CN115947550A - Method for cooperatively treating arsenic-containing waste residues by using rotary kiln - Google Patents
Method for cooperatively treating arsenic-containing waste residues by using rotary kiln Download PDFInfo
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- CN115947550A CN115947550A CN202211743543.3A CN202211743543A CN115947550A CN 115947550 A CN115947550 A CN 115947550A CN 202211743543 A CN202211743543 A CN 202211743543A CN 115947550 A CN115947550 A CN 115947550A
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- containing waste
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- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 229910052785 arsenic Inorganic materials 0.000 title claims abstract description 80
- 239000002699 waste material Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000002893 slag Substances 0.000 claims abstract description 31
- 239000000428 dust Substances 0.000 claims abstract description 29
- 239000002245 particle Substances 0.000 claims abstract description 28
- 239000003245 coal Substances 0.000 claims abstract description 19
- 238000012216 screening Methods 0.000 claims abstract description 16
- 239000011435 rock Substances 0.000 claims abstract description 13
- 239000011230 binding agent Substances 0.000 claims abstract description 11
- 239000000843 powder Substances 0.000 claims abstract description 11
- 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
- 238000001035 drying Methods 0.000 claims description 15
- 229910000413 arsenic oxide Inorganic materials 0.000 claims description 10
- 229960002594 arsenic trioxide Drugs 0.000 claims description 10
- 239000000779 smoke Substances 0.000 claims description 10
- 238000002485 combustion reaction Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 239000002689 soil Substances 0.000 claims description 6
- 239000006104 solid solution Substances 0.000 claims description 6
- 235000019738 Limestone Nutrition 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- 230000032683 aging Effects 0.000 claims description 5
- 239000000440 bentonite Substances 0.000 claims description 5
- 229910000278 bentonite Inorganic materials 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
- 239000006028 limestone Substances 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
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 claims description 5
- 229910052683 pyrite Inorganic materials 0.000 claims description 5
- 239000011028 pyrite Substances 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
- 238000001816 cooling Methods 0.000 claims description 3
- KTTMEOWBIWLMSE-UHFFFAOYSA-N diarsenic trioxide Chemical compound O1[As](O2)O[As]3O[As]1O[As]2O3 KTTMEOWBIWLMSE-UHFFFAOYSA-N 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005469 granulation Methods 0.000 abstract description 2
- 230000003179 granulation Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 47
- IKWTVSLWAPBBKU-UHFFFAOYSA-N a1010_sial Chemical compound O=[As]O[As]=O IKWTVSLWAPBBKU-UHFFFAOYSA-N 0.000 description 8
- 239000000571 coke Substances 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000004568 cement Substances 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
- -1 powdered sandstone Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 231100000719 pollutant Toxicity 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
Classifications
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a method for cooperatively treating arsenic-containing waste residues by using a rotary kiln, which specifically comprises the following steps: and (4) crushing and screening the waste residues, feeding and granulating, preheating in a rotary kiln and carrying out high-temperature incineration cooperative treatment to obtain the slag. The method can remove arsenic in the waste residue with high efficiency, has shorter treatment time and higher efficiency compared with the traditional treatment method, prevents secondary pollution by treating the tail gas of the dust, mixes the sodium thiosulfate, the incineration fly ash, the coal powder, the rock, the binding agent and a proper amount of water and then performs proportioning granulation, and the added coal powder ensures that the arsenic-containing waste residue particles are fully combusted, has small particle size and is more thoroughly combusted, thereby improving the removal rate of the arsenic, effectively utilizing the preheating and high-temperature incineration of the rotary kiln to fix the arsenic in the clinker, reducing the activity of the arsenic and realizing the thorough harmlessness of the arsenic-containing waste residue.
Description
Technical Field
The invention relates to the technical field of waste residue treatment, in particular to a method for cooperatively treating arsenic-containing waste residue by using a rotary kiln.
Background
With the beginning of industrialization and modernization, the scale of industrial production is continuously enlarged, and the extensive application of arsenic and the disordered stacking disposal of arsenic-containing waste residues cause a great amount of arsenic pollution of soil. Currently, arsenic contamination has become a serious environmental problem. Arsenic pollution is mainly from mining or smelting process wastes of arsenic-containing ores and industrial waste residues of arsenic production enterprises. Arsenic is widely present in nature, arsenic and its compounds are widely used, and a large amount of arsenic-containing waste residues are also produced along with the mass production of arsenic. The disposal method of the arsenic-containing waste residue is researched more, such as safe landfill, solidification stabilization, wet treatment, fire incineration and the like, most of the arsenic-containing waste residues are poor in treatment effect, the arsenic residue in the waste residues after treatment is high, the treatment 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 waste residues by using a rotary kiln so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for cooperatively treating arsenic-containing waste residues by using a rotary kiln specifically comprises the following steps:
s1: conveying the arsenic-containing waste residues to a residue soil crusher through a tipping bucket truck for crushing, and screening through a screening machine, wherein the mesh number of the screening machine is 30-40 meshes;
s3: conveying the screened arsenic-containing waste residues into a stirrer, adding sodium thiosulfate accounting for 15-20% of the total sulfur of the arsenic-containing waste residues, incineration fly ash accounting for 8-15%, coal powder accounting for 8-15%, rock accounting for 6-10%, a binder accounting for 3-10% and a proper amount of water, stirring and blending, and refining after uniform mixing;
s4: naturally aging until the water content is 30-40%, granulating to obtain waste slag particles, and drying the waste slag particles in a drying oven until the water content is 20-25%;
s5: adding the air-dried waste slag particles into a rotary kiln, carrying out tail gas treatment at the tail of the rotary kiln, and introducing hot air flow at 750-800 ℃ from the kiln head to preheat and heat the lumps or pellets in the kiln and carry out pre-reduction 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 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.
Preferably, the rock in step S3 is mixed with limestone, powdered sandstone and pyrite slag in a ratio of 2.
Preferably, bentonite or water glass is used as the binder in step S3.
Preferably, the mixer in the step S3 is a roller mixer, and the rotating speed of the mixer is 100-150r/min.
Preferably, the particle size of the waste residue particles 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 a humidifying tower, the temperature of the tail gas is reduced, the tail gas is dedusted by a bag-type dust remover and then is exhausted by a chimney, and the smoke 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.
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 waste residue by the rotary kiln can efficiently remove arsenic in the waste residue, has shorter treatment time and higher efficiency compared with the traditional treatment method, prevents secondary pollution by treating the tail gas of the dust, mixes the sodium thiosulfate, the incineration fly ash, the coal powder, the rock, the binder and a proper amount of water and then performs proportioning granulation, and the added coal powder ensures that the arsenic-containing waste residue particles are fully combusted, has small particle size and more thorough combustion, thereby improving the removal rate of the arsenic, effectively utilizing the preheating and high-temperature incineration of the rotary kiln to fix the arsenic in clinker, reducing the activity of the arsenic and realizing the thorough harmlessness of the arsenic-containing waste residue.
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 waste residues by using a rotary kiln specifically comprises the following steps:
s1: conveying the arsenic-containing waste residues to a residue soil crusher through a tipping bucket truck for crushing, and screening through a screening machine, wherein the mesh number of the screening machine is 35 meshes;
s3: conveying the screened arsenic-containing waste residues into a stirrer, adding sodium thiosulfate accounting for 18% of the total sulfur of the arsenic-containing waste residues, incineration fly ash accounting for 10%, coal powder accounting for 10%, rocks accounting for 8%, a binder accounting for 8% and a proper amount of water, stirring, blending, and refining;
s4: naturally aging until the water content is 35%, granulating to obtain waste slag particles, and drying the waste slag particles in a drying oven until the water content is 23%;
s5: adding the waste slag particles into a rotary kiln after air drying, carrying out tail gas treatment at the tail of the rotary kiln, and simultaneously introducing hot air flow of 770 ℃ from the kiln head to preheat the lumps or pellets in the kiln, heating and carrying 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 in the kiln and stay for 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.
Further, the rock in step S3 is mixed with limestone, powdered sandstone, and pyrite slag in a ratio of 2.
Specifically, the binder in the step S3 is bentonite or water glass, the stirrer in the step S3 is a roller stirrer, and the rotating speed of the stirrer is 130r/min.
It should be noted that the particle size of the slag produced by the pelletizer in step S4 was 18mm, and the temperature in the drying oven in step S4 was 250 ℃.
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.
Example 2
A method for cooperatively treating arsenic-containing waste residues by a rotary kiln specifically comprises the following steps:
s1: conveying the arsenic-containing waste residues to a residue soil crusher through a tipping bucket truck for crushing, and screening through a screening machine, wherein the screen mesh number of the screening machine is 30 meshes;
s3: conveying the screened arsenic-containing waste residues into a stirrer, adding sodium thiosulfate accounting for 15% of the total sulfur of the arsenic-containing waste residues, incineration fly ash accounting for 8%, coal powder accounting for 8%, rock accounting for 6%, a binder accounting for 3% and a proper amount of water, stirring, blending, and refining after uniformly mixing;
s4: naturally aging until the water content is 30%, granulating to obtain waste slag particles, and drying the waste slag particles in a drying oven until the water content is 20%;
s5: adding the air-dried waste slag particles into a rotary kiln, carrying out tail gas treatment at the tail of the rotary kiln, and simultaneously introducing 750 ℃ hot gas flow from the kiln head to preheat the lumps or pellets in the kiln, heating and carrying out pre-reduction on arsenic oxide;
s6: controlling the kiln head to be introduced with 900 ℃ hot air flow, 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 5r/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 below 400 ℃, so that the arsenic oxide gas is solidified to form slag, and separating.
Further, the rock in step S3 is mixed with limestone, powdery sandstone and pyrite slag in a ratio of 2.
Specifically, the adhesive in the step S3 is bentonite or water glass, the stirrer in the step S3 is a roller stirrer, and the rotating speed of the stirrer is 100r/min.
It should be noted that the particle size of the slag produced by the granulator in step S4 is 15mm, and the temperature in the drying oven in step S4 is 200 ℃.
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 3
A method for cooperatively treating arsenic-containing waste residues by using a rotary kiln specifically comprises the following steps:
s1: conveying the arsenic-containing waste residues to a residue soil crusher through a tipping bucket truck for crushing, and screening through a screening machine, wherein the screen mesh number of the screening machine is 40 meshes;
s3: conveying the screened arsenic-containing waste residues into a stirrer, adding sodium thiosulfate accounting for 20% of the total sulfur of the arsenic-containing waste residues, incineration fly ash accounting for 15%, coal powder accounting for 15%, rock accounting for 10%, a binder accounting for 10% and a proper amount of water, stirring, blending, and refining;
s4: naturally aging until the water content is 40%, granulating to obtain waste slag particles, and drying the waste slag particles in a drying oven until the water content is 25%;
s5: adding the dried waste slag particles 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 of 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 5-6r/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 below 400 ℃, so that the arsenic oxide gas is solidified to form slag, and separating.
Further, the rock in step S3 is mixed with limestone, powdered sandstone, and pyrite slag in a ratio of 2.
Specifically, the adhesive in the step S3 is bentonite or water glass, the stirrer in the step S3 is a roller stirrer, and the rotating speed of the stirrer is 150r/min.
It should be noted that the particle size of the slag produced by the pelletizer in step S4 is 20mm, and the temperature in the drying oven in 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 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.
The method for cooperatively treating arsenic-containing waste residues by using the rotary kiln in the three embodiments of the invention and the traditional method for treating the arsenic-containing waste residues have the following specific characteristics in terms of pollutant removal rate, treatment time reduction rate and raise dust generation rate as shown in the following table:
| arsenic removal rate/%) | Reduction ratio of processing time% | Dust generation rate/%) | |
| Example 1 | 98.23 | 45.78 | 3.85 |
| Example 2 | 97.71 | 43.39 | 2.15 |
| Example 3 | 98.87 | 44.15 | 2.09 |
| Conventional | 80-85 | Is free of | 30-40 |
The arsenic solid solution principle in the method for cooperatively treating the arsenic-containing waste residue by the rotary kiln 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, metal ions with positive charges and mineral ions with negative charges are fully combined under the high-temperature catalysis action of a system, and then the metal ions and the mineral ions enter the rotary kiln to be calcined, and finally most of arsenic ions replace part of Fe and Al to be distributed in intermediate minerals and are 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 cement clinker can be prepared in the later stage to obtain a cement product, so that the arsenic-containing waste residue is harmlessly placed and the slag meeting the quality requirement can be obtained.
The method for cooperatively treating the arsenic-containing waste residue by the rotary kiln can efficiently remove arsenic in the waste residue, has shorter treatment time and higher efficiency compared with the traditional treatment method, prevents secondary pollution by treating the dust through tail gas, mixes and then proportionally granulates sodium thiosulfate, incineration fly ash, coal powder, rocks, a binder and a proper amount of water, and adds the coal powder to fully combust the arsenic-containing waste residue particles, has small particle size and more thorough combustion, thereby improving the removal rate of arsenic, effectively utilizing the preheating and high-temperature incineration of the rotary kiln to fix the arsenic in clinker, reducing the activity of the arsenic and realizing the thorough harmless disposal of the arsenic-containing waste residue.
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 co-processing arsenic-containing waste residue by a rotary kiln is characterized by comprising the following steps: the method specifically comprises the following steps:
s1: conveying the arsenic-containing waste residues to a residue soil crusher through a tipping bucket truck for crushing, and screening through a screening machine, wherein the screen mesh number of the screening machine is 30-40 meshes;
s3: conveying the screened arsenic-containing waste residues into a stirrer, adding sodium thiosulfate accounting for 15-20% of the total sulfur of the arsenic-containing waste residues, incineration fly ash accounting for 8-15%, coal powder accounting for 8-15%, rock accounting for 6-10%, a binder accounting for 3-10% and a proper amount of water, stirring and blending, and refining after uniform mixing;
s4: naturally aging until the water content is 30-40%, granulating to obtain waste slag particles, and drying the waste slag particles in a drying oven until the water content is 20-25%;
s5: adding the air-dried waste slag particles into a rotary kiln, carrying out tail gas treatment at the tail of the rotary kiln, and introducing hot air flow at 750-800 ℃ from the kiln head to preheat and heat the lumps or pellets in the kiln and carry out pre-reduction 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.
2. The method for the co-disposal of arsenic-containing waste residue by using the rotary kiln as claimed in claim 1, wherein the method comprises the following steps: the rock in the step S3 is prepared by mixing limestone, powdery sandstone and pyrite slag in the proportion of 2.
3. The method for the co-disposal of arsenic-containing waste residue by using the rotary kiln as claimed in claim 1, wherein the method comprises the following steps: the binder in the step S3 is bentonite or water glass.
4. The method for cooperatively treating arsenic-containing waste residue by using the rotary kiln as claimed in claim 1, wherein the method comprises the following steps: in the step S3, the stirrer is a roller stirrer, and the rotating speed of the stirrer is 100-150r/min.
5. The method for the co-disposal of arsenic-containing waste residue by using the rotary kiln as claimed in claim 1, wherein the method comprises the following steps: the particle size of the waste slag particles produced by the granulator in the step S4 is 15-20mm.
6. The method for cooperatively treating arsenic-containing waste residue by using the rotary kiln as claimed in claim 1, wherein the method comprises the following steps: in step S4, the temperature in the drying box is 200-300 ℃.
7. The method for the co-disposal of arsenic-containing waste residue 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-containing waste residue by using the rotary kiln as claimed in 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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| CN202211743543.3A CN115947550A (en) | 2022-12-30 | 2022-12-30 | Method for cooperatively treating arsenic-containing waste residues by using rotary kiln |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103755169A (en) * | 2013-12-27 | 2014-04-30 | 云南省环境科学研究院(中国昆明高原湖泊国际研究中心) | Method for treating arsenic-containing waste residues by using cement rotary kiln |
| CN115325551A (en) * | 2022-09-02 | 2022-11-11 | 湖南博一环保科技有限公司 | Method for cooperatively treating arsenic-containing polluted soil by rotary kiln |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103755169A (en) * | 2013-12-27 | 2014-04-30 | 云南省环境科学研究院(中国昆明高原湖泊国际研究中心) | Method for treating arsenic-containing waste residues by using cement rotary kiln |
| CN115325551A (en) * | 2022-09-02 | 2022-11-11 | 湖南博一环保科技有限公司 | Method for cooperatively treating arsenic-containing polluted soil by rotary kiln |
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