CN108980853A - Incineration of refuse flyash and percolate cooperative processing method and device - Google Patents
Incineration of refuse flyash and percolate cooperative processing method and device Download PDFInfo
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- CN108980853A CN108980853A CN201811063598.3A CN201811063598A CN108980853A CN 108980853 A CN108980853 A CN 108980853A CN 201811063598 A CN201811063598 A CN 201811063598A CN 108980853 A CN108980853 A CN 108980853A
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- percolate
- flying dust
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2700/00—Ash removal, handling and treatment means; Ash and slag handling in pulverulent fuel furnaces; Ash removal means for incinerators
- F23J2700/003—Ash removal means for incinerators
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- General Engineering & Computer Science (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention relates to offal treatments and application technology as the second resource field, more particularly, to a kind of incineration of refuse flyash and percolate cooperative processing method and device.The incineration of refuse flyash and percolate cooperative processing method include the following steps: that (a) carries out leaching processing to flying dust using percolate；(b) after leaching processing, take flying dust dry, heat treatment.Described device includes leaching unit and heating unit；The leaching unit includes that percolate installs container and flying dust packed column；The percolate installs to be connected at the top of container and flying dust packed column.The present invention carries out leaching processing to flying dust with percolate, has pore structure abundant after fly ash granule accumulation, can effectively adsorb pollutant in retention concentrate；Percolate can dissolve out the harmful heavy metal in flying dust, reduce the Leaching of flying dust.To leaching, treated that flying dust carries out heating harmless treatment, and Leaching of Heavy Metals concentration further decreases, and has reached standard limited value requirement, can be used as construction material use.
Description
Technical field
The present invention relates to offal treatment and application technology as the second resource field, more particularly, to a kind of incineration of refuse flyash with
Percolate cooperative processing method and device.
Background technique
Film concentrate is that " biochemical treatment+UF membrane (nanofiltration/reverse osmosis) " group technology processing landfill leachate obtains
By-product compares landfill leachate, inorganic salts and persistent organic pollutants containing high concentration.Currently, film concentrate
Processing technique mainly has advanced oxidation, evaporation, membrane distillation etc., but in practical engineering applications, these technologies are difficult to stablize fortune more
Row.Nanofiltration membrane concentrate is in brownish black, and containing a large amount of humus materials, COD concentration is high, usually 1000-5000mg/L, this
Also contain Ca, Mg, Ba, SO outside4 2-Etc. the heavy metal ion such as divalent salt ion and Cd, Zn, Pb, Cr.Compared to reverse osmosis concentrated liquid,
The more difficult disposition of nanofiltration membrane concentrate.
The by-product that flying dust is generated as consumer waste incineration, because of the high poison of the heavy metal containing high leaching concentration and trace
Property persistent organism, be managed by China as hazardous waste, needed to enter after harmless treatment in principle dangerous useless
Object landfill yard, but since the storage capacity of hazardous waste landfill is limited and costly, " household refuse landfill sites contamination control mark
It is quasi- " (GB 16889-2008) allow it to enter household refuse landfill sites after solidification and stabilization to fill.But to " life rubbish
Rubbish landfill yard contamination control standard " (GB 16889-2008) implement to find when assessment, flying dust pre-processes not up to standard, non-subregion and fills out
It buries, easily cause the problems such as percolate guide system silting more, the risk that heavy metal leaches pollution environment once again is higher.
In view of this, the present invention is specifically proposed.
Summary of the invention
The first object of the present invention is to provide a kind of incineration of refuse flyash and percolate cooperative processing method, the collaboration
The method of processing can dissolve out harmful heavy metal in flying dust, reduce the Leaching of flying dust, and reduce pollutant in percolate
Concentration realizes " treatment of wastes with processes of wastes against one another " comprehensive utilization of resources.
The second object of the present invention is to provide a kind of incineration of refuse flyash and cooperates with processing unit, described device with percolate
Structure is simple, obvious processing effect, and resource utilization rate is high.
In order to realize above-mentioned purpose of the invention, the following technical scheme is adopted:
Incineration of refuse flyash and percolate cooperative processing method, include the following steps:
(a) leaching processing is carried out to flying dust using percolate；
(b) after leaching processing, take flying dust dry, heat treatment.
The method that incineration of refuse flyash of the present invention cooperates with processing with percolate carries out leaching to flying dust with percolate
It handles, the derivative by-product that flying dust is disposed as domestic rubbish disposal, there is pore structure abundant after particle packing, it can
Effectively pollutant in absorption retention concentrate, mainly including organic matter etc.；Meanwhile percolate can be by the harmful huge sum of money in flying dust
Belong to dissolution, the Leaching of flying dust is effectively reduced.Also, to leaching, treated after flying dust carries out heating harmless treatment,
Leaching of Heavy Metals concentration further decreases, and it is corresponding to have reached " household refuse landfill sites contamination control standard " (GB16889-2008)
Limit value requirement, the flying dust slag after harmless treatment can be used as construction material use.
Preferably, the percolate is percolation liquid membrane concentrate.It is furthermore preferred that the percolate is that percolate nanofiltration membrane is dense
Contracting liquid.
Compared to landfill leachate, film concentrate contains the inorganic salts and persistent organic pollutants of high concentration.Wherein, nanofiltration
Film concentrate is in brownish black, and containing a large amount of humus materials, COD concentration is high, compares reverse osmosis concentrated liquid, nanofiltration membrane concentrate
Processing disposition difficulty is bigger.The present invention cooperates with processing with percolate nanofiltration membrane concentrate by incineration of refuse flyash, and nanofiltration membrane is dense
Contracting liquid can dissolve out poisonous metal in flying dust, reduce the Leaching of flying dust, also, flying dust can reduce it is organic etc. in percolate
The concentration of pollutant reduces COD.
Preferably, in the step (a), leaching processing is carried out to flying dust using percolate, until leachates coloration and electricity
Conductance is constant, reaches leaching terminal.
Specifically, water outlet can be started with filled column as timing point, successively leachates then are taken every 10-12h, measure coloration
And conductivity illustrates the nocuousness weight that percolate has been fully dissolved out in flying dust when leachates coloration and constant stable conductivity
The substances such as metal, processing terminate for leaching, reaches leaching terminal.
Preferably, the rate of the leaching processing is 40-80mL/h.
The rate of leaching processing has more important meaning to the effect that leaching is handled, by the rate for limiting leaching processing
Within the above range, it comes into full contact with percolate with fly ash granule to exchange, effectively the pollutant in absorption retention percolate, and fills
Divide and dissolves out the harmful heavy metal etc. in flying dust.As in different embodiments, the rate of the leaching processing can for 40mL/h,
45mL/h, 50mL/h, 55mL/h, 60mL/h, 65mL/h, 70mL/h, 75mL/h, 80mL/h etc..
Preferably, when the leaching is handled, the packed height of flying dust is 5-25cm.
Using above-mentioned flying dust packed height, fly ash granule is set sufficiently to retain the pollutant in percolate, while simultaneous
Gu Youxiao is dissolved out and is eluted the harmful heavy metal in flying dust etc..
As in different embodiments, the packed height of flying dust can for 5cm, 6cm, 7cm, 8cm, 9cm, 10cm, 11cm,
12cm, 13cm, 14cm, 15cm, 16cm, 17cm, 18cm, 19cm, 20cm, 21cm, 22cm, 23cm, 24cm, 25cm etc.
Preferably, before leaching processing, pre- full water process is carried out to flying dust using percolate.It is furthermore preferred that the pre- full water
The full water liquid-solid ratio of processing is 0.6-1L/kg, preferably 0.7-0.9L/kg, more preferably 0.8L/kg.
Pre- full water process is carried out to flying dust using percolate, after infiltrating fly ash granule first by percolate, then carries out leaching
Processing improves wellability, and then improves elution efficiency.
Preferably, the method for the leaching processing includes: to make flying dust filled column containing flyash ingredient, using percolate pair
Flying dust filled column carries out leaching processing.It is furthermore preferred that the flying dust filled column includes quartz sand, flying dust, quartz sand from the bottom to top.
Nylon wire interval is preferably used between quartz sand and flying dust.
Preferably, the partial size of the quartz sand is 60-100 mesh, preferably 70-90 mesh, more preferably 80 mesh.More preferably
, the filling height of the quartz sand is 4-5cm.
Preferably, the aperture of the nylon wire is 0.08-0.12mm, preferably 0.09-0.11mm, more preferably 0.1mm.
Preferably, the temperature of the heat treatment is 300-1200 DEG C.It is furthermore preferred that the temperature of the heat treatment is
800-1200℃。
After above-mentioned heat treatment, the organic matter through fly ash granule absorption retention decomposes removing under heat effect, also,
After heat treatment, the heavy metal in fly ash granule can be effectively removed, and as the temperature increases, raising heavy metal such as Pd,
The removal rate of Cd, Zn, Cu, Cr etc. further decrease the Leaching Heavy Metals of flying dust.
Preferably, the time of the heat treatment is 0.2-2h, preferably 0.5-1h.
Preferably, heated under air atmosphere.It is furthermore preferred that air mass flow is 1-3L/min, preferably 2L/
min。
Preferably, the tail gas that the heat treatment generates discharges after soda acid absorption processing.
The present invention also provides a kind of incineration of refuse flyash, and processing unit, including leaching unit and heating are cooperateed with percolate
Unit；The leaching unit includes that percolate installs container and flying dust packed column；The percolate installs container and flying dust is filled
Column top connection.
Incineration of refuse flyash of the present invention cooperates with processing unit with percolate, and structure is simple, and percolate is installed and is held
Device is connected to flying dust packed column, is carried out leaching processing to flying dust using percolate as leaching liquid, is reduced the Leaching of flying dust,
And the concentration of pollutant in percolate is reduced, obvious processing effect is easy to operate.
Preferably, the percolate is installed and is connected between container and flying dust packed column by conduit.On the conduit preferably
It is provided with flow control valve, to adjust the rate of leaching processing.
Preferably, the flying dust packed column includes cylinder and filler, and the filler is filled in cylinder, and the filler is under
Supreme includes quartz sand layer, flying dust layer, quartz sand layer.Nylon wire interval is preferably used between quartz sand layer and flying dust layer.It is more excellent
Choosing, it is provided with uniform liquid distributor above the filler, so that percolate, after uniform liquid distributor, uniformly leaching is on filler.
The cylinder of packed column can be selected according to actual needs, it is preferred to use Organic glass column avoids corroding.
Preferably, the cylinder bottom is provided with leachates buffer area, the leachates handled for buffering leaching.Institute
It states leachates buffer area bottom and is provided with water check valve, for opening or closing leaching treatment process.
Preferably, the percolate installs container top and is provided with injection port, air inlet pipe and exhaust outlet.The air inlet pipe is prolonged
It extends to percolate and installs bottom in container.So that leaching process carry out under constant-pressure conditions.As percolate installation container can
Using Markov bottle.
Preferably, the heating unit includes heating furnace, heating container, tail gas clean-up portion, and the heating furnace is for installing
Leaching treated flying dust, the heating furnace heat the flying dust being placed in heating container, the tail gas clean-up portion
It is connected to heating furnace.The tail gas clean-up portion mainly includes the reagent that soda acid absorbs processing.
Heating furnace is provided with thermocouple and furnace temperature control, for detecting and regulating and controlling heating furnace to the heat treatment temperature of flying dust
Degree.It is provided with furnace body thermal insulation layer on the outside of the furnace body of heating furnace, for heat-insulated to furnace insulation.
Preferably, the heating unit further includes air bottle, and the air bottle is connected to the heating furnace, is used for heating
Air is passed through in furnace.It is provided with flowmeter between the air bottle and the heating furnace, for adjusting the air for being sent into heating furnace
Flow.
Compared with prior art, the invention has the benefit that
(1) incineration of refuse flyash of the present invention and percolate cooperative processing method, drench flying dust with percolate
Filter is handled, the derivative by-product that flying dust is disposed as domestic rubbish disposal, has pore structure abundant, energy after particle packing
Pollutant in enough effectively absorption retention concentrates, mainly including organic matter etc.；Meanwhile percolate can be by the nocuousness weight in flying dust
The Leaching of flying dust is effectively reduced in metal dissolving；
(2) processing method of the present invention, to leaching, treated after flying dust carries out heating harmless treatment, a huge sum of money
Belong to leaching concentration to further decrease, has reached " household refuse landfill sites contamination control standard " (GB 16889-2008) and accordingly limited
Value requires, and the flying dust slag after harmless treatment can be used as construction material use；
(3) incineration of refuse flyash of the present invention cooperates with processing unit with percolate, and structure is simple, and percolate is installed
Container is connected to flying dust packed column, carries out leaching processing to flying dust using percolate as leaching liquid, reduces the leaching poison of flying dust
Property, and the concentration of pollutant in percolate is reduced, obvious processing effect is easy to operate.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of leaching unit provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of heating unit provided in an embodiment of the present invention.
Appended drawing reference:
1- percolate installs container；2- flying dust packed column；3- heating furnace；
4- heats container；5- tail gas clean-up portion；6- air bottle；
7- thermocouple；8- furnace temperature control；9- furnace body thermal insulation layer；
11- injection port；12- air inlet pipe；13- exhaust outlet；
14- flow control valve；The uniform liquid distributor of 21-；The first quartz sand layer of 22-；
The first nylon wire of 23-；24- flying dust layer；The second nylon wire of 25-；
The second quartz sand layer of 26-；27- leachates buffer area；28- water check valve；
29- receives container；61- flowmeter.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with the drawings and specific embodiments, but
Be it will be understood to those of skill in the art that it is following described embodiments are some of the embodiments of the present invention, rather than it is whole
Embodiment is merely to illustrate the present invention, and is not construed as limiting the scope of the invention.Based on the embodiments of the present invention, ability
Domain those of ordinary skill every other embodiment obtained without making creative work, belongs to guarantor of the present invention
The range of shield.The person that is not specified actual conditions in embodiment, carries out according to conventional conditions or manufacturer's recommended conditions.Agents useful for same
Or production firm person is not specified in instrument, is the conventional products that can be obtained by commercially available purchase.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Fig. 1 is the structural schematic diagram of leaching unit provided in an embodiment of the present invention；Fig. 2 is provided in an embodiment of the present invention adds
The structural schematic diagram of hot cell.The incineration of refuse flyash cooperates with processing unit, including leaching unit and heating list with percolate
Member.The leaching unit is used to carry out leaching processing to flying dust using percolate, and the heating unit is used for after leaching processing
Flying dust heated.
The leaching unit includes that percolate installs container 1 and flying dust packed column 2；The percolate installs container 1 and flies
It is connected at the top of grey packed column 2 by conduit.Flow control valve 14 is provided on the conduit, to adjust the rate of leaching processing.
The percolate installs and is provided with injection port 11, air inlet pipe 12 and exhaust outlet 13 at the top of container 1.The injection port 11
For the addition of percolate, preferably band cock provides closed environment.The air inlet pipe 12 extends to percolate and installs container 1
Interior bottom, so that leaching process carry out under constant-pressure conditions.Markov bottle can be used as the percolate installs container 1.
The flying dust packed column 2 includes cylinder and filler, and the filler is filled in cylinder, and the filler wraps from the bottom to top
Include the second quartz sand layer 26, the second nylon wire 25, flying dust layer 24, the first nylon wire 23, the first quartz sand layer 22, first stone
Uniform liquid distributor 21 is provided with above sand layer 22, so that percolate, after uniform liquid distributor 21, uniformly leaching is on filler.It fills out
The cylinder for filling column can be selected according to actual needs, it is preferred to use Organic glass column avoids corroding.
The flying dust layer 24 enables fly ash granule sufficiently to retain percolate through appropriate compacting, packed height 5-25cm
In pollutant, combine and effectively dissolve out and elute the harmful heavy metal in flying dust.The partial size of the quartz sand used is 60-
100 mesh, preferably 70-90 mesh, more preferably 80 mesh.The filling height of first quartz sand layer 22 and the second quartz sand layer 26
For 4-5cm.The aperture of the nylon wire is 0.08-0.12mm, preferably 0.09-0.11mm, more preferably 0.1mm.
The cylinder bottom is provided with leachates buffer area 27, the leachates handled for buffering leaching.The leaching
27 bottom of liquid buffer area is provided with water check valve 28 out, for opening or closing leaching treatment process.28 bottom of water check valve is set
It is equipped with and receives container 29, for receiving leachates.
The heating unit includes heating furnace 4, heating container 4, tail gas clean-up portion 5, air bottle 6, thermocouple 7, furnace temperature sky
Between 8, furnace body thermal insulation layer 9.High-temperature tubular electric furnace can be used in the heating furnace 4, and the thermocouple 7 is with furnace temperature control 8 for detecting
And regulate and control heating furnace 4 to the heat treatment temperature of flying dust.The heating container 4 treated for installing leaching flying dust, it is described
Corundum crucible can be used in heating container 4.The heating container 4 installs leaching treated flying dust, is placed in heating furnace 4, to flying
Ash is heated.The air bottle 6 is connected to one end of the heating furnace 4, for being passed through air into heating furnace 4.Institute
It states and is provided with flowmeter 61 between air bottle 6 and the heating furnace 4, for adjusting the flow for being sent into the air of heating furnace 4.It is described
Tail gas clean-up portion 5 is connected to the other end of the heating furnace 4, and the tail gas generated after heating heated furnace 4 is net through tail gas
It is discharged again after 5 purified treatment of change portion.The tail gas clean-up portion 5 mainly absorbs the reagent of processing including soda acid.
The furnace body thermal insulation layer 9 coats the outer wall for being set to heating furnace 4, heat-insulated for the furnace insulation to heating furnace 4.
Incineration of refuse flyash of the present invention and percolate cooperative processing method, include the following steps:
(1) according to quartz sand, nylon wire, flying dust, quartz sand, nylon wire, uniform cloth liquid are followed successively by cylinder from the bottom to top
The sequentially built flying dust filled column of device, filled column load after, using percolate nanofiltration membrane concentrate to flying dust filled column into
The pre- full water process of row；
(2) flow control valve that percolate installs container is closed, percolate is added in percolate nanofiltration membrane concentrate and is installed
In container, and it is spare to cover cock；
(3) percolate is installed and is connected at the top of container and flying dust filled column, and guarantee airtightness；It adjusts percolate and installs and hold
The speed that the flow control valve of device is handled to specified leaching opens the water check valve of flying dust filler column bottom, starts to carry out at leaching
Reason；
(4) water outlet is started as timing point with filled column, then takes a leachates every 10-12h, measure coloration and conductance
Rate reaches leaching terminal when the coloration of leachates and constant stable conductivity, leaching processing is completed；
(5) after the completion of leaching, the flying dust slag of leaching processing is taken out, after drying, is placed in high-temperature tubular electric furnace and is heated
Processing；The temperature of heat treatment is 300-1200 DEG C, and the time of heat treatment is 0.5h；Air mass flow is 2L/min.
The percolate nanofiltration membrane concentrate that various embodiments of the present invention use for percolate from garbage filling field through " anaerobic organism+
MBR+NF/RO " technical matters treatment process, the concentrate of NF unit retention, flying dust are garbage burning factory grate furnace burning process
The ash content that the flue gas of generation is retained through bag filter.
The design parameter of each step is as shown in table 1 below:
The condition of the different cooperative processing methods of table 1
| Number | Flying dust layer height | Leaching processing speed | Heating temperature |
| Embodiment 1 | 15cm | 40mL/h | — |
| Embodiment 2 | 15cm | 60mL/h | — |
| Embodiment 3 | 15cm | 80mL/h | — |
| Embodiment 4 | 5cm | 60mL/h | — |
| Embodiment 5 | 15cm | 60mL/h | — |
| Embodiment 6 | 25cm | 60mL/h | — |
| Embodiment 7 | 15cm | 60mL/h | 300℃ |
| Embodiment 8 | 15cm | 60mL/h | 600℃ |
| Embodiment 9 | 15cm | 60mL/h | 800℃ |
| Embodiment 10 | 15cm | 60mL/h | 1000℃ |
| Embodiment 11 | 15cm | 60mL/h | 1200℃ |
Note: wherein "-" indicates not heat-treated, and embodiment 2 and embodiment 5 are parallel laboratory test experimental example 1
Using China " the measurement rapid-digestion spectrophotometry of water chemical oxygen demand " (HJ/T399-2007), " water quality
The measurement silver nitrate titration method of chloride " (GB 11896-89) and " the measurement inductively coupled plasma of solid waste metallic element
Constitution spectrometry " the methods of (HJ 766-2015) to COD, chlorine in the untreated percolate nanofiltration membrane concentrate in the present invention
Compound and heavy metal are measured, and the results are shown in Table 2.China's " measurement inductive coupling of solid waste metallic element etc. is respectively adopted
Gas ions mass spectrography " (HJ 766-2015) and " solid waste Leaching leaching method horizontal vibration method " (HJ 557-2009)
Method is measured the content of beary metal and Leaching of flying dust untreated in the present invention, the results are shown in Table 3,4.
2 nanofiltration membrane concentrate chloride of table and Analysis of Heavy Metals
| Project | Measured value |
| pH | 6.54 |
| COD(mg/L) | 4833.0 |
| Chloride (mg/L) | 4944.4 |
| Pb(mg/L) | 1.62 |
| Zn(mg/L) | 1.73 |
| Cu(mg/L) | 0.34 |
| Cd(mg/L) | 0.0095 |
| Cr(mg/L) | 1.27 |
The Analysis of Heavy Metals of 3 flying dust of table
| Heavy metal | Cr | Cu | Zn | Cd | Pb |
| Content (mg/kg) | 140.4 | 694.4 | 7715 | 267.1 | 4039 |
The Leaching (mg/L) of 4 flying dust of table
| Project | Measured value | Standard limited value |
| pH | 11.84 | — |
| Pb | 21.34 | 0.25 |
| Zn | 9.3 | 100 |
| Cu | 0.91 | 40 |
| Cd | 0.0013 | 0.15 |
| Cr | 2.84 | 4.5 |
Note: standard limited value is 1 limit value of table in GB 16889-2008
The influence of effect is eluted to villaumite in flying dust and heavy metal in order to probe into the rate of different leaching processing, film is concentrated
The influence of COD removal effect in liquid is 15cm to flying dust layer height is fixed in embodiment 1-3,40mL/h, 60mL/ is respectively set
H, the leaching rate of 80mL/h cooperates with before and after the processing respectively according to national environmental protection professional standard HJ/T 399-2007, GB
11896-89 and HJ 766-2015 method carries out the measurement of fluid sample COD, chloride and heavy metal, according to HJ 557-2010
Method carries out Leaching analysis, test result such as table 5 to solid sample.
The different leaching rates of table 5 elute measure of merit result to villaumite in concentrate COD removal, flying dust and heavy metal
In order to probe into influence to villaumite in flying dust and heavy metal elution effect of the packed heights of different flying dust layers, dense to film
The influence of COD removal effect in contracting liquid, to the leaching rate for fixing 60mL/h in embodiment 4,5 and 6, the height of flying dust layer is distinguished
For 5cm, 15cm, 25cm, cooperate with before and after the processing respectively according to national environmental protection professional standard HJ/T 399-2007, GB
11896-89 and HJ 766-2015 method carries out the measurement of fluid sample COD, chloride and heavy metal, according to HJ 557-2010
Method carries out Leaching analysis, test result such as table 6 to solid sample.
The different flying dust layer heights of table 6 elute measure of merit result to villaumite in concentrate COD removal, flying dust and heavy metal
From upper table it is found that with flying dust layer packed height reduction, cooperate with treatment process in percolate nanofiltration membrane concentration
Liquid enhances the elution efficiency of pollutant in flying dust.
In order to probe into influence of the different heat treatment temperature to heavy metal volatility and leaching concentration in flying dust, to embodiment 7-
Fix the height of leaching rate and flying dust layer in 11, the temperature of heat treatment is respectively 300 DEG C, 600 DEG C, 800 DEG C, 1000 DEG C,
1200 DEG C, collaboration before and after the processing respectively according to national environmental protection professional standard HJ 766-2015 and HJ 557-2010 method into
The content of beary metal and Leaching of row solid sample are analyzed, test result such as table 7 and 8.
7 different heat treatment temperature of table is to heavy metal volatility test result (%) in flying dust
| Number | Pb | Zn | Cu | Cr | Cd |
| Embodiment 7 | 54.4 | 54.3 | 60.5 | 46.8 | 33.0 |
| Embodiment 8 | 58.6 | 58.6 | 65.6 | 61.2 | 57.0 |
| Embodiment 9 | 57.8 | 50.7 | 61.9 | 48.7 | 45.4 |
| Embodiment 10 | 76.1 | 59.2 | 69.2 | 57.0 | 66.6 |
| Embodiment 11 | 94.6 | 68.9 | 69.4 | 58.4 | 97.7 |
From upper table it is found that with heat treatment temperature raising, heavy metal Pb, Cd volatility significantly increase, Zn, Cu and
The increase amplitude of Cr volatility is relatively small.In entire heat treatment process, the maximum volatility of Pb, Zn, Cu, Cr, Cd are respectively
94.6%, 68.9%, 69.4%, 61.2%, 97.7%.
8 different heat treatment temperature of table is to Leaching of Heavy Metals concentration test result in flying dust
Note: standard limited value is 1 limit value of table in GB 16889-2008；ND, which refers to, to be not detected
It is found that the leaching concentration of heavy metal and leaching in flying dust can be further decreased by heat treatment from upper table
Toxicity, also, when treatment temperature reaches 800 DEG C or more, the leaching concentration of each heavy metal can achieve that " house refuse is filled out
Bury a contamination control standard (GB 16889-2008) " limit value requirement in table 1.Wherein, the leaching concentration of Cr is in and first increases to subtract afterwards
Small trend is primarily due to the Cr that Cr is mainly leached with hardly possible in flying dust3+Form exists, but under the high temperature conditions, Cr3+It is easy
It is converted into the biggish Cr of mobility6+, when temperature continues to increase, gradually it is sintered and further melts, package inner material is in turn
So that Cr6+Leaching rate reduce.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. incineration of refuse flyash and percolate cooperative processing method, which comprises the steps of:
(a) leaching processing is carried out to flying dust using percolate；
(b) it after leaching processing, takes flying dust dry, is heated.
2. incineration of refuse flyash according to claim 1 and percolate cooperative processing method, which is characterized in that the leaching
The rate of processing is 40-80mL/h；
Preferably, the percolate is percolation liquid membrane concentrate；
It is furthermore preferred that the percolate is percolate nanofiltration membrane concentrate.
3. incineration of refuse flyash according to claim 1 and percolate cooperative processing method, which is characterized in that the leaching
When processing, the packed height of flying dust is 5-25cm；
Preferably, before leaching processing, pre- full water process is carried out to flying dust using percolate；
It is furthermore preferred that the full water liquid-solid ratio of the pre- full water process is 0.6-1L/kg.
4. incineration of refuse flyash according to claim 1 and percolate cooperative processing method, which is characterized in that the heating
The temperature of processing is 300-1200 DEG C；
Preferably, the temperature of the heat treatment is 800-1200 DEG C；
Preferably, the time of the heat treatment is 0.2-2h；
It is furthermore preferred that the time of the heat treatment is 0.5-1h；
Preferably, heated under air atmosphere.
5. incineration of refuse flyash according to claim 1 and percolate cooperative processing method, which is characterized in that the step
(a) in, leaching processing is carried out to flying dust using percolate and reaches leaching terminal until leachates coloration and conductivity are constant；
Preferably, the method for the leaching processing includes: to make flying dust filled column containing flyash ingredient, using percolate to flying dust
Filled column carries out leaching processing；
It is furthermore preferred that the flying dust filled column includes quartz sand, flying dust, quartz sand from the bottom to top.
6. incineration of refuse flyash cooperates with processing unit with percolate, which is characterized in that including leaching unit and heating unit；It is described
Leaching unit includes that percolate installs container and flying dust packed column；The percolate installs to be connected at the top of container and flying dust packed column
It is logical.
7. incineration of refuse flyash according to claim 6 cooperates with processing unit with percolate, which is characterized in that the diafiltration
Liquid is installed and is connected between container and flying dust packed column by conduit；
Preferably, flow control valve is provided on the conduit.
8. incineration of refuse flyash according to claim 6 cooperates with processing unit with percolate, which is characterized in that the flying dust
Packed column includes cylinder and filler, and the filler is filled in cylinder, and the filler includes quartz sand layer, flying dust from the bottom to top
Layer, quartz sand layer；
Preferably, uniform liquid distributor is provided with above the filler.
9. incineration of refuse flyash according to claim 6 cooperates with processing unit with percolate, which is characterized in that the heating
Unit includes heating furnace, heating container, tail gas clean-up portion, the heating furnace treated for installing leaching flying dust, it is described plus
Hot stove heats the flying dust being placed in heating container, and the tail gas clean-up portion is connected to heating furnace；
Preferably, the heating furnace is provided with thermocouple and furnace temperature control；
Preferably, furnace body thermal insulation layer is provided on the outside of the furnace body of the heating furnace；
Preferably, the heating unit further includes air bottle, and the air bottle is connected to the heating furnace.
10. incineration of refuse flyash according to claim 8 cooperates with processing unit with percolate, which is characterized in that the infiltration
Filtrate installs container top and is provided with injection port, air inlet pipe and exhaust outlet；
Preferably, the air inlet pipe extends to percolate and installs bottom in container；
Preferably, it is Markov bottle that the percolate, which installs container,；
Preferably, the cylinder bottom is provided with leachates buffer area；
It is furthermore preferred that leachates buffer area bottom is provided with water check valve.
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| CN109440479A (en) * | 2018-12-04 | 2019-03-08 | 浪莎针织有限公司 | A kind of method that bioleaching removes heavy metal antimony in polyester fiber fabric |
| CN113492147A (en) * | 2021-07-01 | 2021-10-12 | 厦门嘉戎技术股份有限公司 | Recycling treatment process for fly ash in waste incineration plant |
| CN114669587A (en) * | 2022-03-28 | 2022-06-28 | 中国环境科学研究院 | Method for leaching fly ash from domestic garbage co-processing membrane concentrated solution, obtained residue and application |
| WO2024125475A1 (en) * | 2022-12-12 | 2024-06-20 | 北京天地融创科技股份有限公司 | Burner, gasification device and waste incineration treatment system |
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