CN113897487A - Secondary aluminum production system and method - Google Patents
Secondary aluminum production system and method Download PDFInfo
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- CN113897487A CN113897487A CN202110952626.2A CN202110952626A CN113897487A CN 113897487 A CN113897487 A CN 113897487A CN 202110952626 A CN202110952626 A CN 202110952626A CN 113897487 A CN113897487 A CN 113897487A
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 188
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 188
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims description 14
- 239000002699 waste material Substances 0.000 claims abstract description 65
- 238000005266 casting Methods 0.000 claims abstract description 40
- 238000011282 treatment Methods 0.000 claims abstract description 37
- 238000002844 melting Methods 0.000 claims abstract description 33
- 230000008018 melting Effects 0.000 claims abstract description 33
- 238000007670 refining Methods 0.000 claims abstract description 30
- 239000003973 paint Substances 0.000 claims abstract description 29
- 239000002912 waste gas Substances 0.000 claims abstract description 29
- 238000011084 recovery Methods 0.000 claims abstract description 16
- 238000000576 coating method Methods 0.000 claims abstract description 13
- 239000011248 coating agent Substances 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 43
- 239000000463 material Substances 0.000 claims description 41
- 239000000428 dust Substances 0.000 claims description 23
- 238000002485 combustion reaction Methods 0.000 claims description 21
- 239000007789 gas Substances 0.000 claims description 16
- 238000007885 magnetic separation Methods 0.000 claims description 15
- 239000002918 waste heat Substances 0.000 claims description 15
- 238000010791 quenching Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 13
- 239000004744 fabric Substances 0.000 claims description 12
- 229910000838 Al alloy Inorganic materials 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- 229910000967 As alloy Inorganic materials 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 6
- -1 ferrous metals Chemical class 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 230000000171 quenching effect Effects 0.000 claims description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 4
- 239000003546 flue gas Substances 0.000 claims description 4
- 239000003345 natural gas Substances 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 claims description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 239000003344 environmental pollutant Substances 0.000 claims description 3
- 239000010419 fine particle Substances 0.000 claims description 3
- 229910001385 heavy metal Inorganic materials 0.000 claims description 3
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 claims description 3
- 229910000041 hydrogen chloride Inorganic materials 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 150000002739 metals Chemical class 0.000 claims description 3
- 231100000719 pollutant Toxicity 0.000 claims description 3
- 238000003786 synthesis reaction Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000002372 labelling Methods 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 description 3
- 229910001570 bauxite Inorganic materials 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005338 heat storage 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
- 238000012545 processing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
-
- 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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/005—Preliminary treatment of scrap
-
- 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
- C22B21/06—Obtaining aluminium refining
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Food Science & Technology (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a system and a method for producing secondary aluminum, wherein the system comprises a crushing and sorting system I, a crushing and sorting system II, a paint removing system, a feeding system, a melting system, a refining system, a casting system and a waste gas treatment system; the crushing and sorting system I is connected with the paint removing system, the paint removing system is connected with the feeding system, the crushing and sorting system II is connected with the feeding system, the feeding system is connected with the melting system, the melting system is connected with the refining system, and the refining system is connected with the casting system; the waste gas treatment system is respectively connected with the crushing and sorting system I, the crushing and sorting system II, the paint removing system and the melting system; wherein the removal rate of the coating on the surface of the waste aluminum is more than 99 percent; the use of the waste aluminum pop can is not reduced; the recovery rate of the waste aluminum zip-top can is more than 96 percent; the purity of the sorted waste aluminum pop can is more than 98 percent; the device is safe and environment-friendly, is reasonable in configuration, and can realize continuous and stable operation; advanced crushing technology can realize the continuous operation of the device and simultaneously prolong the service life of equipment.
Description
Technical Field
The invention belongs to the field of waste aluminum recycling, and particularly relates to a system and a method for producing secondary aluminum.
Background
Aluminum is a recyclable resource, and is classified into traditional raw aluminum and secondary aluminum from different raw material sources, the traditional raw aluminum production uses bauxite as a raw material, the bauxite is extracted into aluminum oxide by a chemical method, then liquid electrolytic aluminum (molten aluminum) is obtained by electrolysis, and the molten aluminum is cast into pure aluminum, or a small amount of other components are added to form the aluminum alloy. The regenerated aluminum uses waste aluminum as a raw material, and refers to metal aluminum obtained by at least one-time casting or processing and recovery and treatment, and the existence form of the regenerated aluminum is generally aluminum alloy.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a secondary aluminum production system and a secondary aluminum production method, which are used for solving the following problems:
(1) the problem of coating on the surface of the waste aluminum is solved;
(2) the problem of degraded use of the waste aluminum is solved;
(3) the problem of low recovery rate of the waste aluminum is solved;
(4) the problem of secondary pollution is solved;
(5) the problem of labor cost is solved.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a secondary aluminum production system comprising: the system comprises a crushing and sorting system I, a crushing and sorting system II, a paint removing system, a feeding system, a melting system, a refining system, a casting system and a waste gas treatment system;
the crushing and sorting system I is connected with the paint removing system, the paint removing system is connected with the feeding system, the crushing and sorting system II is connected with the feeding system, the feeding system is connected with the melting system, the melting system is connected with the refining system, and the refining system is connected with the casting system;
the waste gas treatment system is respectively connected with the crushing and sorting system I, the crushing and sorting system II, the paint removing system and the melting system;
the crushing and sorting system I is used for crushing and sorting waste aluminum, and the waste aluminum is easy-to-draw made of waste aluminumThe area of the crushed aluminum sheet is 5-12cm2The purity of the sorted aluminum sheet is more than 98 percent;
the depainting system is used for treating the crushed and sorted aluminum sheets and removing the organic coatings on the aluminum sheets;
the crushing and sorting system II is used for crushing and sorting waste aluminum, the waste aluminum is door and window waste aluminum materials, factory waste aluminum materials and automobile slice waste aluminum materials, the particle size of the crushed waste aluminum is less than 120mm, and the particle size of the sorted aluminum is 5mm-25mm, 25mm-60mm or 60mm-120 mm;
the feeding system is used for feeding and batching;
the melting system is used for melting aluminum to form aluminum liquid;
the refining system is used for adjusting the components and the temperature of the aluminum liquid in the furnace, in order to improve the purity of the aluminum, electrolytic aluminum liquid is added into the refining system, one part of the aluminum liquid treated by the refining system is used as alloy aluminum liquid, and the other part of the aluminum liquid enters the casting system;
the casting system is used for casting aluminum alloy ingots;
the waste gas treatment system is used for treating waste gas generated by the crushing and sorting system I, the crushing and sorting system II, the paint removing system and the melting system.
On the basis of above-mentioned scheme, crushing sorting system I all includes with crushing sorting system II: the device comprises a crusher, a distributing machine, a feeding conveyor, magnetic separation equipment, a vibrating screen, eddy current equipment and X-ray machine separation equipment; the devices are connected through a conveyor belt,
the crusher is used for crushing the waste aluminum and conveying the waste aluminum to the magnetic separation equipment through the feeding conveyor,
the distributing machine is used for uniformly feeding materials on the feeding conveyor, so that the crusher can continuously and stably provide relatively uniform input materials for the magnetic separation equipment,
the magnetic separation equipment is used for separating iron from the materials,
the vibrating screen is used for uniformly distributing materials on a conveyor belt through vibration,
the eddy current equipment is used for separating out nonferrous metals in the material magnetically separated by the magnetic separation equipment,
the X-ray machine sorting equipment is used for sorting out aluminum and other non-ferrous metals in non-ferrous metals.
On the basis of the scheme, the paint removing system comprises: the rotary kiln adopts internal heating, natural gas is adopted for heating, the control temperature of the rotary kiln is 300-500 ℃, an induced draft fan is arranged at the upper part of the rotary kiln, a dust collector is arranged at the lower part of the rotary kiln, the induced draft fan is used for sending waste gas generated in the paint removing treatment process into a waste gas treatment system, and the dust collector is used for recovering ash obtained in the paint removing treatment process.
On the basis of the scheme, the feeding system comprises: a forklift.
On the basis of the scheme, the melting system comprises: the temperature of the double chamber furnace is controlled to be 800-1050 ℃, and the temperature of the aluminum liquid flowing out of the double chamber furnace is 700-780 ℃.
On the basis of the scheme, the refining system comprises: a tilting gas heat preservation furnace.
On the basis of the scheme, the casting system comprises: the chain type ingot casting machine comprises a plurality of chain type ingot casting machines, wherein the same furnace can correspond to the chain type ingot casting machines, and a robot arm is matched with the chain type ingot casting machines for use and used for automatically taking materials, automatically blanking, automatically stacking, weighing, labeling, packaging and the like.
On the basis of the above scheme, the exhaust gas treatment system comprises: the secondary combustion chamber, the quench tower, the waste heat recovery device, the cyclone separator, the cloth bag dust removal device and the chimney;
the secondary combustion chamber is connected with a quench tower, the quench tower is connected with a waste heat recovery device, the waste heat recovery device is connected with a cyclone separator, the cyclone separator is connected with a cloth bag dust removal device, and the cloth bag dust removal device is connected with a chimney;
the secondary combustion chamber is used for carrying out secondary combustion on the waste gas, the temperature of the secondary combustion chamber is 850 ℃, and the retention time of the flue gas is more than 2 s;
the quenching tower is used for cooling the waste gas after secondary combustion, the temperature is reduced to be lower than 200 ℃ within 1s, the secondary synthesis of dioxin is effectively controlled, and the quenching tower has effective washing and absorption effects on heavy metal pollutants such as sulfur dioxide, hydrogen chloride and a small amount of nitrogen oxide in acid gas;
the waste heat recovery device is used for recovering waste heat generated in the waste gas treatment process;
the cyclone separator is used for removing large-particle dust and light materials;
the cloth bag dust removal device is used for further removing fine particle dust.
A production method of secondary aluminum applies the system and comprises the following steps:
step 1, crushing and sorting the waste aluminum pop can, and removing an organic coating on an aluminum sheet after the sorted aluminum sheet is subjected to paint removal treatment;
step 2, crushing and sorting the door and window waste aluminum materials, the factory waste aluminum materials and the automobile slice waste aluminum materials to obtain sorted aluminum, batching the aluminum sheet obtained in the step 1 and the sorted aluminum, and then feeding the aluminum sheet and the sorted aluminum into a double-chamber furnace for melting to form aluminum liquid;
and 3, sending the molten aluminum into a tilting gas holding furnace for refining treatment, wherein the refining treatment comprises the following steps: adjusting the components and temperature of the aluminum liquid in the furnace, adding electrolytic aluminum liquid into the tilting gas heat preservation furnace in order to improve the purity of aluminum, taking one part of the refined aluminum liquid as alloy aluminum liquid, and sending the other part of the refined aluminum liquid into a chain type ingot casting machine for casting treatment to cast an aluminum alloy ingot;
and 4, stacking and inspecting the cast aluminum alloy ingot.
The technical scheme of the invention has the following beneficial effects:
(1) the removal rate of the coating on the surface of the aluminum scrap is more than 99 percent;
(2) the use of the waste aluminum pop can is not reduced;
(3) the recovery rate of the waste aluminum zip-top can is more than 96 percent;
(4) the purity of the sorted waste aluminum pop can is more than 98 percent;
(5) the device is safe and environment-friendly, is reasonable in configuration, and can realize continuous and stable operation;
(6) advanced crushing technology can realize the continuous operation of the device and simultaneously prolong the service life of the equipment.
Drawings
The invention has the following drawings:
FIG. 1 is a schematic diagram of the system of the present invention.
FIG. 2 is a flow chart of the method of the present invention.
Detailed Description
The present invention is described in further detail below with reference to FIGS. 1-2.
As shown in fig. 1, a secondary aluminum production system includes: the system comprises a crushing and sorting system I, a crushing and sorting system II, a paint removing system, a feeding system, a melting system, a refining system, a casting system and a waste gas treatment system;
the crushing and sorting system I is connected with the paint removing system, the paint removing system is connected with the feeding system, the crushing and sorting system II is connected with the feeding system, the feeding system is connected with the melting system, the melting system is connected with the refining system, and the refining system is connected with the casting system;
the waste gas treatment system is respectively connected with the crushing and sorting system I, the crushing and sorting system II, the paint removing system and the melting system;
the crushing and sorting system I is used for crushing and sorting waste aluminum, the waste aluminum is a pop can made of the waste aluminum, and the area of the crushed aluminum sheet is 5-12cm2The purity of the sorted aluminum sheet is more than 98 percent;
the depainting system is used for treating the crushed and sorted aluminum sheets and removing the organic coatings on the aluminum sheets;
the crushing and sorting system II is used for crushing and sorting waste aluminum, the waste aluminum is door and window waste aluminum materials, factory waste aluminum materials and automobile slice waste aluminum materials, the particle size of the crushed waste aluminum is less than 120mm, and the particle size of the sorted aluminum is 5mm-25mm, 25mm-60mm or 60mm-120 mm;
the feeding system is used for feeding and batching;
the melting system is used for melting aluminum to form aluminum liquid;
the refining system is used for adjusting the components and the temperature of the aluminum liquid in the furnace, in order to improve the purity of the aluminum, electrolytic aluminum liquid is added into the refining system, one part of the aluminum liquid treated by the refining system is used as alloy aluminum liquid, and the other part of the aluminum liquid enters the casting system;
the casting system is used for casting aluminum alloy ingots;
the waste gas treatment system is used for treating waste gas generated by the crushing and sorting system I, the crushing and sorting system II, the paint removing system and the melting system.
Broken sorting system I all includes with broken sorting system II: the device comprises a crusher, a distributing machine, a feeding conveyor, magnetic separation equipment, a vibrating screen, eddy current equipment and X-ray machine separation equipment; the devices are connected through a conveyor belt,
the crusher is used for crushing the waste aluminum and conveying the waste aluminum to the magnetic separation equipment through the feeding conveyor,
the distributing machine is used for uniformly feeding materials on the feeding conveyor, so that the crusher can continuously and stably provide relatively uniform input materials for the magnetic separation equipment,
the magnetic separation equipment is used for separating iron from the materials,
the vibrating screen is used for uniformly distributing materials on a conveyor belt through vibration,
the eddy current equipment is used for separating out nonferrous metals in the material magnetically separated by the magnetic separation equipment,
the X-ray machine sorting equipment is used for sorting out aluminum and other non-ferrous metals in non-ferrous metals.
Paint removal system: the main equipment is a rotary kiln, the heating mode of the rotary kiln is internal heating, natural gas is adopted for heating, the rotary kiln is a pyrolysis furnace which directly transfers heat through thermal cycle gas and is used for treating broken aluminum, and the rotary kiln has the greatest advantages of high thermal efficiency and convenience in separation of waste aluminum and organic coatings. The heat source for roasting is hot air of a pyrolysis furnace and heat generated in the carbonization process of the waste aluminum organic coating. When the device is used, the rotary kiln rotates at a certain speed, the organic coating on the surface of the waste aluminum is gradually carbonized at a certain temperature, the materials collide with each other and vibrate due to the rotation of the rotary kiln, and finally the organic coating falls off from the waste aluminum. A part of the detached carbide is collected at one end of the rotary kiln, and the other part is recovered in a dust collector. The control temperature of the rotary kiln is 300-500 ℃.
A melting system: the main equipment is a double-chamber furnace, the control temperature of the double-chamber furnace is 800-1050 ℃, the temperature of the aluminum liquid flowing out of the double-chamber furnace is 700-780 ℃, and the hearth of the double-chamber aluminum melting furnace is divided into a direct heating chamber and an indirect heating chamber. The direct heating chamber is directly heated by the burner, and the indirect heating chamber is indirectly heated by the high-temperature flue gas and the aluminum liquid flowing out of the direct heating chamber.
The double-chamber aluminum melting furnace is mainly characterized in that: the furnace is in reducing atmosphere, and the waste is not in direct contact with flame, so that the oxidation loss is greatly reduced, and the metal burning loss is less; secondly, advanced heat storage technology and waste gas combustion technology are adopted to carry out secondary combustion on waste gas generated during waste material combustion, so that the fuel consumption is greatly reduced, the heat efficiency is high, and the energy consumption is low; and the waste material can be filled in various types and wide range.
A feeding system: the main equipment is a forklift, and the treated waste aluminum is sent to a double-chamber furnace according to the requirement.
A refining system: the main equipment is a tilting gas holding furnace, and the main function is to adjust the components and temperature of the aluminum liquid in the furnace. The method has the advantages that natural gas is selected for heating, the cost is low, the tilting type heat preservation furnace tilts by virtue of the hydraulic device and the control system thereof, and the flow can be automatically controlled in the whole treatment process, so that the flow rate of molten aluminum is stable, the liquid level fluctuation is small, and the ingot casting quality is good.
The casting system comprises: the main equipment is a chain type ingot casting machine, the mechanism of the chain type ingot casting machine is simple, the operation is convenient, the same furnace can correspond to a plurality of chain type ingot casting machines, and the production efficiency can be greatly improved. Meanwhile, the robot arm matched with the chain type ingot casting machine can automatically take materials, automatically discharge materials, automatically stack, weigh, label and pack, fully-automatic production is completely realized, and manpower is greatly reduced.
The exhaust gas treatment system includes: the secondary combustion chamber, the quench tower, the waste heat recovery device, the cyclone separator, the cloth bag dust removal device and the chimney;
the secondary combustion chamber is connected with a quench tower, the quench tower is connected with a waste heat recovery device, the waste heat recovery device is connected with a cyclone separator, the cyclone separator is connected with a cloth bag dust removal device, and the cloth bag dust removal device is connected with a chimney;
the secondary combustion chamber is used for carrying out secondary combustion on the waste gas, the temperature of the secondary combustion chamber is 850 ℃, and the retention time of the flue gas is more than 2 s;
the quenching tower is used for cooling the waste gas after secondary combustion, the temperature is reduced to be lower than 200 ℃ within 1s, the secondary synthesis of dioxin is effectively controlled, and the quenching tower has effective washing and absorption effects on heavy metal pollutants such as sulfur dioxide, hydrogen chloride and a small amount of nitrogen oxide in acid gas;
the waste heat recovery device is used for recovering waste heat generated in the waste gas treatment process;
the cyclone separator is used for removing large-particle dust and light materials;
the cloth bag dust removal device is used for further removing fine particle dust.
As shown in fig. 2, a method for producing secondary aluminum, which applies the system, comprises the following steps:
step 1, crushing and sorting the waste aluminum pop can, and removing an organic coating on an aluminum sheet after the sorted aluminum sheet is subjected to paint removal treatment;
step 2, crushing and sorting the door and window waste aluminum materials, the factory waste aluminum materials and the automobile slice waste aluminum materials to obtain sorted aluminum, batching the aluminum sheet obtained in the step 1 and the sorted aluminum, and then feeding the aluminum sheet and the sorted aluminum into a double-chamber furnace for melting to form aluminum liquid;
and 3, sending the molten aluminum into a tilting gas holding furnace for refining treatment, wherein the refining treatment comprises the following steps: adjusting the components and temperature of the aluminum liquid in the furnace, adding electrolytic aluminum liquid into the tilting gas heat preservation furnace in order to improve the purity of aluminum, taking one part of the refined aluminum liquid as alloy aluminum liquid, and sending the other part of the refined aluminum liquid into a chain type ingot casting machine for casting treatment to cast an aluminum alloy ingot;
and 4, stacking and inspecting the cast aluminum alloy ingot.
Those not described in detail in this specification are within the skill of the art.
Claims (9)
1. A secondary aluminum production system, comprising: the system comprises a crushing and sorting system I, a crushing and sorting system II, a paint removing system, a feeding system, a melting system, a refining system, a casting system and a waste gas treatment system;
the crushing and sorting system I is connected with the paint removing system, the paint removing system is connected with the feeding system, the crushing and sorting system II is connected with the feeding system, the feeding system is connected with the melting system, the melting system is connected with the refining system, and the refining system is connected with the casting system;
the waste gas treatment system is respectively connected with the crushing and sorting system I, the crushing and sorting system II, the paint removing system and the melting system;
the crushing and sorting system I is used for crushing and sorting waste aluminum, the waste aluminum is a pop can made of the waste aluminum, and the area of the crushed aluminum sheet is 5-12cm2The purity of the sorted aluminum sheet is more than 98 percent;
the depainting system is used for treating the crushed and sorted aluminum sheets and removing the organic coatings on the aluminum sheets;
the crushing and sorting system II is used for crushing and sorting waste aluminum, the waste aluminum is door and window waste aluminum materials, factory waste aluminum materials and automobile slice waste aluminum materials, the particle size of the crushed waste aluminum is less than 120mm, and the particle size of the sorted aluminum is 5mm-25mm, 25mm-60mm or 60mm-120 mm;
the feeding system is used for feeding and batching;
the melting system is used for melting aluminum to form aluminum liquid;
the refining system is used for adjusting the components and the temperature of the aluminum liquid in the furnace, in order to improve the purity of the aluminum, electrolytic aluminum liquid is added into the refining system, one part of the aluminum liquid treated by the refining system is used as alloy aluminum liquid, and the other part of the aluminum liquid enters the casting system;
the casting system is used for casting aluminum alloy ingots;
the waste gas treatment system is used for treating waste gas generated by the crushing and sorting system I, the crushing and sorting system II, the paint removing system and the melting system.
2. The secondary aluminum production system as claimed in claim 1, wherein the crushing and sorting system i and the crushing and sorting system ii each comprise: the device comprises a crusher, a distributing machine, a feeding conveyor, magnetic separation equipment, a vibrating screen, eddy current equipment and X-ray machine separation equipment; the devices are connected through a conveyor belt,
the crusher is used for crushing the waste aluminum and conveying the waste aluminum to the magnetic separation equipment through the feeding conveyor,
the distributing machine is used for uniformly feeding materials on the feeding conveyor, so that the crusher can continuously and stably provide relatively uniform input materials for the magnetic separation equipment,
the magnetic separation equipment is used for separating iron from the materials,
the vibrating screen is used for uniformly distributing materials on a conveyor belt through vibration,
the eddy current equipment is used for separating out nonferrous metals in the material magnetically separated by the magnetic separation equipment,
the X-ray machine sorting equipment is used for sorting out aluminum and other non-ferrous metals in non-ferrous metals.
3. The secondary aluminum production system of claim 1, wherein the paint stripping system comprises: the rotary kiln adopts internal heating, natural gas is adopted for heating, the control temperature of the rotary kiln is 300-500 ℃, an induced draft fan is arranged at the upper part of the rotary kiln, a dust collector is arranged at the lower part of the rotary kiln, the induced draft fan is used for sending waste gas generated in the paint removing treatment process into a waste gas treatment system, and the dust collector is used for recovering ash obtained in the paint removing treatment process.
4. The secondary aluminum production system of claim 1, wherein the feed system comprises: a forklift.
5. The secondary aluminum production system of claim 1, wherein the melting system comprises: the temperature of the double chamber furnace is controlled to be 800-1050 ℃, and the temperature of the aluminum liquid flowing out of the double chamber furnace is 700-780 ℃.
6. The secondary aluminum production system of claim 1, wherein the refining system comprises: a tilting gas heat preservation furnace.
7. The secondary aluminum production system of claim 1, wherein the casting system comprises: the chain type ingot casting machine comprises a chain type ingot casting machine body, wherein the same furnace can correspond to a plurality of chain type ingot casting machines, a robot arm is matched with the chain type ingot casting machine body for use, and the robot arm is used for automatically taking materials, automatically discharging, automatically stacking, weighing, labeling and packaging.
8. The secondary aluminum production system of claim 1, wherein the off-gas treatment system comprises: the secondary combustion chamber, the quench tower, the waste heat recovery device, the cyclone separator, the cloth bag dust removal device and the chimney;
the secondary combustion chamber is connected with a quench tower, the quench tower is connected with a waste heat recovery device, the waste heat recovery device is connected with a cyclone separator, the cyclone separator is connected with a cloth bag dust removal device, and the cloth bag dust removal device is connected with a chimney;
the secondary combustion chamber is used for carrying out secondary combustion on the waste gas, the temperature of the secondary combustion chamber is 850 ℃, and the retention time of the flue gas is more than 2 s;
the quenching tower is used for cooling the waste gas after secondary combustion, the temperature is reduced to be lower than 200 ℃ within 1s, the secondary synthesis of dioxin is effectively controlled, and effective washing and absorption effects are achieved on sulfur dioxide, hydrogen chloride and a small amount of nitrogen oxide heavy metal pollutants in the acid gas;
the waste heat recovery device is used for recovering waste heat generated in the waste gas treatment process;
the cyclone separator is used for removing large-particle dust and light materials;
the cloth bag dust removal device is used for further removing fine particle dust.
9. A method for producing secondary aluminum, using the system of any one of claims 1 to 8, comprising the steps of:
step 1, crushing and sorting the waste aluminum pop can, and removing an organic coating on an aluminum sheet after the sorted aluminum sheet is subjected to paint removal treatment;
step 2, crushing and sorting the door and window waste aluminum materials, the factory waste aluminum materials and the automobile slice waste aluminum materials to obtain sorted aluminum, batching the aluminum sheet obtained in the step 1 and the sorted aluminum, and then feeding the aluminum sheet and the sorted aluminum into a double-chamber furnace for melting to form aluminum liquid;
and 3, sending the molten aluminum into a tilting gas holding furnace for refining treatment, wherein the refining treatment comprises the following steps: adjusting the components and temperature of the aluminum liquid in the furnace, adding electrolytic aluminum liquid into the tilting gas heat preservation furnace in order to improve the purity of aluminum, taking one part of the refined aluminum liquid as alloy aluminum liquid, and sending the other part of the refined aluminum liquid into a chain type ingot casting machine for casting treatment to cast an aluminum alloy ingot;
and 4, stacking and inspecting the cast aluminum alloy ingot.
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| WO2023167219A1 (en) * | 2022-03-02 | 2023-09-07 | 株式会社Uacj | Production method for aluminum alloy feedstock, production method for aluminum alloy ingot, production method for aluminum alloy sheet, production method for aluminum alloy substrate for plating, production method for aluminum alloy substrate for magnetic disk, production method for magnetic disk, and magnetic disk |
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