CN115040970A - Treatment method for green recycling of fly ash - Google Patents
Treatment method for green recycling of fly ash Download PDFInfo
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- CN115040970A CN115040970A CN202210844734.2A CN202210844734A CN115040970A CN 115040970 A CN115040970 A CN 115040970A CN 202210844734 A CN202210844734 A CN 202210844734A CN 115040970 A CN115040970 A CN 115040970A
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- B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/005—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by heat treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/007—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by irradiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/38—Removing components of undefined structure
- B01D53/40—Acidic components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/64—Heavy metals or compounds thereof, e.g. mercury
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/108—Halogens or halogen compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/306—Alkali metal compounds of potassium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/50—Inorganic acids
- B01D2251/502—Hydrochloric acid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/608—Sulfates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/61—Phosphates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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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
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a treatment method for green recycling of fly ash, which comprises the following steps: removing large particle impurities in the fly ash, and settling and removing the impurities; performing deacidification operation on the fly ash and leaching metals; introducing the fly ash treatment waste gas into a purification chamber for purification treatment; and detecting the purified fly ash waste gas to reach the discharge standard. The treatment method for green recycling of the fly ash adopts a stirring mode to mix when in deacidification and metal leaching, the stirred solution is more uniform and has high mixing degree with the fly ash, the metal leaching rate in the fly ash can also be improved, the cost of recycling the fly ash is further reduced, a deodorizing and sterilizing process is arranged, the fly ash waste gas is discharged after adsorption treatment, the environmental friendliness is improved, the absorption performance is good, the removal rate of malodorous gas is high, the recycling and discharge of the fly ash waste gas are realized, and the influence of the fly ash waste gas on the environment can be greatly reduced.
Description
Technical Field
The invention belongs to the technical field of chemical fly ash recovery, and particularly relates to a treatment method for green recovery and utilization of fly ash.
Background
Along with the social development, people are continuously concentrated in cities, the components of domestic garbage are increasingly complex, land resources are unprecedented and tense, the treatment of the domestic garbage becomes more important, the existing urban domestic garbage treatment mode is that the garbage is generally transported to an incineration plant for incineration, heat generated by the incineration of the garbage can be used for producing domestic energy, solid matters generated by the incineration comprise slag and fly ash, the slag is often used as a paving material, and the fly ash is mixed with toxic and harmful substances such as dioxin, sulfide, heavy metal and the like, the treatment method mainly comprises the technologies of cement solidification, chemical agent stabilization, melting solidification and the like, the chemical agent stabilization treatment still needs to be carried out for landfill, and the fly ash obtained by the landfill treatment through mass solidification can cause the loss and waste of land resources, thereby limiting the development of economy of each area and still causing certain pollution to the environment.
Disclosure of Invention
The invention aims to provide a treatment method for green recycling of fly ash, which can effectively solve the problems in the prior art.
In order to achieve the above purpose, the solution of the invention is:
a treatment method for green recycling of fly ash comprises the following steps:
s1, removing large-particle impurities in the fly ash, and settling and removing the impurities;
step S2, performing deacidification operation on the fly ash and leaching metals;
step S3, introducing the fly ash treatment waste gas into a purification chamber for purification treatment;
and step S4, detecting the purified fly ash waste gas to reach the emission standard.
The step S1 further includes introducing the fly ash into a cyclone dust removal device, settling and removing impurities in the fly ash, introducing the fly ash into the industrial wastewater, mixing the fly ash and the industrial wastewater cooperatively, and treating the subsequent wastewater and the exhaust gas respectively.
The step S2 further includes that the treated fly ash flue gas is introduced into the precursor treatment liquid for deacidification, and then the deacidified fly ash flue gas is conveyed to the heavy metal chelating solution to leach out aluminum ions in the fly ash flue gas, capture heavy metals in the fly ash and reduce the activity of the heavy metals.
The precursor treatment solution is prepared from potassium hypochlorite and potassium chlorite, wherein the weight percentage of the potassium hypochlorite: potassium chlorite =1:0.5, and the precursor treatment solution needs to be mixed with water for use, the ratio of the precursor treatment solution to the water is 1:1, and the heavy metal chelating solution is prepared from HCL, sodium phosphate and aluminum sulfate according to the ratio of 1:0.8: 0.9.
Mixing is needed when the fly ash is deacidified and the metals are leached, the stirring speed of a mixing device during deacidification is 120 revolutions per minute, the stirring is carried out at normal temperature for 8-10 minutes, the stirring speed during metal leaching is consistent with that during fly ash deacidification, the temperature is kept between 40-50 ℃, and the stirring time is adjusted according to the actual leaching effect.
The step S3 further includes adsorbing odor by activated carbon filler in the clean room, performing preliminary odor removal, performing deep odor removal by UV photolysis, and heating and sterilizing by high-temperature steam.
The surface layer of the active carbon filling material is sprayed with acetic acid liquid phase solution to absorb residual organic amine in the waste gas and assist in absorbing peculiar smell of the waste gas.
After the scheme is adopted, compared with the prior art, the invention has the technical progress that:
(1) the invention provides a treatment method for green recycling of fly ash, which treats waste with waste, reduces the reaction temperature of the fly ash by synergistic mixing of industrial wastewater and the fly ash, removes large-particle-size impurities in the fly ash, improves the recycling degree of subsequent fly ash, recycles the impurities in the fly ash in different utilization directions, reduces the landfill rate in the later period, and can be used for other engineering or industrial purposes after the recycling of the recycled fly ash impurities, thereby further increasing the recycling benefit of the fly ash.
(2) The invention provides a treatment method for green recycling of fly ash, which is characterized in that during deacidification and metal leaching, a stirring mode is adopted for mixing, a stirred solution is uniform, the mixing degree with the fly ash is high, the metal leaching rate in the fly ash can be increased, and the recycling cost of the fly ash is reduced.
(3) The invention provides a treatment method for green recycling of fly ash, which is provided with a process of deodorization and sterilization, and discharges fly ash waste gas after adsorption treatment, so that the environmental friendliness is improved, the absorption performance is good, the removal rate of malodorous gas is high, the reutilization and discharge of the fly ash waste gas are realized, and the influence of the fly ash waste gas on the environment can be greatly reduced.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The technical solution and the advantages of the present invention will be described in detail with reference to the accompanying drawings.
As shown in FIG. 1, the invention provides a treatment method for green recycling of fly ash, which comprises the following steps:
s1, removing large particle impurities in the fly ash, settling and removing the impurities, introducing the fly ash into a cyclone dust removal device, settling and removing the impurities in the fly ash, introducing the fly ash into industrial wastewater, mixing the fly ash and the industrial wastewater cooperatively, treating the subsequent wastewater and the exhaust gas respectively, and paying attention to high-temperature fly ash smoke to ensure that the steam evaporated by the industrial wastewater is treated in a sealed and liquefied manner so as to avoid leakage;
s2, performing deacidification operation on the fly ash and leaching metals, leading the treated fly ash flue gas into a precursor treatment liquid for deacidification, conveying the deacidified fly ash flue gas into a heavy metal chelating solution, leaching aluminum ions in the fly ash flue gas, capturing heavy metals in the fly ash, and reducing the activity of the heavy metals;
s3, introducing the waste gas after fly ash treatment into a purification chamber, performing purification treatment, performing odor adsorption by using activated carbon filler in the purification chamber, performing preliminary odor removal, performing deep odor removal by matching with UV photolysis odor removal, performing heating disinfection by matching with high-temperature steam, spraying acetic acid liquid phase solution on the surface layer of the activated carbon filler, absorbing residual organic amine in the waste gas, assisting in absorbing the peculiar smell of the waste gas, and after disinfection, cooling and conveying the purified gas for detection;
and S4, detecting the purified fly ash waste gas to reach the emission standard.
Further, the precursor treatment solution is prepared from potassium hypochlorite and potassium chlorite, wherein the weight ratio of potassium hypochlorite: potassium chlorite =1:0.5, and the precursor treatment liquid needs to be mixed with water for use, the proportion of the precursor treatment liquid to the water is 1:1, the heavy metal chelating solution is prepared from HCL, sodium phosphate and aluminum sulfate according to the proportion of 1:0.8:0.9, the fly ash needs to be mixed during deacidification and metal leaching, the stirring speed of the mixing equipment during deacidification is 120 revolutions per minute, the stirring is carried out at normal temperature for 8-10 minutes, the stirring speed during metal leaching is consistent with that during fly ash deacidification, the temperature is kept between 40 ℃ and 50 ℃, the stirring time is adjusted according to the actual leaching effect, the stirred solution is relatively uniform, the mixing degree with the fly ash is high, and the metal leaching rate in the fly ash can be improved.
The working principle of the treatment method for green recycling of fly ash is described in detail below.
As shown in figure 1, firstly, fly ash is introduced into a cyclone dust removal device to settle and remove impurities in the fly ash, then the fly ash is introduced into industrial wastewater, the fly ash and the industrial wastewater are mixed together to cool the fly ash, the subsequent wastewater and the exhaust gas are treated respectively, but attention needs to be paid to the high-temperature fly ash smoke to ensure that the steam evaporated by the industrial wastewater is sealed and liquefied to avoid leakage, then the treated fly ash smoke is firstly introduced into a precursor treatment liquid prepared from potassium hypochlorite and potassium chlorite to carry out deacidification treatment, the mixing is carried out by using mixing equipment during the deacidification, the stirring speed of the mixing equipment is 120 r/min, the mixing is carried out at normal temperature to carry out reaction for 8-10 min, then the deacidified fly ash smoke is conveyed into a heavy metal chelating solution prepared from HCL, sodium phosphate and aluminum sulfate according to the proportion of 1:0.8:0.9, the method comprises the steps of carrying out reaction under the conditions that the stirring speed is 100-120 revolutions per minute and the temperature is kept between 40 ℃ and 50 ℃, adjusting the stirring time according to the actual leaching effect, leaching aluminum ions in fly ash smoke, trapping heavy metals in fly ash, reducing the activity of the heavy metals, guiding fly ash treatment waste gas into a purification chamber, carrying out purification treatment, adsorbing peculiar smell by using an active carbon filler in the purification chamber, carrying out preliminary smell removal, carrying out deep smell removal by matching with UV photolysis smell removal, carrying out heating disinfection by matching with high-temperature steam, spraying acetic acid liquid-phase solution on the surface layer of the active carbon filler, absorbing residual organic amine in the waste gas, assisting in absorbing the peculiar smell of the waste gas, carrying out temperature reduction and detection on the purified gas after the disinfection is finished, and discharging the purified gas after the detection is finished, wherein the standard reaching discharge can be achieved.
The present invention has been described in general terms in the foregoing, but it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the present invention. Therefore, modifications or improvements are within the scope of the invention without departing from the spirit of the inventive concept.
Claims (7)
1. A treatment method for green recycling of fly ash is characterized by comprising the following steps:
s1, removing large-particle impurities in the fly ash, and settling and removing the impurities;
step S2, performing deacidification operation on the fly ash and leaching metals;
step S3, guiding the fly ash treatment waste gas into a purification chamber for purification treatment;
and step S4, detecting the purified fly ash waste gas to reach the emission standard.
2. The method for recycling fly ash green color according to claim 1, wherein: and the step S1 also comprises the steps of introducing the fly ash into a cyclone dust removal device, settling and removing impurities in the fly ash, introducing the fly ash into industrial wastewater, mixing the fly ash and the industrial wastewater cooperatively, and treating the subsequent wastewater and the exhaust gas respectively.
3. The method for recycling fly ash green color according to claim 1, wherein: and step S2, the treated fly ash flue gas is led into the precursor treatment liquid for deacidification, the deacidified fly ash flue gas is conveyed into the heavy metal chelating solution, aluminum ions in the fly ash flue gas are leached out, heavy metals in the fly ash are captured, and the activity of the heavy metals is reduced.
4. The method for recycling and treating fly ash green color as claimed in claim 3, wherein: the precursor treatment solution is prepared from potassium hypochlorite and potassium chlorite, wherein the weight percentage of the potassium hypochlorite: potassium chlorite =1:0.5, and the precursor treatment solution needs to be mixed with water for use, the ratio of the precursor treatment solution to the water is 1:1, and the heavy metal chelating solution is prepared from HCL, sodium phosphate and aluminum sulfate according to the ratio of 1:0.8: 0.9.
5. The method for recycling and treating fly ash green color as claimed in claim 3, wherein: mixing is needed when the fly ash is deacidified and the metals are leached, the stirring speed of a mixing device during deacidification is 120 revolutions per minute, the stirring is carried out at normal temperature for 8-10 minutes, the stirring speed during metal leaching is consistent with that during fly ash deacidification, the temperature is kept between 40-50 ℃, and the stirring time is adjusted according to the actual leaching effect.
6. The method for recycling fly ash green color according to claim 1, wherein: step S3 further includes adsorbing odor by activated carbon filler in the clean room, performing preliminary odor removal, performing deep odor removal by UV photolysis, and heating and sterilizing by high-temperature steam.
7. The method for recycling and treating fly ash green color as claimed in claim 6, wherein: the surface layer of the activated carbon filler is sprayed with acetic acid liquid phase solution to absorb residual organic amine in waste gas and assist in absorbing peculiar smell of the waste gas.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210844734.2A CN115040970A (en) | 2022-07-19 | 2022-07-19 | Treatment method for green recycling of fly ash |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210844734.2A CN115040970A (en) | 2022-07-19 | 2022-07-19 | Treatment method for green recycling of fly ash |
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| CN115040970A true CN115040970A (en) | 2022-09-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023207091A1 (en) * | 2022-04-29 | 2023-11-02 | 天津壹鸣环境科技股份有限公司 | System for solidifying and stabilizing waste incineration fly ash and filling and forming mold bag |
Citations (5)
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| CN101716410A (en) * | 2009-11-26 | 2010-06-02 | 上海市环境工程设计科学研究院有限公司 | Flying ash processing method |
| CN106731558A (en) * | 2016-12-22 | 2017-05-31 | 青岛大学 | A kind of solwution method flue gas desulfurization and denitrification integrated technique |
| CN208042154U (en) * | 2018-01-20 | 2018-11-02 | 广州利世环境治理有限公司 | A kind of device of processing incineration flue gas of household garbage |
| CN112165981A (en) * | 2018-06-06 | 2021-01-01 | 日立造船株式会社 | Exhaust gas treatment device |
| CN114082128A (en) * | 2021-10-20 | 2022-02-25 | 神美科技有限公司 | Composite catching agent for heavy metal in waste incineration fly ash and preparation method thereof |
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2022
- 2022-07-19 CN CN202210844734.2A patent/CN115040970A/en active Pending
Patent Citations (5)
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| CN101716410A (en) * | 2009-11-26 | 2010-06-02 | 上海市环境工程设计科学研究院有限公司 | Flying ash processing method |
| CN106731558A (en) * | 2016-12-22 | 2017-05-31 | 青岛大学 | A kind of solwution method flue gas desulfurization and denitrification integrated technique |
| CN208042154U (en) * | 2018-01-20 | 2018-11-02 | 广州利世环境治理有限公司 | A kind of device of processing incineration flue gas of household garbage |
| CN112165981A (en) * | 2018-06-06 | 2021-01-01 | 日立造船株式会社 | Exhaust gas treatment device |
| CN114082128A (en) * | 2021-10-20 | 2022-02-25 | 神美科技有限公司 | Composite catching agent for heavy metal in waste incineration fly ash and preparation method thereof |
Non-Patent Citations (1)
| Title |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023207091A1 (en) * | 2022-04-29 | 2023-11-02 | 天津壹鸣环境科技股份有限公司 | System for solidifying and stabilizing waste incineration fly ash and filling and forming mold bag |
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