CN104324931A - Solidifying/stabilizing treatment method for waste incineration fly ash - Google Patents
Solidifying/stabilizing treatment method for waste incineration fly ash Download PDFInfo
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Abstract
The invention discloses a solidifying/stabilizing treatment method for waste incineration fly ash. The solidifying/stabilizing treatment method comprises three steps of waste incineration fly ash pretreatment, waste incineration fly ash stabilization and waste incineration fly ash solidification. Waste incineration fly ash pretreatment is carried out through microwave and centrifugation, so that the content of chloride ions and heavy metal ions in fly ash can be effectively lowered, and environment risk cased by fly ash is reduced; and Pb, Cd, Zn and Cu ions can be effectively stabilized by sodium sulfide, Cr, Ni, Pb and Zn ions can be effectively adsorbed by bio-char, and sodium sulfide and bio-char are collaboratively used in the stabilizing treatment process, so that the stabilizing treatment effect can be significantly improved. Lime can generate gelation action when stabilizing heavy metal in fly ash, so that processed fly ash is endowed with certain strength. Fly ash can be economically and efficiently processed, resource utilization of wastes is achieved, the target of treating wastes by using wastes is achieved, and the solidifying/stabilizing treatment method is low in treatment cost, low in environment risk and easy to popularize on a large scale and achieves a good treatment effect,.
Description
Technical field
The invention discloses incineration of refuse flyash solidification/stabilization treatment method, belong to field of environment engineering technology.
Background technology
Since 2009, China has recurred more than 30 particularly serious heavy metal pollution event." heavy metal pollution integrated control " 12 " planning " explicitly calls for, and by 2015, the discharge of the heavy metal contaminants such as key area lead, mercury, chromium, cadmium and metalloid arsenic, cut down 15% than 2007.At present, China, by nearly 20,000,000 hectares of the cultivated area of the heavy metal pollutions such as cadmium, arsenic, chromium, lead, accounts for 1/5 of total cultivated area, and the whole nation is more than 1,000 ten thousand tons, the underproduction grain because of heavy metal pollution every year, and direct economic loss is more than 20,000,000,000 yuan.In heavy metal improvement, environmental administration requires progressively to improve to the discharge of wastewater of the industries such as chemical industry, metallurgy and plating, and the higher incineration of refuse flyash of heavy metal accumulation amount is not dealt carefully with for a long time, the heal incineration of refuse flyash of 1,000,000 tons of annual production progressively becomes heavy metal pollution principal element after industrial discharge.Therefore, incineration of refuse flyash safe disposal has become the bottleneck that national Heavy Metal Pollution strategic objective is implemented to solve.
At present, processing method for incineration of refuse flyash mainly contains following several: (1) cement solidification method: cement solidification method adds according to a certain percentage by cement and flying dust, advantage be process after mixture possess certain intensity, technology is simple, but reach certain intensity and lower Leaching, the addition of cement is higher; (2) melt process method: melt process method forms slag by flying dust residue high-temperature heating after 1200-1500 DEG C of melting, the vitreum stability that this facture possesses formation is high, heavy metal not easily stripping and slag can the advantage such as secondary utilization, but higher operating cost limits the application of this method; (3) stabilizing fly ash facture: use stabilizing agent to carry out stabilization processes to flying dust and possess the advantages such as simple to operate, equipment investment is few and final processing capacity is few, but the inorganic salts waste water of high concentration can be produced, need to carry out after-treatment, refuse intensity simultaneously after process is too low, and long-range circumstances risk is higher.
In recent years, the quickening of building along with China's municipal sewage treatment dynamics and sewage treatment facility, treatment rate of domestic sewage improves constantly, and sludge yield significantly increases.By in by the end of March, 2013, national the planned city, county add up to build up urban wastewater treatment firm 3451, sewage treatment capacity about 1.45 billion cubic meters/day, produce more than 3,500 ten thousand tons, the mud of water content 80% year.According to finding display, the mud that wastewater treatment in China factory produces, has major part not dealt carefully with, and mud is arbitrarily stacked and the secondary pollution problem that causes highlights, and causes the concern of society.
Summary of the invention
For above-mentioned existing problems, the object of the present invention is to provide incineration of refuse flyash solidification/stabilization treatment method, before flyash curing/stabilization processes by microwave, centrifugally carry out pretreatment, biological carbon stabilizing heavy metal prepared by municipal sludge is adopted during stabilization processes, the method treatment effect is good, and resource utilization rate is high, the advantage that environmental risk is low, for achieving the above object, its technical solution is:
Incineration of refuse flyash solidification/stabilization treatment method, described method is carried out according to following steps:
A) incineration of refuse flyash pretreatment
Flying dust and water are formed mortar in 3 minutes according to mass ratio 1: 10 mix and blend, microwave treatment 8 minutes, microwave power is 800-1000W, to be added by the mortar after microwave treatment in centrifuge with the centrifugation 10 minutes of 3000 revs/min, collect centrifugal after waste water and lime-ash in centrifuge;
B) stabilisation of incineration of refuse flyash
Again vulcanized sodium taken according to the 2-4% of flying dust quality and be dissolved in 20kg water, stir and form sodium sulfide solution, again sodium sulfide solution is added through steps A) in the lime-ash collected, add biological carbon according to the 3-5% of flying dust quality simultaneously, stir 10 minutes, leave standstill 10 minutes and formed and stablize mortar;
C) solidification of incineration of refuse flyash
According to the 15-20% of flying dust quality to through B) add lime in the stable mortar that formed of step, then add 40kg water, strong stirring 5-10 minute, leave standstill.
Described water is the one in running water or river;
Described biological carbon is the porous carbon of high temperature pyrolysis under municipal sludge 500 DEG C of anoxia conditions, and biological carbon particle diameter is less than 50 orders.
Incineration of refuse flyash solidification/stabilization treatment method disclosed by the invention, comprises incineration of refuse flyash pretreatment, incineration of refuse flyash stabilisation and incineration of refuse flyash and solidifies three steps.Microwave treatment can chlorion efficiently in desorption flying dust, and microwave can accelerate the dissolving of toxic heavy metal Zn, Pb, Cu, Cr in flying dust simultaneously, improves the removal efficiency of drip washing effect and heavy metal.By microwave and centrifugally carry out incineration of refuse flyash pretreatment, can effectively remove in flying dust the chlorion affecting curing/stabilizing effect, strengthen post-processed effect.Vulcanized sodium can effectively stable Pb, Cd, Zn and Cu ion, and biological carbon can effectively adsorb Cr, Pb, Ni ion, and stabilization processes process uses vulcanized sodium to work in coordination with biological carbon and uses, and can significantly improve stabilization processes effect.Lime in stable flying dust while heavy metal, can produce gelatification, makes the flying dust after process obtain some strength.The present invention can not only process flying dust in economical and efficient ground, achieves the recycling of discarded object, reaches the object of the treatment of wastes with processes of wastes against one another.And processing cost is low, treatment effect is good, and environmental risk is low, is easy to large-scale promotion.
Detailed description of the invention
Incineration of refuse flyash solidification/stabilization treatment method, described incineration of refuse flyash curing/stabilizing process is carried out according to following steps:
A) incineration of refuse flyash pretreatment
Within 3 minutes, form mortar according to the stirring that adds water of the mass ratio 1: 10 of flying dust and water, add water according to flying dust and water 1: 10 and stir, the abundant stripping of solable matter in flying dust can be ensured.Use microwave treatment 8 minutes, microwave power is 800-1000W, to be added by the mortar after microwave treatment in centrifuge with the centrifugation ten minutes of 3000 revs/min, collect centrifugal after waste water and lime-ash in centrifuge.Before the process of incineration of refuse flyash curing/stabilizing, carry out pretreatment, greatly can reduce the environmental risk of flying dust, improve the treatment effect of curing/stabilizing.Drip washing is carried out by adding water in flying dust, part heavy metal in flying dust and Cl, S plasma can be washed out from flying dust, the drip washing effect of flying dust is strengthened by microwave, the dissolving of toxic heavy metal Zn, Pb, Cu, Cr in flying dust can not only be accelerated in a short time, the desorption effect of Cl, S plasma on fly ash granule can be strengthened simultaneously.After microwave treatment, mortar is carried out centrifugal, collect lime-ash respectively after centrifugal treating and waste water processes respectively.This kind of processing method not only reduces processing cost, and greatly strengthen treatment effect, reduces the environmental risk of flying dust.
B) stabilisation of incineration of refuse flyash
Again vulcanized sodium taken according to the 2-4% of flying dust quality and be dissolved in 20kg water, stir and form sodium sulfide solution, again sodium sulfide solution is added through steps A) in the lime-ash collected, add biological carbon according to the 3-5% of flying dust quality simultaneously, stir 10 minutes, leave standstill 10 minutes and formed and stablize mortar.Vulcanized sodium can effectively stable Pb, Cd, Zn and Cu ion, biological carbon can effectively adsorb Cr, Pb, Ni ion, stabilization processes process uses vulcanized sodium and biological carbon to work in coordination with and uses, and can significantly improve stabilization processes effect, reduce the leaching risk of heavy metal in flying dust.
C) solidification of incineration of refuse flyash
According to the 15-20% of flying dust quality to through B) add lime in the stable mortar that formed of step, then add 40kg water, strong stirring 5-10 minute, leave standstill.Lime is used to solidify the curing agent of process flying dust the most, the heavy metal in flying dust can not only be stablized on the one hand, reduce the Leaching of flyash curing Post RDBMS body, there is gelatification simultaneously, make flyash curing body produce certain intensity, increase the durability of firming body.
Described water is the one in running water or river, running water and river cost simple and easy to get low, be conducive to engineer applied.
Described biological carbon is the porous carbon of high temperature pyrolysis under municipal sludge 500 DEG C of anoxia conditions, and biological carbon particle diameter is less than 50 orders.Biological carbon is that 50 mesh sieve gained screenings pulverized by the porous carbon of high temperature pyrolysis, 500 DEG C of pyrolysis municipal sludges are selected to be because lower temperature can make organic carbonization in municipal sludge incomplete, and the too high meeting of temperature causes the productive rate of biological carbon to reduce, reduce the adsorption effect of biological carbon simultaneously.Being crushed to particle diameter, to be less than 50 orders are specific areas in order to increase biological carbon, thus strengthen the adsorption capacity of biological carbon heavy metal.
Be described in further detail below in conjunction with concrete case study on implementation:
Case study on implementation 1
Take incineration of refuse flyash 100kg, add running water 1000kg and stir 3 minutes formation mortar, use microwave treatment 8 minutes, microwave power is 800W, mortar after microwave treatment to be added in centrifuge with the centrifugation 10 minutes of 3000 revs/min, collect centrifugal after waste water and lime-ash in centrifuge.2kg vulcanized sodium is dissolved in 20kg running water also to stir and forms solution, sodium sulfide solution is added in lime-ash, add 3kg biological carbon simultaneously, stir 10 minutes, leave standstill 10 minutes.In stable mortar, add 15kg lime and 40kg running water, strong stirring 5 minutes, leave standstill.
Case study on implementation 2
Take incineration of refuse flyash 100kg, add river 1000kg and stir 3 minutes formation mortar, use microwave treatment 8 minutes, microwave power is 900W, mortar after microwave treatment to be added in centrifuge with the centrifugation 10 minutes of 3000 revs/min, collect centrifugal after waste water and lime-ash in centrifuge.2kg vulcanized sodium is dissolved in 20kg river also to stir and forms solution, sodium sulfide solution is added in lime-ash, add 3kg biological carbon simultaneously, stir 10 minutes, leave standstill 10 minutes.In stable mortar, add 15kg lime and 40kg river, strong stirring 5 minutes, leave standstill.
Case study on implementation 3
Take incineration of refuse flyash 100kg, add running water 1000kg and stir 3 minutes formation mortar, use microwave treatment 8 minutes, microwave power is 1000W, mortar after microwave treatment to be added in centrifuge with the centrifugation ten minutes of 3000 revs/min, collect centrifugal after waste water and lime-ash in centrifuge.2kg vulcanized sodium is dissolved in 20kg running water also to stir and forms solution, sodium sulfide solution is added in lime-ash, add 3kg biological carbon simultaneously, stir 10 minutes, leave standstill 10 minutes.In stable mortar, add 15kg lime and 40kg running water, strong stirring 5 minutes, leave standstill.
Case study on implementation 4
Take incineration of refuse flyash 100kg, add river 1000kg and stir 3 minutes formation mortar, use microwave treatment 8 minutes, microwave power is 800W, mortar after microwave treatment to be added in centrifuge with the centrifugation 10 minutes of 3000 revs/min, collect centrifugal after waste water and lime-ash in centrifuge.3kg vulcanized sodium is dissolved in 20kg river also to stir and forms solution, sodium sulfide solution is added in lime-ash, add 4kg biological carbon simultaneously, stir 10 minutes, leave standstill 10 minutes.In stable mortar, add 18kg lime and 40kg river, strong stirring 8 minutes, leave standstill.
Case study on implementation 5
Take incineration of refuse flyash 100kg, add running water 1000kg and stir 3 minutes formation mortar, use microwave treatment 8 minutes, microwave power is 900W, mortar after microwave treatment to be added in centrifuge with the centrifugation 10 minutes of 3000 revs/min, collect centrifugal after waste water and lime-ash in centrifuge.3kg vulcanized sodium is dissolved in 20kg running water also to stir and forms solution, sodium sulfide solution is added in lime-ash, add 4kg biological carbon simultaneously, stir 10 minutes, leave standstill 10 minutes.In stable mortar, add 18kg lime and 40kg running water, strong stirring 8 minutes, leave standstill.
Case study on implementation 6
Take incineration of refuse flyash 100kg, add river 1000kg and stir 3 minutes formation mortar, use microwave treatment 8 minutes, microwave power is 1000W, mortar after microwave treatment to be added in centrifuge with the centrifugation 10 minutes of 3000 revs/min, collect centrifugal after waste water and lime-ash in centrifuge.3kg vulcanized sodium is dissolved in 20kg river also to stir and forms solution, sodium sulfide solution is added in lime-ash, add 4kg biological carbon simultaneously, stir 10 minutes, leave standstill 10 minutes.In stable mortar, add 18kg lime and 40kg river, strong stirring 8 minutes, leave standstill.
Case study on implementation 7
Take incineration of refuse flyash 100kg, add running water 1000kg and stir 3 minutes formation mortar, use microwave treatment 8 minutes, microwave power is 800W, mortar after microwave treatment to be added in centrifuge with the centrifugation 10 minutes of 3000 revs/min, collect centrifugal after waste water and lime-ash in centrifuge.4kg vulcanized sodium is dissolved in 20kg running water also to stir and forms solution, sodium sulfide solution is added in lime-ash, add 5kg biological carbon simultaneously, stir 10 minutes, leave standstill 10 minutes.In stable mortar, add 20kg lime and 40kg running water, strong stirring 10 minutes, leave standstill.
Case study on implementation 8
Take incineration of refuse flyash 100kg, add river 1000kg and stir 3 minutes formation mortar, use microwave treatment 8 minutes, microwave power is 900W, mortar after microwave treatment to be added in centrifuge with the centrifugation 10 minutes of 3000 revs/min, collect centrifugal after waste water and lime-ash in centrifuge.4kg vulcanized sodium is dissolved in 20kg river also to stir and forms solution, sodium sulfide solution is added in lime-ash, add 5kg biological carbon simultaneously, stir 10 minutes, leave standstill 10 minutes.In stable mortar, add 20kg lime and 40kg river, strong stirring 10 minutes, leave standstill.
Case study on implementation 9
Take incineration of refuse flyash 100kg, add running water 1000kg and stir 3 minutes formation mortar, use microwave treatment 8 minutes, microwave power is 1000W, mortar after microwave treatment to be added in centrifuge with the centrifugation 10 minutes of 3000 revs/min, collect centrifugal after waste water and lime-ash in centrifuge.4kg vulcanized sodium is dissolved in 20kg running water also to stir and forms solution, sodium sulfide solution is added in lime-ash, add 5kg biological carbon simultaneously, stir 10 minutes, leave standstill 10 minutes.In stable mortar, add 20kg lime and 40kg running water, strong stirring 10 minutes, leave standstill.
Claims (3)
1. incineration of refuse flyash solidification/stabilization treatment method, is characterized in that: described incineration of refuse flyash solidification/stabilization treatment method carries out according to following steps:
A) incineration of refuse flyash pretreatment
Flying dust and water are formed mortar in 3 minutes according to mass ratio 1: 10 mix and blend, microwave treatment 8 minutes, microwave power is 800-1000W, to be added by the mortar after microwave treatment in centrifuge with the centrifugation 10 minutes of 3000 revs/min, collect centrifugal after waste water and lime-ash in centrifuge;
B) stabilisation of incineration of refuse flyash
Again vulcanized sodium taken according to the 2-4% of flying dust quality and be dissolved in 20kg water, stir and form sodium sulfide solution, again sodium sulfide solution is added through steps A) in the lime-ash collected, add biological carbon according to the 3-5% of flying dust quality simultaneously, stir 10 minutes, leave standstill 10 minutes and formed and stablize mortar;
C) solidification of incineration of refuse flyash
According to the 15-20% of flying dust quality to through B) add lime in the stable mortar that formed of step, then add 40kg water, strong stirring 5-10 minute, leave standstill.
2. incineration of refuse flyash solidification/stabilization treatment method as claimed in claim 1, is characterized in that: described water is the one in running water or river;
3. incineration of refuse flyash solidification/stabilization treatment method as claimed in claim 1, is characterized in that: described biological carbon is the porous carbon of high temperature pyrolysis under municipal sludge 500 DEG C of anoxia conditions, and biological carbon particle diameter is less than 50 orders.
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Cited By (7)
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| CN105478447A (en) * | 2015-12-30 | 2016-04-13 | 西南科技大学 | Treatment method for incineration fly ash of household rubbish |
| CN105562423A (en) * | 2016-01-04 | 2016-05-11 | 中国科学院武汉岩土力学研究所 | Melting treatment method for waste incineration flying ash |
| CN108314366A (en) * | 2018-03-14 | 2018-07-24 | 清华大学 | A method of utilizing domestic garbage incineration flyash and furnace slag brick making |
| CN108380640A (en) * | 2018-02-12 | 2018-08-10 | 江苏天楹环保能源成套设备有限公司 | A kind of method of vacuum microwave carbon thermal reduction processing flying dust |
| CN110465538A (en) * | 2019-08-19 | 2019-11-19 | 中南大学 | A kind of pre- dechlorination-sintering processes technique of high chlorine metallurgy waste material and flying ash |
| CN112642838A (en) * | 2020-12-17 | 2021-04-13 | 西南科技大学 | High-quality utilization method of waste incineration fly ash |
| CN114712767A (en) * | 2022-04-24 | 2022-07-08 | 长江水利委员会长江科学院 | Method for fixing chlorine and stabilizing heavy metal in fly ash |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105478447A (en) * | 2015-12-30 | 2016-04-13 | 西南科技大学 | Treatment method for incineration fly ash of household rubbish |
| CN105562423A (en) * | 2016-01-04 | 2016-05-11 | 中国科学院武汉岩土力学研究所 | Melting treatment method for waste incineration flying ash |
| CN105562423B (en) * | 2016-01-04 | 2018-03-13 | 中国科学院武汉岩土力学研究所 | A kind of incineration of refuse flyash melting process for the treatment of |
| CN108380640A (en) * | 2018-02-12 | 2018-08-10 | 江苏天楹环保能源成套设备有限公司 | A kind of method of vacuum microwave carbon thermal reduction processing flying dust |
| 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 |
| CN108314366A (en) * | 2018-03-14 | 2018-07-24 | 清华大学 | A method of utilizing domestic garbage incineration flyash and furnace slag brick making |
| CN108314366B (en) * | 2018-03-14 | 2019-09-27 | 清华大学 | A method of utilizing domestic garbage incineration flyash and furnace slag brick making |
| CN110465538A (en) * | 2019-08-19 | 2019-11-19 | 中南大学 | A kind of pre- dechlorination-sintering processes technique of high chlorine metallurgy waste material and flying ash |
| CN112642838A (en) * | 2020-12-17 | 2021-04-13 | 西南科技大学 | High-quality utilization method of waste incineration fly ash |
| CN112642838B (en) * | 2020-12-17 | 2022-03-29 | 西南科技大学 | High-quality utilization method of waste incineration fly ash |
| CN114712767A (en) * | 2022-04-24 | 2022-07-08 | 长江水利委员会长江科学院 | Method for fixing chlorine and stabilizing heavy metal in fly ash |
| CN114712767B (en) * | 2022-04-24 | 2023-02-14 | 长江水利委员会长江科学院 | Method for fixing chlorine and stabilizing heavy metal in fly ash |
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