CN110885172A - Method and system for recycling aluminum profile sludge - Google Patents
Method and system for recycling aluminum profile sludge Download PDFInfo
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- CN110885172A CN110885172A CN201911150396.7A CN201911150396A CN110885172A CN 110885172 A CN110885172 A CN 110885172A CN 201911150396 A CN201911150396 A CN 201911150396A CN 110885172 A CN110885172 A CN 110885172A
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- 239000010802 sludge Substances 0.000 title claims abstract description 75
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 53
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004064 recycling Methods 0.000 title claims abstract description 20
- 238000001035 drying Methods 0.000 claims abstract description 60
- 238000001354 calcination Methods 0.000 claims abstract description 50
- 239000000843 powder Substances 0.000 claims abstract description 40
- 239000007789 gas Substances 0.000 claims abstract description 25
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 238000006115 defluorination reaction Methods 0.000 claims abstract description 21
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 21
- 230000023556 desulfurization Effects 0.000 claims abstract description 21
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000011737 fluorine Substances 0.000 claims abstract description 18
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 18
- 239000011593 sulfur Substances 0.000 claims abstract description 18
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 18
- 239000002912 waste gas Substances 0.000 claims abstract description 18
- 239000000047 product Substances 0.000 claims abstract description 16
- 238000003860 storage Methods 0.000 claims abstract description 14
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 12
- 239000000725 suspension Substances 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000003837 high-temperature calcination Methods 0.000 claims abstract description 10
- 238000004806 packaging method and process Methods 0.000 claims abstract description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000006227 byproduct Substances 0.000 claims abstract description 7
- 150000001875 compounds Chemical class 0.000 claims abstract description 5
- 239000013078 crystal Substances 0.000 claims abstract description 5
- 230000005496 eutectics Effects 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 5
- 238000000746 purification Methods 0.000 claims abstract description 5
- 239000002351 wastewater Substances 0.000 claims abstract description 5
- 239000000446 fuel Substances 0.000 claims description 18
- 238000010521 absorption reaction Methods 0.000 claims description 12
- 239000002283 diesel fuel Substances 0.000 claims description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 12
- 238000002360 preparation method Methods 0.000 claims description 9
- 239000000428 dust Substances 0.000 claims description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 7
- 239000003546 flue gas Substances 0.000 claims description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 6
- 239000002028 Biomass Substances 0.000 claims description 6
- 239000003034 coal gas Substances 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 239000003345 natural gas Substances 0.000 claims description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- 230000002745 absorbent Effects 0.000 claims description 5
- 239000002250 absorbent Substances 0.000 claims description 5
- 239000000292 calcium oxide Substances 0.000 claims description 4
- 235000012255 calcium oxide Nutrition 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 235000019738 Limestone Nutrition 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- 229910021529 ammonia Inorganic materials 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000003814 drug Substances 0.000 claims description 3
- 239000006028 limestone Substances 0.000 claims description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims 4
- 229910000838 Al alloy Inorganic materials 0.000 claims 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 abstract description 14
- 239000004411 aluminium Substances 0.000 abstract 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 239000002699 waste material Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 229910001610 cryolite Inorganic materials 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000010436 fluorite Substances 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- ABTOQLMXBSRXSM-UHFFFAOYSA-N silicon tetrafluoride Chemical group F[Si](F)(F)F ABTOQLMXBSRXSM-UHFFFAOYSA-N 0.000 description 2
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- WMWXXXSCZVGQAR-UHFFFAOYSA-N dialuminum;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3] WMWXXXSCZVGQAR-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
- C02F2101/14—Fluorine or fluorine-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
A method and system for reclaiming the sludge of aluminium shapes features that the wet sludge containing a certain amount of water is fed to suspension circulating baking and breaking system by feeding system to prepare dry powder for temporary storage. And metering the dry powder and feeding the dry powder into a calcining system for calcining. In the calcining process, sulfur and fluorine in the sludge enter calcining tail gas in the form of gaseous compounds, and the tail gas is sent into a drying system through an induced draft fan to be used for drying wet sludge; heavy metals in the sludge are solidified and melted in the eutectic crystal lattice at high temperature, so that the purification of the aluminum profile sludge is realized. And after high-temperature calcination, the high-alumina powder is cooled by a cooling system and then is sent to a finished product system for storage or packaging, and bulk shipment. And tail gas exhausted by the drying system is introduced into the desulfurization and defluorination system by the draught fan and is exhausted after reaching the standard. Wet materials of the desulfurization and defluorination byproducts obtained by waste gas treatment are prepared into dry powder through a suspension state circulating drying and scattering system, and then are used as fluorine resource and sulfur resource products; a small amount of waste water generated by waste gas treatment is discharged after reaching the standard through water treatment. Thereby realizing the full recycling of the aluminum profile sludge.
Description
Technical Field
The invention belongs to the technical field of solid waste disposal and resource utilization, and particularly relates to a method and a system for full recycling of aluminum profile sludge.
Background
During the degreasing, acid etching, alkali etching, neutralization, anodic oxidation, coloring, hole sealing and spraying treatment processes of the aluminum profile, a large amount of waste liquid generated is subjected to preliminary filter pressing treatment to form wet sludge with the water content higher than 80% and high viscosity. According to statistics, the national aluminum profile yield is up to 4845.52 ten thousand tons only in 2014, and generally, each ton of profile can produce 0.05 ton of sludge, namely, about 242.26 ten thousand tons of sludge are produced every year, and the production quantity of the sludge is continuously increased along with the development of the domestic building market. The aluminum profile sludge contains a certain amount of heavy metals and has leaching toxicity, and the aluminum profile sludge is easy to cause damage to organisms, water bodies and soil, which is difficult to repair, after being exposed in the environment for a long time. The current mainstream treatment mode is mainly chelating and burying, and the principle of reduction, harmlessness and resource utilization cannot be realized without analyzing and treating by using technical means.
The chemical components of the dried aluminum profile sludge show that the content of aluminum oxide is about 65-80%, the content of conventional silicon oxide, calcium oxide, iron oxide and the like is about 18-33%, the balance is a small amount of impurities and heavy metals, the mineral form is low-crystalline aluminum oxide hydrate and a part of amorphous bodies, the particle size is very small, the specific surface area is large, the activity is very high, and the resource utilization potential is huge.
One of the dangerous characteristics of part of the aluminum profile sludge is that the aluminum profile sludge contains certain heavy metals and has certain leaching toxicity, which not only causes higher disposal cost, but also causes difficulty in resource utilization.
The second dangerous characteristic of part of the aluminum profile sludge is that the aluminum profile sludge contains higher fluorine and sulfur, and the fluorine is silicon tetrafluoride (SiF) in the process of calcining, calcining and solidifying heavy metals at high temperature4) In the form of a gas of (1), sulfur being predominantly SOxThe tail gas enters the calcining furnace and is discharged along with the hot flue gas. The fluorine-containing sulfur-containing gas not only has strong corrosivity and causes a certain resource waste while causing serious environmental pollution.
The aluminum profile sludge is reasonably recycled and recycled, waste is changed into valuable, green recycling of resources is achieved, the current situation of aluminum profile sludge disposal can be improved, the aluminum profile industrial structure is upgraded, the aluminum mine resource utilization pattern in China is improved, and the method has important environmental protection and economic significance.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the method and the system for fully recycling the aluminum profile sludge, and the method and the system have the characteristics of reliable technical route, complete sludge recycling, environment-friendly and energy-saving process, flexible final product and strong market adaptability.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for recycling aluminum profile sludge comprises the following steps:
the first step is as follows: drying wet sludge containing certain moisture from an aluminum profile factory in a drying system;
the second step is that: the dried aluminum profile sludge enters a dust collection system along with the drying waste gas to be collected to prepare dry powder, and the dry powder is conveyed into a cache bin for caching by a conveying system;
the third step: feeding the sludge dry powder in the buffer bin into a high-temperature calcining system for calcining, removing impurities and solidifying heavy metals in the calcining process, and cooling the calcined clinker powder and then sending the cooled clinker powder to a finished product system to be used as a finished product of the high-alumina powder for storage, packaging or bulk shipment;
the fourth step: high-temperature tail gas exhausted by the high-temperature calcination system is used as part of heat source of the drying system and is introduced by a draught fan, and all the high-temperature tail gas is used for drying wet mud;
the fifth step: introducing exhaust gas discharged by the drying system into a desulfurization and defluorination system through an induced draft fan, and recovering fluorine and sulfur in the exhaust gas;
and a sixth step: the flue gas purified by the fluorine and sulfur recovery system meets the national emission standard, the flue gas is led out of the system by a draught fan and is discharged into the atmosphere, and a small amount of waste water generated by waste gas treatment is discharged after reaching the standard through water treatment.
And in the third step of calcining, sulfur and fluorine in the sludge enter calcining tail gas in the form of gaseous compounds, the tail gas is sent into a drying system through an induced draft fan to be used for drying wet sludge, and heavy metals in the sludge are solidified and melted in a eutectic crystal lattice at high temperature, so that the purification of the aluminum profile sludge is realized.
And thirdly, cooling the aluminum profile sludge dry powder calcined at high temperature by a cooling system, and conveying the cooled aluminum profile sludge dry powder into a finished product system by conveying equipment to be used as a finished product high-alumina powder for storage or packaging and bulk shipment.
And fifthly, dispersing and drying wet materials such as villiaumite, sulfate and the like obtained by desulfurization and defluorination by a suspension state circulating drying and scattering system to obtain dry powder byproducts for storage or packaging, bulk distribution and transportation. Depending on the absorbent used, the by-products of fluorite powder, hydrofluoric acid, cryolite intermediate, desulfurized gypsum, sulfuric acid, etc. can be obtained by desulfurization and defluorination.
The hot air temperature of the drying system is 80-600 ℃, and the high-temperature calcination temperature is 800-1300 ℃.
The invention also provides a system for recycling the aluminum profile sludge, which comprises the following steps:
the drying system is used for drying wet sludge containing certain moisture from an aluminum profile factory;
the dust collecting system is connected with the drying system and used for collecting dried aluminum profile sludge and dust in the drying waste gas to obtain sludge dry powder;
the caching storage bin caches the sludge dry powder;
the calcining system is connected with the cache bin and is used for carrying out high-temperature calcination on the cache bin, and a high-temperature tail gas outlet of the calcining system is connected to the drying system through an induced draft fan to serve as a part of heat source;
the cooling system is connected with the calcining system and used for cooling the calcined product;
and the desulfurization and defluorination system is connected with the waste gas outlet of the drying system to recover fluorine and sulfur in the waste gas.
The drying system is a suspended state circulating drying scattering system of patent No. CN207600116U, the calcining system is a rotary kiln calcining system, a suspended state calcining system, a circulating fluidized bed calcining system or other high-temperature calcining systems, and the cooling system is a multi-stage cyclone cooling cylinder, a single cylinder cooler, a grate cooler or other cooling systems.
The desulfurization and defluorination system mainly comprises an absorption unit and a desulfurization and defluorination agent preparation system, wherein the absorption unit is a multi-stage water absorption tower, a multi-stage chemical absorption tower or a series and parallel combination thereof for absorbing used medicine limestone, quicklime and Ca (OH)2NaOH, ammonia or other absorbents.
The calcining system is provided with a combustion system in a matching way, and the fuel used for the combustion system can be light diesel oil, heavy diesel oil, natural gas, coal gas, biomass fuel and other fuels.
The drying system is matched with a hot air preparation system, and the fuel used for the hot air preparation system can be light diesel oil, heavy diesel oil, natural gas, coal gas, biomass fuel and other fuels.
Compared with the prior art, the invention has the beneficial effects that:
1) the aluminum profile sludge is completely recycled, the discharge and disposal cost of hazardous waste is reduced, the consumption of original aluminum resources is reduced, and the resource and ecological environment protection in China is facilitated.
2) The process is mature and reliable, and no secondary pollution is generated in the production process.
3) The product quality is good, and the market demand is effectively filled.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
As shown in fig. 1, a system for recycling aluminum profile sludge mainly comprises a drying system, a dust collecting system, a buffer storage bin, a calcining system, a cooling system, a desulfurization and defluorination system, and the like, and the process flow is as follows:
the first step is as follows: drying wet sludge containing certain moisture from an aluminum profile factory in a drying system, wherein the drying system can adopt a suspension state circulating drying and scattering system with the patent number of CN207600116U, the drying system is provided with a hot air preparation system in a matching way, and fuels used for the hot air preparation system can be light diesel oil, heavy diesel oil, natural gas, coal gas, biomass fuel and other fuels;
the second step is that: the dried aluminum profile sludge enters a dust collection system along with the drying waste gas to be collected to prepare dry powder, and the dry powder is conveyed into a cache bin for caching by a conveying system;
the third step: feeding the sludge dry powder in the buffer bin into a high-temperature calcining system for calcining, removing impurities and solidifying heavy metals in the calcining process, enabling sulfur and fluorine in the sludge to enter calcining tail gas in the form of gaseous compounds, solidifying and melting the heavy metals in the sludge in a eutectic crystal lattice at high temperature, the purification of the aluminum profile sludge is realized, the calcined clinker powder is sent into a finished product system by a conveying device after being cooled to be used as a finished product of the high-alumina powder for storage, packaging or bulk shipment, wherein the calcining system can be a rotary kiln calcining system, a suspension state calcining system, a circulating fluidized bed calcining system or other high-temperature calcining systems, the calcining system is provided with a combustion system in a matching way, the fuel used for the combustion system can be light diesel oil, heavy diesel oil, natural gas, coal gas, biomass fuel and other fuels, and the cooling system can be a multi-stage cyclone cooling cylinder, a single-cylinder cooler, a grate cooler or other cooling systems;
the fourth step: introducing high-temperature tail gas exhausted by the high-temperature calcination system as a partial heat source of the drying system by an induced draft fan, and completely drying wet mud, wherein the hot air temperature of the drying system is 80-600 ℃, and the high-temperature calcination temperature is 800-1300 ℃;
the fifth step: the waste gas discharged by the drying system is introduced into a desulfurization and defluorination system by an induced draft fan to recover fluorine and sulfur in the waste gas, and the desulfurization and defluorination system mainly comprises an absorption unit and a desulfurization and defluorination agent preparation system groupThe absorption unit can be a multi-stage water absorption tower, a multi-stage chemical absorption tower or a series and parallel combination thereof, and absorbs the used medicine limestone, quicklime, Ca (OH)2NaOH, ammonia or other absorbents; wet materials such as villiaumite, sulfate and the like obtained by desulfurization and defluorination are scattered and dried by a suspension state circulating drying scattering system to prepare dry powder byproducts for storage or packaging for bulk transportation, and the byproducts such as fluorite powder, hydrofluoric acid, cryolite intermediate products, desulfurized gypsum, sulfuric acid and the like can be prepared by desulfurization and defluorination according to different used absorbents;
and a sixth step: the flue gas purified by the fluorine and sulfur recovery system meets the national emission standard, the flue gas is led out of the system by a draught fan and is discharged into the atmosphere, and a small amount of waste water generated by waste gas treatment is discharged after reaching the standard through water treatment.
In summary, in the invention, wet sludge containing certain moisture generated by an aluminum profile factory is fed into a suspension state circulating drying and scattering system through a feeding system to be prepared into dry powder for temporary storage. The dry powder is fed into a calcining system for calcining by a conveying device after being metered. In the calcining process, sulfur and fluorine in the sludge enter calcining tail gas in the form of gaseous compounds, and the tail gas is sent into a drying system through an induced draft fan to be used for drying wet sludge; heavy metals in the sludge are solidified and melted in the eutectic crystal lattice at high temperature, so that the purification of the aluminum profile sludge is realized. After high-temperature calcination, the high-alumina powder is cooled by a cooling system and then is sent to a finished product system by a conveying device for storage or packaging and bulk distribution. And tail gas exhausted by the drying system is introduced into the desulfurization and defluorination system by the draught fan and is exhausted after reaching the standard. Wet materials of the desulfurization and defluorination byproducts obtained by waste gas treatment and recovery are prepared into dry powder by a suspension state circulating drying and scattering system, and then are sold as fluorine resource and sulfur resource products; a small amount of waste water generated by waste gas treatment is discharged after reaching the standard through water treatment. Thereby realizing the full recycling of the aluminum profile sludge.
Claims (10)
1. The method for recycling the aluminum profile sludge is characterized by comprising the following steps of:
the first step is as follows: drying wet sludge containing certain moisture from an aluminum profile factory in a drying system;
the second step is that: the dried aluminum profile sludge enters a dust collection system along with the drying waste gas to be collected to prepare dry powder, and the dry powder is conveyed into a cache bin for caching by a conveying system;
the third step: feeding the sludge dry powder in the buffer bin into a high-temperature calcining system for calcining, removing impurities and solidifying heavy metals in the calcining process, and cooling the calcined clinker powder and then sending the cooled clinker powder to a finished product system to be used as a finished product of the high-alumina powder for storage, packaging or bulk shipment;
the fourth step: high-temperature tail gas exhausted by the high-temperature calcination system is used as part of heat source of the drying system and is introduced by a draught fan, and all the high-temperature tail gas is used for drying wet mud;
the fifth step: introducing exhaust gas discharged by the drying system into a desulfurization and defluorination system through an induced draft fan, and recovering fluorine and sulfur in the exhaust gas;
and a sixth step: the flue gas purified by the fluorine and sulfur recovery system meets the national emission standard, the flue gas is led out of the system by a draught fan and is discharged into the atmosphere, and a small amount of waste water generated by waste gas treatment is discharged after reaching the standard through water treatment.
2. The method for fully recycling the aluminum profile sludge according to claim 1, wherein in the third step of calcining, sulfur and fluorine in the sludge enter calcining tail gas in the form of gaseous compounds, the tail gas is sent into a drying system through an induced draft fan for wet sludge drying, and heavy metals in the sludge are solidified and melted in a eutectic crystal lattice at high temperature, so that the purification of the aluminum profile sludge is realized.
3. The method for fully recycling the aluminum profile sludge according to claim 1, wherein in the third step, the aluminum profile sludge dry powder calcined at high temperature is cooled by a cooling system and then is conveyed to a finished product system by a conveying device to be stored or packaged as finished high-alumina powder for bulk shipment.
4. The method for fully recycling the aluminum profile sludge according to claim 1, wherein in the fifth step, wet materials such as villaumite and sulfate obtained by desulfurization and defluorination are scattered and dried by a suspension state circulating drying and scattering system to obtain dry powder byproducts for storage or packaging and bulk transportation.
5. The method for recycling the aluminum profile sludge according to claim 1, wherein the hot air temperature of the drying system is 80-600 ℃, and the high-temperature calcination temperature is 800-1300 ℃.
6. The utility model provides a system of full resource of aluminium alloy mud which characterized in that includes:
the drying system is used for drying wet sludge containing certain moisture from an aluminum profile factory;
the dust collecting system is connected with the drying system and used for collecting dried aluminum profile sludge and dust in the drying waste gas to obtain sludge dry powder;
the caching storage bin caches the sludge dry powder;
the calcining system is connected with the cache bin and is used for carrying out high-temperature calcination on the cache bin, and a high-temperature tail gas outlet of the calcining system is connected to the drying system through an induced draft fan to serve as a part of heat source;
the cooling system is connected with the calcining system and used for cooling the calcined product;
and the desulfurization and defluorination system is connected with the waste gas outlet of the drying system to recover fluorine and sulfur in the waste gas.
7. The system for fully recycling aluminum profile sludge according to claim 6, wherein the drying system is a suspension state circulating drying scattering system of patent No. CN207600116U, the calcining system is a rotary kiln calcining system, a suspension state calcining system, a circulating fluidized bed calcining system or other high-temperature calcining systems, and the cooling system is a multi-stage cyclone cooling cylinder, a single cylinder cooler, a grate cooler or other cooling systems.
8. The system for recycling aluminum profile sludge according to claim 6, wherein the desulfurization and defluorination system mainly comprises an absorption unit and a desulfurization and defluorination agent preparation system, wherein the absorption unit is a multistage water absorption tower, a multistage chemical absorption tower or a series and parallel combination thereof, and is used for absorbing used medicine limestone, quicklime, Ca (OH)2NaOH, ammonia or other absorbents.
9. The system for recycling the aluminum profile sludge according to claim 6, wherein the calcining system is provided with a combustion system, and the fuel used for the combustion system can be light diesel oil, heavy diesel oil, natural gas, coal gas, biomass fuel and other fuels.
10. The system for recycling aluminum profile sludge according to claim 6, wherein the drying system is provided with a hot air preparation system, and the fuel used for the hot air preparation system can be light diesel oil, heavy diesel oil, natural gas, coal gas, biomass fuel and other fuels.
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