CN115325551A - Method for cooperatively treating arsenic-containing polluted soil by rotary kiln - Google Patents
Method for cooperatively treating arsenic-containing polluted soil by rotary kiln Download PDFInfo
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- CN115325551A CN115325551A CN202211077306.8A CN202211077306A CN115325551A CN 115325551 A CN115325551 A CN 115325551A CN 202211077306 A CN202211077306 A CN 202211077306A CN 115325551 A CN115325551 A CN 115325551A
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- soil
- arsenic
- rotary kiln
- kiln
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- 239000002689 soil Substances 0.000 title claims abstract description 111
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 229910052785 arsenic Inorganic materials 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000000428 dust Substances 0.000 claims abstract description 30
- 239000002245 particle Substances 0.000 claims abstract description 21
- 239000003245 coal Substances 0.000 claims abstract description 17
- 238000012216 screening Methods 0.000 claims abstract description 16
- 239000011230 binding agent Substances 0.000 claims abstract description 13
- 238000002485 combustion reaction Methods 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 9
- 239000010881 fly ash Substances 0.000 claims abstract description 8
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims abstract description 8
- 235000019345 sodium thiosulphate Nutrition 0.000 claims abstract description 8
- 239000002893 slag Substances 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 14
- 229910000413 arsenic oxide Inorganic materials 0.000 claims description 10
- 229960002594 arsenic trioxide Drugs 0.000 claims description 10
- KTTMEOWBIWLMSE-UHFFFAOYSA-N diarsenic trioxide Chemical compound O1[As](O2)O[As]3O[As]1O[As]2O3 KTTMEOWBIWLMSE-UHFFFAOYSA-N 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 239000000779 smoke Substances 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 6
- 239000006104 solid solution Substances 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- 230000032683 aging Effects 0.000 claims description 5
- 229910000278 bentonite Inorganic materials 0.000 claims description 5
- 239000000440 bentonite Substances 0.000 claims description 5
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 5
- 238000004939 coking Methods 0.000 claims description 5
- 238000002386 leaching Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000008188 pellet Substances 0.000 claims description 5
- 235000019353 potassium silicate Nutrition 0.000 claims description 5
- 238000007670 refining Methods 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- 239000011593 sulfur Substances 0.000 claims description 5
- 239000008187 granular material Substances 0.000 claims description 4
- 238000005469 granulation Methods 0.000 abstract description 2
- 230000003179 granulation Effects 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract 1
- 230000002195 synergetic effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 42
- 239000000571 coke Substances 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 241000282414 Homo sapiens Species 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000002309 gasification Methods 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 229910001710 laterite Inorganic materials 0.000 description 2
- 239000011504 laterite Substances 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000003900 soil pollution Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- -1 arsenic ions Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 231100001240 inorganic pollutant Toxicity 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000001698 pyrogenic effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/14—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of contaminated soil, e.g. by oil
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/24—Contaminated soil; foundry sand
Abstract
The invention discloses a method for cooperatively treating arsenic-containing polluted soil by using a rotary kiln, which specifically comprises the following steps: taking soil seepage liquid, crushing and screening, feeding and granulating, preheating by hot air flow at 750-800 ℃ and performing high-temperature synergistic treatment by hot air flow at 900-1100 ℃ in a rotary kiln to obtain furnace slag, and performing dust removal by a bag-type dust remover after cooling by a tail gas treatment humidifying tower and then exhausting by a chimney. The method can remove arsenic in soil efficiently, has shorter treatment time and higher efficiency compared with the traditional treatment method, mixes the sodium thiosulfate, the incineration fly ash, the coal powder, the red soil, the binder and a proper amount of water and then performs proportioning granulation, and the added coal powder enables the arsenic-contaminated soil particles to be fully combusted, and has small particle size and more thorough combustion, thereby improving the removal rate of arsenic.
Description
Technical Field
The invention relates to the technical field of soil treatment, in particular to a method for cooperatively treating arsenic-containing polluted soil by using a rotary kiln.
Background
The soil is one of the main natural resources on which the human beings rely for survival and is also an important component of the ecological environment of the human beings; with the increase of the discharge amount of inorganic pollutants and organic pollutants in the environment, the situation of soil pollution is more and more severe; soil pollution not only affects the yield and quality of agricultural products, but also relates to the quality of atmosphere and water environment, can harm the life and health of animals and human beings through a food chain, and some soils contain arsenic pollutants. Polluted soil is difficult to recover, and great harm is brought to agricultural products and human health. The processing method of the arsenic-containing polluted soil is researched more, and has the advantages of safe landfill, solidification and stabilization, wet processing, pyrogenic incineration and the like, most of the arsenic-containing polluted soil has poor effect on processing, the arsenic residue in the processed soil is high, the processing time is long, the removal rate is unqualified, and the requirements cannot be met.
Disclosure of Invention
The invention aims to provide a method for cooperatively treating arsenic-containing polluted soil by using a rotary kiln, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for cooperatively treating arsenic-containing contaminated soil by using a rotary kiln specifically comprises the following steps:
s1: transporting the arsenic-containing polluted soil to a polluted soil storage warehouse through a tipping bucket transport vehicle for stacking, and leaching out leachate in the polluted soil;
s2: crushing the leached arsenic-containing contaminated soil by a soil crusher, and screening by a soil screening machine, wherein the mesh number of the soil screening machine is 30-40 meshes;
s3: conveying the screened arsenic-containing polluted soil to a stirrer, adding sodium thiosulfate accounting for 10-15% of the total sulfur of the soil, incineration fly ash accounting for 2-5%, coal powder accounting for 5-10%, red soil accounting for 2-5%, a binder accounting for 3-10% and a proper amount of water, stirring, blending, uniformly mixing and refining;
s4: naturally aging until the water content is 30-40%, granulating to obtain soil granule raw material, and drying in a drying oven until the water content is 20-25%;
s5: adding the air-dried soil particle raw material into a rotary kiln, carrying out tail gas treatment at the tail of the rotary kiln, and simultaneously introducing hot air flow of 750-800 ℃ from the head of the rotary kiln to preheat and heat the lumps or pellets in the rotary kiln and carry out prereduction of arsenic oxide;
s6: controlling the kiln head to be introduced with hot air flow of 900-1100 ℃, so that the temperature of the kiln head in the rotary kiln is increased to 900-1100 ℃, the temperature of the kiln tail is 1050 ℃, the rotating speed is 5-6r/min, and the material is combusted and stays in the kiln for 30-60min;
s7: and introducing cold air into the kiln head to cool the kiln head in the rotary kiln to below 400 ℃, so that the arsenic oxide gas is solidified to form slag, and separating.
Preferably, the time for stacking the contaminated soil in the step S1 is 20 to 30 hours.
Preferably, bentonite or water glass is used as the binder in step S3.
Preferably, the mixer in step S3 is a roller mixer.
Preferably, the grain size of the raw material of the soil grains produced by the granulator in the step S4 is 15-20mm.
Preferably, the temperature in the drying oven in step S4 is 200-300 ℃.
Preferably, in the step S5, the tail gas is treated by cooling through a humidifying tower, then is dedusted by a bag-type dust remover and is exhausted through a chimney, and the smoke dust collected by the bag-type dust remover is returned to the kiln for circulation so as to realize final solid solution of arsenic in the smoke dust.
Preferably, the hot gas stream in steps S5 and S6 is produced by coking coal combustion and water gas combustion.
Compared with the prior art, the invention has the beneficial effects that: the method for cooperatively treating the arsenic-containing polluted soil by the rotary kiln can efficiently remove arsenic in the soil, has shorter treatment time and higher efficiency compared with the traditional treatment method, mixes the sodium thiosulfate, the incineration fly ash, the coal powder, the red soil, the binder and a proper amount of water, then performs proportioning granulation, and adds the coal powder to fully burn the arsenic-containing polluted soil particles, and the arsenic-containing polluted soil particles have small particle size and are more thoroughly burnt, thereby improving the removal rate of the arsenic.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides the following technical scheme:
example 1
A method for cooperatively treating arsenic-containing contaminated soil by using a rotary kiln specifically comprises the following steps:
s1: transporting the arsenic-containing polluted soil to a polluted soil storage warehouse through a tipping bucket transport vehicle for stacking, and leaching out leachate in the polluted soil;
s2: crushing the leached arsenic-containing contaminated soil by using a soil crusher, and screening by using a soil screening machine, wherein the mesh number of the soil screening machine is 35 meshes;
s3: conveying the screened arsenic-containing polluted soil to a stirrer, adding sodium thiosulfate accounting for 12% of the total sulfur of the soil, incineration fly ash accounting for 3%, coal powder accounting for 8%, laterite accounting for 4%, a binder accounting for 8% and a proper amount of water, stirring, blending, and refining after uniformly mixing;
s4: naturally aging until the water content is 35%, granulating to obtain a soil particle raw material, and drying the soil particle raw material in a drying oven until the water content is 23%;
s5: adding the air-dried soil particle raw material into a rotary kiln, carrying out tail gas treatment at the tail of the rotary kiln, and simultaneously introducing 780 ℃ hot air flow from the head of the rotary kiln to preheat and heat the lumps or pellets in the rotary kiln and carry out pre-reduction on arsenic oxide;
s6: controlling the kiln head to be introduced with hot air flow of 1000 ℃ so that the temperature of the kiln head in the rotary kiln is increased to 1000 ℃, the temperature of the kiln tail is 1050 ℃, the rotating speed is 5r/min, and the materials are combusted and stay for 40min in the kiln;
s7: and introducing cold air into the kiln head to cool the kiln head in the rotary kiln to 350 ℃, so that the arsenic oxide gas is solidified to form furnace slag, and separating.
Further, the time for stacking the contaminated soil in the step S1 is 25 hours, the binder in the step S3 is bentonite or water glass, and the stirrer in the step S3 is a roller stirrer.
Specifically, the particle size of the raw material of the soil granules produced by the granulator in the step S4 is 18mm, and the temperature in the drying oven in the step S4 is 250 ℃.
In addition, in the step S5, the tail gas is treated, the temperature of the tail gas is reduced through a humidifying tower, the tail gas is dedusted through a bag-type dust remover and then is exhausted through a chimney, the smoke dust collected by the bag-type dust remover returns to the kiln to circulate, so that the final solid solution of arsenic in the smoke dust is realized, hot gas flows in the steps S5 and S6 are generated by burning of coking coal and burning of water gas, the water gas mainly comprises carbon monoxide and hydrogen and is generated by a water gas generator, the temperature of high-temperature gas generated by burning of the water gas generator is relatively low, but the temperature controllability is high. A steam chamber in the water gas generator can generate water steam through a boiler, then the water steam is introduced into a coke combustion chamber and contacts with high-temperature coke, and water gas is formed through a coal gasification reaction.
Example 2
A method for cooperatively treating arsenic-containing polluted soil by using a rotary kiln specifically comprises the following steps:
s1: conveying the arsenic-containing contaminated soil to a contaminated soil storage warehouse through a tipping bucket transport vehicle for stacking, and leaching leachate in the contaminated soil;
s2: crushing the arsenic-containing contaminated soil with leachate by using a soil crusher, and screening by using a soil screening machine, wherein the mesh number of a screen of the soil screening machine is 30 meshes;
s3: conveying the screened arsenic-containing polluted soil into a stirrer, adding sodium thiosulfate accounting for 10% of the total sulfur of the soil, 2% of incineration fly ash, 5% of coal powder, 2% of red soil, 3% of a binder and a proper amount of water, stirring, blending, uniformly mixing and refining;
s4: naturally aging until the water content is 30%, granulating to obtain a soil particle raw material, and drying the soil particle raw material in a drying oven until the water content is 20%;
s5: adding the air-dried soil particle raw material into a rotary kiln, carrying out tail gas treatment at the tail of the rotary kiln, and simultaneously introducing hot air flow of 750 ℃ from the head of the rotary kiln to preheat and heat the lumps or pellets in the rotary kiln and carry out pre-reduction on arsenic oxide;
s6: controlling the kiln head to be introduced with hot air flow of 900 ℃ so that the temperature of the kiln head in the rotary kiln is increased to 900 ℃, the temperature of the kiln tail is 1050 ℃, the rotating speed is 6r/min, and the materials are combusted and stay for 30min in the kiln;
s7: and introducing cold air into the kiln head to cool the kiln head in the rotary kiln to 350 ℃, so that the arsenic oxide gas is solidified to form slag, and separating.
Further, the time for stacking the contaminated soil in the step S1 is 20 hours, the binder in the step S3 is bentonite or water glass, and the stirrer in the step S3 is a roller stirrer.
Specifically, the particle size of the raw material of the soil particles produced by the granulator in the step S4 is 15mm, and the temperature in the drying oven in the step S4 is 200 ℃.
In addition, in the step S5, the tail gas is treated by cooling through a humidifying tower, dust is removed through a bag-type dust remover, then the tail gas is exhausted through a chimney, the smoke dust collected by the bag-type dust remover returns to the kiln for circulation, so that final solid solution of arsenic in the smoke dust is realized, hot gas flows in the steps S5 and S6 are generated by burning of coking coal and burning of water gas, the water gas mainly comprises carbon monoxide and hydrogen and is generated by a water gas generator, the temperature of high-temperature gas generated by burning of the water gas generator is relatively low, but the temperature controllability is high. A steam chamber in the water gas generator can generate water steam through a boiler, then the water steam is introduced into a coke combustion chamber and contacts with high-temperature coke, and water gas is formed through a coal gasification reaction.
Example 3
A method for cooperatively treating arsenic-containing polluted soil by using a rotary kiln specifically comprises the following steps:
s1: conveying the arsenic-containing contaminated soil to a contaminated soil storage warehouse through a tipping bucket transport vehicle for stacking, and leaching leachate in the contaminated soil;
s2: crushing the arsenic-containing contaminated soil with leachate by using a soil crusher, and screening by using a soil screening machine, wherein the mesh number of a screen of the soil screening machine is 40 meshes;
s3: conveying the screened arsenic-containing polluted soil to a stirrer, adding sodium thiosulfate accounting for 15% of the total sulfur of the soil, incineration fly ash accounting for 5%, coal powder accounting for 10%, laterite accounting for 5%, a binder accounting for 10% and a proper amount of water, stirring, blending, and refining after uniformly mixing;
s4: naturally aging until the water content is 40%, granulating to obtain a soil particle raw material, and adding the soil particle raw material into a drying oven to dry until the water content is 25%;
s5: adding the air-dried soil particle raw material into a rotary kiln, carrying out tail gas treatment at the tail of the rotary kiln, and simultaneously introducing hot air flow of 800 ℃ from the head of the rotary kiln to preheat and heat the lumps or pellets in the rotary kiln and carry out pre-reduction on arsenic oxide;
s6: controlling the kiln head to be introduced with 1100 ℃ hot air flow, so that the temperature of the kiln head in the rotary kiln is increased to 1100 ℃, the temperature of the kiln tail is 1050 ℃, the rotating speed is 6r/min, and the materials are combusted and stay for 60min in the kiln;
s7: and introducing cold air into the kiln head to cool the kiln head in the rotary kiln to 300 ℃ so that the arsenic oxide gas is solidified to form slag, and separating.
Further, the time for stacking the contaminated soil in the step S1 is 30 hours, the binder in the step S3 is bentonite or water glass, and the stirrer in the step S3 is a roller stirrer.
Specifically, the particle size of the raw material of the soil granules produced by the granulator in the step S4 is 120mm, and the temperature in the drying oven in the step S4 is 300 ℃.
In addition, in the step S5, the tail gas is treated by cooling through a humidifying tower, dust is removed through a bag-type dust remover, then the tail gas is exhausted through a chimney, the smoke dust collected by the bag-type dust remover returns to the kiln for circulation, so that final solid solution of arsenic in the smoke dust is realized, hot gas flows in the steps S5 and S6 are generated by burning of coking coal and burning of water gas, the water gas mainly comprises carbon monoxide and hydrogen and is generated by a water gas generator, the temperature of high-temperature gas generated by burning of the water gas generator is relatively low, but the temperature controllability is high. A steam chamber in the water gas generator can generate steam through a boiler, and then the steam is introduced into a coke combustion chamber and contacts with high-temperature coke to form water gas through a coal gasification reaction.
The method for treating arsenic-containing contaminated soil by using the rotary kiln in cooperation with the traditional method for treating heavy metal contaminated soil such as zinc, chromium and the like in the three embodiments of the invention has the following specific characteristics in terms of pollutant removal rate, treatment time reduction rate and raise dust generation rate:
| arsenic removal rate/%) | Reduction in treatment time% | Dust generation rate/%) | |
| Example 1 | 97.89 | 30.75 | 4.85 |
| Example 2 | 98.32 | 32.39 | 3.15 |
| Example 3 | 98.13 | 31.75 | 3.09 |
| Conventional | 80-85 | Is free of | 30-40 |
The arsenic solid solution principle in the method for cooperatively treating the arsenic-containing polluted soil by using the rotary kiln disclosed by the invention is as follows: under the decomposition action of high-heat airflow in the rotary kiln, mineral dust and arsenic metal particles are fully decomposed to generate ion electron clouds, after metal ions with positive charges and mineral ions with negative charges are fully combined under the high-temperature catalysis action of the system, the metal ions and the mineral ions enter the rotary kiln to be calcined, and finally most of arsenic ions are distributed in intermediate minerals to replace part of Fe and Al to be dissolved in cement clinker in a solid mode. And a small amount of arsenic dust enters a dust collecting system along with the flue gas to be further collected, and then the arsenic dust is further returned to the kiln for circulation and finally is dissolved in the cement clinker. And a very small amount of arsenic is discharged along with the flue gas after reaching the standard.
The method for treating the arsenic-containing polluted soil by the aid of the rotary kiln can remove arsenic in the soil efficiently, the treatment time is shorter than that of a traditional treatment method, the efficiency is higher, sodium thiosulfate, incineration fly ash, coal dust, red soil, a binding agent and a proper amount of water are mixed and then are proportioned and granulated, the added coal dust enables the arsenic-containing polluted soil to be combusted fully, the particle size is small, combustion is more thorough, and accordingly the arsenic removal rate is improved.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A method for cooperatively treating arsenic-containing contaminated soil by using a rotary kiln is characterized by comprising the following steps: the method specifically comprises the following steps:
s1: transporting the arsenic-containing polluted soil to a polluted soil storage warehouse through a tipping bucket transport vehicle for stacking, and leaching out leachate in the polluted soil;
s2: crushing the arsenic-containing polluted soil with leachate by using a soil crusher, and screening by using a soil screening machine, wherein the mesh number of the soil screening machine is 30-40 meshes;
s3: conveying the screened arsenic-containing polluted soil into a stirrer, adding sodium thiosulfate accounting for 10-15% of the total sulfur of the soil, incineration fly ash accounting for 2-5%, coal powder accounting for 5-10%, red soil accounting for 2-5%, a binder accounting for 3-10% and a proper amount of water, stirring, blending, uniformly mixing and refining;
s4: naturally aging until the water content is 30-40%, granulating to obtain soil granule raw material, and drying in a drying oven until the water content is 20-25%;
s5: adding the air-dried soil particle raw material into a rotary kiln, carrying out tail gas treatment at the tail of the rotary kiln, and simultaneously introducing 750-800 ℃ hot gas flow from the kiln head to preheat and heat the lumps or pellets in the kiln and carry out pre-reduction on arsenic oxide;
s6: controlling the kiln head to be introduced with hot air flow of 900-1100 ℃ so that the temperature of the kiln head in the rotary kiln is increased to 900-1100 ℃, the temperature of the kiln tail is 1050 ℃, the rotating speed is 5-6r/min, and the materials are combusted and stay for 30-60min in the kiln;
s7: and introducing cold air into the kiln head to cool the kiln head in the rotary kiln to below 400 ℃, so that the arsenic oxide gas is solidified to form slag, and separating.
2. The method for cooperatively treating arsenic-contaminated soil by using the rotary kiln according to claim 1, wherein the method comprises the following steps: the stacking time of the contaminated soil in the step S1 is 20-30h.
3. The method for cooperatively treating arsenic-contaminated soil by using the rotary kiln according to claim 1, wherein the method comprises the following steps: and the binder in the step S3 is bentonite or water glass.
4. The method for cooperatively treating arsenic-contaminated soil by using the rotary kiln according to claim 1, wherein the method comprises the following steps: the stirrer in the step S3 is a roller stirrer.
5. The method for the cooperative treatment of arsenic-contaminated soil by using the rotary kiln as claimed in claim 1, wherein the method comprises the following steps: the grain diameter of the soil grain raw material produced by the granulator in the step S4 is 15-20mm.
6. The method for cooperatively treating arsenic-contaminated soil by using the rotary kiln according to claim 1, wherein the method comprises the following steps: the temperature in the drying box in the step S4 is 200-300 ℃.
7. The method for the cooperative treatment of arsenic-contaminated soil by using the rotary kiln as claimed in claim 1, wherein the method comprises the following steps: and in the step S5, the tail gas is treated by cooling through a humidifying tower, then is dedusted through a bag-type dust remover and is exhausted through a chimney, and the smoke dust collected by the bag-type dust remover returns to the kiln for circulation so as to realize final solid solution of arsenic in the smoke dust.
8. The method for cooperatively treating arsenic-contaminated soil by using the rotary kiln according to claim 1, wherein the method comprises the following steps: the hot gas stream in steps S5 and S6 is generated by coking coal combustion and water gas combustion.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115947550A (en) * | 2022-12-30 | 2023-04-11 | 湖南博一环保科技有限公司 | Method for cooperatively treating arsenic-containing waste residues by using rotary kiln |
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2022
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115947550A (en) * | 2022-12-30 | 2023-04-11 | 湖南博一环保科技有限公司 | Method for cooperatively treating arsenic-containing waste residues by using rotary kiln |
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