CN104291784B - A kind of incineration of refuse flyash method for innocent treatment - Google Patents
A kind of incineration of refuse flyash method for innocent treatment Download PDFInfo
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- CN104291784B CN104291784B CN201410249759.3A CN201410249759A CN104291784B CN 104291784 B CN104291784 B CN 104291784B CN 201410249759 A CN201410249759 A CN 201410249759A CN 104291784 B CN104291784 B CN 104291784B
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- microwave
- coupling agent
- incineration
- refuse flyash
- microwave coupling
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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
- Y02W30/82—Recycling of waste of electrical or electronic equipment [WEEE]
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Abstract
The invention discloses a kind of incineration of refuse flyash method for innocent treatment, comprise the steps: that incineration of refuse flyash is sufficiently mixed with a small amount of microwave coupling agent by (1), and add suitable quantity of water and through forming machine granulating and forming；(2) microwave coupling agent is embedded again in shaped granule periphery；(3) the shaped granule feeding industrial microwave oven after buried powder is carried out microwave to melt, melted rear slag and microwave coupling agent sieving separating；(4) the microwave coupling agent after separating returns to be used as buried powder again.The present invention can rely on Self substances microwave absorbing property in microwave field in microwave coupling agent and flying dust, make in flying dust external heat and be brought rapidly up melting, major part heavy metal is solidified while dioxin thoroughly decomposes in flying dust, microwave coupling agent after separation is recyclable repeats use again, the method overcomes the shortcoming that conventional melt mode energy consumption is big, the thermal efficiency is low.
Description
Technical field
The present invention relates to a kind of environmental pollution improvement method, particularly to the harmless treatment side of a kind of incineration of refuse flyash
Method.
Background technology
Domestic garbage burning electricity generation technology has the double benefit of environmental protection and the energy, it has also become the development for the treatment of of urban garbage
Direction.China's waste incineration and generating electricity is rapid in development in recent years, and rubbish is by generation about 3～the flying dust of 5% after burning, and these burn
Burning containing toxicants such as a considerable amount of dioxin, heavy metals in flying dust, both material has the strongest bioaccumulation effect
Should, once entering environment will be absorbed by human body eventually through food chain, harm human survival and health.Total according to national environmental protection
Office's regulation, incinerator ash flying dust is hazardous waste, it is necessary to process.At present, fill after domestic commonly used cement solidification
Method processes flying ash, and the method major defect is: (1), must use the highest cement/flying dust ratio, consumes substantial amounts of
Cement, increase-volume, increase matter serious, it is impossible to realize refuse process minimizing requirement；(2) when, cement solidification needs enough operations
Between；(3), cement solidification is with the heavy metal in stable flying dust as main target, it is impossible to two English decomposing or stablizing in flying dust, is
Its another deadly defect.(4), flying dust oozes the heavy metals such as drip property Zn, Pb, Cd of exceeding standard and is essentially relying on the alkalescence that cement provides
The chemical state kept relative stability under environment, stable in firming body for physically, after cement solidification, heavy metal finally accumulates
In the environment, its long-time stability it cannot be guaranteed that, it is impossible to realize the most innoxious.(5) product after, stable be useless,
Non-renewable resources, it is impossible to realize the resource of flying ash.
Melted is the new technology of development in recent years, and it can be taken into account dioxin and decompose and the process requirement of heavy metals immobilization, produce
Raw slag also can comprehensively utilize, and has clear superiority at " minimizing, innoxious, resource " aspect.Melting furnace is divided by thermal source
For electroheating type melting furnace and fuel type melting furnace two class, electroheating type melting furnace mainly includes electric arc melting stove, plasma fusion
Stove, resistance melting furnace etc.；Fuel type melting furnace mainly includes that reflecting surface formula melting furnace, surfaces of revolution formula melting furnace, eddy current type are melted
Stove, remaining char formula melting furnace etc..Conventional melt method needs flying dust by being heated to melting from external high temperature (>=1400 DEG C)
State, need to consume mass energy, and operating cost is high；It addition, for electroheating type melting furnace, in flying dust, high chlorine, high-carbon can carry
Carry out the adverse effect such as the erosion of refractory material and the scaling loss of graphite electrode；Fuel type melting furnace need to rely on a large amount of auxiliary fuel and
Air maintains high temperature, so can produce a large amount of flue gas containing volatile heavy metal, needs to be equipped with complicated tail gas clean after kiln
Change facility.
Heating using microwave has the advantage that conventional heating cannot realize, such as firing rate energy-conservation, that be exceedingly fast and sintering velocity.
" focus " effect is the key property of heating using microwave, heating effect quick produced by this effect be conduction and convection type institute
Do not reach, it may appear that hot-spot phenomenon.Patent CN103601526A discloses a kind of medical refuse burning flyash microwave and burns
The method of porous ceramic grain processed, this patent is by being mixed into rich in SiO in medical refuse burning flyash2Adminicle in, be a granulated into
In microwave field, carry out periphery powder embedded sintering after type, under less than flying dust fusing point, be prepared as haydite.
Summary of the invention
The present invention solves technical problem present in known technology and one safely and effectively incineration of refuse flyash is provided
Processing method, the method can be by Self substances microwave absorbing property in microwave field in microwave coupling agent and flying dust so that
External heat be brought rapidly up melting in flying dust, a solidification major part huge sum of money while dioxin in flying dust is the most thoroughly decomposed
Belonging to, solid slag can utilize as building materials, and microwave coupling agent is reclaimed after separating and repeated to use again.
The present invention solves that technical problem is adopted the technical scheme that present in known technology: a kind of waste incineration flies
Ash method for innocent treatment, it is characterised in that comprise the steps: that (1) is by abundant with a small amount of microwave coupling agent for incineration of refuse flyash
Mixing, and add suitable quantity of water and through forming machine granulating and forming；(2) microwave coupling agent is embedded again in shaped granule periphery；(3) will bag
Particle raw material feeding industrial microwave firing equipment after burying carries out microwave and melts, and melted rear slag crosses screening with microwave coupling agent
From；(4) the microwave coupling agent after separating returns to be used as buried powder again.
Described microwave coupling agent is one or both in the microwave susceptible media such as carborundum, carbon dust, ferroso-ferric oxide
The mixture formed, the particle diameter of microwave coupling agent is below 300 μm.
Described incineration of refuse flyash is 20: 1～5: 1 with the mass ratio of microwave coupling agent.
The operating frequency of described industrial microwave firing equipment is 915 megahertzs or 2450 megahertzs, input power be 5～
300 kilowatts, the heat time is 5～15 minutes.
The present invention has the advantage that with good effect: the internal microwave coupling agent added of (1) shaped granule and flying dust are certainly
Carbon component (activated carbon and unburned carbon residue) that body contains, Fe3O4、Fe2O3、Al2O3Deng inhaling ripple material, under microwave, these things
Matter temperature will raise rapidly, be internally formed " focus " effect at shaped granule；The microwave coupling agent of periphery embedding simultaneously is the rapidest
Heat up, transfer heat to the particle of surrounding, form focus at particle surface, can be by thorough for dioxin in flying dust in very short time
The end, decomposes；(2) by granulating and forming, decrease particle internal voids, increase intergranular contact area, accelerate reaction rate and
Shorten the reaction time, be quickly melted by flying dust under inside and outside " focus " effect simultaneously, save the melted time and the energy disappears
Consumption.(3) the method energy utilization rate is high, overcomes the shortcomings such as conventional melt mode energy consumption is big, the thermal efficiency is low, and is not required to be passed through greatly
Amount air, also will not produce the problems such as the erosion to refractory material.
Accompanying drawing explanation
Fig. 1 is the flow chart of the embodiment of the present invention.
Detailed description of the invention
For the summary of the invention of the present invention, feature and effect can be further appreciated that, hereby enumerate following example, and coordinate accompanying drawing
Describe in detail as follows:
Refer to Fig. 1.
Embodiment 1:
Certain burning city domestic garbage chemical composition is shown in Table 1, the clinker ignition loss of flying dust, heavy metal, dioxin and chlorinity
It is shown in Table 2.Incineration of refuse flyash and carborundum powder are put in blender by the mass ratio of 20: 1 and is sufficiently mixed, add deionization
Water granulating and forming, puts into shaped granule black-fead crucible, and adds embedding carbon dust (particle diameter≤250 μm), put into by black-fead crucible
Carrying out buried powder in industrial microwave oven to melt, the operating frequency of microwave agglomerating furnace is 2.45GHz, and the power of micro-wave oven is 5kW, heating
5 minutes time, the cooled slag that obtains in crucible, slag and buried powder sieving separating, after separation, microwave coupling agent gives over to buried powder
Standby, in slag, dioxin concentration is reduced to 0.021ng TEQ/g after tested, and the Leaching Heavy Metals test result of slag is shown in
Table 3, endangers concentration less than heavy metal contaminants concentration limit in GB16889-2008 in leachate.
The chemical composition (%) of fly ash from burning city domestic garbage in table 1 embodiment 1
| Sample | SiO2 | CaO | Al2O3 | Fe2O3 | MgO | K2O | Na2O | SO3 | Cl | P2O5 | TiO2 | ZnO |
| Flying ash | 29.78 | 21.95 | 18.3 | 4.12 | 2.57 | 4.44 | 3.81 | 5.89 | 4.99 | 1.9 | 1.26 | 0.16 |
Incineration of refuse flyash clinker ignition loss, heavy metal, dioxin and chlorinity in table 2 embodiment 1
The leaching concentration mg/l of heavy metal in slag in table 3 embodiment 1
| Cu | Zn | Pb | Cd | Cr |
| 0.24 | 0.12 | 0.13 | 0.04 | 0.08 |
Embodiment 2:
Incineration of refuse flyash and carbon dust, with embodiment 1, are put in blender by incineration of refuse flyash by the mass ratio of 10: 1
It is sufficiently mixed, adds deionized water granulating and forming, shaped granule is put into black-fead crucible, and adds embedding ferroso-ferric oxide powder
(particle diameter≤300 μm), puts into black-fead crucible and carries out buried powder in industrial microwave oven and melt, and the operating frequency of microwave agglomerating furnace is
0.915GHz, the power of micro-wave oven is 30kW, 8 minutes heat times, the cooled slag that obtains in crucible, slag and buried powder mistake
Sieve separates, and after separation, to give over to buried powder standby in microwave coupling agent, and in slag, dioxin concentration is reduced to 0.025ng TEQ/ after tested
G, the Leaching Heavy Metals test result of slag is shown in Table 4, endangers concentration less than heavy metal in GB16889-2008 in leachate
Pollutant levels limit value.
The leaching concentration mg/l of heavy metal in slag in table 4 embodiment 2
| Cu | Zn | Pb | Cd | Cr |
| 0.18 | 0.21 | 0.09 | 0.07 | 0.14 |
Embodiment 3:
Incineration of refuse flyash and ferroso-ferric oxide powder, with embodiment 1, are put into mixed by the mass ratio of 5: 1 by incineration of refuse flyash
Glassware is sufficiently mixed, adds deionized water granulating and forming, shaped granule is put into black-fead crucible, and adds embedding four oxidations
Three iron powders (particle diameter≤200 μm), put into crucible and carry out buried powder in industrial microwave oven and melt, and the operating frequency of microwave agglomerating furnace is
2.45GHz, the power of micro-wave oven is 300kW, 15 minutes heat times, cooled obtains slag, slag and buried powder in crucible
Sieving separating, after separation, to give over to buried powder standby in microwave coupling agent, and in slag, dioxin concentration is reduced to 0.018ng after tested
TEQ/g, the Leaching Heavy Metals test result of slag is shown in Table 5, endangers concentration less than weight in GB16889-2008 in leachate
Metallic contaminants concentration limit value.
The leaching concentration mg/l of heavy metal in slag in table 5 embodiment 3
| Cu | Zn | Pb | Cd | Cr |
| 0.19 | 0.11 | 0.21 | 0.05 | 0.08 |
What above-described embodiment illustrated is domestic garbage incineration flyash novel technique for harmless treatment, the invention is not limited in life
Incineration of refuse flyash alive, applies also for medical refuse burning flyash.
Although the preferred embodiments of the present invention being described above in conjunction with accompanying drawing, but the invention is not limited in
The detailed description of the invention stated, above-mentioned detailed description of the invention is only schematically, is not restrictive, this area common
Technical staff, under the enlightenment of the present invention, in the case of without departing from present inventive concept and scope of the claimed protection, also may be used
To make a lot of form, within these belong to protection scope of the present invention.
Claims (3)
1. an incineration of refuse flyash method for innocent treatment, comprises the steps: that (1) is by incineration of refuse flyash and a small amount of microwave
Couplant is sufficiently mixed, and adds suitable quantity of water and through forming machine granulating and forming, described incineration of refuse flyash and microwave coupling agent
Mass ratio is 20: 1～5: 1；(2) microwave coupling agent is embedded again in shaped granule periphery；(3) the particle raw material after embedding are sent into
Industrial microwave firing equipment carries out microwave and melts, melted rear slag and microwave coupling agent sieving separating；(4) microwave after separating
Couplant returns and uses as buried powder again.
A kind of incineration of refuse flyash method for innocent treatment the most according to claim 1, it is characterised in that described microwave
Couplant is one or both mixtures formed in carborundum, carbon dust, ferroso-ferric oxide microwave susceptible medium, microwave coupling
The particle diameter of mixture is below 300 μm.
A kind of incineration of refuse flyash method for innocent treatment the most according to claim 1, it is characterised in that described industry is micro-
The operating frequency of Wave heating equipment is 915 megahertzs or 2450 megahertzs, and input power is 5～300 kilowatts, and the heat time is 5
～15 minutes.
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| CN104291784B true CN104291784B (en) | 2016-09-07 |
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| CN107030093A (en) * | 2017-05-03 | 2017-08-11 | 江苏天楹环保能源成套设备有限公司 | One kind combines washing and plasma fusion handles flying ash system |
| CN108380640B (en) * | 2018-02-12 | 2020-04-07 | 江苏天楹环保能源成套设备有限公司 | Method for treating fly ash by vacuum microwave carbothermic reduction |
| CN110124247A (en) * | 2019-05-31 | 2019-08-16 | 江苏天楹环保能源成套设备有限公司 | A kind of system of microwave treatment incineration of refuse flyash |
| CN110639926A (en) * | 2019-09-09 | 2020-01-03 | 启迪环境科技发展股份有限公司 | Composite ball for disposing incineration fly ash, and fusion treatment device and method |
| CN110723981A (en) * | 2019-10-11 | 2020-01-24 | 太原科技大学 | Method for preparing composite microwave absorbing material by using fly ash |
| CN113521637B (en) * | 2021-08-06 | 2022-06-24 | 宝武集团环境资源科技有限公司 | System and method for treating dioxin in incineration fly ash by continuous microwave hydrothermal method |
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| US5582573A (en) * | 1994-04-04 | 1996-12-10 | Applied Innovations, Inc. | Method for the treatment and stabilization of hazardous waste |
| AU2003206850A1 (en) * | 2002-02-21 | 2003-09-09 | Tioxide Group Services Limited | Red gypsum in civil engineering applications |
| CN103601526B (en) * | 2013-12-02 | 2015-12-02 | 天津城建大学 | The method of the firing porous haydite of a kind of medical refuse burning flyash microwave |
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