CN113102450A - Method for treating and safely burying waste incineration fly ash - Google Patents
Method for treating and safely burying waste incineration fly ash Download PDFInfo
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- CN113102450A CN113102450A CN202110351178.0A CN202110351178A CN113102450A CN 113102450 A CN113102450 A CN 113102450A CN 202110351178 A CN202110351178 A CN 202110351178A CN 113102450 A CN113102450 A CN 113102450A
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- 239000010881 fly ash Substances 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 72
- 238000004056 waste incineration Methods 0.000 title claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 46
- 238000011282 treatment Methods 0.000 claims abstract description 34
- 238000001125 extrusion Methods 0.000 claims abstract description 33
- 239000002738 chelating agent Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000004568 cement Substances 0.000 claims abstract description 20
- 239000010802 sludge Substances 0.000 claims abstract description 19
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims abstract description 14
- 238000003860 storage Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims description 23
- 238000012423 maintenance Methods 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 4
- 238000010169 landfilling Methods 0.000 claims 1
- 238000011049 filling Methods 0.000 abstract description 11
- 230000018044 dehydration Effects 0.000 abstract description 6
- 238000006297 dehydration reaction Methods 0.000 abstract description 6
- 238000002386 leaching Methods 0.000 abstract description 3
- 231100000331 toxic Toxicity 0.000 abstract description 2
- 230000002588 toxic effect Effects 0.000 abstract description 2
- 239000002956 ash Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
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- 239000002699 waste material Substances 0.000 description 5
- 238000005056 compaction Methods 0.000 description 4
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- 238000004519 manufacturing process Methods 0.000 description 4
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- 239000000047 product Substances 0.000 description 4
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- 230000007613 environmental effect Effects 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000013522 chelant Substances 0.000 description 2
- 230000009920 chelation Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002920 hazardous waste Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
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- 238000011105 stabilization Methods 0.000 description 2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B1/00—Dumping solid waste
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/20—Agglomeration, binding or encapsulation of solid waste
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B2101/00—Type of solid waste
- B09B2101/30—Incineration ashes
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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/20—Waste processing or separation
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for treating and safely burying waste incineration fly ash, which comprises the steps of mixing and stirring fly ash, early strength cement, calcium sulfate and chelating agent solution to obtain a mixed material, adding the mixed material into a movable bin, wherein each wall of the movable bin is detachable and encloses a cavity with a regular polyhedron structure, carrying out extrusion forming on the mixed material to obtain a solidified body serving as a burying unit, curing the burying unit, transporting the cured burying unit to a burying operation storage area for stacking, and carrying out crack filling treatment by adopting municipal sludge with the water content of less than 60% after dehydration to finish the fly ash treatment and the safe burying. The landfill body obtained by the method has excellent strength, stability and durability, the applicable height difference range of the landfill body is large, the storage capacity occupied by landfill is small, the safety of the pile body is high, and the risk of toxic leaching is effectively reduced.
Description
Technical Field
The invention relates to the field of fly ash treatment, in particular to a method for treating and safely burying waste incineration fly ash.
Background
At present, the modes for treating the fly ash mainly comprise two technical routes of land disposal (including geology) and building material utilization. The land treatment comprises landfill after solidification and stabilization, deep mine storage and the like, the land treatment technology is mature, the flow is short, the exposure way of pollutants can be effectively cut off, the aim of minimizing environmental risks can be fulfilled, and the method is a mainstream technical treatment route. The building material utilization comprises cement kiln cooperative treatment, sintering, melting and the like, the building material utilization technology is immature, the process is complex, the pollutant exposure ways are multiple, and the aim of minimizing the environmental risk is not favorably realized on the whole.
The solidification and stabilization treatment in the dangerous waste safe landfill site is the most reliable treatment mode at present, but considering that the fly ash generation amount is large and the storage capacity of the dangerous waste safe landfill site is limited, the comprehensive cost of the fly ash entering the dangerous waste landfill site after being solidified is too high from the aspect of economic cost. In 2008, the pollution control standard of the domestic garbage landfill is issued in China, and the domestic garbage landfill can be treated by landfill in different areas under the condition that strict index requirements reach standards. The main fly ash disposal mode in the industry is 'chelation + landfill', wherein the chelation process is mainly to add a chelating agent to lock heavy metals in the fly ash and prevent the heavy metals from entering soil or water body to cause pollution. The landfill process is generally divided into two types: directly burying scattered ash in a special hazardous waste landfill site; and secondly, filling the garbage into a ton bag, and stacking the garbage into a special area of a household garbage landfill. As fly ash is a hazardous waste, the industry's disposal requirements and management of this pollutant are also increasing.
The existing disposal method has the following technical problems or hidden dangers:
firstly, ash is scattered and buried, the dirty difference of the site environment is difficult to control, the sewage disposal and flow distribution are not in place, the floating and the loss are easy to cause in the strong wind and rainfall weather, the secondary pollution is generated, and a small amount of clear water is needed to be sprayed in the site operation to prevent the ash from flying.
Secondly, the ton bags are buried, gaps among the ton bags are large, the storage capacity is not effectively utilized, the ton bags are extruded, corroded and aged along with the increase of the pile body and the increase of the burying time, ash residues are leaked, and secondary pollution is caused.
The physical strength index of the final product is not considered in the technology, so that the stability of the pile and the risk of secondary pollution are enlarged if the product is disposed in a valley type landfill with large landfill height difference.
With the coming of new related standards, the strength index of the fly ash condensate is taken as a key requirement, and by improving the strength of the fly ash condensate, the stability of a landfill body can be enhanced firstly, the landfill capacity can be reasonably utilized secondly, and the risk of soaking and loss of ash slag can be reduced thirdly, so that secondary pollution is prevented.
The existing curing and stabilizing method generally adopts the following processes: metering fly ash and chelating agent solution, mixing materials, filling into a ton bag, inspecting and treating by landfill. The fly ash after being chelated and solidified is generally treated by special landfill, and although the method meets the requirement of the standard landfill in all aspects, the following problems still exist:
(1) the addition ratio of the materials for adding the chelating agent into the fly ash is large, and in addition, the fly ash chelate has cracks or gaps, so that the actual volume is greatly increased, and the stack body can be only filled to a certain height to seal the yard, so that more land resources are occupied;
(2) the conventional method wraps materials such as ton bags, films and the like, so that the volume of the cured bodies is increased, the regular smoothness among the cured bodies is difficult to realize, gaps among the cured bodies are large, the risk of instability or collapse of the pile body exists along with the increase of the landfill height, and the operation cost is increased to a certain extent;
(3) the traditional method has the advantages that the permeability coefficient of the solidified body is high, the water seepage and storage functions are good after the solidified body meets water, the strength of the solidified body is reduced, and the instability of the pile body is increased to a certain extent;
(4) the traditional method for chelating and curing generally needs at least 3d of curing, and more material-storing curing workshops need to be designed for large fly ash landfill sites, so that the construction and operation cost is increased.
Based on the above situation, it is necessary to develop a method for rapidly treating fly ash and safely burying the fly ash.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for treating and safely burying waste incineration fly ash, wherein the obtained landfill body has excellent strength, stability and durability, the applicable height difference range of the landfill body is large, the storage capacity occupied by landfill can be reduced, the pile safety is improved, and the toxic leaching risk is reduced.
In order to solve the technical problems, the invention adopts the following technical scheme.
A method for treating and safely burying waste incineration fly ash comprises the following steps:
s1, chelating: mixing and stirring fly ash, early strength cement, calcium sulfate and chelating agent solution to obtain a mixed material;
s2, extrusion forming: adding a mixed material into a movable storage bin, wherein each wall of the movable storage bin is detachable, each wall encloses a cavity with a regular polyhedron structure, and the mixed material is extruded and molded to obtain a solidified body serving as a landfill unit;
s3, maintenance: maintaining the landfill unit;
s4, landfill: and (4) transporting the cured landfill unit to a landfill operation reservoir area for stacking, and performing crack pouring treatment by adopting municipal sludge to finish fly ash treatment and safe landfill.
In the method for treating the waste incineration fly ash and safely burying, the landfill operation reservoir area is preferably located in a valley type landfill site, and the landfill height is 20-100 m.
Preferably, in step S1, the chelating agent solution is prepared by mixing a chelating agent and water, and the mass ratio of the fly ash, the early strength cement, the calcium sulfate, the chelating agent and the water is 100: 10-20: 3-5: 2-3: 30-60.
In the method for treating waste incineration fly ash and safely burying, the early strength type cement is preferably 42.5R early strength type cement.
Preferably, in step S2, the movable bin includes a bottom wall and a plurality of side walls, the bottom wall and the side walls enclose a cavity of regular polyhedron structure, the top surface of the movable bin is open, after the mixed material is loaded into the movable bin, the mixed material is extruded and formed by a hydraulic device, and the hydraulic device is provided with an extrusion plate, which forms the top wall of the movable bin.
Preferably, in the method for treating and safely burying the waste incineration fly ash, the regular polyhedron structure is a cube structure, the bottom wall and each side wall are both made of steel plates, and the thickness of each steel plate is 2 cm-3 cm.
In the method for treating waste incineration fly ash and safely burying, it is preferable that the mixing and uniformly stirring process is performed in a stirrer in step S1.
Preferably, in step S2, the plurality of movable bins are provided, and in the process of performing extrusion molding on the mixed material in the previous movable bin, the next movable bin moves to a discharge port of the mixer to perform charging, and the above steps are repeated to obtain a plurality of filler units.
Preferably, in the step S4, the stacking is a layered stacking, each layer has a gap between adjacent landfill units of less than 2cm, each layer is subjected to crack filling treatment and surface leveling by using municipal sludge, the thickness of the surface leveling is 3 cm-5 cm, and the municipal sludge is dewatered and has a water content of less than 60%.
In the method for treating waste incineration fly ash and safely burying, in step S1, the stirring time is preferably 120S to 180S.
In the method for treating waste incineration fly ash and safely burying, in step S2, the pressure for extrusion molding is preferably 100 kN-150 kN.
In the method for treating waste incineration fly ash and safely burying, in step S3, the curing time is preferably 24-36 hours.
In the method for treating waste incineration fly ash and safely burying, it is preferable that the extrusion molding is performed and then the mixture is left to stand for 10 to 15min in step S2.
Compared with the prior art, the invention has the advantages that:
(1) the domestic fly ash landfill (also called as ash landfill) is generally used for landfill on flat ground, the landfill height is generally 10-20 m, and when the height difference of a landfill body is large, the self-stability and the heavy load of the whole landfill body put higher requirements on the properties of the landfill body. The invention can be suitable for valley type landfill sites with large height difference, the landfill height reaches 50-100 m, the pile body self-stability and the quality are not influenced by the height difference, the land area is reduced, and the national land resources are saved.
The method of the invention adjusts the fly ash chelating and curing formula, the traditional treatment mode is the treatment mode of fly ash + chelating agent or fly ash + common cement + chelating agent, the invention adds early strength type cement in the treatment formula through the re-establishment of the formula, and is supplemented with a certain amount of calcium sulfate, thereby being capable of rapidly fixing pollutants, and the fly ash treatment product can rapidly generate strength and can reduce the dosage of additives.
In the traditional method, direct curing is carried out after bagging by ton, and small holes or gaps are formed in fly ash treatment products in the direct curing process, so that the compactness of a cured body is low, the cured body is easy to crack or break under the influence of external pressure, the strength of the cured body is influenced, and a series of safety problems in the subsequent landfill operation process and the stack maintenance process can be caused. Aiming at the defects, the invention improves the front-end process, removes redundant air by prolonging the stirring time, releases more air in the fly ash chelate and makes the materials more uniform, the stirring enters a die filling stage, a specific movable bin is adopted for die filling, and the extrusion compaction is adopted, so that the forming effect of the discharged materials is better, the unevenness among cured bodies of ton bags is reduced, the extrusion process can reduce the storage capacity by 10-20%, and the service life of a landfill is prolonged.
(2) The traditional method has the maintenance time of 3d or more, and for a large fly ash landfill, the maintenance time is increased by 1d, which means that more fields need to be added in a maintenance workshop.
(3) Through the synergistic interaction effects of formula adjustment, process improvement, maintenance time reduction and the like, the test shows that the water content, the heavy metal leaching toxicity index and the like of the chelating solidification body meet the standard requirements, the compressive strength can reach more than 3MPa (about 1MPa in the traditional method), and the permeability coefficient can reach 10-7cm/s。
(4) The method of the invention does not need to adopt ton bag wrapping, after the workshop is well maintained, the fly ash is transferred to a fly ash landfill site by a sealed transfer vehicle, and the landfill is carried out by gradually layering and partitioning in a stacking way, thereby reducing the production and operation cost. Traditional mode adopts ton bag landfill, because there is the unevenness phenomenon in the ton bag, has great gap between the ton bag body, leads to the yawing force between each ton bag body and extrusion force to be in unstable state, generally takes filling loess between the ton bag body, but the self-adhesive ability between loess and the ton bag body is relatively poor, when the heap fill to take the altitude, whole landfill heap body also can have certain unstability risk. Loess is a national land resource, and the use of loess in large quantities is contrary to the national environmental protection requirements. The invention adopts the municipal sludge with the water content of less than 60 percent after dehydration as the crack pouring material, and the sludge is transported to the site by the transfer vehicle for crack pouring and leveling operation, thereby achieving the purpose of waste preparation by waste, and also leading the adhesion effect among the fly ash piles to be higher and the stability of the later-period piles to be high.
In conclusion, the regular storage bin (a cube, a cuboid and other regular polyhedrons) is added on the basis of the traditional treatment process, the materials are discharged and unloaded to a maintenance workshop for maintenance for 24-36 h after the processes of formula adjustment, stirring time extension and extrusion forming are carried out, and the materials are delivered to a landfill site for landfill after being inspected to be qualified. Through the extrusion process, the volume of the fly ash chelated product can be reduced by 10-20%, and the compactness of the fly ash can be changed from 0.6-0.81 g/cm3Increasing the concentration to 1.8-2.2 g/cm3The compression strength is improved by 2-3 times on the basis of the traditional process, the permeability coefficient is further reduced, the municipal sludge with the water content of less than 60% is used as a crack pouring material, the bonding performance between the fly ash chelating solidification bodies is enhanced, the transverse shearing force between the pile bodies is increased, and the stability of the fly ash landfill with larger height difference is greatly improved.
Drawings
FIG. 1 is a process flow diagram of a method for treating fly ash from waste incineration and safe landfill in example 1 of the present invention.
Fig. 2 is a schematic sectional view showing a movable silo containing materials in example 1 of the present invention.
Fig. 3 is a schematic structural diagram of a reservoir region landfill in embodiment 1 of the present invention.
Illustration of the drawings:
1. a bottom wall; 2. a side wall; 3. mixing the materials; 4. a landfill unit; 5. municipal sludge; 6. a pressing plate; 7. a telescopic oil cylinder; 8. a movable universal wheel.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention. The materials and equipment used in the following examples are commercially available.
Example 1:
the invention relates to a method for treating and safely burying waste incineration fly ash, which comprises the following steps as shown in figure 1:
s1, chelating: weighing fly ash, early strength cement, calcium sulfate and chelating agent solution according to a ratio, mixing the chelating agent solution with water at a mass ratio of 100: 15: 3: 2.5: 40, adding the raw materials into a stirrer (the bin capacity is 3 m)3) And (4) mixing and stirring for 3 minutes to obtain a mixed material 3.
S2, extrusion forming: adding the mixed material 3 into a movable bin, manually sampling by using tools such as a shovel and the like, and sending the sampled materials to a laboratory for detection and analysis. As shown in fig. 2, each wall of the movable bunker is detachable, each wall encloses a cavity with a regular polyhedron structure, the mixed material 3 is extruded and molded in the movable bunker at a pressure of 100kN, and after extrusion molding, the mixture is kept stand for 10min to obtain a solidified body which is used as a landfill unit 4. The movable material bins can be arranged in a plurality of manners, in the extrusion forming process of the previous movable material bin, the next movable material bin moves to the discharge port arranged on the stirring machine to be charged, the circulation is carried out, the efficiency is improved, and the plurality of landfill units 4 are obtained.
S3, maintenance: the landfill unit 4 is maintained for 24 hours, and the strength can reach 3 MPa.
S4, landfill: and (4) transporting the cured landfill unit 4 to a landfill operation reservoir area for stacking, and performing crack pouring treatment by adopting municipal sludge 5 to finish fly ash treatment and safe landfill.
In this embodiment, the landfill operation reservoir area is a valley type landfill site, and the landfill height is 20 meters.
In step S1, the early strength cement is 42.5R, the chelating agent is TS-300, and Tosoh (China) invests in the limited company for production.
In step S2, as shown in fig. 2, the movable bin includes a bottom wall 1 and a plurality of side walls 2, the bottom wall 1 and each side wall 2 form a cavity of a cubic structure, the top surface of the movable bin is open, after the mixed material 3 is loaded into the movable bin, the mixed material 3 is extruded and molded by a hydraulic device, the hydraulic device is provided with a telescopic cylinder 7 and an extrusion plate 6 which are connected with each other, the extrusion plate 6 forms the top wall of the movable bin, and the hydraulic device extrudes the mixed material 3 through the telescopic cylinder 7. The bottom wall 1 and each side wall 2 are formed by steel plates having a thickness of 2cm, and each steel plate can be connected by means of a bolt and a snap, but is not limited thereto. A movable universal wheel 8 can be arranged under the movable bin.
In step S4, as shown in fig. 3, the stacking is a layered stacking, the filler units 4 of adjacent upper and lower layers are arranged in a staggered manner, the gap between adjacent landfill units 4 in each layer is less than 2cm, each layer is stacked, the joint filling treatment and the surface leveling are performed by using the municipal sludge 5 with the water content of less than 60% after the dehydration, and the thickness of the surface leveling is 3cm to 5 cm.
Through sampling detection, the compressive strength of the solidified body obtained by the method of the embodiment reaches 3MPa, the volume of the solidified body is reduced by 10 percent through an extrusion process, and the compaction density reaches 1.8g/cm3The curing time is shortened from at least 3 days and more to 1 day, and all indexes meet the standard requirements.
Example 2:
the invention relates to a method for treating and safely burying waste incineration fly ash, which comprises the following steps as shown in figure 1:
s1, chelating: weighing fly ash, early strength cement, calcium sulfate and chelating agent solution according to a ratio, mixing the chelating agent solution with water at a mass ratio of 100: 20: 3.5: 3: 45, adding the raw materials into a stirrer (the bin capacity is 3 m)3) And (4) mixing and stirring for 3 minutes to obtain a mixed material 3.
S2, extrusion forming: adding the mixed material 3 into a movable bin, wherein each wall of the movable bin is detachable as shown in fig. 2, each wall encloses a cavity with a regular polyhedron structure, extruding and forming the mixed material 3 in the movable bin at the extrusion forming pressure of 110kN, standing for 12min to obtain a solidified body, and using the solidified body as a landfill unit 4.
S3, maintenance: and curing the landfill unit 4 for 24 hours, wherein the strength can reach 3.5 MPa.
S4, landfill: and (4) transporting the cured landfill unit 4 to a landfill operation reservoir area for stacking, and performing crack pouring treatment by adopting municipal sludge 5 to finish fly ash treatment and safe landfill.
In this embodiment, the landfill operation reservoir area is a valley type landfill site, and the landfill height is 30 meters.
In step S1, the early strength cement is 42.5R, the chelating agent is TS-300, and Tosoh (China) invests in the limited company for production.
In step S2, as shown in fig. 2, the structure of the movable bin of the present embodiment is the same as that of the movable bin of embodiment 1.
In step S4, as shown in fig. 3, the stacking is a layered stacking, the filler units 4 of adjacent upper and lower layers are arranged in a staggered manner, the gap between adjacent landfill units 4 in each layer is less than 2cm, each layer is stacked, the joint filling treatment and the surface leveling are performed by using the municipal sludge 5 with the water content of less than 60% after the dehydration, and the thickness of the surface leveling is 3cm to 5 cm.
Through sampling detection, the compressive strength of the solidified body obtained by the method reaches 3.5MPa, the volume of the solidified body is reduced by 9.5 percent through an extrusion process, and the compaction density reaches 1.9g/cm3The curing time is shortened from at least 3 days and more to 1 day.
Example 3:
the invention relates to a method for treating and safely burying waste incineration fly ash, which comprises the following steps as shown in figure 1:
s1, chelating: weighing fly ash, early strength cement, calcium sulfate and chelating agent solution according to a ratio, mixing the chelating agent solution with water at a mass ratio of 100: 18: 4: 2.8: 50, adding the raw materials into a stirrer (the bin capacity is 3 m)3) And (4) mixing and stirring for 3 minutes to obtain a mixed material 3.
S2, extrusion forming: adding the mixed material 3 into a movable bin, wherein each wall of the movable bin is detachable as shown in fig. 2, each wall encloses a cavity with a regular polyhedron structure, extruding and forming the mixed material 3 in the movable bin at the extrusion forming pressure of 110kN, standing for 15min to obtain a solidified body, and using the solidified body as a landfill unit 4.
S3, maintenance: and curing the landfill unit 4 for 24 hours, wherein the strength can reach 3.8 MPa.
S4, landfill: and (4) transporting the cured landfill unit 4 to a landfill operation reservoir area for stacking, and performing crack pouring treatment by adopting municipal sludge 5 to finish fly ash treatment and safe landfill.
In this embodiment, the landfill operation reservoir area is a valley type landfill site, and the landfill height is 100 meters.
In step S1, the early strength cement is 42.5R, the chelating agent is TS-300, and Tosoh (China) invests in the limited company for production.
In step S2, as shown in fig. 2, the structure of the movable bin of the present embodiment is the same as that of the movable bin of embodiment 1.
In step S4, as shown in fig. 3, the stacking is a layered stacking, in each layer, the gap between adjacent landfill units 4 is less than 2cm, each layer is stacked, the joint filling treatment and the surface leveling are performed by using the municipal sludge 5 with the water content of less than 60% after the dehydration, and the thickness of the surface leveling is 3cm to 5 cm.
Through sampling detection, the compressive strength of the solidified body obtained by the method reaches 3.8MPa, the volume of the solidified body is reduced by 10 percent through an extrusion process, the compaction density reaches 1.85g/cm3, and the curing time is shortened to 1 day from at least 3 days and above.
Comparative example 1:
a method for treating and safely burying waste incineration fly ash comprises the following steps:
s1, chelating: weighing fly ash, ordinary cement (non-early-strength type) and chelating agent solution according to a ratio, mixing the chelating agent solution with water at a mass ratio of 100: 20: 2: 40, adding the raw materials into a stirrer (bin capacity of 3 m)3) And (4) mixing and stirring for 3 minutes to obtain a mixed material 3.
S2, extrusion forming: and adding the mixed material 3 into the movable bin, and carrying out extrusion forming on the mixed material 3 in the movable bin at the extrusion forming pressure of 110kN to obtain a solidified body serving as the landfill unit 4.
S3, maintenance: the landfill unit 4 was cured for 24 hours with a strength of 1.5 MPa.
S4, landfill: and (4) transporting the cured landfill unit 4 to a landfill operation reservoir area for stacking, and performing crack pouring treatment by adopting municipal sludge 5 to finish fly ash treatment and safe landfill.
In this comparative example, the reservoir area for the landfill operation was a valley-type landfill site, and the landfill height was 20 meters.
In step S1, the ordinary cement is 42.5, the chelating agent is TS-300, and Tosoh (China) invests in the limited company to produce.
In step S2, as shown in fig. 2, the structure of the movable silo of this comparative example is the same as that of example 1.
In step S4, as shown in fig. 3, the stacking is a layered stacking, in each layer, the gap between adjacent landfill units 4 is less than 2cm, each layer is stacked, the joint filling treatment and the surface leveling are performed by using the municipal sludge 5 with the water content of less than 60% after the dehydration, and the thickness of the surface leveling is 3cm to 5 cm.
Through sampling detection, the compressive strength of the solidified body obtained by the method is 1.5MPa, the compressive strength effect of the method cannot be achieved, the volume of the solidified body is reduced by 8 percent through an extrusion process, and the compacted density reaches 1.65g/cm3。
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the spirit and scope of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention.
Claims (10)
1. A method for treating and safely burying waste incineration fly ash is characterized by comprising the following steps:
s1, chelating: mixing and stirring fly ash, early strength cement, calcium sulfate and chelating agent solution to obtain a mixed material (3);
s2, extrusion forming: adding the mixed material (3) into a movable storage bin, wherein each wall of the movable storage bin is detachable, each wall encloses a cavity with a regular polyhedron structure, and the mixed material (3) is extruded and molded to obtain a solidified body serving as a landfill unit (4);
s3, maintenance: curing the landfill unit (4);
s4, landfill: and (3) transporting the cured landfill unit (4) to a landfill operation reservoir area for stacking, and performing crack pouring treatment by adopting municipal sludge (5) to finish fly ash treatment and safe landfill.
2. The method of claim 1, wherein the landfill yard is a valley type landfill with a height of 20-100 m.
3. The method according to claim 1, wherein in step S1, the chelating agent solution is prepared by mixing a chelating agent with water, and the mass ratio of the fly ash, the early strength cement, the calcium sulfate, the chelating agent and the water is 100: 10-20: 3-5: 2-3: 30-60.
4. The method of waste incineration fly ash disposal and safe landfill according to claim 3, wherein the early strength cement is 42.5R early strength cement.
5. The method for waste incineration fly ash treatment and safe landfill according to claim 1, wherein in step S2, the movable bunker includes a bottom wall (1) and a plurality of side walls (2), the bottom wall (1) and each side wall (2) enclose a cavity of a regular polyhedron structure, the top surface of the movable bunker is open, after the mixed material (3) is loaded into the movable bunker, the mixed material (3) is extruded and formed by a hydraulic device, the hydraulic device is provided with an extrusion plate (6), and the extrusion plate (6) forms the top wall of the movable bunker.
6. The method for treating and safely landfilling fly ash from waste incineration according to claim 5, wherein the regular polyhedron structure is a cube structure, and the bottom wall (1) and each side wall (2) are both made of steel plates, and the thickness of the steel plates is 2cm to 3 cm.
7. The method for treating fly ash from waste incineration and safe landfill according to any one of claims 1 to 6, wherein the step S1 is performed in a blender; and/or in the step S2, a plurality of movable bins are arranged, in the process that the previous movable bin carries out extrusion forming on the mixed material (3), the next movable bin moves to a discharge port arranged on the stirrer to carry out charging, and the steps are repeated to obtain a plurality of filler units (4).
8. The method for treating and safely burying waste incineration fly ash according to any one of claims 1 to 6, wherein in step S4, the stacking is layered stacking, gaps between adjacent landfill units (4) in each layer are less than 2cm, each layer is subjected to crack pouring treatment and surface leveling by adopting municipal sludge, the thickness of the surface leveling is 3 cm-5 cm, and the municipal sludge is dewatered and has a water content of less than 60%.
9. The method for treating waste incineration fly ash and safely burying according to any one of claims 1 to 6, wherein in step S1, the stirring time is 120S to 180S; and/or in step S2, the pressure of the extrusion forming is 100 kN-150 kN; and/or in step S3, the curing time is 24-36 h.
10. The method for treating waste incineration fly ash and safely burying the waste incineration fly ash according to any one of claims 1 to 6, wherein the step S2 is performed by standing for 10 to 15min after the extrusion molding.
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| CN113877926A (en) * | 2021-10-22 | 2022-01-04 | 郑州绿清环保科技有限公司 | Method for curing waste incineration fly ash by using portland cement and chelating agent |
| CN113894134A (en) * | 2021-11-15 | 2022-01-07 | 福建龙净环保股份有限公司 | Hazardous waste landfill operation system and method |
| CN114160542A (en) * | 2021-11-08 | 2022-03-11 | 中煤科工集团西安研究院有限公司 | Method and structure for cooperatively disposing waste incineration fly ash underground mine |
| CN114210690A (en) * | 2021-12-17 | 2022-03-22 | 湖南军信环保股份有限公司 | Safe fly ash landfill method |
| CN115283394A (en) * | 2022-10-09 | 2022-11-04 | 徐州大成环境科技有限公司 | Fly ash landfill device for construction engineering |
| CN116140322A (en) * | 2022-09-22 | 2023-05-23 | 江苏生久环境科技有限公司 | Landfill fly ash landfill method |
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