CN215781179U - Fixed stabilization treatment system for combustion fly ash - Google Patents
Fixed stabilization treatment system for combustion fly ash Download PDFInfo
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- CN215781179U CN215781179U CN202122175117.1U CN202122175117U CN215781179U CN 215781179 U CN215781179 U CN 215781179U CN 202122175117 U CN202122175117 U CN 202122175117U CN 215781179 U CN215781179 U CN 215781179U
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- chelating agent
- fly ash
- liquid medicine
- feeding
- storage bin
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- 239000010881 fly ash Substances 0.000 title claims abstract description 54
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 15
- 230000006641 stabilisation Effects 0.000 title claims description 9
- 238000011105 stabilization Methods 0.000 title claims description 9
- 239000002738 chelating agent Substances 0.000 claims abstract description 72
- 238000003860 storage Methods 0.000 claims abstract description 66
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 59
- 239000003814 drug Substances 0.000 claims abstract description 48
- 239000007788 liquid Substances 0.000 claims abstract description 47
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 21
- 239000004568 cement Substances 0.000 claims abstract description 19
- 239000007787 solid Substances 0.000 claims description 15
- 239000000149 chemical water pollutant Substances 0.000 claims description 10
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 14
- 150000002500 ions Chemical class 0.000 abstract description 11
- 230000009471 action Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000000126 substance Substances 0.000 description 6
- 239000012141 concentrate Substances 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000004056 waste incineration Methods 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 230000009920 chelation Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 239000004021 humic acid Substances 0.000 description 1
- 230000003100 immobilizing effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Abstract
The utility model discloses a combustion fly ash fixing and stabilizing treatment system, which comprises a stabilizing system, a chelating agent system and a water supply system, wherein the stabilizing system comprises a fly ash storage bin, a cement storage bin, a premixing device and a mixing device, the chelating agent system comprises a chelating agent batching system and a feeding system, the feeding system comprises a liquid medicine storage tank, a garbage leachate storage bin and a feeding pipeline, the garbage leachate storage bin is connected with the liquid medicine storage tank through a first pipeline, a medicine outlet of the liquid medicine storage tank is connected with the mixing device through the feeding pipeline, the chelating agent batching system is connected with the liquid medicine storage tank in the feeding system, and the chelating agent batching system comprises a chelating agent batching tank and a chelating agent storage bin. The prepared liquid chelating agent is mixed with the percolate concentrated solution through a chelating agent system, and the percolate concentrated solution and the chelating agent react to fix the heavy metal ions in the fly ash under the combined action, so that the use amount of the chelating agent is reduced, and the reutilization treatment of the percolate concentrated solution is realized.
Description
Technical Field
The utility model belongs to the technical field of garbage treatment, and particularly relates to a combustion fly ash fixing and stabilizing treatment system.
Background
With the popularization of the household garbage incineration power generation technology in the treatment of household garbage in China cities, the treatment and disposal of fly ash generated by garbage incineration become one of the important problems which puzzle people in production and life.
The national hazardous waste record (2016) (hereinafter "record of names") released by the ministry of environmental protection in association with the national development and reform committee and the ministry of public security was filed from 2016 (8.1.8.1). The fly ash is selected from the famous records and listed in the dangerous waste exempted management list of the famous records, and the exempted condition is to treat the fly ash, so that the fly ash can reasonably enter a domestic garbage site for landfill treatment after reaching the standard, and market space is opened for chelation treatment of the fly ash.
The amount of fly ash produced is related to the type of refuse, incineration conditions, type of incinerator and flue gas treatment process, and generally accounts for 3% -5% of the amount of refuse incineration. Analysis shows that: the waste incineration fly ash is not a chemical inert substance, and contains various harmful heavy metal substances and salts such as Cd, Pb, Zn, Cr and the like with high content and capable of being leached by water, and if the waste incineration fly ash is not properly treated, heavy metal migration can be caused, so that underground water, soil and air are polluted.
The typical practice of the present fly ash stabilization treatment is: the dry fly ash and the chelating agent are mixed according to a certain proportion, and then are uniformly stirred to prepare a stable solid matrix, and then the stable solid matrix can be stored or buried, and insoluble, stable and low-toxicity substances are generated through the reaction of the chelating agent and easily-percolated heavy metals in the waste incineration fly ash, and because the production amount of the fly ash is about 5 percent of the waste amount, the chelating agent used for stabilizing the fly ash is large in amount, and the cost is high.
In addition, in order to meet the national relevant regulations, the water content of the treated fly ash needs to be lower than 30%, so that the addition amount of the liquid chelating agent needs to be controlled in the stabilizing treatment process, or the sticky solid matrix needs to be dried in the later period. The addition of water in the stabilization process therefore needs to be strictly controlled.
The landfill leachate is high-concentration organic wastewater which is formed by deducting the saturated water holding capacity of garbage and a soil covering layer from water contained in the garbage in a garbage landfill, rain, snow and water entering the landfill and other water and passing through the garbage layer and the soil covering layer. The landfill leachate is very complex high-concentration organic sewage, has complex composition and high content of organic matters and ammonia nitrogen. The heavy metal ion content is high, and the heavy metal ion mainly comprises more than ten heavy metal ions such as Fe, Zn, Cd, Cr, Hg, Mn, Pb, Ni and the like. At present, the landfill leachate is treated by a combined treatment process of biochemistry, tubular ultrafiltration and nanofiltration/reverse osmosis, the leachate treated by the process can generate 20-30% of concentrated solution which contains a large amount of sulfide, humic acid, phosphate and other substances, and the substances can perform a complex reaction with heavy metal ions under the action of a stable catalyst to form a stable complex. At present, the concentrate is generally subjected to landfill site reverse irrigation, and the water content of 20-30% of percolate concentrate is still large, so that the concentrate needs to be reasonably recycled.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, it is an object of the present invention to provide a system for immobilizing and stabilizing combustion fly ash, which utilizes the interaction between the percolate concentrate and chelating agent to react with heavy metal ions in the fly ash to immobilize the heavy metal ions, thereby reducing the usage amount of chelating agent and realizing the reuse of the percolate concentrate.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
a combustion fly ash fixing and stabilizing treatment system comprises a stabilizing system, a chelating agent system and a water supply system, the stabilizing system comprises a fly ash storage bin, a cement storage bin, a premixing device and a mixing device, the chelating agent system comprises a chelating agent batching system and a feeding system, the feeding system comprises a liquid medicine storage tank, a garbage leachate storage bin and a feeding pipeline, the garbage leachate storage bin is connected with the liquid medicine storage tank through a first pipeline, the drug outlet of the liquid medicine storage tank is connected with the mixing device through the feeding pipeline, the chelating agent batching system is connected with the liquid medicine storage tank in the feeding system, chelating agent feed proportioning system includes chelating agent batching jar and chelating agent storage storehouse, water supply system include water supply pipe and respectively with the water supply branch pipe that chelating agent batching jar, liquid medicine storage jar, mixing device are connected.
Furthermore, outlets at the bottoms of the fly ash storage bin and the cement storage bin are respectively connected with the premixing device, a discharge port of the premixing device is communicated with a feed port of the mixing device, and a first weight sensor and a second weight sensor are respectively arranged below the outlets of the fly ash storage bin and the cement storage bin.
Further, a humidity sensor is provided inside the kneading apparatus.
Furthermore, concentration sensors are respectively arranged in the chelating agent batching tank and the liquid medicine storage tank, a third weight sensor is arranged at an outlet at the bottom of the chelating agent batching tank, a first flow meter is arranged on the first pipeline, and the concentration sensor, the third weight sensor and the first flow meter are respectively connected with the PLC.
Furthermore, an electromagnetic valve and a flowmeter are arranged on the water supply branch pipes.
Furthermore, a liquid medicine feeding hopper, a solid feeding hopper and a water inlet are respectively arranged at the top of the mixing device, one end of the feeding pipeline is connected with the liquid medicine feeding hopper, a discharge port of the premixing device is connected with the solid feeding hopper, and one end of the water supply branch pipe is connected with the water inlet.
Further, the landfill leachate storage bin stores the concentrated solution after the landfill leachate treatment.
Compared with the prior art, the utility model has the following advantages:
(1) the utility model is provided with a stabilizing system, a chelating agent system and a water supply system, the configured liquid chelating agent is mixed with the percolate concentrated solution through the chelating agent system, and the percolate concentrated solution and the chelating agent are utilized to react with heavy metal ions in the fly ash to fix the heavy metal ions, so that the use amount of the chelating agent is reduced, and the reutilization treatment of the percolate concentrated solution is realized.
(2) The water supply system is arranged in the device and comprises a water supply branch pipe connected with the chelating agent dosing tank, the liquid medicine storage tank and the mixing device, the water inflow is controlled through a flow meter, the medicine concentration in the chelating agent dosing tank and the liquid medicine storage tank is controlled, the water content in the mixing device is further controlled, and the water addition in the stabilizing process is strictly controlled.
(3) In the stabilization system, the solid fly ash and the cement are pre-mixed by the pre-mixing device, so that the problem of direct and uneven mixing of the fly ash and the cement caused by the agglomeration of water added into the cement is avoided, and the qualification rate of the treated fly ash is improved.
Drawings
FIG. 1 is a schematic structural view of a combustion fly ash stabilization treatment system according to the present invention;
FIG. 2 is a schematic diagram of the structure of the chelator system of the present invention;
FIG. 3 is a schematic diagram of a control structure in the chelant system of the present invention.
The device comprises a fly ash storage bin 1, a cement storage bin 2, a premixing device 3, a mixing device 4, a chelating agent batching system 5, a feeding system 6, a liquid medicine storage tank 7, a landfill leachate storage bin 8, a feeding pipeline 9, a chelating agent batching tank 10, a chelating agent storage bin 11, a water supply pipeline 12, a water supply branch pipe 13, a first weight sensor 14, a second weight sensor 15, a humidity sensor 16, a concentration sensor 17, a third weight sensor 18, a first flow meter 19, a PLC (programmable logic controller) 20, an electromagnetic valve 21, a flow meter 22, a first pipeline 101, a liquid medicine feeding hopper 401, a solid feeding hopper 402 and a water inlet 403.
Detailed Description
The following detailed description of embodiments of the utility model refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
As shown in fig. 1-3, a combustion fly ash fixing and stabilizing treatment system comprises a stabilizing system, a chelating agent system and a water supply system, wherein the stabilizing system comprises a fly ash storage bin 1, a cement storage bin 2, a premixing device 3 and a mixing device 4, the chelating agent system comprises a chelating agent batching system 5 and a feeding system 6, the feeding system 6 comprises a liquid medicine storage tank 7, a garbage leachate storage bin 8 and a feeding pipeline 9, the garbage leachate storage bin 8 is connected with the liquid medicine storage tank 7 through a first pipeline 101, a medicine outlet of the liquid medicine storage tank 7 is connected with the mixing device 4 through the feeding pipeline 9, the chelating agent batching system 5 is connected with the liquid medicine storage tank 7 in the feeding system 6, the chelating agent batching system 5 comprises a chelating agent batching tank 10 and a chelating agent storage bin 11, the water supply system comprises a water supply pipeline 12 and a water supply pipe, a chelating agent batching tank 10, a water supply pipe, a mixing pipe and a mixing pipe 10, A liquid medicine storage tank 7 and a water supply branch pipe 13 connected with the mixing device 4.
According to the utility model, a stabilizing system, a chelating agent system and a water supply system are arranged, chelating agent raw materials and water are put into a chelating agent batching tank 10 through a water supply branch pipe 13 and a chelating agent storage bin 11 to complete the configuration of a liquid chelating agent, then the liquid chelating agent in the chelating agent batching tank 10 is conveyed to a liquid medicine storage tank 7 in a feeding system, concentrated solution of garbage percolate is input into the liquid medicine storage tank 7, and meanwhile, the concentration of medicine in the liquid medicine storage tank 7 is regulated again through the water supply branch pipe 13 according to requirements to obtain liquid medicine with a certain concentration requirement, so that the concentration of the liquid medicine can meet the ratio of effective components in the liquid medicine to the quality of fly ash, excessive water in a mixing device can not be caused, and the water quantity in the fly ash stabilizing process can be strictly controlled.
According to the utility model, the configured liquid chelating agent is mixed with the percolate concentrated solution through the chelating agent system, and the percolate concentrated solution and the chelating agent react with heavy metal ions in the fly ash to fix the heavy metal ions by utilizing the combined action of the percolate concentrated solution and the chelating agent, so that the use amount of the chelating agent is reduced, and the reutilization treatment of the percolate concentrated solution is realized.
In the stabilization system, the solid fly ash and the cement are pre-mixed by the pre-mixing device 3, so that the problem of direct and uneven mixing of the fly ash and the cement caused by the agglomeration of water added into the cement is avoided, and the qualification rate of the treated fly ash is improved.
As shown in fig. 1, in the technical solution of the present invention:
the bottom outlets of the fly ash storage bin 1 and the cement storage bin 2 are respectively connected with the premixing device 3, the discharge port of the premixing device 3 is communicated with the feed port of the mixing device 4, and a first weight sensor 14 and a second weight sensor 15 are respectively arranged below the outlets of the fly ash storage bin 1 and the cement storage bin 2.
The first weight sensor 14 and the second weight sensor 15 are arranged to control the quantitative addition of the fly ash and the cement, so that the fly ash and the cement can be premixed according to a required proportion, and the weight of the solid powdery material entering the mixing device 4 is strictly controlled, so that the solid powdery material and the liquid medicine can be mixed and stabilized in the mixing device 4 according to a proportion.
As shown in fig. 1, in the technical solution of the present invention:
a humidity sensor 16 is provided inside the kneading apparatus 4.
The humidity sensor 16 is used for controlling the moisture content in the mixing device 4 in real time, so that the moisture content is prevented from being too high while the moisture is stabilized and fixed (viscous solid or agglomerated particles are formed).
As shown in fig. 2 and 3, in the technical solution of the present invention:
As shown in fig. 3, in the technical solution of the present invention:
the water supply branch pipes 13 are provided with electromagnetic valves 21 and flow meters 22.
The device is provided with a water supply system which comprises a water supply branch pipe 13 connected with a chelating agent batching tank 10, a liquid medicine storage tank 7 and a mixing device 4, wherein the water inflow is controlled through a flow meter arranged on the water supply branch pipe 13, the medicine concentration inside the chelating agent batching tank 10 and the liquid medicine storage tank 7 is controlled, the water content in the mixing device is further controlled, and the water addition in the stabilizing process is strictly controlled.
As shown in fig. 1, in the technical solution of the present invention:
a liquid medicine feeding hopper 401, a solid feeding hopper 402 and a water inlet 403 are respectively arranged at the top of the mixing device 4, one end of the feeding pipeline 9 is connected with the liquid medicine feeding hopper 401, the discharge port of the premixing device 3 is connected with the solid feeding hopper 402, and one end of the water supply branch pipe 13 is connected with the water inlet 403.
In the technical scheme of the utility model:
the landfill leachate storage bin 8 stores the concentrated solution after the landfill leachate treatment.
The foregoing shows and describes the general principles, essential features, and advantages of the utility model. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the utility model, but that various changes and modifications may be made without departing from the spirit and scope of the utility model, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (7)
1. A combustion fly ash fixing and stabilizing treatment system comprises a stabilizing system, a chelating agent system and a water supply system, and is characterized in that the stabilizing system comprises a fly ash storage bin (1), a cement storage bin (2), a premixing device (3) and a mixing device (4), the chelating agent system comprises a chelating agent batching system (5) and a feeding system (6), the feeding system (6) comprises a liquid medicine storage tank (7), a garbage leachate storage bin (8) and a feeding pipeline (9), the garbage leachate storage bin (8) is connected with the liquid medicine storage tank (7) through a first pipeline (101), a medicine outlet of the liquid medicine storage tank (7) is connected with the mixing device (4) through the feeding pipeline (9), the chelating agent batching system (5) is connected with the liquid medicine storage tank (7) in the feeding system (6), chelating agent feed proportioning system (5) include chelating agent batching jar (10) and chelating agent storage storehouse (11), water supply system include water supply pipe (12) and respectively with chelating agent batching jar (10), liquid medicine storage jar (7), water supply branch pipe (13) that mixing device (4) are connected.
2. The system for the fixed and stable treatment of the combustion fly ash according to claim 1, wherein the outlets at the bottom of the fly ash silo (1) and the cement silo (2) are respectively connected with the premixing device (3), the discharge port of the premixing device (3) is communicated with the feed port of the mixing device (4), and a first weight sensor (14) and a second weight sensor (15) are respectively arranged below the outlets of the fly ash silo (1) and the cement silo (2).
3. The system for the fixed and stabilized treatment of combustion fly ash according to claim 1, characterized in that a humidity sensor (16) is provided inside the mixing device (4).
4. The combustion fly ash fixation and stabilization treatment system according to claim 1, wherein concentration sensors (17) are respectively arranged in the chelating agent dosing tank (10) and the liquid medicine storage tank (7), a third weight sensor (18) is arranged at a bottom outlet of the chelating agent dosing tank (10), a first flow meter (19) is arranged on the first pipeline (101), and the concentration sensors (17), the third weight sensor (18) and the first flow meter (19) are respectively connected with a PLC (programmable logic controller) controller (20).
5. The system for the fixed and stable treatment of the combustion fly ash according to claim 1, wherein the water supply branch pipes (13) are provided with electromagnetic valves (21) and flow meters (22).
6. The system for the fixed and stable treatment of the combustion fly ash according to claim 1, wherein a liquid medicine feeding hopper (401), a solid feeding hopper (402) and a water inlet (403) are respectively arranged at the top of the mixing device (4), one end of the feeding pipeline (9) is connected with the liquid medicine feeding hopper (401), the discharge port of the premixing device (3) is connected with the solid feeding hopper (402), and one end of the water supply branch pipe (13) is connected with the water inlet (403).
7. The combustion fly ash fixation and stabilization treatment system according to claim 1, wherein the landfill leachate storage bin (8) stores the treated concentrated solution of landfill leachate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122175117.1U CN215781179U (en) | 2021-09-09 | 2021-09-09 | Fixed stabilization treatment system for combustion fly ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122175117.1U CN215781179U (en) | 2021-09-09 | 2021-09-09 | Fixed stabilization treatment system for combustion fly ash |
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| Publication Number | Publication Date |
|---|---|
| CN215781179U true CN215781179U (en) | 2022-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122175117.1U Active CN215781179U (en) | 2021-09-09 | 2021-09-09 | Fixed stabilization treatment system for combustion fly ash |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115120924A (en) * | 2022-06-28 | 2022-09-30 | 重庆新离子环境科技有限公司 | Intelligent preparation system for household garbage incineration fly ash chelating agent |
-
2021
- 2021-09-09 CN CN202122175117.1U patent/CN215781179U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115120924A (en) * | 2022-06-28 | 2022-09-30 | 重庆新离子环境科技有限公司 | Intelligent preparation system for household garbage incineration fly ash chelating agent |
| CN115120924B (en) * | 2022-06-28 | 2023-11-10 | 重庆新离子环境科技有限公司 | Intelligent preparation system for household garbage incineration fly ash chelating agent |
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| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A fixed and stable treatment system for combustion fly ash Granted publication date: 20220211 Pledgee: Tongling Rural Commercial Bank Co.,Ltd. Jianshe Road Sub branch Pledgor: Tongling Shengze Environmental Protection Technology Co.,Ltd. Registration number: Y2024980013571 |