CN103822211A - Gelatinization sintering treatment method of waste incineration fly ash and waste treatment method - Google Patents
Gelatinization sintering treatment method of waste incineration fly ash and waste treatment method Download PDFInfo
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- CN103822211A CN103822211A CN201410074319.9A CN201410074319A CN103822211A CN 103822211 A CN103822211 A CN 103822211A CN 201410074319 A CN201410074319 A CN 201410074319A CN 103822211 A CN103822211 A CN 103822211A
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Abstract
The invention discloses a gelatinization sintering treatment method of waste incineration fly ash. The gelatinization sintering treatment method of waste incineration fly ash comprises the following steps: S1, performing sintering pretreatment on the waste incineration fly ash so as to form solidified fly ash; S2, conveying the solidified fly ash into an incinerator used for incinerating household wastes, and performing sintering treatment on the solidified fly ash so as to generate accumulated waste incineration fly ash. According to the gelatinization sintering treatment method of waste incineration fly ash, the incinerator used in waste incineration is utilized for sintering, the waste incineration fly ash and the household wastes are conveyed into the incinerator together for combustion, sintering conditions and equipment are not needed to be additionally set, technical problems are not needed to be additionally overcome, the cost is low, the flow path is short, the operation is convenient, and the method is convenient in construction and large-range engineering application; in addition, when the waste incineration fly ash is subjected to a gelatinization sintering process, after heavy metals and dioxin in the waste incineration fly ash are subjected to high-temperature sintering, slags in the incinerator have stable physical properties, cannot pollute environment and can be recycled.
Description
Technical field
The present invention relates to a kind of environmental protection and hazardous waste disposal technical field, particularly a kind of gelling sintering processing method and waste disposal method of incineration of refuse flyash.
Background technology
Along with population increases sharply and growth in the living standard, house refuse becomes the major issue that affects China's environment day by day.Waste incineration because of efficient quick, subtract hold significantly, energy utilization rate advantages of higher becomes one of usual way of domestic rubbish disposal.But, in the incineration of refuse flyash that waste incineration produces, contain plurality of heavy metal and organic pollution, be the hazardous waste (numbering HW18) of " national Hazardous Waste List " regulation, before final processing, must carry out stabilization processes.
Incineration of refuse flyash is the reaction product that dust, flue gas and flue gas purification system that the flue gas that produces in consumer waste incineration processing procedure carries produce, and it is mainly made up of the tiny grit of particle, is light grey.Incineration of refuse flyash mainly comprises CaO, Al
2o
3, SiO
2, Fe
2o
3with the conventional component such as chloride, sulfate, contain heavy metal, dioxin (PCDDs) and furans (PCDFs) pollutant (be called for short “ bioxin "), poisonous and harmful simultaneously.At present, the main method of disposal of refuse flying ash comprises landfill method, pharmaceutical treatment and melting and solidification method.But there is separately problem below in these methods:
One, landfill comprises security landfill and sanitary landfills.The disposal cost of each ton of incineration of refuse flyash of security landfill is 2500 yuan, and cost is high.Sanitary landfills is in incineration of refuse flyash, to add cement and chelating agent to be cured processing, and reaches the sanitary filling field prefecture landfill that transports appointment after standard to.Like this, the recycling rate of incineration of refuse flyash is low and taken a large amount of soils.And incineration of refuse flyash increase-volume after solidifying is larger, bring higher cost and more space requirement to follow-up transportation and processing.In addition, landfill needs a lot of examination and approval procedures, and operating performance, wastes time and energy.
Two, pharmaceutical treatment: the method is in stable curing heavy metal, very micro-to organic effectiveness such as two English; The firming body producing can only be placed in neutral or weakly alkaline environment, otherwise heavy metal stripping contaminated environment again.Due to diversity and the otherness of incineration of refuse flyash, also do not find a kind of medicament that is applicable to various incineration of refuse flyash, therefore large-scale application is restricted; And containing dissolubility salt and suspension heavy metal class, very likely cause secondary pollution in incineration of refuse flyash dehydration after treatment filtrate.
Three, melting and solidification method: the method is innoxious thoroughly, subtract and hold that decrement degree is high, properties of product stable and resourcebility recycling.But the problems such as the method also exists, and processing cost is very high, secondary pollution needs to administer, capital equipment reliability is still to be tested, also do not carry out engineering application at present, cannot promote on a large scale.
Summary of the invention
Main purpose of the present invention has been to provide a kind of gelling sintering processing method and waste disposal method of incineration of refuse flyash, avoiding the cost of prior art high, long flow path, resource utilization be low, and the problem that cannot promote the use of on a large scale.
To achieve these goals, the invention provides a kind of gelling sintering processing method of incineration of refuse flyash, comprise the steps: S1, incineration of refuse flyash is carried out to pretreatment before sintering, solidify flying dust to form; S3, described in solidify in the incinerator that flying dust is transported to burning domestic garbage and carry out sintering processes, and produce the incineration of refuse flyash of accumulation.
Preferably, in described step S1, to adding in described incineration of refuse flyash water and gelling curing agent described incineration of refuse flyash is carried out to pretreatment before sintering.
Preferably, in described step S1, to adding in described incineration of refuse flyash water and gelling curing agent incineration of refuse flyash is carried out to pretreatment before sintering, and the mass ratio of described incineration of refuse flyash, described water and described gelling curing agent is 100:8-16:5-15.
Preferably, after described step S3, also comprise step S4 and step S5, described step S5: when the heavy metal concentration in the incineration of refuse flyash of described accumulation reaches setting, by carrying out landfill disposal after stabilisation pretreatment; Described step S4: the Leaching of Heavy Metals concentration of monitoring the slag of described step S3 generation; In the time that the leaching concentration of all heavy metals of described slag is less than or equal to Extraction Toxicity Identification Standard of Hazardous Waste value, carry out successively described step S1 and described step S3, in the time that the leaching concentration of any one heavy metal of described slag is greater than described Extraction Toxicity Identification Standard of Hazardous Waste value, carry out described step S5.
Preferably, described Extraction Toxicity Identification Standard of Hazardous Waste is GB5085.3.
The present invention also provides a kind of processing method of rubbish, and it comprises step 1: house refuse is burned, obtain incineration of refuse flyash; Also comprise step 2: the gelling sintering processing method by above-mentioned incineration of refuse flyash is processed the incineration of refuse flyash obtaining in described step 1.
Preferably, in described step 1, house refuse produces described incineration of refuse flyash after burning by CIU, and described CIU comprises incinerator, described in solidify flying dust and be transported to and in described incinerator, carry out sintering processes.
Beneficial effect of the present invention:
Incinerator used when the gelling sintering processing method of incineration of refuse flyash of the present invention and waste disposal method utilize waste incineration carries out sintering, only incineration of refuse flyash need to be delivered to together with house refuse to burning in incinerator, without sintering condition and equipment are set separately, and without overcoming separately technical barrier, cost is low, easy to operate, be convenient to implement and engineering application on a large scale.In addition, incineration of refuse flyash is in the process of sintering, and the heavy metal in incineration of refuse flyash and bioxin are after high temperature incineration, and sintering slag physical stability is fixed, does not pollute the environment, and has realized the innoxious of incineration of refuse flyash and reduction process process.And incineration of refuse flyash is converted to recycling slag, and resource utilization is high.
Accompanying drawing explanation
Fig. 1 is the structural representation of the gelling sintering processing method of incineration of refuse flyash of the present invention;
Fig. 2 is the concrete structure schematic diagram of the gelling sintering processing method of incineration of refuse flyash of the present invention.
The specific embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Please refer to Fig. 1, the gelling sintering processing method of the incineration of refuse flyash that the embodiment of the present invention provides, it comprises the steps:
S1, carries out pretreatment before sintering to incineration of refuse flyash.
Incineration of refuse flyash burns generation by house refuse by refuse burning system, and it comprises flying dust and reaction product.Refuse burning system comprises the incinerator, waste heat boiler, smoke eliminator and the Bag filter device that connect successively.Incinerator comprises the fire grate for house refuse is burned and is arranged at the burner hearth on fire grate top.House refuse is burned and is produced slag, flue gas and flying dust in incinerator; Wherein, slag is discharged by fire grate end, and can be used for manufacturing blast furnace cement, cinder brick and clinker glass etc.; The heat that flue gas and flying dust are collected by waste heat boiler can be used for generating or heat supply, and afterwards, flue gas is processed rear formation purifying smoke by smoke eliminator and Bag filter device successively, and discharges by chimney.Together with flying dust, flue gas and the flying dust reaction product in purifier and Bag filter device, form the above-mentioned incineration of refuse flyash with harmfulness.
Before the sintering of incineration of refuse flyash, when pretreatment, in incineration of refuse flyash, add water and gelling curing agent, and mix to form flying dust compound.Flying dust compound forms and solidifies flying dust after leaving standstill maintenance or extrusion modling, thereby incineration of refuse flyash is solid-state by becoming of grey shape, has avoided incineration of refuse flyash to blow floating aloft.It should be noted that, solidifying flying dust can be solid granulates, knot or the forms such as slag of condensing, and swims in aerial as long as satisfied can not flying upward.Preferably, under flying dust compound normal temperature and pressure, place and within 2-3 days, form afterwards the solid-state flying dust that solidifies.The mass ratio of incineration of refuse flyash, water and gelling curing agent is 100:8-16:5-15.And in existing technology, the mass ratio of incineration of refuse flyash, water and curing agent is 100:15-25:20-30, also to add the chelating agent that mass percent is 0.5-5%.From the above: before the sintering of incineration of refuse flyash, when pretreatment, only need the less gelling curing agent of adding proportion and water, and without adding chelating agent, reduced the increase-volume ratio after solidifying, and reduced cost.
S3, carries out sintering processes to the above-mentioned flying dust that solidifies.
Particularly, solidify in the incinerator that flying dust is transported to refuse burning system together with house refuse and burn, and newly-increased house refuse and solidify flying dust and burn together and also can produce incineration of refuse flyash in S3.For the ease of with S1 in incineration of refuse flyash difference, hereinafter by house refuse newly-increased in S3 and solidify the incineration of refuse flyash that incineration of refuse flyash that flying dust produces is together called accumulation.Because incineration of refuse flyash entered before the sintering of S1 after pretreatment, can not kick up to be suspended in burner hearth, but because the effect of gravity is placed on fire grate, be layer combustion thereby make the sintering process of incineration of refuse flyash on fire grate, be heated evenly and flameholding.And solidify flying dust and be only limited in incineration plant inside and carry out short-range transportation, and the sintering processes of utilizing the incinerator of ready-made refuse burning system to solidify flying dust, formed cycling on the spot, convenient and saved labour cost and installation cost.The heavy metal and the bioxin etc. that solidify in flying dust pollute after the burning of 600-1200 ℃, part volatilization degraded, and part is cemented in inorganic salts lattice, and after sintering, slag physical property is stable, does not pollute the environment.Solidify flying dust and be converted into slag, can be used as construction material, roadbed material and cement material etc., improved the recycling rate of incineration of refuse flyash and reduced landfill land used.It should be noted that, refuse burning system in incineration plant, may be provided with multiple incinerators, like this, solidify flying dust and can be transported in any one nearer incinerator and carry out sintering processes, without being transported to sintering in the incinerator that generates this incineration of refuse flyash.
Particularly, in the present embodiment, after step S3, be also provided with step S5, step S5: when the incineration of refuse flyash of accumulation reaches setting, carry out carrying out again landfill disposal after stabilisation pretreatment.
When the processing of cycle sintering on the spot through one or many step S3, when the incineration of refuse flyash of accumulation reaches the heavy metal concentration enrichment limit value of regulation, in the incineration of refuse flyash of accumulation, add water, chelating agent and gelling curing agent to carry out stabilisation pretreatment, carry out again afterwards sanitary landfills or security landfill.Through carrying out again step S5 processing after step S3, compared with traditional simple burying method, improve the recycling rate of incineration of refuse flyash, reduce landfill frequency and amount of landfill, and saved landfill land used.
As preferred embodiment, incorporated by reference to reference to Fig. 2, in the present embodiment, the gelling sintering processing method of incineration of refuse flyash of the present invention also comprises step S4 after step S3.Particularly, step S4 is the Leaching of Heavy Metals concentration of monitoring in time the slag of S3 generation.In the time that the contained Leaching of Heavy Metals concentration of the slag producing in S3 is less than or equal to Extraction Toxicity Identification Standard of Hazardous Waste value, carry out successively step S1 and step S3; In the time that any one contained Leaching of Heavy Metals concentration of the slag producing in S3 is greater than Extraction Toxicity Identification Standard of Hazardous Waste value, carry out step S5.Like this, by newly-increased step S4, be conducive to the Leaching of Heavy Metals concentration in slag that each sintering of timely detecting step S3 produces period, and judge thus the heavy metal accumulation degree in the incineration of refuse flyash of the accumulation through producing after step S3, while having avoided Leaching of Heavy Metals concentration in the incineration of refuse flyash of accumulation too high, recirculation step S3 pollutes the problem of slag.It should be noted that, in the present embodiment, above-mentioned Extraction Toxicity Identification Standard of Hazardous Waste is GB5085.3; Certainly in other embodiments, above-mentioned hazardous waste judging standard is not limited to GB5085.3, as long as meet the emission limit of national regulation.
From above-mentioned narration, incinerator used when the gelling sintering processing method of incineration of refuse flyash of the present invention utilizes waste incineration carries out sintering, only incineration of refuse flyash need to be delivered to together with house refuse to burning in incinerator, without sintering condition and special agglomerating plant are set separately, and without overcoming separately technical barrier, provide cost savings, easy to operate, be convenient to implement and engineering application on a large scale.In addition, incineration of refuse flyash is in the process of sintering, and the heavy metal in incineration of refuse flyash and bioxin are after high temperature incineration, and sintering slag physical stability is fixed, does not pollute the environment, and has realized the innoxious of incineration of refuse flyash and reduction process process.And incineration of refuse flyash is converted to recycling slag, and resource utilization is high.
The present invention also provides a kind of waste disposal method, and it comprises the gelling sintering processing method of above-mentioned incineration of refuse flyash.Particularly, this kind of waste disposal method is: step 1, house refuse is burned, and obtain incineration of refuse flyash; Step 2, burns the incineration of refuse flyash producing and processes according to the gelling sintering processing method of above-mentioned incineration of refuse flyash.It should be noted that, in the time that above-mentioned waste disposal method comprises the gelling sintering processing method of above-mentioned incineration of refuse flyash, certainly also can reach the beneficial effect of the gelling sintering processing method of above-mentioned incineration of refuse flyash.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. a gelling sintering processing method for incineration of refuse flyash, is characterized in that, comprises the steps:
S1, carries out pretreatment before sintering to incineration of refuse flyash, solidifies flying dust to form;
S3, described in solidify in the incinerator that flying dust is transported to burning domestic garbage and carry out sintering processes, and produce the incineration of refuse flyash of accumulation.
2. the gelling sintering processing method of incineration of refuse flyash according to claim 1, is characterized in that, in described step S1, to adding in described incineration of refuse flyash water and gelling curing agent described incineration of refuse flyash is carried out to pretreatment before sintering.
3. the gelling sintering processing method of incineration of refuse flyash according to claim 1, it is characterized in that, in described step S1, to adding in described incineration of refuse flyash water and gelling curing agent incineration of refuse flyash is carried out to pretreatment before sintering, and the mass ratio of described incineration of refuse flyash, described water and described gelling curing agent is 100:8-16:5-15.
4. the gelling sintering processing method of incineration of refuse flyash according to claim 1, it is characterized in that, after described step S3, also comprise step S4 and step S5, described step S5: when the heavy metal concentration in the incineration of refuse flyash of described accumulation reaches setting, by carrying out landfill disposal after stabilisation pretreatment; Described step S4: the Leaching of Heavy Metals concentration of monitoring the slag of described step S3 generation; In the time that the leaching concentration of all heavy metals of described slag is less than or equal to Extraction Toxicity Identification Standard of Hazardous Waste value, carry out successively described step S1 and described step S3, in the time that the leaching concentration of any one heavy metal of described slag is greater than described Extraction Toxicity Identification Standard of Hazardous Waste value, carry out described step S5.
5. the gelling sintering processing method of incineration of refuse flyash according to claim 4, is characterized in that, described Extraction Toxicity Identification Standard of Hazardous Waste is GB5085.3.
6. a waste disposal method, it comprises step 1: house refuse is burned, obtain incineration of refuse flyash; It is characterized in that, also comprise step 2: the gelling sintering processing method by the incineration of refuse flyash described in any one in the claims 1 to 5 is processed the incineration of refuse flyash obtaining in described step 1.
7. waste disposal method according to claim 6, it is characterized in that, in described step 1, house refuse produces described incineration of refuse flyash after burning by CIU, described CIU comprises incinerator, described in solidify flying dust and be transported to and in described incinerator, carry out sintering processes.
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Cited By (3)
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| CN107904405A (en) * | 2017-11-24 | 2018-04-13 | 台州学院 | The method and apparatus of metal dissolving in a kind of reduction domestic waste incineration residue |
| CN108151026A (en) * | 2018-01-09 | 2018-06-12 | 修武永乐新能源环保设备有限公司 | A kind of processing unit and technique of HW18 incineration disposals residue |
| CN110631021A (en) * | 2018-06-22 | 2019-12-31 | 汤广武 | Safe treatment method of fly ash |
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| CN103822211B (en) | 2016-09-28 |
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