CN101569890A - New disposal method of fly ash - Google Patents
New disposal method of fly ash Download PDFInfo
- Publication number
- CN101569890A CN101569890A CNA2009100850965A CN200910085096A CN101569890A CN 101569890 A CN101569890 A CN 101569890A CN A2009100850965 A CNA2009100850965 A CN A2009100850965A CN 200910085096 A CN200910085096 A CN 200910085096A CN 101569890 A CN101569890 A CN 101569890A
- Authority
- CN
- China
- Prior art keywords
- flying dust
- kiln
- fly ash
- cement
- kiln hood
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention relates to a new disposal method of fly ash, including the following technical process: a tank truck after pulling in a factory drives the fly ash into an ash storage bin by vacuum pressure carried by the tank; a gauging device in the ash storage bin controls the discharge amount of the fly ash, and then the fly ash goes into a pneumatic transportation bin; the fly ash of the pneumatic transportation bin is transported to a combustor or a spray gun of kiln hood by pneumatic power and then is sprayed into a rotary kiln for incineration by the combustor or the spray gun; heavy metal in the fly ash is solidified into the composition of cement and can not be separated out; and poisonous and pernicious dioxin contained in the fly ash is completely broken down into water and carbon oxide and the like at high temperature in the kiln. The invention has the advantages that: spraying point is arranged at the kiln hood, thus effectively realizing innocent treatment of the poisonous and pernicious dioxin in the fly ash; the heavy metal is solidified by the cement, can not be separated out and finally is contained in the cement product, thus realizing waste utilization without secondary pollution; the technique is novel, unique, simple and practical; the process is continuous, automatic, safe and reliable.
Description
Technical field
The present invention relates to the processing method of flying dust, be specifically related to a kind of new processing method of flying dust.
Background technology
The content of beary metal kind is many, ratio is high and contain a large amount of chlorions because the flying dust that produces after the waste incineration has, and also contains characteristics such as the harmful De bioxin of severe toxicity, and common method of disposal can't reach harmlessness disposing.Waste incineration is advanced both at home and abroad at present waste reduction technology.Waste incineration is in burning process, and the burning residue of being collected by flue gas purification system is called incineration of refuse flyash.Owing to contain organic pollution such as BaP, Ben Bing Onion, bioxin and Cr, Cd, Hg, Pb, heavy metals such as Cu, Ni in the flying dust, belong to dangerous solid waste, therefore directly landfill can polluted underground water.Build special-purpose landfill yard cost height, and a large amount of land occupation resource, unfavorable to the sustainable development in city.
The disposal of incineration of refuse flyash now mainly contains following two kinds of technology:
1) landfill technology
At present, the disposal utilization of incineration of refuse flyash is also enough paid attention to, and almost all takes landfill.But landfill is with high costs, and the present landfill in Shanghai City is disposed the cost of incineration of refuse flyash up to more than 2400 yuan/ton.More seriously also will bring many environment hidden danger after the landfill disposal, as the secondary pollution of heavy metal.The heavy metal substance major part that evaporating point is lower than incineration temperature during waste incineration can be evaporated and enter flue gas, with the reduction of flue-gas temperature condense into uniform granule and condense with flue gas in flue dust on, incoagulable gaseous state heavy metal substance also has part can be attracted on the flue dust, is captured by smoke dust-removing equipment at last.If the incineration of refuse flyash landfill that contains heavy metal is in underground, polluted-water and soil easily.The Qie bioxin has irreversible " three cause " toxicity, i.e. teratogenesis, carcinogenic, mutagenesis.Can cause the generation of multiple disease.Bioxin is again a class persistence organic pollutant, and lasting the existence and constantly enrichment in environment, in case the absorption organism just is difficult to decompose or discharge, meeting is constantly transmitted with food chain and accumulation is amplified, and finally can work the mischief to human body.
This shows that the landfill disposal of incineration of refuse flyash will be brought serious secondary pollution to environment.
2) curing technology
At present both at home and abroad the curing mode of disposal of refuse flying ash mainly contains melting and solidification, bitumen solidification, plastic material solidifies, solidifies etc. from glued, and these several curing are because technology and economic cause seldom are applied to the processing of incineration of refuse flyash.
Summary of the invention
Purpose of the present invention mainly is the reluctant problem of flying dust after the solution waste incineration, provides a kind of new processing method of flying dust, the method that promptly adopts high temperature incineration and cement solidification to combine.The present invention adopts innovative thinking, with the flying dust process lab analysis that produces after the waste incineration, determine that regulating it according to the demand of manufacture of cement after it is formed advances the kiln amount, thereby realize that flying dust is disposed and the balance of manufacture of cement, utilize the high temperature characteristics of cement kiln that De bioxin in the flying dust is thoroughly decomposed, heavy metal is cured to a part that becomes cement in the cement lattice, reaches the purpose of the harmless treatment of flying dust.
The objective of the invention is to realize by following technical scheme.Its technological process may further comprise the steps:
(1) after the automotive tank car that loads flying dust enters factory,, through the pipeline that puts in storage flying dust is squeezed in the ash-storing bin and to be deposited by self-contained vacuum pressure;
(2) flying dust of ash-storing bin is by metering device metering and blanking, and the blanking amount is according to the difference of the chlorinity of flying dust, be controlled at the 200-1000 kilogram/hour, enter strength then and carry the storehouse;
(3) the strength flying dust of carrying the storehouse is transported to the flying dust jetting device of kiln hood by strength along conveyance conduit immediately, is injected in the rotary kiln (high temperature furnace) by the flying dust jetting device and burns;
(4) heavy metal element in the flying dust, in being added into kiln system after, with after cement raw material carries out complex physico-chemical, heavy metal is cured in the cement, as the part of cement, and can not separate out;
(5) the harmful De bioxin of the severe toxicity that contains in the flying dust in kiln more than 1000 ℃ under the high temperature, can thoroughly resolve into materials such as the water of environmental sound and carbon dioxide, has solved flying dust Zhong bioxin and has been difficult to disposal concerns.
The chlorine element also is an one of the chief elements in the flying dust, it is bigger to the influence of kiln system, when the content of Cl element in the kiln is higher, can causes the enrichment circulation of chlorine in the kiln system and form skinning in whole kiln system, so not only cause the decline of grog output, also cause the disorder of whole kiln system; The raw material that can be used as grog when the chlorine element is an amount of participate in reaction.Country must not surpass 0.06% standard to the restriction of the chlorinity in the cement, and we must carry out strictness control to the addition content of flying ash, can not influence the ordinary production of kiln, can be up to state standards again.
Metering device can adopt weigher to control the blanking amount of flying dust among the present invention, grasps the disposal amount of regulating flying dust by the kiln condition in the practical operation, guarantees that the flying dust disposal can not make manufacture of cement be interfered.When rotary kiln ran well, the kiln hood gas temperature was stabilized in about 1000-1750 ℃, and main chemical reactions is:
Inorganic matter (calcareous, siliceous, irony, aluminium matter) → dicalcium silicate (2CaOSiO
2)+tricalcium silicate (3CaOSiO
2)+tricalcium aluminate (3CaOAl
2O
3)+tetra calcium aluminoferrite (4CaOAl
2O
3Fe
2O
3)
Organic matter 2CxHyOz+ (2x+y/2-z) O
2→ 2xCO
2+ yH
2The O+ heat
(annotate: iron, calcium, aluminium, silicon are the element that constitutes cement, at high temperature participate in the reaction that clinker forms, and finally enter cement products.)
The key point that the cement kiln flying dust is disposed is that also flying dust sprays into selection a little, in view of the existence of hypertoxic harmful substance bioxin in the flying dust, must guarantee that flying dust can have the sufficient time to decompose fully after spraying into kiln.Through constantly groping experiment, when the flying dust drop point that sprays into apart from the distance of kiln hood greater than 15 meters, and spray in the time of a little should being located at kiln hood, can guarantee the harmlessness disposing of flying dust.
Flying dust jetting device in the step (3) can be burner or spray gun device.
Flying dust in the step (3) sprays into a little is located at kiln hood, is specially burner or the spray gun of being located at kiln hood, and the position of spray gun can be located at the interior any position of upper semi-circle of kiln hood circular radius (being the radius of kiln).
The invention has the beneficial effects as follows:
1, sprays into and a little be located at kiln hood, make full use of the high temperature of cement kiln, alkaline atmosphere, can effectively hypertoxic harmful substance bioxin in the flying dust be resolved into fully materials such as the water of environmental sound and carbon dioxide, guaranteed the harmless treatment of flying dust.
2, flying dust burns in kiln, can not separate out with the heavy metal in the flying dust by cement solidification, enters cement products at last, and both twice laids do not have secondary pollution again.
3, technology is novel unique, simple and practical; Process is continuous, automatic, safe and reliable.
Description of drawings
The invention will be further described in conjunction with the accompanying drawings and embodiments:
Fig. 1 is a kind of process chart of new processing method of flying dust.
Fig. 2 is the structural representation of spray gun present position.
Among the figure: 1. automotive tank car, the pipeline that 2. puts in storage, 3. ash-storing bin, 4. metering device, 5. strength is carried storehouse, 6. conveyance conduit, 7. bag collector, 8. burner, 9. rotary kiln.
The specific embodiment
Embodiment 1:
The new processing method of the described a kind of flying dust of present embodiment, technological process be as shown in Figure 1:
(1) after the automotive tank car 1 that loads flying dust enters factory,, through the pipeline 2 that puts in storage flying dust is squeezed in the ash-storing bin 3 and to be deposited by self-contained vacuum pressure;
(2) flying dust of ash-storing bin 3 is by metering device 4 metering and blankings, and the blanking amount is according to the difference of the chlorinity of flying dust, be controlled at the 200-1000 kilogram/hour, enter strength then and carry storehouse 5;
(3) strength carries the flying dust in storehouse 5 to dispose burner 8 by strength along the flying dust that conveyance conduit 6 is transported to kiln hood immediately, is injected in the rotary kiln 9 by burner 8 and burns;
(4) the main harmful components heavy metal element in the flying dust, in being added into kiln system after, be cured in the cement composition, can not separate out;
(5) the harmful De bioxin of the severe toxicity that contains in the flying dust in kiln more than 1000 ℃ under the high temperature, thoroughly resolves into materials such as the water of environmental sound and carbon dioxide, has solved flying dust Zhong bioxin and has been difficult to disposal concerns.
Squeeze into when depositing in the ash-storing bin 3 when flying dust, the bag collector 7 that is positioned at ash-storing bin 3 upper ends is by its film, and the dust retaining that rises in bag, is reduced dust pollution.
In the present embodiment, the metering device 4 in the step (2) is a weigher, and the blanking amount is controlled at 500 kilograms/hour.
Chlorine element in the flying dust also is an one of the chief elements, it is bigger to the influence of kiln system, when the content of Cl element in the kiln is higher, can cause the enrichment circulation of chlorine in the kiln system and in whole kiln system, form skinning, so just not only cause the decline of grog output, also cause the disorder of whole kiln system; The raw material that can be used as grog when the chlorine element is an amount of participate in reaction.Chlorinity in the cement raw material is very low, as long as control flying dust blanking amount, just can control the content of chlorine in the kiln, reaches the restriction of country to the chlorinity in the cement, must not surpass 0.06% standard.
When rotary kiln ran well in the present embodiment, the kiln hood gas temperature was stabilized in 1750 ℃, and main chemical reactions is:
Inorganic matter (calcareous, siliceous, irony, aluminium matter) → dicalcium silicate (2CaOSiO
2)+tricalcium silicate (3CaOSiO
2)+tricalcium aluminate (3CaOAl
2O
3)+tetra calcium aluminoferrite (4CaOAl
2O
3Fe
2O
3)
Organic matter 2CxHyOz+ (2x+y/2-z) O
2→ 2xCO
2+ yH
2The O+ heat
In view of the existence of hypertoxic harmful substance bioxin in the flying dust, must guarantee that flying dust can have the sufficient time to decompose fully after spraying into kiln.When the flying dust drop point that sprays into apart from the distance of kiln hood greater than 15 meters, and spray in the time of a little should being positioned at kiln hood, can guarantee the harmlessness disposing of flying dust.In the present embodiment, the flying dust drop point that sprays into is 22 meters apart from the distance of kiln hood, and sprays into a little to the flying dust of kiln hood and dispose burner 8.
Embodiment 2:
The new processing method of the described a kind of flying dust of present embodiment, technological process be as shown in Figure 1 and Figure 2:
(1) after the automotive tank car 1 that loads flying dust enters factory,, through the pipeline 2 that puts in storage flying dust is squeezed in the ash-storing bin 3 and to be deposited by self-contained vacuum pressure;
(2) flying dust of ash-storing bin 3 is by metering device 4 metering and blankings, and the blanking amount is according to the difference of the chlorinity of flying dust, be controlled at the 200-1000 kilogram/hour, enter strength then and carry storehouse 5;
(3) the strength flying dust of carrying storehouse 5 is transported to the flying ash spray gun device of kiln hood by strength along conveyance conduit 6 immediately, is injected to by spray gun and carries out burning disposal in the rotary kiln 9;
(4) heavy metal element in the flying dust, in being added into kiln system after, with after cement raw material carries out complex physico-chemical, heavy metal is cured in the cement, as the part of cement, and can not separate out;
(5) the harmful De bioxin of the severe toxicity that contains in the flying dust in kiln more than 1000 ℃ under the high temperature, thoroughly resolves into materials such as the water of environmental sound and carbon dioxide.
In the present embodiment, the metering device 4 in the step (2) is a weigher, and the blanking amount is controlled at 900 kilograms/hour.
When rotary kiln ran well in the present embodiment, the kiln hood gas temperature was stabilized in 1550 ℃.
In the present embodiment, the flying dust drop point that sprays into is apart from 26 meters of the distances of kiln hood, and sprays into the spray gun that a little is located at kiln hood, and the position of spray gun can be located at any position in the upper semi-circle of kiln hood circular radius (being the radius of kiln).
Claims (6)
1, a kind of new processing method of flying dust, it is characterized in that: its technological process may further comprise the steps:
(1) after the automotive tank car that loads flying dust enters factory,, through the pipeline that puts in storage flying dust is squeezed in the ash-storing bin and to be deposited by self-contained vacuum pressure;
(2) flying dust of ash-storing bin is by metering device metering and blanking, and the blanking amount is according to the difference of the chlorinity of flying dust, be controlled at the 200-1000 kilogram/hour, enter strength then and carry the storehouse;
(3) the strength flying dust of carrying the storehouse is transported to the flying dust jetting device of kiln hood by strength along conveyance conduit immediately, is injected in the rotary kiln by the flying dust jetting device and burns;
(4) after the heavy metal element in the flying dust was added in the kiln system, with after cement raw material carries out complex physico-chemical, heavy metal was cured in the cement, as the part of cement, and can not separate out;
(5) the harmful De bioxin of the severe toxicity that contains in the flying dust in kiln more than 1000 ℃ under the high temperature, thoroughly resolves into materials such as the water of environmental sound and carbon dioxide.
2, the new processing method of a kind of flying dust as claimed in claim 1 is characterized in that: the kiln hood gas temperature is stabilized in 1000-1750 ℃.
3, the new processing method of a kind of flying dust as claimed in claim 1 is characterized in that: the flying dust drop point that sprays into apart from the distance of kiln hood greater than 15 meters.
4, the new processing method of a kind of flying dust as claimed in claim 1 is characterized in that: the flying dust jetting device is burner or spray gun device.
5, the new processing method of a kind of flying dust as claimed in claim 1 is characterized in that: kiln hood a little is located in spraying into of flying dust, is specially burner or the spray gun of being located at kiln hood.
6, the new processing method of a kind of flying dust as claimed in claim 5 is characterized in that: the position of spray gun is located at the interior any position of upper semi-circle of kiln hood circular radius.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100850965A CN101569890B (en) | 2009-05-25 | 2009-05-25 | New disposal method of fly ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100850965A CN101569890B (en) | 2009-05-25 | 2009-05-25 | New disposal method of fly ash |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101569890A true CN101569890A (en) | 2009-11-04 |
| CN101569890B CN101569890B (en) | 2011-01-05 |
Family
ID=41229450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100850965A Active CN101569890B (en) | 2009-05-25 | 2009-05-25 | New disposal method of fly ash |
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|---|---|
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106282541A (en) * | 2016-09-19 | 2017-01-04 | 山东石横特钢集团有限公司 | A kind of environmental protection closed raw material blending method |
| CN106524183A (en) * | 2016-10-25 | 2017-03-22 | 重庆文渠环保科技有限公司 | Method for achieving harmless disposal of garbage fly ash by means of rotary kiln technology |
| US9744393B1 (en) | 2016-12-18 | 2017-08-29 | Guangdong Decheng Environmental Sci-Tech Co., Ltd. | Method of removing toxins from fly ash |
| CN110586620A (en) * | 2019-09-18 | 2019-12-20 | 北京金隅琉水环保科技有限公司 | Metering and weighing device, fly ash treatment system and fly ash treatment method |
| CN113883529A (en) * | 2020-07-01 | 2022-01-04 | 袁安之 | Immediate circulation treatment technology and method for incineration fly ash of industrial kiln incineration waste |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1585801A (en) * | 1977-01-04 | 1981-03-11 | Kroyer K K K | Methods and apparatus for production of cements |
| EP1935477B1 (en) * | 2005-08-26 | 2015-05-27 | Taiheiyo Cement Corporation | Apparatus and method for dissolution/reaction |
-
2009
- 2009-05-25 CN CN2009100850965A patent/CN101569890B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106282541A (en) * | 2016-09-19 | 2017-01-04 | 山东石横特钢集团有限公司 | A kind of environmental protection closed raw material blending method |
| CN106524183A (en) * | 2016-10-25 | 2017-03-22 | 重庆文渠环保科技有限公司 | Method for achieving harmless disposal of garbage fly ash by means of rotary kiln technology |
| US9744393B1 (en) | 2016-12-18 | 2017-08-29 | Guangdong Decheng Environmental Sci-Tech Co., Ltd. | Method of removing toxins from fly ash |
| EP3335810A1 (en) | 2016-12-18 | 2018-06-20 | Guangdong Decheng Environmental Sci-Tech Co. Ltd | Method of removing toxins from fly ash |
| CN110586620A (en) * | 2019-09-18 | 2019-12-20 | 北京金隅琉水环保科技有限公司 | Metering and weighing device, fly ash treatment system and fly ash treatment method |
| CN113883529A (en) * | 2020-07-01 | 2022-01-04 | 袁安之 | Immediate circulation treatment technology and method for incineration fly ash of industrial kiln incineration waste |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101569890B (en) | 2011-01-05 |
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| C14 | Grant of patent or utility model | ||
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Owner name: BEIJING CEMENT PLANT CO., LTD. Free format text: FORMER OWNER: BEIJING XINBEISHUI CEMENT CO., LTD. Effective date: 20120321 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20120321 Address after: 102202 Beijing city Changping District Beixiaoying Patentee after: Beijing Cement Plant Co., Ltd. Address before: 102202 Beijing City, Changping District Beijing New Taipei water Beixiaoying cement limited liability company Patentee before: Beijing Xinbeishui Cement Co., Ltd. |
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Effective date of registration: 20161013 Address after: 102202 Beijing city Changping District Machi Town Beixiaoying village of Beijing cement factory Patentee after: Beijing Jinyu North Water Environmental Protection Science and technology limited company Address before: 102202 Beijing city Changping District Beixiaoying Patentee before: Beijing Cement Plant Co., Ltd. |