CN114606389A - Efficient and clean secondary aluminum ash harmless treatment method - Google Patents
Efficient and clean secondary aluminum ash harmless treatment method Download PDFInfo
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- CN114606389A CN114606389A CN202210232174.5A CN202210232174A CN114606389A CN 114606389 A CN114606389 A CN 114606389A CN 202210232174 A CN202210232174 A CN 202210232174A CN 114606389 A CN114606389 A CN 114606389A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/04—Working-up slag
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B21/00—Obtaining aluminium
- C22B21/0007—Preliminary treatment of ores or scrap or any other metal source
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B21/00—Obtaining aluminium
- C22B21/0038—Obtaining aluminium by other processes
- C22B21/0069—Obtaining aluminium by other processes from scrap, skimmings or any secondary source aluminium, e.g. recovery of alloy constituents
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
- C22B7/003—Dry processes only remelting, e.g. of chips, borings, turnings; apparatus used therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/005—Separation by a physical processing technique only, e.g. by mechanical breaking
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/02—Working-up flue dust
Abstract
The invention discloses an efficient and clean secondary aluminum ash harmless treatment method, which comprises the following steps: s1, feeding the aluminum ash into a ball mill, feeding the ball-milled materials into a vibrating screen through a feeder, screening out aluminum particles and secondary aluminum ash, and conveying the secondary aluminum ash into an incineration bin pin-barrel furnace through a pipeline; s2, feeding aluminum particles into a rotary furnace to be calcined into aluminum liquid, making the aluminum liquid into aluminum ingots or feeding the aluminum liquid into a homogenizing furnace, conveying bottom slag generated by the rotary furnace back to a ball mill for re-grinding, and conveying fine ash to a incineration bin pin barrel furnace; and S3, adding an alloy material by using the temperature of the molten aluminum after the molten aluminum enters the homogenizing furnace, conveying bottom slag generated by the homogenizing furnace back to the ball mill for use, and conveying fine ash to the incineration bin pin barrel furnace for incineration. According to the efficient and clean secondary aluminum ash harmless treatment method, the aluminum ash is made into effective materials through an improved material process, the residue of hazardous substances is reduced, the environment is protected, meanwhile, partial substances and energy in the treatment process are recycled, the resource consumption is saved, and the method is more in line with the existing environment protection concept.
Description
Technical Field
The invention relates to the technical field of harmless treatment of secondary aluminum ash, in particular to a high-efficiency clean harmless treatment method of secondary aluminum ash.
Background
The aluminum ash is generated in all aluminum melting processes, wherein the aluminum content accounts for about 1-12% of the total loss amount in the aluminum production and use process; in the past, people regard the aluminum slag as waste slag to be dumped, which not only causes the waste of aluminum resources but also brings about environmental problems; therefore, an economic and effective method is found for utilizing and treating the aluminum slag, so that the economic benefit of the aluminum industry is improved, the effective cyclic utilization of resources is realized, and meanwhile, the important influence on the sustainable development of economy and society is generated.
According to statistics, the yield of aluminum ash in China is about 500 ten thousand tons in 2020, and the aluminum ash is increased at a rate of about 2% every year. The aluminum ash contains environment toxic and harmful substances such as fluoride, aluminum nitride, soluble salt and the like, is listed in national hazardous waste records in 2016, belongs to non-ferrous metal smelting waste (HW48), and needs to be disposed according to the relevant requirements of hazardous waste.
Scholars at home and abroad develop a great deal of work around the aluminum ash treatment technology and obtain certain effect, but large-scale industrial application is still not realized. The present comprehensive treatment process of aluminum ash mainly includes extracting metal aluminum, using secondary aluminum ash as water purifying agent, calcium plumbate and accelerating agent, or directly burying. The waste residue produced by the water purifying agent is large in amount and high in harm, the calcium aluminate and the accelerating agent are used as refining agents, the water is used, secondary pollution risks exist in landfill, and a new process and a new technology are provided for comprehensive treatment of aluminum ash through multi-party investigation.
Disclosure of Invention
In order to overcome the problem of difficult treatment of the aluminum ash, the invention aims to provide a high-efficiency clean secondary aluminum ash harmless treatment method which has the function of high-efficiency clean harmless treatment of the aluminum ash.
The invention adopts the following technical scheme for realizing the technical purpose: a high-efficiency clean secondary aluminum ash harmless treatment method comprises the following steps:
s1, feeding the aluminum ash into a ball mill, feeding the ball-milled materials into a vibrating screen through a feeder, screening out aluminum particles and secondary aluminum ash, and conveying the secondary aluminum ash into an incineration bin pin-barrel furnace through a pipeline;
s2, feeding aluminum particles into a rotary furnace to be calcined into aluminum liquid, preparing the aluminum liquid into aluminum ingots or feeding the aluminum liquid into a homogenizing furnace, conveying bottom slag generated by the rotary furnace back to a ball mill to be ground again, and conveying fine ash to a incineration bin pin barrel furnace;
s3, after the molten aluminum enters a homogenizing furnace, adding alloy materials by using the temperature of the molten aluminum to produce an alloy ingot;
conveying the bottom slag generated by the homogenizing furnace back to the ball mill for utilization, and conveying the fine ash to an incineration bin for incineration;
s4, feeding the secondary aluminum ash separated by the ball mill, flue gas and fine ash generated by the rotary furnace and the homogenizing furnace into an incineration bin pin-barrel furnace for combustion;
s5, utilizing an SCR denitration technology outside the incinerator to denitrate smoke discharged by the pin drum incinerator of the incineration bin, and utilizing a bag-type dust remover to remove dust from fine ash discharged by the pin drum incinerator of the incineration bin;
s6, adding limestone into the incineration bin pin barrel furnace, and heating to 840-920 ℃ for desulfurization.
As optimization, the highest temperature in the incineration bin pin tube furnace reaches 1500 ℃, the incineration bin pin tube furnace is designed to be a medium-pressure boiler, the incineration bin pin tube furnace is designed according to 100 tons of generated hot water or steam, the outlet superheated steam pressure can reach 5.4MPa, the steam temperature is 485 ℃, and the electric quantity can be generated by 20 MWH.
As optimization, particulate matters generated in the processes of loading, unloading, crushing, grinding and screening of the aluminum ash are collected by closed negative pressure gas collection, then enter a bag type dust collector for treatment, and are discharged through a high exhaust funnel of 15m, and the discharge concentration meets the requirements of the second-level standard in Table 2 of the Integrated emission Standard of atmospheric pollutants (GB 16297-1996).
As optimization, the secondary aluminum ash silo is used for storing the sorted aluminum ash, waste gas at the top of the silo is treated by a bag-type dust collector and then is discharged through a 15m high-exhaust-gas cylinder, and the discharge concentration meets the requirements of the second-level standard in Table 2 of the Integrated discharge Standard of atmospheric pollutants (GB 16297-1996).
As optimization, the limestone is transported into a limestone silo by a vehicle, generated particulate matters are treated by a bag-type dust collector and then discharged through a high-exhaust duct of 15m, and the discharge concentration meets the requirements of the second-level standard in Table 2 of the Integrated discharge Standard of atmospheric pollutants (GB 16297-1996).
As optimization, the flue gas that rotary kiln, homogeneity stove, burning storehouse round pin tube stove produced includes: particulate matters, sulfur dioxide and nitrogen oxides, wherein waste gas is treated by a denitration system, a bag-type dust remover and a desulfurization system and then is discharged through an exhaust funnel, and the discharge concentration of each pollutant meets the standard requirements of the discharge standards of regenerated copper, aluminum, lead and zinc industrial pollutants (GB 31574-2015).
Preferably, the alloy material in S3 includes copper and magnesium.
The invention has the following beneficial effects:
according to the efficient and clean secondary aluminum ash harmless treatment method, the aluminum ash is made into effective materials through an improved material process, the residue of hazardous substances is reduced, the environment is protected, meanwhile, partial substances and energy in the treatment process are recycled, the resource consumption is saved, and the method is more in line with the existing environment-friendly concept.
Drawings
FIG. 1 is a flow chart of the harmless treatment method of secondary aluminum ash with high efficiency and cleanness.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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.
Examples
Referring to fig. 1, a method for harmless treatment of secondary aluminum ash with high efficiency and cleanness includes the following steps:
s1, feeding the aluminum ash into a ball mill, feeding the ball-milled materials into a vibrating screen through a feeder, screening out aluminum particles and secondary aluminum ash, and conveying the secondary aluminum ash into an incineration bin pin-barrel furnace through a pipeline;
s2, feeding aluminum particles into a rotary furnace to be calcined into aluminum liquid, making the aluminum liquid into aluminum ingots or feeding the aluminum liquid into a homogenizing furnace, conveying bottom slag generated by the rotary furnace back to a ball mill for re-grinding, and conveying fine ash to a incineration bin pin barrel furnace;
s3, after the molten aluminum enters a homogenizing furnace, adding alloy materials by using the temperature of the molten aluminum to produce an alloy ingot;
conveying the bottom slag generated by the homogenizing furnace back to the ball mill for utilization, and conveying the fine ash to an incineration bin for incineration;
s4, feeding the secondary aluminum ash separated by the ball mill, smoke and fine ash generated by the rotary furnace and the homogenizing furnace into an incineration bin pin furnace for combustion;
s5, utilizing an SCR denitration technology outside the incinerator to denitrate smoke discharged by the pin drum incinerator of the incineration bin, and utilizing a bag-type dust remover to remove dust from fine ash discharged by the pin drum incinerator of the incineration bin;
s6, adding limestone into the incineration bin pin barrel furnace, and heating to 840-920 ℃ for desulfurization.
The highest temperature in the incineration bin pin tube furnace reaches 1500 ℃, the incineration bin pin tube furnace is designed to be a medium-pressure boiler, the pressure of outlet superheated steam can reach 5.4MPa according to 100 tons of generated hot water or steam, the steam temperature is 485 ℃, and the electric quantity can be generated to be 20 MWH.
Particulate matters generated in the processes of loading, unloading, crushing, grinding and screening of the aluminum ash are collected by closed negative pressure gas collection, enter a bag type dust collector for treatment and then are discharged through a 15m high-exhaust-gas cylinder, and the discharge concentration meets the requirements of the second-level standard in table 2 of the Integrated emission Standard of atmospheric pollutants (GB 16297-1996).
The secondary aluminum ash silo is used for storing the sorted aluminum ash, waste gas at the top of the silo is treated by a bag-type dust collector and then is discharged through a 15m high-exhaust tube, and the discharge concentration meets the requirements of the secondary standard in table 2 of the comprehensive discharge standard of atmospheric pollutants (GB 16297-1996).
The limestone is transported into a limestone silo by a vehicle, generated particulate matters are treated by a bag-type dust collector and then discharged through a high-exhaust duct with the height of 15m, and the discharge concentration meets the requirements of the second-level standard in table 2 of the Integrated discharge Standard of atmospheric pollutants (GB 16297-1996).
The flue gas that rotary kiln, homogeneity stove, burning storehouse round pin section of thick bamboo stove produced includes: particulate matters, sulfur dioxide and nitrogen oxides, wherein waste gas is treated by a denitration system, a bag-type dust remover and a desulfurization system and then is discharged through an exhaust funnel, and the discharge concentration of each pollutant meets the standard requirements of the discharge standards of regenerated copper, aluminum, lead and zinc industrial pollutants (GB 31574-2015).
The alloy material in S3 includes copper and magnesium.
The process adopts circulating cooling water cooling equipment, is recycled for many times and is not discharged outside.
The project not only treats dangerous waste, but also can generate heat energy and electric energy.
The coal-fired quantity is calculated by 20T/H according to a 100T steam boiler, and the operation is calculated at 7000H in one year, so that the coal-fired quantity can be saved by 140 kT.
Discharge amount of flue gas is 150000m3The emission concentration of each pollutant meets the ultralow emission standard (5 mg/m of particulate matters) of the coal-fired unit by calculation of the/h335mg/m of sulfur dioxide3Nitrogen oxide 50mg/m3) The requirement is that the emission of particulate matters of 5.25T, sulfur dioxide of 36.75T and nitrogen oxides of 52.5T can be reduced every year.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The efficient and clean secondary aluminum ash harmless treatment method is characterized by comprising the following steps:
s1, feeding the aluminum ash into a ball mill, feeding the ball-milled materials into a vibrating screen through a feeder, screening out aluminum particles and secondary aluminum ash, and conveying the secondary aluminum ash into an incineration bin pin-barrel furnace through a pipeline;
s2, feeding aluminum particles into a rotary furnace to be calcined into aluminum liquid, preparing the aluminum liquid into aluminum ingots or feeding the aluminum liquid into a homogenizing furnace, conveying bottom slag generated by the rotary furnace back to a ball mill to be ground again, and conveying fine ash to a incineration bin pin barrel furnace;
s3, after the molten aluminum enters a homogenizing furnace, adding alloy materials by using the temperature of the molten aluminum to produce an alloy ingot;
conveying the bottom slag generated by the homogenizing furnace back to the ball mill for utilization, and conveying the fine ash to an incineration bin for incineration;
s4, feeding the secondary aluminum ash separated by the ball mill, flue gas and fine ash generated by the rotary furnace and the homogenizing furnace into an incineration bin pin-barrel furnace for combustion;
s5, utilizing an SCR denitration technology outside the incinerator to denitrate smoke discharged by the pin drum incinerator of the incineration bin, and utilizing a bag-type dust remover to remove dust from fine ash discharged by the pin drum incinerator of the incineration bin;
s6, limestone is added into the incineration bin pin barrel furnace and heated to 840 ℃ and 920 ℃ for desulfurization.
2. The efficient and clean secondary aluminum ash harmless treatment method according to claim 1, characterized in that: the temperature in the incineration bin pin cylinder furnace can reach 1500 ℃, the incineration bin pin cylinder furnace is designed to be a medium-pressure boiler, the pressure of outlet superheated steam can reach 5.4MPa according to 100 tons of generated hot water or steam, the steam temperature is 485 ℃, and 20MWH of electric quantity can be generated.
3. The efficient and clean secondary aluminum ash harmless treatment method according to claim 1, characterized in that: particulate matters generated during the processes of loading, unloading, crushing, grinding and screening of the aluminum ash are collected by closed negative pressure gas collection, enter a bag type dust collector for treatment and are discharged through a 15m high exhaust funnel.
4. The efficient and clean secondary aluminum ash harmless treatment method according to claim 1, characterized in that: the secondary aluminum ash silo is used for storing the sorted aluminum ash, and waste gas at the top of the silo is treated by a bag-type dust collector and then is discharged through a 15m high exhaust funnel.
5. The efficient and clean secondary aluminum ash harmless treatment method according to claim 1, characterized in that: the limestone is transported to a limestone silo by a vehicle, and generated particulate matters are treated by a bag-type dust collector and then discharged through a 15m high-exhaust funnel.
6. The efficient and clean secondary aluminum ash harmless treatment method according to claim 1, characterized in that: the flue gas that rotary kiln, homogeneity stove, burning storehouse round pin section of thick bamboo stove produced includes: particulate matter, sulfur dioxide, and nitrogen oxides.
7. The efficient and clean secondary aluminum ash harmless treatment method according to claim 1, characterized by comprising the following steps: the alloy material in S3 comprises copper and magnesium.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210232174.5A CN114606389A (en) | 2022-03-09 | 2022-03-09 | Efficient and clean secondary aluminum ash harmless treatment method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115491516A (en) * | 2022-10-26 | 2022-12-20 | 甘肃东兴铝业有限公司 | Method for preparing aluminum-titanium intermediate alloy by extracting metal aluminum from aluminum ash |
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2022
- 2022-03-09 CN CN202210232174.5A patent/CN114606389A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115491516A (en) * | 2022-10-26 | 2022-12-20 | 甘肃东兴铝业有限公司 | Method for preparing aluminum-titanium intermediate alloy by extracting metal aluminum from aluminum ash |
| CN115491516B (en) * | 2022-10-26 | 2023-09-29 | 甘肃东兴铝业有限公司 | Method for preparing aluminum-titanium intermediate alloy by extracting metal aluminum from aluminum ash |
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