generated by burning household garbage and preparation method thereof |
| CN114804736B (en) * | 2022-04-28 | 2023-09-26 | 武汉武新新型建材股份有限公司 | Geopolymer utilizing household garbage incineration fly ash and bottom ash and preparation method thereof |
| CN116217106A (en) * | 2022-12-24 | 2023-06-06 | 北京科技大学 | Cementing material containing water-washed waste incineration fly ash and waste incineration bottom ash, and preparation method and application thereof |
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Application publication date: 20200221 |