CN116492806A - Method for removing peculiar smell after treatment of incineration fly ash by chelating agent - Google Patents
Method for removing peculiar smell after treatment of incineration fly ash by chelating agent Download PDFInfo
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- CN116492806A CN116492806A CN202310203457.1A CN202310203457A CN116492806A CN 116492806 A CN116492806 A CN 116492806A CN 202310203457 A CN202310203457 A CN 202310203457A CN 116492806 A CN116492806 A CN 116492806A
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- chelating agent
- fly ash
- reagent
- peculiar smell
- activated clay
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- 239000010881 fly ash Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000002738 chelating agent Substances 0.000 title claims abstract description 38
- 239000004927 clay Substances 0.000 claims abstract description 38
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 36
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 230000008569 process Effects 0.000 claims abstract description 14
- 230000008859 change Effects 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 12
- GSFSVEDCYBDIGW-UHFFFAOYSA-N 2-(1,3-benzothiazol-2-yl)-6-chlorophenol Chemical compound OC1=C(Cl)C=CC=C1C1=NC2=CC=CC=C2S1 GSFSVEDCYBDIGW-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 239000008367 deionised water Substances 0.000 claims description 9
- 229910021641 deionized water Inorganic materials 0.000 claims description 9
- 238000001179 sorption measurement Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 4
- 230000004913 activation Effects 0.000 claims description 3
- 239000003463 adsorbent Substances 0.000 claims description 3
- 239000011335 coal coke Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 230000020477 pH reduction Effects 0.000 claims description 3
- 239000002006 petroleum coke Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000000197 pyrolysis Methods 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 229910021529 ammonia Inorganic materials 0.000 abstract description 14
- 239000006227 byproduct Substances 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 150000001412 amines Chemical class 0.000 abstract description 2
- -1 ammonia ions Chemical class 0.000 description 6
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 238000004056 waste incineration Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000009920 chelation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D3/00—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances
- A62D3/30—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents
- A62D3/33—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents by chemical fixing the harmful substance, e.g. by chelation or complexation
-
- 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
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D2101/00—Harmful chemical substances made harmless, or less harmful, by effecting chemical change
- A62D2101/08—Toxic combustion residues, e.g. toxic substances contained in fly ash from waste incineration
-
- 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
-
- 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
- B01D2253/106—Silica or silicates
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the technical field of fly ash treatment, and particularly relates to a method for removing peculiar smell after incineration of fly ash by chelating agent treatment, which comprises the following steps: adding 2-5% of active carbon into the liquid chelating agent sodium dimethyl dithiocarbamate in a divided manner to obtain a reagent A; adding 1-3% of activated clay into the reagent A for multiple times, stirring for 10-30 minutes, standing, and filtering to obtain a reagent B; taking two beakers, adding 20-30 g of fly ash samples into the two beakers, heating to above 80 ℃ in a water bath, adding a normal liquid chelating agent into one beaker, adding an equivalent amount of reagent B into the other beaker, and recording the generation condition of peculiar smell and the material change condition in the peculiar smell in the chelating process. The test shows that the activated carbon and the activated clay can effectively adsorb free amine and reaction byproducts in the chelating agent to remove ammonia smell, and the removal rate of ammonia can be improved through the modified activated clay.
Description
Technical Field
The invention relates to the technical field of fly ash treatment, in particular to a method for removing peculiar smell after incineration of fly ash by using a chelating agent.
Background
Fly ash is a main pollution source of a waste incineration power plant and is residues collected in a waste incineration flue gas purification system and a heat recovery system (the general ash yield is 3% -5% of the waste incineration amount).
The fly ash contains a certain amount of dioxin, heavy metals and other harmful substances, and if the heavy metals are directly discharged after untreated, the fly ash can pollute soil and underground water and cause harm to the environment.
At present, a stabilizing agent mainly composed of sodium dimethyldithiocarbamate is widely used for stabilizing fly ash. However, in the treatment process, the exothermic effect of the chelation process volatilizes the free dimethylamine and byproducts which do not participate in the reaction in the medicament, and the free dimethylamine and byproducts enter the atmosphere, so that the peculiar smell of an operation room, a temporary storage room or a landfill site is large, the environment is polluted, and the physical health is affected seriously.
Therefore, we propose a method for removing the peculiar smell after the incineration fly ash is treated by the chelating agent to solve the above problems.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a method for removing peculiar smell after incineration fly ash is treated by a chelating agent.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a method for removing peculiar smell after incineration fly ash is treated by chelating agent comprises the following steps:
s1, adding 2-5% of active carbon into a liquid chelating agent sodium dimethyl dithiocarbamate in a fractional manner to obtain a reagent A;
s2, adding 1-3% of activated clay into the reagent A for multiple times, stirring for 10-30 minutes, standing, and filtering to obtain a reagent B;
s3, taking two beakers, adding 20-30 g of fly ash samples into the two beakers, heating to above 80 ℃ in a water bath, adding a normal liquid chelating agent into one beaker, adding an equivalent amount of reagent B into the other beaker, and recording the generation condition of peculiar smell and the change condition of substances in the peculiar smell in the chelating process.
In the method for removing the peculiar smell after the incineration fly ash is treated by the chelating agent, the activated carbon in the step S1 is prepared by pyrolysis and activation processing of raw materials containing wood, coal and petroleum coke, and the micropore diameter of the surface of the activated carbon is between 2 and 50 nm.
In the method for removing the peculiar smell after the incineration fly ash is treated by the chelating agent, the activated clay is an adsorbent prepared by taking clay as a raw material, performing inorganic acidification treatment, rinsing by water and drying.
In the method for removing the peculiar smell after the incineration fly ash is treated by the chelating agent, the modified activated clay is added into the reagent A in a separated mode after the step S1, the mixture is stirred for 10 to 30 minutes and kept stand to obtain the reagent C, a beaker is taken, 20 to 30 grams of fly ash sample is added into the beaker, the beaker is heated to more than 80 ℃ in a water bath, the reagent C is added into the beaker, and the generation condition of the peculiar smell and the material change condition in the peculiar smell in the chelating process are recorded.
In the above method for removing the peculiar smell after the treatment of the incineration fly ash by the chelating agent, the preparation method of the modified activated clay comprises the following steps:
A. 100g of activated clay with the granularity of 100 meshes is washed by deionized water and dried;
B. 8g of activated clay and 2g of 0.5mol/L NaOH are taken and dissolved together by 100mL of deionized water, and then the mixture is placed in a shaking table, and the shaking table is oscillated for 2 hours at 25 ℃ and 120r/min, and then the activated clay is washed to be neutral by the deionized water, and is dried at 105 ℃ and then placed in a dryer for standby.
In the above method for removing the odor after the incineration fly ash is treated by the chelating agent, in the step S3, the ammonia gas generated in the chelating process is detected in real time by a portable ammonia gas detector, and the corresponding change condition is recorded.
In the method for removing the peculiar smell after the incineration fly ash is treated by the chelating agent, the detection result of the ammonia detector can be used for knowing that the reagent B added with the activated clay has certain adsorption capacity to ammonia, and the activated clay modified by NaOH has better adsorption capacity to low-concentration ammonia.
Compared with the prior art, the method for removing the peculiar smell after the incineration fly ash is treated by the chelating agent has the advantages that: the test shows that the activated carbon and the activated clay can effectively adsorb free amine and reaction byproducts in the chelating agent to remove ammonia smell, the ammonia removal rate can be improved through the modified activated clay, and the removal rate is highest when the PH is controlled at 9.0.
Drawings
FIG. 1 is a schematic diagram of steps of a method for removing odor after incineration fly ash treatment by using a chelating agent according to the present invention;
FIG. 2 is a graph showing the effect of pH on ammonia removal in a method for removing off-flavor from incineration fly ash by chelating agent treatment according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Example 1
Referring to fig. 1, a method for removing peculiar smell after incineration fly ash is treated by a chelating agent, comprising the following steps:
s1, adding 2% active carbon into a liquid chelating agent sodium dimethyl dithiocarbamate for times to obtain a reagent A;
s2, adding 1% of activated clay into the reagent A for multiple times, stirring for 10 minutes, standing, and filtering to obtain a reagent B;
s3, taking two beakers, adding 20 g of fly ash samples into the two beakers, heating to more than 80 ℃ in a water bath, adding a normal liquid chelating agent into one beaker, adding an equivalent amount of reagent B into the other beaker, and recording the generation condition of peculiar smell and the change condition of substances in the peculiar smell in the chelating process.
The activated carbon in the step S1 is prepared from raw materials containing wood, coal and petroleum coke through pyrolysis and activation processing, the micropore diameter of the surface of the activated carbon is between 2 and 50nm, and the activated clay is an adsorbent prepared from clay serving as a raw material through inorganic acidification treatment, water rinsing and drying.
Further, in step S3, ammonia gas generated in the chelating process is detected in real time by a portable ammonia gas detector, and corresponding change conditions are recorded.
Example 2
The difference from example 1 is that:
s1, adding 4% active carbon into a liquid chelating agent sodium dimethyl dithiocarbamate for times to obtain a reagent A;
s2, adding 2% of activated clay into the reagent A for multiple times, stirring for 20 minutes, standing, and filtering to obtain a reagent B;
s3, taking two beakers, adding 25 g of fly ash samples into the two beakers, heating to more than 80 ℃ in a water bath, adding a normal liquid chelating agent into one beaker, adding an equivalent amount of reagent B into the other beaker, and recording the generation condition of peculiar smell and the change condition of substances in the peculiar smell in the chelating process.
Example 3
The difference from examples 1 and 2 is that:
s1, adding 5% active carbon into a liquid chelating agent sodium dimethyl dithiocarbamate for times to obtain a reagent A;
s2, adding 1-3% of activated clay into the reagent A for multiple times, stirring for 30 minutes, standing, and filtering to obtain a reagent B;
s3, taking two beakers, adding 30 g of fly ash samples into the two beakers, heating to more than 80 ℃ in a water bath, adding a normal liquid chelating agent into one beaker, adding an equivalent amount of reagent B into the other beaker, and recording the generation condition of peculiar smell and the change condition of substances in the peculiar smell in the chelating process.
Example 4
The difference from the previous embodiment is that:
after the step S1, adding the modified activated clay into the reagent A for multiple times, stirring for 30 minutes, standing to obtain a reagent C, taking a beaker, adding 30 g of fly ash sample into the beaker, heating to more than 80 ℃ in a water bath, adding the reagent C into the beaker, and recording the generation condition of peculiar smell and the change condition of substances in the peculiar smell in the chelating process, wherein the preparation method of the modified activated clay specifically comprises the following steps:
A. 100g of activated clay with the granularity of 100 meshes is washed by deionized water and dried;
B. 8g of activated clay and 2g of 0.5mol/L NaOH are taken and dissolved together by 100mL of deionized water, and then the mixture is placed in a shaking table, and the shaking table is oscillated for 2 hours at 25 ℃ and 120r/min, and then the activated clay is washed to be neutral by the deionized water, and is dried at 105 ℃ and then placed in a dryer for standby.
After the above-described sets of examples and detection by an ammonia gas detector, the following results were obtained: the detection result of the ammonia detector can be used for knowing that the reagent B added with the activated clay has certain adsorption capacity to ammonia, and the activated clay modified by NaOH has better adsorption capacity to low-concentration ammonia, and the method is specific:
the surface of the activated clay modified by NaOH is distributed with a large number of holes with fine pore diameters, which is favorable for the adsorption of ions, ammonia ions have positive charges, and hydrogen ions with positive charges also exist in the system, because the diameter of the hydrogen ions is smaller than that of the ammonia ions, when the PH value is 6-9, the concentration of the hydrogen ions is reduced, the exchange capacity of the ammonia ions is enhanced, and the removal rate reaches the maximum value when the PH value is 9.0, and the system is shown by referring to figure 2.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (7)
1. The method for removing the peculiar smell after the incineration fly ash is treated by the chelating agent is characterized by comprising the following steps of:
s1, adding 2-5% of active carbon into a liquid chelating agent sodium dimethyl dithiocarbamate in a fractional manner to obtain a reagent A;
s2, adding 1-3% of activated clay into the reagent A for multiple times, stirring for 10-30 minutes, standing, and filtering to obtain a reagent B;
s3, taking two beakers, adding 20-30 g of fly ash samples into the two beakers, heating to above 80 ℃ in a water bath, adding a normal liquid chelating agent into one beaker, adding an equivalent amount of reagent B into the other beaker, and recording the generation condition of peculiar smell and the change condition of substances in the peculiar smell in the chelating process.
2. The method for removing peculiar smell after treating incineration fly ash by using a chelating agent according to claim 1, wherein the activated carbon in the step S1 is prepared by pyrolysis and activation processing of raw materials containing carbon of wood, coal and petroleum coke, and the micropore diameter of the surface of the activated carbon is between 2 and 50 nm.
3. The method for removing peculiar smell after the incineration fly ash is treated by using the chelating agent as claimed in claim 2, wherein the activated clay is an adsorbent prepared by taking clay as a raw material, performing inorganic acidification treatment, rinsing by water and drying.
4. The method for removing the peculiar smell after the incineration fly ash is treated by the chelating agent according to claim 3, wherein the modified activated clay is added into the reagent A in a divided manner after the step S1, the mixture is stirred for 10 to 30 minutes and kept stand to obtain the reagent C, a beaker is taken, 20 to 30 grams of fly ash sample is added into the beaker, the mixture is heated to more than 80 ℃ in a water bath, the reagent C is added into the beaker, and the generation condition of the peculiar smell and the material change condition in the peculiar smell in the chelating process are recorded.
5. The method for removing odor after incineration fly ash treatment by using a chelating agent according to claim 4, wherein the preparation method of the modified activated clay comprises the following steps:
A. 100g of activated clay with the granularity of 100 meshes is washed by deionized water and dried;
B. 8g of activated clay and 2g of 0.5mol/L NaOH are taken and dissolved together by 100mL of deionized water, and then the mixture is placed in a shaking table, and the shaking table is oscillated for 2 hours at 25 ℃ and 120r/min, and then the activated clay is washed to be neutral by the deionized water, and is dried at 105 ℃ and then placed in a dryer for standby.
6. The method for removing odor after incineration fly ash treatment by using a chelating agent according to claim 5, wherein in the step S3, ammonia gas generated in the chelating process is detected in real time by a portable ammonia gas detector, and corresponding change conditions are recorded.
7. The method for removing odor after incineration fly ash treatment by using a chelating agent according to claim 6, wherein the detection result of the ammonia gas detector is used for knowing that the reagent B added with activated clay has a certain adsorption capacity to ammonia gas, and the activated clay modified by NaOH has a better adsorption capacity to low-concentration ammonia gas.
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| CN202310203457.1A CN116492806A (en) | 2023-03-06 | 2023-03-06 | Method for removing peculiar smell after treatment of incineration fly ash by chelating agent |
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| CN202310203457.1A CN116492806A (en) | 2023-03-06 | 2023-03-06 | Method for removing peculiar smell after treatment of incineration fly ash by chelating agent |
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