CN112811838A - Production process for preparing concrete admixture by utilizing waste incineration fly ash molten glass solidified body - Google Patents
Production process for preparing concrete admixture by utilizing waste incineration fly ash molten glass solidified body Download PDFInfo
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- CN112811838A CN112811838A CN202110031619.9A CN202110031619A CN112811838A CN 112811838 A CN112811838 A CN 112811838A CN 202110031619 A CN202110031619 A CN 202110031619A CN 112811838 A CN112811838 A CN 112811838A
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- fly ash
- solidified body
- waste incineration
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- concrete admixture
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/10—Forming beads
- C03B19/1095—Thermal after-treatment of beads, e.g. tempering, crystallisation, annealing
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
- C03C1/002—Use of waste materials, e.g. slags
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/22—Glass ; Devitrified glass
-
- 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
- C04B18/10—Burned or pyrolised refuse
-
- 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)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Civil Engineering (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a production process for preparing concrete admixture by utilizing waste incineration fly ash molten glass solidified body, which comprises the following steps of (1) compounding waste incineration fly ash and auxiliary materials, and mixing the mixture by using a mixer after compounding, so that the waste incineration fly ash and the auxiliary materials are uniformly mixed; (2) putting the uniformly mixed mixture into a briquetting machine, and pressing under the pressure of 6-10 MPa to prepare fly ash blocks of 30cm multiplied by 30 cm-40 cm multiplied by 40 cm; (3) putting the fly ash block into a melting furnace for melting to form liquid slag; (4) the liquid slag flows into water quenching treatment equipment for water quenching treatment, the density is increased, and a glass solidified body is formed; (5) homogenizing the glass solidified body and the mineral active material, and then grinding by a ball mill to obtain a high-performance concrete admixture; the invention can change waste into valuable, save land resources, improve the comprehensive performance of the product by more than 10 percent and reduce the production cost by more than 20 percent.
Description
Technical Field
The invention belongs to the technical field of concrete admixture, and particularly relates to a production process for preparing concrete admixture by utilizing waste incineration fly ash molten glass solidified body.
Background
The construction of the 'non-waste city' is guided by a new development concept, the landfill amount is reduced to the maximum extent by continuously promoting the reduction and resource utilization of the waste source, the environmental impact is reduced to the minimum development mode, and a green development cycle is formed. In 2020, Zhejiang province promotes the construction of global waste-free cities to be fully expanded, and by the end of 2023, the construction of waste-free cities is completely completed in all districts and 50% of counties (cities and districts) in Zhejiang province.
In recent years, with the rapid increase of the production of urban domestic garbage, the production of waste incineration fly ash is increasing. According to measurement and calculation, 4-5 ten thousand tons of fly ash can be generated after every 100 ten thousand tons of garbage are burnt, and the generation amount of the fly ash generated by burning the garbage per year in Zhejiang province is over 150 ten thousand tons by 2020. As the fly ash generated by the waste incineration power plant contains a large amount of toxic heavy metals and compounds, the fly ash has high leaching rate and belongs to dangerous waste. In Zhejiang province people civil administration house office (2020) document No. 2, Notification about the construction work scheme of ' non-waste city ' in the whole region of Zhejiang province ' is that the industrial hazardous waste is hard to treat by forcible cracking, the optimization and development of incineration technology are required to be promoted, the generation amount of slag and fly ash is effectively reduced, the secondary pollution is controlled, and the intensive research and implementation of the test point projects such as melting of the incineration fly ash of the household garbage are performed.
The fly ash contains organic pollutants such as benzopyrene, benzanthracene, dioxin and the like and heavy metals such as Cr, Cd, Hg, Pb, Cu, Ni and the like, and is a highly dangerous solid waste. Dioxin is a chlorinated tricyclic aromatic hydrocarbon organic compound with various toxic effects and has irreversible teratogenicity, carcinogenicity and mutagenicity; hg and its compounds have strong neurotoxicity, which can cause serious damage to multiple organs of human body and cause serious harm to environment if not disposed properly.
The content of chlorine element is high. The high content of chlorine element is one of the most obvious characteristics of fly ash in China, and the chlorine content of part of fly ash is as high as more than 20%. Mainly, acid substances such as hydrogen chloride and the like generated after incineration and decomposition of chlorine-containing plastics and the like in the household garbage react with alkaline substances in a flue gas purification system, products enter fly ash, and salt and the like in kitchen garbage are finally enriched in the fly ash. Chlorine element in the fly ash exists mainly in the form of soluble chlorine salt, such as sodium chloride, potassium chloride, calcium chloride and the like.
The harmful components of the fly ash are complex and have large fluctuation. Besides toxic and harmful substances such as heavy metals and dioxin, the fertilizer also contains calcium-silicon-aluminum-iron oxides, chloride, carbon-sulfur-phosphorus elements and the like. The content of each substance (element) in the fly ash can generate large fluctuation along with the change of domestic garbage components, seasons, burning conditions, flue gas purification level and the like, and great difficulty is brought to the fly ash treatment and disposal.
Therefore, safe disposal of waste incineration fly ash is of real urgency.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at various defects and deficiencies of the prior art, the production process for preparing the concrete admixture by utilizing the waste incineration fly ash molten glass solidified body is provided, and the technical problem to be solved is to compound the waste incineration fly ash and the auxiliary raw materials according to a certain proportion, melt the waste incineration fly ash and the auxiliary raw materials into liquid at a high temperature of more than 1400 ℃ in a melting furnace, and carry out water quenching treatment on the liquid slag to generate more than 90 percent of glass solidified body, thereby solving the problem of pollution of the fly ash to the environment, simultaneously replacing the concrete admixture, improving the comprehensive performance and reducing the production cost.
The specific technical scheme of the invention is as follows:
the production process of preparing concrete admixture with waste incinerated flyash molten glass solidified body includes the following steps:
(1) compounding waste incineration fly ash and auxiliary materials, wherein the waste incineration fly ash: the auxiliary materials are 90: 10-80: 20, mixing the mixture by using a mixer after compounding so as to uniformly mix the waste incineration fly ash and the auxiliary materials;
(2) putting the uniformly mixed mixture into a briquetting machine, and pressing under the pressure of 6-10 MPa to prepare fly ash blocks of 30cm multiplied by 30 cm-40 cm multiplied by 40 cm;
(3) melting fly ash block in a melting furnace, wherein dioxin and organic matters are combusted, decomposed and gasified in the melting process, chlorine salt is melted into liquid at 810 ℃, and the liquid is discharged through slag discharge products to achieve the aim of dechlorination, and inorganic matters form a solidified body; a small part of heavy metals and salts contained in the fly ash form secondary fly ash, and the other parts are melted into liquid slag;
(4) after the melting is finished, the liquid slag flows into water quenching equipment for water quenching treatment, the density is increased, and a glass solidified body with the glass phase being equal to or larger than 90% is formed;
(5) homogenizing the glass solidified body and the mineral active material, and grinding by a grinding machine to obtain the high-performance concrete admixture, wherein the glass solidified body: the mineral active material is 90: 10-80: 20;
in the step (1), the auxiliary materials are a mixture of boric acid, nitrate, sodium bicarbonate and feldspar, wherein the boric acid: nitrate salt: sodium bicarbonate: the feldspar accounts for 15-20: 15-20: 25-35: 30-40.
In the step (5), the mineral active materials are blast furnace slag, vitrified micro bubbles, alunite and anhydrite, wherein the blast furnace slag: vitrification of the micro-beads: alunite: the anhydrite accounts for 30-45 percent: 20-30: 20-30: 10 to 20.
Preferably, the temperature in the melting furnace is 1400-1600 ℃, and the melting time is 45-60 minutes.
Preferably, the negative pressure of the fly ash block in the melting furnace is 900 to 1200 Pa.
The high-performance concrete admixture obtained by the invention can be widely applied to structural concrete engineering and can improve the performance index of cement concrete. Meanwhile, according to different use requirements, special concrete such as road concrete, corrosion-resistant concrete, marine concrete and the like and special dry-mixed mortar can be prepared.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the waste incineration fly ash is melted at high temperature to solidify heavy metal ions and decompose dioxin, the problem of high chlorine salt in the fly ash is solved, landfill is not needed, land resources are saved, and secondary environmental pollution is prevented.
2. The glass solidified body and other mineral active materials are homogenized, ground and modified to form high specific surface area powder, and the modified powder can be used as a high-activity material to replace a part of cementing materials in high-performance concrete. Compared with the detection result of the product prepared and produced by completely adopting minerals and chemical raw materials, the glass solidified body has the same physical and chemical properties and internal quality, can improve the comprehensive performance of the product by more than 10 percent, reduces the production cost by more than 20 percent, ensures that the product enjoys the tax-benefit policy of national resource comprehensive utilization projects, and has strong market competitiveness.
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the predetermined objects, the following detailed description will be given to the specific embodiments, structures, characteristics and effects of the production process for preparing concrete admixture by using waste incineration fly ash molten glass solidified body according to the present invention with reference to the preferred embodiments. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Example 1
(1) Taking 1 ton of waste incineration fly ash, and compounding the waste incineration fly ash with auxiliary materials, wherein the waste incineration fly ash: the auxiliary materials are 80: 20, wherein the auxiliary materials comprise boric acid: nitrate salt: sodium bicarbonate: the feldspar is 15: 20: 25: 40, mixing the mixture by using a mixer after compounding so as to uniformly mix the waste incineration fly ash and the auxiliary materials;
(2) putting the uniformly mixed mixture into a ball making machine, and pressing under the pressure of 6MPa to prepare a fly ash block body of 30cm multiplied by 30 cm;
(3) melting fly ash block in a melting furnace at 1600 deg.C for 45 min to burn, decompose and gasify dioxin and organic substances, discharging residual slag at 810 deg.C to remove chlorine, and forming solidified inorganic substance; a small part of heavy metals and salts contained in the fly ash form secondary fly ash, and the other parts are melted into liquid slag;
(4) after the melting is finished, the liquid slag flows into water quenching treatment equipment for water quenching treatment, the density is increased, and a glass solidified body with a glass phase of 92 percent is formed;
(5) the ratio of the glass solidified body to the mineral active material is 75: and 25, homogenizing and grinding by using a grinding machine to obtain the high-performance concrete admixture.
In the step (5), the mineral active materials are blast furnace slag, vitrified micro bubbles, alunite and anhydrite, wherein the blast furnace slag: vitrification of the micro-beads: alunite: the anhydrite is 30: 25: 30: 15.
the melting negative pressure of the fly ash block body in the melting furnace is 900-1000 Pa.
According to the GB/T51003-2014 mineral admixture application technical specification, the high-performance concrete admixture has the activity index of 85 d and the fluidity ratio of 105 percent.
Example 2
(1) Taking 1 ton of waste incineration fly ash, and compounding the waste incineration fly ash with auxiliary materials, wherein the waste incineration fly ash: the auxiliary materials are 90: 10, wherein the auxiliary materials comprise boric acid: nitrate salt: sodium bicarbonate: the feldspar is 20: 15: 30: 35, mixing the mixture by using a mixer after compounding so as to uniformly mix the waste incineration fly ash and the auxiliary materials;
(2) putting the uniformly mixed mixture into a ball making machine, and pressing under the pressure of 10MPa to prepare a fly ash block of 40cm multiplied by 40 cm;
(3) melting fly ash block in melting furnace at 1400 deg.C for 60 min to obtain dioxin and organic matter capable of being burnt, decomposed and gasified, and discharging residual slag at 810 deg.C to remove chlorine and form solidified inorganic matter; a small part of heavy metals and salts contained in the fly ash form secondary fly ash, and the other parts are melted into liquid slag;
(4) after the melting is finished, the liquid slag flows into water quenching treatment equipment for water quenching treatment, the density is increased, and a glass solidified body with 90% of glass phase is formed;
(5) the ratio of the glass solidified body to the mineral active material is 80: and 20, homogenizing and grinding by a grinding machine to obtain the high-performance concrete admixture.
In the step (5), the mineral active materials are blast furnace slag, vitrified micro bubbles, alunite and anhydrite, wherein the blast furnace slag: vitrification of the micro-beads: alunite: anhydrite is 45: 15: 20: 20.
the melting negative pressure of the fly ash block in the melting furnace is 1100-1200 Pa.
According to the GB/T51003-2014 mineral admixture application technical specification, the high-performance concrete admixture has the activity index of 90% at 28d and the fluidity ratio of 110%.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (3)
1. The production process for preparing the concrete admixture by utilizing the waste incineration fly ash molten glass solidified body is characterized by comprising the following steps of:
(1) compounding waste incineration fly ash and auxiliary materials, wherein the waste incineration fly ash: the auxiliary materials are 90: 10-80: 20, mixing the mixture by using a mixer after compounding so as to uniformly mix the waste incineration fly ash and the auxiliary materials;
(2) putting the uniformly mixed mixture into a briquetting machine, and pressing under the pressure of 6-10 MPa to prepare fly ash blocks of 30cm multiplied by 30 cm-40 cm multiplied by 40 cm;
(3) putting the fly ash block into a melting furnace for melting, wherein dioxin and organic matters can be combusted, decomposed and gasified in the melting process, chlorine salt is melted into liquid at 810 ℃, the liquid is discharged through a slag discharge port, and inorganic matters form a solidified body; a small part of heavy metal and salt contained in the fly ash form secondary fly ash, the secondary fly ash is collected and returned for treatment, and other parts are melted into liquid slag;
(4) after the melting is finished, the liquid slag flows into water quenching equipment for water quenching treatment, and a glass solidified body with the glass phase being equal to or larger than 90% is formed;
(5) homogenizing the glass solidified body and the mineral active material, and grinding by a grinding machine to obtain the high-performance concrete admixture, wherein the glass solidified body: the mineral active material is 90: 10-80: 20;
the auxiliary materials in the step (1) are a mixture of boric acid, nitrate, sodium bicarbonate and feldspar, wherein the boric acid: nitrate salt: sodium bicarbonate: the feldspar accounts for 15-20: 15-20: 25-35: 30-40 parts of;
the mineral active materials in the step (5) are blast furnace slag, vitrified micro bubbles, alunite and anhydrite, wherein the blast furnace slag: vitrification of the micro-beads: alunite: the anhydrite accounts for 30-45 percent: 20-30: 20-30: 10 to 20.
2. The process for producing a concrete admixture according to claim 1, wherein: the temperature in the melting furnace is 1400-1600 ℃, and the melting time is 45-60 minutes.
3. The process for producing a concrete admixture according to claim 1, wherein: the melting negative pressure of the fly ash block in the melting furnace is 900-1200 Pa.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113666687A (en) * | 2021-07-16 | 2021-11-19 | 中国科学院武汉岩土力学研究所 | Method for preparing baking-free floor tile by using household garbage incineration fly ash composite material |
| CN114988736A (en) * | 2022-04-18 | 2022-09-02 | 江汉大学 | Concrete admixture and preparation method thereof |
| CN116197209A (en) * | 2023-01-17 | 2023-06-02 | 广西凯玺有色金属有限公司 | Cleaning treatment method for calcium arsenate glass solidification and application thereof |
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2021
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Patent Citations (6)
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| JPH09227181A (en) * | 1996-02-27 | 1997-09-02 | Sumikin Kashima Kouka Kk | Treatment of molten slag or molten flied ash |
| CN107999520A (en) * | 2017-12-28 | 2018-05-08 | 武汉都市环保工程技术股份有限公司 | Method and device for treating and recycling waste incineration fly ash |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113666687A (en) * | 2021-07-16 | 2021-11-19 | 中国科学院武汉岩土力学研究所 | Method for preparing baking-free floor tile by using household garbage incineration fly ash composite material |
| CN114988736A (en) * | 2022-04-18 | 2022-09-02 | 江汉大学 | Concrete admixture and preparation method thereof |
| CN116197209A (en) * | 2023-01-17 | 2023-06-02 | 广西凯玺有色金属有限公司 | Cleaning treatment method for calcium arsenate glass solidification and application thereof |
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Application publication date: 20210518 |