CN114210690A - Safe fly ash landfill method - Google Patents
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- CN114210690A CN114210690A CN202111552968.1A CN202111552968A CN114210690A CN 114210690 A CN114210690 A CN 114210690A CN 202111552968 A CN202111552968 A CN 202111552968A CN 114210690 A CN114210690 A CN 114210690A
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- 239000010881 fly ash Substances 0.000 title claims abstract description 160
- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000013522 chelant Substances 0.000 claims abstract description 81
- 239000002738 chelating agent Substances 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 10
- 238000005056 compaction Methods 0.000 claims abstract description 7
- 239000010842 industrial wastewater Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims 2
- 150000004697 chelate complex Chemical class 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract description 8
- 238000003860 storage Methods 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 239000002956 ash Substances 0.000 description 9
- 229910001385 heavy metal Inorganic materials 0.000 description 5
- 238000002386 leaching Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 238000004056 waste incineration Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 241001494115 Stomoxys calcitrans Species 0.000 description 2
- 230000009920 chelation Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000010791 domestic waste Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 210000002489 tectorial membrane Anatomy 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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Classifications
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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
- B09B1/00—Dumping solid waste
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a safe fly ash landfill method, which comprises the following steps: mixing fly ash and a chelating agent to prepare a fly ash chelate; pouring the fly ash chelate into a groove of a region to be buried in a landfill site; compacting the fly ash chelate poured in the groove; and curing the formed chelate obtained after compaction until a fly ash solidified body is formed, and finishing safe landfill of the fly ash. The method for safely burying the fly ash can simplify the working procedures of the burying operation, improve the working efficiency, reduce the manual operation and reduce the operation risk of field operators, has the advantages of simple process, convenient operation, low treatment cost, high treatment efficiency, good treatment working condition, low environmental risk, high safety coefficient and the like, can realize the safe burying of the fly ash, has obvious advantages in the aspects of pile body safety, environmental safety and storage capacity saving, and has important significance for realizing the effective disposal of the fly ash.
Description
Technical Field
The invention belongs to the technical field of safe disposal of fly ash, and relates to a safe fly ash landfill method.
Background
With the popularization of the garbage incineration process, the treatment and disposal of fly ash generated by incineration face new challenges, the mainstream technology of the fly ash incineration treatment is to treat the fly ash and fill the treated fly ash into an ash landfill or a household garbage landfill for landfill, and in the current world with insufficient land resources, the storage capacity becomes a pain point of landfill, so how to solve the storage capacity and excavate the existing storage capacity resources becomes a bright point of the ash landfill technology. Meanwhile, with the higher and higher requirements of the treatment standard of the fly ash from waste incineration, the fly ash to be treated in landfill in a domestic waste landfill or a landfill special for stabilized fly ash must be subjected to stabilization and solidification in advance, and in order to avoid a great amount of flying dust generated in the fly ash landfill process, which harms the health of operators and pollutes the surrounding environment, the fly ash in the original powder state cannot be directly filled in a landfill area.
At present, the fly ash is generally disposed by landfill in a ton bag mode, however, the disadvantages of ton bag landfill are very obvious, and the specific situations are as follows:
(1) the surface of a solidified body after the ton bag is formed is uneven, and the size is not uniform, so that after a large number of ton bags are buried in a reservoir area, the flatness of the top surface of a stack body is very poor, obvious pits exist in the surface, gaps between the ton bags are very large, the gaps and the surfaces between the ton bags need to be filled with a large amount of clay, and a large amount of land resources are consumed.
(2) The large-scale hoisting crane is needed for hoisting operation in ton bag landfill operation, but the crane cannot be accurately placed in a landfill area, and the cooperative operation of labor personnel on a stack body is needed, so that the safety risk is high, a large amount of personnel, machinery and materials are needed to be input into a certain domestic fly ash landfill site to ensure the stability of the fly ash stack body, the field operation difficulty is increased, and the working efficiency is low.
(3) The ton bag is generally made of PE material, and is easy to degrade or decay after being filled for a long time. Along with the gradual stacking of the ton bags, once the PE ton bags reach the service life, a large number of the ton bags filled in the reservoir area are damaged, the ton bags are relied on to ensure that the formed fly ash of the fly ash solidified body is unstable, and the safety risk of stack collapse exists.
(4) Ton bag landfill is because the roughness is not high to when taking manual welding operation, HDPE membrane fold is more, and is inefficient, and whole tectorial membrane image is relatively poor, is unfavorable for clear water drainage guide.
Therefore, how to effectively overcome the defects in the existing fly ash landfill treatment process is to obtain a fly ash safe landfill method which has the advantages of simple process, convenient operation, low treatment cost, high treatment efficiency, good treatment working condition, low environmental risk and high safety factor, and has important significance for realizing the effective treatment of fly ash.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a safe fly ash landfill method which has the advantages of simple process, convenient operation, low treatment cost, high treatment efficiency, good treatment working condition, low environmental risk and high safety coefficient.
In order to solve the technical problems, the invention adopts the following technical scheme:
a safe landfill method of fly ash comprises the following steps:
s1, mixing the fly ash with a chelating agent to prepare a fly ash chelate;
s2, pouring the fly ash chelate obtained in the step S1 into a groove of a region to be buried in a landfill site;
s3, compacting the fly ash chelate poured in the groove in the step S2;
s4, curing the formed chelate obtained after compaction in the step S3 until a solidified body of the fly ash is formed.
In step S2, the groove is formed by two detachable templates extending to two sides of the region to be buried in the landfill site; or the groove is formed by a detachable template extending to two sides of the region to be buried in the landfill and a formed landfill body in the landfill.
In the above method for safely burying fly ash, in a further improvement, in step S2, the length of the groove is the same as the width of the landfill site; the width of the groove is 2 m-6 m, and the height is 2 m-4 m.
In step S2, the detachable form is a steel form made of steel.
In the above method for safely burying fly ash, in a further improvement, in step S1, the fly ash chelate is prepared by the following steps: mixing the fly ash and the chelating agent, adding the industrial wastewater, and stirring for 120-180 s to obtain the fly ash chelate.
In the method for safely burying the fly ash, in step S1, the dosage of the chelating agent is 2-4% of the mass of the fly ash.
In the above method for safely burying fly ash, a further improvement is that in step S1, the moisture content of the fly ash chelate is less than 30%.
In step S2, the fly ash chelate obtained in step S1 is transported to the groove of the area to be buried in the landfill site by a belt conveyor or a scraper conveyor.
In step S3, a rammer or a press is used to compact the fly ash chelate poured into the groove in step S2; the volume reduction rate of the fly ash chelate is controlled to be 25-35% in the compaction process.
In the method for safely burying the fly ash, a tamper is adopted to squeeze the fly ash chelate poured in the groove in the step S2, and the fly ash chelate is squeezed and tamped from top to bottom.
In the method for safely burying the fly ash, the fly ash chelate poured in the groove in the step S2 is pressed by a press machine, the pressure of the press machine is gradually increased, and the pressure of the press machine is controlled to be less than or equal to 110 KN.
Compared with the prior art, the invention has the advantages that:
the invention provides a safe flying ash landfill method, which is characterized in that flying ash is stirred by adopting a mode of mixing and stirring a chelating agent, industrial wastewater and flying ash, the forming time and the forming effect of a flying ash chelate can be ensured by controlling the adding amount and the stirring time of the chelating agent and the industrial wastewater, meanwhile, the water content of the flying ash chelate can be conveniently controlled by controlling the adding amount and the stirring time of the chelating agent and the industrial wastewater, stable water content data can be easily obtained, namely, the flying ash chelate with the water content of less than 30 percent can be obtained, the leaching of heavy metals in the flying ash chelate can be reduced, and the secondary pollution problem caused by the re-dissolution of the heavy metals can be avoided. Further, the fly ash chelate is conveyed to a landfill operation site (in a groove of a to-be-landfill area of a landfill) through a belt conveyor/scraper conveyor, so that the continuous conveying of the fly ash chelate can be realized, the site operation efficiency can be greatly improved, the use of labor personnel is reduced, and the operation risk of the site labor personnel is reduced (a large-scale crane and the labor personnel operate under a ton-bag crane); furthermore, the fly ash chelate is compacted in the groove of the area to be buried in the landfill, so that the integral forming of the fly ash chelate can be realized, which is favorable for greatly improving the stability of the fly ash landfill body, solving the defects that the prior fly ash solidified body ton bag landfill body is scattered, the gap in the landfill body is large, the ton bag is easy to generate uneven displacement, the stability of the landfill body after being buried is poor, and the like The appearance of the landfill body and the effect of rain and sewage diversion are poor. Therefore, the method for safely burying the fly ash can simplify the working procedures of the burying operation, improve the working efficiency, reduce the manual operation and reduce the operation risk of field operators, has the advantages of simple process, convenient operation, low treatment cost, high treatment efficiency, good treatment working condition, low environmental risk, high safety factor and the like, can realize the safe burying of the fly ash, has obvious advantages in the aspects of pile body safety, environmental safety and storage capacity saving, and has important significance for realizing the effective disposal of the fly ash.
Drawings
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Fig. 1 is a schematic plan view of a landfill site in embodiment 1 of the present invention.
FIG. 2 is a cross-sectional view of a groove in example 1 of the present invention.
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.
Example 1
A method for safely burying fly ash, which utilizes a pouring mode to convey fly ash chelate to a groove of a region to be buried in a landfill (a plan view of the landfill is shown in figure 1) so as to realize the integral molding of the fly ash chelate, and comprises the following steps:
s1, mixing fly ash (waste incineration fly ash) with a chelating agent (commercially available, the name of the chelating agent is AS-1) to prepare a fly ash chelate, which specifically comprises the following steps: mixing the fly ash and the chelating agent according to the dosage of the chelating agent accounting for 4 percent of the mass of the fly ash, adding industrial wastewater (the source of the wastewater is the flushing wastewater of a chelation workshop), and stirring for 180s to obtain the fly ash chelate with the water content of 27.9 percent. In the step, the preparation of the fly ash chelate is carried out near a to-be-landfill area of a landfill site, and the preparation is carried out on site, so that the operation efficiency is improved, the use of labor personnel is reduced, and the operation risk of the on-site labor personnel is reduced; meanwhile, the fly ash chelate is convenient to convey to a region to be buried in a landfill site.
And S2, conveying the fly ash chelate obtained in the step S1 to a to-be-buried area of the landfill by using a belt conveyor, and pouring the fly ash chelate into a groove of the to-be-buried area of the landfill. The fly ash chelate discharged from the stirrer is viscous, the fly ash chelate can be firstly filled into a ton bag for temporary bagging, then the bag is conveyed by a belt conveyor, and the fly ash chelate can also be directly transferred to a belt of the belt conveyor for conveying, namely the fly ash chelate can be conveyed by the belt conveyor. In the step, at the initial stage of landfill, the groove arranged in the area to be buried in the landfill site is composed of two detachable templates extending to two sides of the area to be buried in the landfill site, and at the later stage of landfill, the groove arranged in the area to be buried in the landfill site is composed of one detachable template extending to two sides of the area to be buried in the landfill site and a formed landfill body (fly ash solidified body) in the landfill site (as shown in fig. 2), wherein the length of the groove is the same as the width of the landfill site, the width is 2m, and the height is 2 m. In the step, the detachable template is a combined steel template formed by steel materials, the detachable template needs to be detachably fixed before pouring, and is detached after the fly ash chelate is converted into a stable fly ash solidified body, and the detachable template continues to be used for constructing the groove, so that cyclic utilization is realized, and the cost is reduced.
S3, compacting the fly ash chelate poured in the groove in the step S2, specifically: and mechanically extruding the fly ash chelate poured in the groove by adopting a press machine, and controlling the pressure to be 110KN until the volume reduction rate of the fly ash chelate reaches 28.6%.
S4, curing the formed chelate obtained after compaction in the step S3 until a fly ash solidified body is formed, and finishing safe landfill of fly ash.
In the embodiment of the invention, the fly ash is stirred by mixing and stirring the chelating agent, the industrial wastewater and the fly ash, the forming time and the forming effect of the fly ash chelate can be ensured by controlling the adding amount and the stirring time of the chelating agent and the industrial wastewater, meanwhile, the moisture content of the fly ash chelate can be conveniently controlled by controlling the adding amount and the stirring time of the chelating agent and the industrial wastewater, stable moisture content data can be easily obtained, namely the fly ash chelate with the moisture content of less than 30 percent, the leaching of heavy metals in the fly ash chelate can be reduced, and the secondary pollution problem caused by the re-dissolution of the heavy metals can be avoided. Further, the fly ash chelate is conveyed to a landfill operation site (in a groove of a to-be-landfill area of a landfill) through a belt conveyor/scraper conveyor, so that the continuous conveying of the fly ash chelate can be realized, the site operation efficiency can be greatly improved, the use of labor personnel is reduced, and the operation risk of the site labor personnel is reduced (a large-scale crane and the labor personnel operate under a ton-bag crane); furthermore, the fly ash chelate is compacted in the groove of the area to be buried in the landfill, so that the integral forming of the fly ash chelate can be realized, which is favorable for greatly improving the stability of the fly ash landfill body, solving the defects that the prior fly ash solidified body ton bag landfill body is scattered, the gap in the landfill body is large, the ton bag is easy to generate uneven displacement, the stability of the landfill body after being buried is poor, and the like The appearance of the landfill body and the effect of rain and sewage diversion are poor. Therefore, the method for safely burying the fly ash can simplify the working procedures of the burying operation, improve the working efficiency, reduce the manual operation and reduce the operation risk of field operators, has the advantages of simple process, convenient operation, low treatment cost, high treatment efficiency, good treatment working condition, low environmental risk, high safety factor and the like, can realize the safe burying of the fly ash, has obvious advantages in the aspects of pile body safety, environmental safety and storage capacity saving, and has important significance for realizing the effective disposal of the fly ash.
Example 2
A method for safely burying fly ash, which utilizes a pouring mode to convey fly ash chelate to a groove of a region to be buried in a landfill site so as to realize the integral molding of the fly ash chelate, comprises the following steps:
s1, mixing fly ash (waste incineration fly ash) with a chelating agent (commercially available, the name of the chelating agent is AS-1) to prepare a fly ash chelate, which specifically comprises the following steps: mixing the fly ash and the chelating agent according to the dosage of the chelating agent accounting for 4 percent of the mass of the fly ash, adding industrial wastewater (the source of the wastewater is the flushing wastewater of a chelation workshop), and stirring for 180s to obtain the fly ash chelate with the water content of 28.7 percent. In the step, the preparation of the fly ash chelate is carried out near a to-be-landfill area of a landfill site, and the preparation is carried out on site, so that the operation efficiency is improved, the use of labor personnel is reduced, and the operation risk of the on-site labor personnel is reduced; meanwhile, the fly ash chelate is convenient to convey to a region to be buried in a landfill site.
And S2, conveying the fly ash chelate obtained in the step S1 to a to-be-buried area of the landfill by adopting a scraper conveyor, and pouring the fly ash chelate into a groove of the to-be-buried area of the landfill. The fly ash chelate discharged from the stirrer is viscous, the fly ash chelate can be firstly filled into a ton bag for temporary bagging, then the fly ash chelate is conveyed by using a scraper conveyor, or the fly ash chelate can be directly transferred into a material tank of the scraper conveyor for conveying, namely the fly ash chelate can be conveyed by using the scraper conveyor. In the step, at the initial stage of landfill, the groove arranged in the area to be buried of the landfill site is composed of two detachable templates extending to two sides of the area to be buried of the landfill site, and at the later stage of landfill, the groove arranged in the area to be buried of the landfill site is composed of one detachable template extending to two sides of the area to be buried of the landfill site and a formed landfill body (fly ash solidified body) in the landfill site, wherein the length of the groove is the same as the width of the landfill site, the width is 3m, and the height is 2 m. In the step, the detachable template is a combined steel template formed by steel materials, the detachable template needs to be detachably fixed before pouring, and is detached after the fly ash chelate is converted into a stable fly ash solidified body, and the detachable template continues to be used for constructing the groove, so that cyclic utilization is realized, and the cost is reduced.
S3, compacting the fly ash chelate poured in the groove in the step S2, specifically: and mechanically extruding the fly ash chelate poured in the groove by using a compactor, and compacting once from top to bottom until the volume reduction rate of the fly ash chelate reaches 34.0%.
S4, curing the formed chelate obtained after compaction in the step S3 until a fly ash solidified body is formed, and finishing safe landfill of fly ash.
Example 3
The toxic leaching of fly ash chelates with different water contents was examined, as shown in table 1.
TABLE 1 toxicity leaching of fly ash chelates in different water contents
| Water content (%) | 27.9 | 28.7 | 27.6 | Correlation criteria |
| pH | 11.87 | 11.78 | 11.70 | / |
| Total beryllium (mg/L) | 0.00004 | 0.00005 | 0.0004 | 0.02 |
| Total chromium (mg/L) | 0.0507 | 0.0528 | 0.534 | 4.5 |
| Hexavalent chromium (mg/L) | ND | 0.006 | 0.007 | 1.5 |
| Total nickel (mg/L) | 0.407 | 0.402 | 0.389 | 0.5 |
| Total copper (mg/L) | 0.0400 | 0.0399 | 0.0417 | 40 |
| Total zinc (mg/L) | 0.080 | 0.065 | 0.047 | 100 |
| Total arsenic (mg/L) | 0.094 | 0.097 | 0.096 | 0.3 |
| Total selenium (mg/L) | 0.009 | 0.007 | 0.010 | 0.1 |
| Total cadmium (mg/L) | 0.0009 | 0.0010 | 0.0009 | 0.15 |
| Total barium (mg/L) | 4.82 | 5.01 | 4.39 | 25 |
| Total mercury (mg/L) | 0.009 | 0.0010 | 0.0008 | 0.05 |
| Total lead (mg/L) | 0.178 | 0.099 | 0.198 | 0.25 |
In table 1, fly ash chelates having different water contents were prepared in the same manner as in example 1, except that the water contents were different. As can be seen from Table 1, the leaching concentration of each heavy metal in the fly ash chelate prepared by the method meets the relevant landfill requirements, and the fly ash chelate can be subjected to landfill treatment.
The above examples are merely preferred embodiments of the present invention, and the scope of the present invention is not limited to the above examples. All technical schemes belonging to the idea of the invention belong to the protection scope of the invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention, and such modifications and embellishments should also be considered as within the scope of the invention.
Claims (10)
1. A safe fly ash landfill method is characterized by comprising the following steps:
s1, mixing the fly ash with a chelating agent to prepare a fly ash chelate;
s2, pouring the fly ash chelate obtained in the step S1 into a groove of a region to be buried in a landfill site;
s3, compacting the fly ash chelate poured in the groove in the step S2;
s4, curing the formed chelate obtained after compaction in the step S3 until a solidified body of the fly ash is formed.
2. A method for safe landfill of fly ash according to claim 1, wherein, in step S2, the grooves are formed by two detachable templates extending to both sides of the area to be buried in the landfill site; or the groove is formed by a detachable template extending to two sides of the region to be buried in the landfill and a formed landfill body in the landfill.
3. A method for safe landfill of fly ash according to claim 2, wherein in step S2, the length of the groove is the same as the width of the landfill site; the width of the groove is 2 m-6 m, and the height is 2 m-4 m.
4. A method for safe landfill of fly ash according to claim 2, wherein in step S2, the detachable form is a fabricated steel form made of steel material.
5. A method for safe landfill of fly ash according to any one of claims 1 to 4, wherein in step S1, the fly ash chelate is prepared by the following method: mixing the fly ash and the chelating agent, adding the industrial wastewater, and stirring for 120-180 s to obtain the fly ash chelate.
6. A method for safe landfill of fly ash according to claim 5, wherein in step S1, the chelating agent is used in an amount of 2% to 4% by mass of the fly ash.
7. A method for safe landfill of fly ash according to claim 5, wherein the moisture content of the fly ash chelate complex is < 30% in step S1.
8. A method for safe landfill of fly ash according to any one of claims 1 to 4, wherein in step S2, the fly ash chelate obtained in step S1 is transported to a groove of a landfill site area to be buried by using a belt conveyor or a scraper conveyor.
9. A method for safely burying fly ash according to any one of claims 1 to 4, wherein in step S3, the fly ash chelate compound poured in the groove in step S2 is compacted by a compactor or a press; the volume reduction rate of the fly ash chelate is controlled to be 25-35% in the compaction process.
10. The method for safe landfill of fly ash according to claim 9, wherein the fly ash chelate compound poured in the groove in step S2 is compacted by a compactor from top to bottom;
or, when the fly ash chelate poured in the groove in the step S2 is pressed by a press machine, the pressure of the press machine is gradually increased, and the pressure of the press machine is controlled to be less than or equal to 110 KN.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114956379A (en) * | 2022-05-30 | 2022-08-30 | 南京理工大学 | Method for realizing fixation of arsenic in liquid by utilizing fly ash to form safe landfill |
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