CN109719110A - A method of processing incineration of refuse flyash - Google Patents
A method of processing incineration of refuse flyash Download PDFInfo
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- CN109719110A CN109719110A CN201711024471.6A CN201711024471A CN109719110A CN 109719110 A CN109719110 A CN 109719110A CN 201711024471 A CN201711024471 A CN 201711024471A CN 109719110 A CN109719110 A CN 109719110A
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- incineration
- iron
- refuse flyash
- reducing agent
- based reducing
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Abstract
The present invention relates to a kind of methods for handling incineration of refuse flyash, first take incineration of refuse flyash, iron-based reducing agent is added into incineration of refuse flyash, stir, and are uniformly mixed；Wherein, iron-based reducing agent includes iron powder, and the additive amount of iron-based reducing agent is the 0.5-5% of incineration of refuse flyash gross mass；Organic sulfur chelating agent and water is added into step 1) treated incineration of refuse flyash again, stirs evenly, conserves.Stabilization effect of the present invention is good, compared with prior art, the solidification stablizing effect to Cr VI can be substantially improved；In treatment process, the solid chemicals amount of investment is small, and flying dust scale of construction amplification is small, the landfill pressure that can reduce that treated.
Description
Technical field
The present invention relates to a kind of methods more particularly to a kind of processing cadmium, lead, chromium combined pollution for handling incineration of refuse flyash
The method of domestic garbage incineration flyash makes cadmium therein, lead, chromium generate stable compound, will not be with household refuse landfill sites
In acid percolate dissolution, meet " household refuse landfill sites contamination control standard " (GB16889-2008), belong to rubbish and burn
Burn flying dust disposal field.
Background technique
Burning city domestic garbage is the important means of China's refuse disposal.According to statistics, National urban rubbish in 2011 is burnt
Burning amount is 2599.3 ten thousand tons, is such as the estimation of the amount of burning away the refuse 3% by flying dust amount, generates 780,000 tons of flying dusts national year.House refuse
Flying ash has been put into " National Hazard waste register " 2016, belongs to environmental improvement industry, HW18 incineration disposal residue.Life rubbish
Containing largely to ecological environment harmful heavy metal, such as lead, cadmium, chromium etc. in rubbish flying ash.The harm of heavy metal is it
It cannot be decomposed by the microorganisms and can be enriched with or be formed in vivo the stronger compound of other toxicity, pass through their meetings of food chain
Finally do harm to huamn body.Therefore, to prevent domestic garbage incineration flyash from constituting a threat to environment and the mankind, it is necessary to carry out appropriate
Conduct oneself well reason.According to " National Hazard waste register " 2016 domestic garbage incineration flyash, there are two types of disposal options, and it is " raw that one is satisfactions
Refuse landfill contamination control standard living " 6.3 requirements in (GB16889-2008), it is filled into household refuse landfill sites；Separately
One is satisfaction " cement kiln synergic processing solid waste pollution controls standard " (GB30485-2013), at cement kiln collaboration
It sets.It is limited to the limitation of domestic cement kiln synergic processing facility quantity and processing capacity.
Currently, most of the country flying dust is to fill after being handled by curing/stabilizing into household refuse landfill sites.
Common chemical stabilization stabilizer mainly has ferrous iron, sulfide, phosphate, organic sequestering agent and high-molecular chelating agent etc..
Patent of invention CN106316307A points out in solidification and stabilization processing method, cement solidification and the phases such as glass solidification, organic curing
Than, have it is at low cost, using convenient advantage, at home and abroad hazard waste landfill disposition aspect be widely applied and technology at
It is ripe.But the method exists to Zn2+、Pb2+Equal parts divalent both sexes heavy metal cation and high price heavy metal anion radical are such as
CrO4 2-The problem of constraint low efficiency, is stablized in equal solidifications.Amphoteric metal Zn2+、Pb2+Will form under high pH conditions zincate or
Person's plumbite and soluble salt is converted to by precipitating, and the anion radical of high price heavy metal such as CrO4 2-Deng in overbasic ring
There is very high migration in border.Accordingly, patented invention one kind is with slag, clinker, alkali-activator, hydroxyapatite
The composite passivated agent prescription of main component be used for flying dust stabilization processes, but the flying dust quality of the patent of invention with it is composite passivated
The mass ratio of agent is 3~6, i.e., medicament adding proportion is 16.7~33.3%, and adding proportion is higher, considerably increases transport and fills out
Bury cost.The mass ratio of the flying dust quality and composite passivant of patent of invention but the patent of invention is 3~6, i.e. medicament adds ratio
Example is 16.7~33.3%, and adding proportion is higher, considerably increases transport and landfill cost.Patent of invention (CN106178385A)
It proposes a kind of vulcanized sodium and ferrous sulfate is answered as compound stabilizer using sodium hydroxide and waterglass as composite exciting agent
Leaching of Heavy Metals concentration after flyash curing can be made to meet " hazardous waste judging standard leaching characteristic identification " with this two kinds formulas
GB5085.3-2007, but actually the medicament does not embody the effect of Cr in embodiment 1, and the Pb in embodiment 1
Leaching concentration is not able to satisfy " hazardous waste landfill contamination control standard " GB 18598-2001 and requires (Pb < 5mg/L).Therefore,
It is a kind of efficient and can simultaneously lead in stable flying dust, cadmium, chromium processing method be there is an urgent need to.
Summary of the invention
In view of the deficiencies of the prior art, a kind of method for handling incineration of refuse flyash of the present invention, it is steady to solve existing flying dust
Determine the ineffective or medicament addition ratio of agent, curing agent or chelating agent processing cadmium, lead, chromium combined pollution domestic garbage incineration flyash
The excessive problem of example, while promoting the stabilization effect to Cr VI.
In order to solve the above-mentioned technical problem, technical scheme is as follows: a method of processing incineration of refuse flyash,
Include the following steps:
1) incineration of refuse flyash is taken, iron-based reducing agent is added into incineration of refuse flyash, is stirred, is uniformly mixed；Wherein, iron-based to go back
Former agent includes iron powder, and the additive amount of iron-based reducing agent is the 0.5-5% of incineration of refuse flyash gross mass；
2) organic sulfur chelating agent and water are added into step 1) treated incineration of refuse flyash, stirs evenly, conserves.
Hexavalent chrome reduction in incineration of refuse flyash can be formed by iron-based reducing agent by trivalent using such method
Chromium, and incineration of refuse flyash itself is in alkalinity, and alkaline environment, trivalent chromium and hydroxide ion knot are formed in the case where adding water
It closes, is formed Cr (OH)3Precipitating, to realize stabilisation, reaches harmless treatment purpose；By the addition of organic sulfur chelating agent,
Can by flying dust cadmium and the heavy metals such as lead be converted to stable chelate and precipitate, to reach harmless treatment purpose.Entirely
In treatment process, the solid chemicals amount of investment is small, and flying dust scale of construction increasing degree is small after processing, not will increase landfill pressure.
Further, the incineration of refuse flyash is domestic garbage incineration flyash, and further, the waste incineration flies
Ash is cadmium, lead, chromium combined pollution domestic garbage incineration flyash, includes the pollutants such as chromium, lead, cadmium.
In step 1), the iron-based reducing agent further includes one or both of ferrous sulfate and frerrous chloride.Ferrous iron from
Son also has certain reducing power to Cr VI, and is water-soluble substances, in treatment process, it is water-soluble in, penetrate into flying dust
Intragranular portion, comes into full contact with Cr VI and reacts, and further promotes stabilization effect, and ferrous ion mutually acts synergistically with iron powder,
Compared with prior art, the stablizing effect to Cr VI can be substantially improved.Preferably, the iron-based reducing agent further includes sulfuric acid Asia
Iron.
In step 1), the additive amount of the iron-based reducing agent is the 1-3% of incineration of refuse flyash gross mass.
In step 1), mixing time 30-60s.
In step 1), iron-based reducing agent and incineration of refuse flyash are stirred by kneading machine.
In step 2), the additive amount of the organic sulfur chelating agent is the 0.5-3% of incineration of refuse flyash gross mass, and water adds
Dosage is the 20-30% of incineration of refuse flyash gross mass.Preferably, the additive amount of the organic sulfur chelating agent flies for waste incineration
The 1-2% of grey gross mass, the additive amount of water are the 24-26% of incineration of refuse flyash gross mass.
In step 2), first the water of the required additive amount of the organic sulfur chelating agent of required addition is dissolved, then by acquisition
Organic sulfur chelating agent aqueous solution is added in step 1) treated incineration of refuse flyash.It is made in this way by organic sulfur chelating agent is prewired
Aqueous solution may make organic sulfur chelating agent to mix with incineration of refuse flyash more abundant, improve processing quality.
As an alternative, in step 2), the organic sulfur chelating agent of required additive amount can be first weighed, then plus water is dilute
It releases, obtains the organic sulfur chelating agent aqueous solution that concentration is 2.5-10%, then the organic sulfur chelating agent aqueous solution is all added
Into incineration of refuse flyash.
In step 2), the organic sulfur chelating agent includes Sodium Dimethyldithiocarbamate (sodium dimethyl dithiocarbamate), TMT (three mercaptos
One or both of base triazine trisodium salt).
In step 2), mixing time 3-5min.Preferably 4-5min.
In step 2), curing time is 3 days or 3 days or more.Preferably 3 days or more.
Cadmium, lead, chromium combined pollution domestic garbage incineration flyash are carried out using iron-based reducing agent and organic sulfur chelating agent steady
Determining processing, cadmium, lead, chromium after improvement in consumer waste incineration will not be molten with the acid percolate in household refuse landfill sites
Out, meet " household refuse landfill sites contamination control standard " (GB16889-2008).
Compared with prior art, beneficial effects of the present invention are as follows:
(1) stabilization effect is good, compared with prior art, can effectively promote the stablizing effect to Cr VI, the coefficient of stabilization of Cr VI
Up to 95.7% or more；
(2) in treatment process, the solid chemicals amount of investment is small, and flying dust scale of construction amplification is small, compared with prior art, after can reducing processing
Landfill pressure；
(3) process flow is simple, and the stabilization processes to pollutants such as chromium, lead, cadmiums can be realized by two steps.
Detailed description of the invention
Fig. 1 is the process flow chart of the first embodiment of the invention.
Specific embodiment
Below with reference to the specific embodiment of Guangzhou MSW Incineration Plant, the invention will be further described, so that
Those skilled in the art can better understand the present invention and can be practiced, but illustrated embodiment is not as to of the invention
It limits.Concrete technology flow process is following (Fig. 1):
A) it by screw(-type) feeder and metering device, accurately weighs 800kg domestic garbage incineration flyash and enters kneading machine；
B) by screw(-type) feeder and metering device, 16kg (2%) iron powder is accurately conveyed to kneading machine, stirs 1min；
C) by metering pump, 16kg (2%) liquid Sodium Dimethyldithiocarbamate is accurately conveyed to 3# feed bin；
D) pass through metering pump, accurately the process water of conveying 200kg (25%) to 3# feed bin；
E) the Sodium Dimethyldithiocarbamate solution in 3# feed bin is added to batch mixer, stirs 4min, blanking, after maintenance 3 days, sample detection.
Before stable operation, take 1 untreated flying dust sample as control sample, stabilization processes, and after conserving,
3 cured block samples (cured block 1#, 2#, 3#) is taken, according to " solid waste Leaching hac buffer method " HJ/T300 system
Standby leachate, then measures cadmium, chromium, lead concentration in leachate, the results are shown in Table 1.By 2% iron powder and 2% liquid
Body Sodium Dimethyldithiocarbamate treated flying dust sample, leaching concentration are below " household refuse landfill sites contamination control standard " (GB16889-
2008) it requires.
Table 1 adds stabilization processes Contrast on effect
Above embodiments are only to absolutely prove preferred embodiment that is of the invention and being lifted, and protection scope of the present invention is not
It is limited to this.Those skilled in the art's made equivalent substitute or transformation on the basis of the present invention, in guarantor of the invention
Within the scope of shield.Protection scope of the present invention is subject to claims.
Claims (10)
1. a kind of method for handling incineration of refuse flyash, which comprises the steps of:
1) incineration of refuse flyash is taken, iron-based reducing agent is added into incineration of refuse flyash, is stirred, is uniformly mixed；Wherein, iron-based to go back
Former agent includes iron powder, and the additive amount of iron-based reducing agent is the 0.5-5% of incineration of refuse flyash gross mass；
2) organic sulfur chelating agent and water are added into step 1) treated incineration of refuse flyash, stirs evenly, conserves.
2. the method according to claim 1, wherein the iron-based reducing agent further includes sulfuric acid Asia in step 1)
One or both of iron and frerrous chloride.
3. the method according to claim 1, wherein the additive amount of the iron-based reducing agent is rubbish in step 1)
The 1-3% of rubbish flying ash gross mass.
4. the method according to claim 1, wherein in step 1), mixing time 30-60s.
5. the method according to claim 1, wherein iron-based reducing agent and incineration of refuse flyash are logical in step 1)
Kneading machine is crossed to be stirred.
6. the method according to claim 1, wherein in step 2, the additive amount of the organic sulfur chelating agent is
The 0.5-3% of incineration of refuse flyash gross mass, the additive amount of water are the 20-30% of incineration of refuse flyash gross mass.
7. according to the method described in claim 4, it is characterized in that, in step 2, first by the organic sulfur chelating agent of required addition
It is dissolved with the water of required additive amount, step 1) then is added treated waste incineration in the organic sulfur chelating agent aqueous solution of acquisition
In flying dust.
8. the method according to claim 1, wherein in step 2, the organic sulfur chelating agent include Sodium Dimethyldithiocarbamate,
One or both of TMT.
9. the method according to claim 1, wherein in step 2, mixing time 3-5min.
10. the method according to claim 1, wherein curing time is 3 days or 3 days or more in step 2.
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| CN201711024471.6A CN109719110A (en) | 2017-10-27 | 2017-10-27 | A method of processing incineration of refuse flyash |
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Cited By (7)
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| CN112316352A (en) * | 2020-09-08 | 2021-02-05 | 馆陶县晴美环保科技有限公司 | Composition for solidifying waste incineration fly ash and preparation method and application thereof |
| CN112374751A (en) * | 2020-11-11 | 2021-02-19 | 浙江得铭智能环保科技有限公司 | Treatment method for green recycling of fly ash |
| CN112642838A (en) * | 2020-12-17 | 2021-04-13 | 西南科技大学 | High-quality utilization method of waste incineration fly ash |
| CN112723768A (en) * | 2020-12-28 | 2021-04-30 | 陈磊 | Fly ash cleaning method |
| CN112871945A (en) * | 2020-12-03 | 2021-06-01 | 嘉兴沃特泰科环保科技股份有限公司 | Liquid chelating agent for life landfill standard and preparation method thereof |
| CN113102467A (en) * | 2021-04-20 | 2021-07-13 | 瀚蓝绿电固废处理(佛山)有限公司 | Fly ash chelation treatment method capable of strengthening heavy metal stabilization and composite stabilizer |
| CN115069741A (en) * | 2022-05-13 | 2022-09-20 | 同济大学 | Method for deeply removing chlorine in household garbage incineration fly ash based on high-temperature treatment |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112316352A (en) * | 2020-09-08 | 2021-02-05 | 馆陶县晴美环保科技有限公司 | Composition for solidifying waste incineration fly ash and preparation method and application thereof |
| CN112374751A (en) * | 2020-11-11 | 2021-02-19 | 浙江得铭智能环保科技有限公司 | Treatment method for green recycling of fly ash |
| CN112871945A (en) * | 2020-12-03 | 2021-06-01 | 嘉兴沃特泰科环保科技股份有限公司 | Liquid chelating agent for life landfill standard and preparation method thereof |
| CN112642838A (en) * | 2020-12-17 | 2021-04-13 | 西南科技大学 | High-quality utilization method of waste incineration fly ash |
| CN112723768A (en) * | 2020-12-28 | 2021-04-30 | 陈磊 | Fly ash cleaning method |
| CN113102467A (en) * | 2021-04-20 | 2021-07-13 | 瀚蓝绿电固废处理(佛山)有限公司 | Fly ash chelation treatment method capable of strengthening heavy metal stabilization and composite stabilizer |
| CN113102467B (en) * | 2021-04-20 | 2022-03-18 | 瀚蓝绿电固废处理(佛山)有限公司 | Fly ash chelation treatment method capable of strengthening heavy metal stabilization and composite stabilizer |
| CN115069741A (en) * | 2022-05-13 | 2022-09-20 | 同济大学 | Method for deeply removing chlorine in household garbage incineration fly ash based on high-temperature treatment |
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Application publication date: 20190507 |