A waste gas treatment system for waste aluminum smelting and casting system

Abstract

The present application discloses a waste gas treatment system for a waste aluminum smelting system, which relates to the field of waste gas treatment. The waste gas treatment system for a waste aluminum smelting system includes a main body module, which is cast by concrete, and includes a gravity settling chamber, a filter chamber and a clean air chamber arranged in sequence from bottom to top; an air intake module, which transports the waste gas to the gravity settling chamber for pre-sedimentation; a filter module, which includes a filter body and a filter chamber, and the filter body is installed in the filter chamber, and the filter chamber is used to accommodate the purified gas after filtering; the filter chamber and the filter chamber are separated by the filter body, and the filter chamber is connected to the clean air chamber; an air outlet module, which transports the purified gas in the clean air chamber to the atmosphere. In the present application, the main body module in the waste gas treatment system is cast by concrete, and the volume of the waste gas treatment system can be designed according to actual needs, without considering the difficulty of transporting the waste gas treatment system, and is particularly suitable for large-scale waste gas treatment systems.

Description

Technical Field

[0001] The invention relates to the field of waste gas treatment, and in particular to a waste gas treatment system for a waste aluminum smelting and casting system. Background Art

[0002] During the smelting and utilization of scrap aluminum, fine aluminum ash will float into the air with the high-temperature airflow. If it is not cleaned up in time, it will easily cause serious air pollution. At present, in the relevant technology, it is usually necessary to use a waste gas treatment system to treat the waste gas generated during the smelting and casting of scrap aluminum.

[0003] Among them, the waste gas treatment system is usually a pulse dust removal system, including a main module, an air intake module, a filter module, an air outlet module, a pulse spray module and an aluminum slag collection module. The main module includes a filter chamber and a clean air chamber, which is usually a metal stainless steel structure. The air intake module transports the waste gas into the filter chamber. The filter module is installed in the filter chamber to filter and purify the waste gas. The purified waste gas passes through the clean air chamber and is exhausted into the atmosphere by the air outlet module. The pulse spray module regularly sprays the aluminum slag attached to the outer wall of the filter module into the aluminum slag collection module, which can realize the recycling and reuse of the aluminum slag and ensure the purification effect of the waste gas treatment system.

[0004] Taking into account the transportation and service life of the waste gas treatment system, the waste gas treatment system in the current related technology is usually a metal stainless steel structure with a small size, which is not suitable for waste gas treatment in waste aluminum smelting systems with large processing volumes. Summary of the invention

[0005] In order to improve the problem that the waste gas treatment system in the related art is small in size and processing capacity and is not suitable for waste gas treatment of waste aluminum smelting systems with large processing capacity, the present application provides a waste gas treatment system for a waste aluminum smelting system.

[0006] The waste gas treatment system for a waste aluminum smelting and casting system provided in this application adopts the following technical solution:

[0007] A waste gas treatment system for a waste aluminum smelting and casting system, comprising:

[0008] The main body module is cast by concrete and includes a gravity settling chamber, a filter chamber and a clean air chamber arranged in sequence from bottom to top, and the clean air chamber is separated from the gravity settling chamber and the filter chamber;

[0009] An air intake module, wherein the air intake module transports the waste gas generated during the aluminum slag casting process to the gravity settling chamber for pre-sedimentation; a filter module, wherein the filter module comprises a filter body and a filter chamber, wherein the filter body is installed in the filter chamber, and the filter chamber is used to accommodate the purified gas after filtering; wherein the filter chamber and the filter chamber are separated by the filter body, and the filter chamber is communicated with the clean air chamber;

[0010] An air outlet module is used to transport the purified gas in the clean air chamber into the atmosphere.

[0011] In this application, what is different from the waste gas treatment system in the related art is that the main module in the waste gas treatment system is made of cast concrete, and the size of the waste gas treatment system can be designed according to actual needs without considering the difficulty of transporting the waste gas treatment system. It is especially suitable for large-scale waste gas treatment systems.

[0012] Optionally, the air intake module includes an air intake pipe, which is provided with an air inlet and an air outlet, the air inlet of the air intake pipe is connected to the exhaust module of the waste aluminum smelting system, and the air outlet of the air intake pipe is located on the side where the air intake pipe is connected to the gravity sedimentation chamber; wherein the area of ​​the longitudinal section of the air intake pipe gradually decreases in the direction away from the air inlet of the air intake pipe.

[0013] In the present application, the area of ​​the longitudinal section of the intake duct gradually decreases in the direction away from the air inlet of the intake duct, which can increase the friction of the exhaust gas entering the intake duct, reduce the flow rate of the exhaust gas, and facilitate the pre-sedimentation of large particles of aluminum slag in the exhaust gas in the gravity settling chamber.

[0014] Optionally, the exhaust gas treatment system further includes:

[0015] A pulse spray module, the pulse spray module is used to periodically perform pulse spraying on the filter body to remove aluminum slag accumulated on the outer peripheral side of the filter body;

[0016] A collecting module is located below the gravity settling chamber and is used to collect the aluminum slag sprayed from the filter body.

[0017] In this application, after the filter body is used for a long time, a layer of aluminum slag will be attached to the outer peripheral side of the filter body. If not treated, it will affect the purification efficiency of the filter body. Using a pulse spray module to regularly spray the filter body is beneficial to ensure the ventilation effect of the filter body.

[0018] Optionally, the pulse jet module includes an air compression device and a pulse jet structure, the air compression device provides compressed air to the pulse jet structure, the pulse jet structure sprays compressed air into the filter cavity, and the compressed air blows the aluminum slag attached to the outer wall of the filter body into the gravity sedimentation chamber.

[0019] In the present application, the aluminum slag on the outer wall of the filter body is removed by compressed air provided by an air compression device, which can avoid secondary dust and is beneficial to improving the cleaning efficiency of the filter body.

[0020] Optionally, the concrete used in the main module includes the following components in parts by weight:

[0021] Cement: 300-450 parts;

[0022] Fly ash: 100-150 parts;

[0023] Coarse aggregate: 755-785 parts;

[0024] Aluminum slag: 175-245 parts;

[0025] Fine aggregate: 400-450 parts;

[0026] Water reducing agent: 4-8 parts;

[0027] Silicone modified acrylic emulsion: 35-45 parts;

[0028] Water: 165-175 parts.

[0029] The concrete used in the main module of this application uses part of aluminum slag to replace the coarse aggregate, and adds silicone modified acrylic emulsion, wherein the role of the silicone modified acrylic emulsion is to modify the aluminum slag and improve the problem of reduced corrosion resistance of concrete caused by aluminum slag replacing coarse aggregate. On the one hand, it effectively utilizes the waste resource aluminum slag, and on the other hand, it is conducive to obtaining concrete with good corrosion resistance and can be used for a long time in an open-air environment, which plays an important role in improving the service life of the main module in the exhaust gas treatment system.

[0030] Optionally, the water reducer includes a polycarboxylate water reducer and sodium lignin sulfonate, and the weight ratio of the polycarboxylate water reducer to the sodium lignin sulfonate is (3-4):1.

[0031] In the present application, the water reducer adopts a composition in which the weight ratio of the polycarboxylate water reducer and the sodium lignin sulfonate is within the range of (3-4):1, which is beneficial to the dispersibility of the modified aluminum slag in the cement slurry and has a further improvement effect on improving the performance of the concrete.

[0032] Optionally, the coarse aggregate is crushed stone with a continuous grading of 5-12 mm.

[0033] In the present application, the coarse aggregate is crushed stone with a continuous gradation of 5-12 mm, which helps to form a more uniform concrete structure and improve the overall strength of the concrete.

[0034] Optionally, the fine aggregate is fine sand with a fineness modulus of 2.4-2.8.

[0035] In the present application, fine aggregate adopts fine sand with a fineness modulus of 2.4-2.8, which helps to improve the bonding force and cohesion of concrete and can further improve the overall strength of concrete.

[0036] Optionally, the preparation of the concrete includes an aluminum slag modification process and a concrete preparation process, wherein the aluminum slag modification process includes the following steps:

[0037] Evenly mix 10-20 wt% of cement and 10-20 wt% of water to obtain a bonding slurry;

[0038] Aluminum slag is added to the bonding slurry, stirred evenly, poured into a mold, dried, formed, and then crushed to prepare pretreated aluminum slag with a particle size range of 5-12 mm;

[0039] The pretreated aluminum slag is put into the organosilicon-modified acrylic emulsion and stirred. Then, the pretreated aluminum slag is separated from the organosilicon-modified acrylic emulsion and dried to obtain modified aluminum slag with a moisture content of less than 0.1%.

[0040] In the aluminum slag modification process of the present application, the aluminum slag is first pre-modified with a bonding slurry made of cement and water, and then modified with an organic silicon modified acrylic emulsion, and the water content of the modified aluminum slag is controlled to be less than 0.1%, which is conducive to obtaining corrosion-resistant concrete with low chloride ion migration coefficient, low steel bar corrosion weight loss rate and good sulfate corrosion resistance. And the corrosion resistance of the concrete is equivalent to that of the concrete without aluminum slag, which not only effectively utilizes the aluminum slag, but also obtains concrete with good corrosion resistance and can be used for a long time in an open-air environment, which has a further improvement effect on improving the service life of the main module in the exhaust gas treatment system.

[0041] Optionally, the concrete preparation process includes the following steps:

[0042] uniformly mixing the water reducing agent with the remaining water to obtain an admixture solution;

[0043] uniformly mixing the remaining cement, fly ash and admixture solution to obtain cement slurry;

[0044] The coarse aggregate, fine aggregate and modified aluminum slag are added into cement slurry and mixed evenly to obtain concrete.

[0045] In the present application, a water reducer is first mixed with water to prepare an admixture solution, cement, fly ash and the admixture solution are then mixed to prepare cement slurry, and finally coarse aggregate, fine aggregate and modified aluminum slag are added to the cement slurry to prepare concrete, which is beneficial to the uniform dispersion of the raw materials in the concrete and can improve the production stability of the concrete.

[0046] In summary, this application at least includes the following beneficial technical effects:

[0047] (1) In the present application, the main module of the exhaust gas treatment system is made of cast concrete, and the size of the exhaust gas treatment system can be designed according to actual needs without considering the difficulty of transporting the exhaust gas treatment system. It is particularly suitable for large-scale exhaust gas treatment systems.

[0048] (2) The area of ​​the longitudinal section of the air intake duct gradually decreases in the direction away from the air inlet of the air intake duct, which can increase the friction of the exhaust gas entering the air intake duct and reduce the flow rate of the exhaust gas, which is beneficial to the pre-sedimentation of large particles of aluminum slag in the exhaust gas in the gravity settling chamber.

[0049] (3) The concrete used in the main module of this application uses part of aluminum slag to replace the coarse aggregate, and adds silicone-modified acrylic emulsion, wherein the role of the silicone-modified acrylic emulsion is to modify the aluminum slag and improve the problem of reduced corrosion resistance of concrete caused by the replacement of coarse aggregate with aluminum slag. On the one hand, it effectively utilizes the waste resource aluminum slag, and on the other hand, it is conducive to obtaining concrete with good corrosion resistance and can be used for a long time in an open-air environment, which plays an important role in improving the service life of the main module in the exhaust gas treatment system.

[0050] (4) In the present application, the aluminum slag is pre-modified with a bonding slurry made of cement and water, and then the aluminum slag is modified with a silicone-modified acrylic emulsion. After the water content of the modified aluminum slag is controlled to be lower than 0.1%, the modified aluminum slag is combined with other raw materials to prepare concrete. The corrosion resistance of the obtained concrete is equivalent to that of the concrete without the addition of aluminum slag. The aluminum slag is effectively utilized, and the concrete with good corrosion resistance and capable of being used for a long time in an open-air environment is obtained, which further improves the service life of the main module in the exhaust gas treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a top view of the exhaust gas treatment system of the present application.

[0052] Figure 2 yes Figure 1 Section view of the AA plane.

[0053] Figure 3 yes Figure 1 Sectional view of the BB plane.

[0054] Description of reference numerals:

[0055] 1. Main module; 11. Gravity sedimentation chamber; 12. Filter chamber; 13. Clean air chamber; 2. Air intake module; 21. Air intake duct; 211. Air inlet; 212. Air outlet; 3. Filter module; 31. Partition; 32. Filter body; 33. Filter chamber; 4. Air outlet module; 41. Fan; 42. Exhaust duct; 5. Pulse spray module; 6. Collection module; 61. Intermediate transmission structure; 62. Collection bag. DETAILED DESCRIPTION

[0056] The present application discloses a waste gas treatment system for a waste aluminum smelting and casting system, referring to Figure 1-2 , including a main body module 1, an air intake module 2, a filtering module 3, an air outlet module 4, a pulse spray module 5 and a collecting module 6.

[0057] Reference Figure 2 The main module 1 includes a gravity settling chamber 11, a filter chamber 12 and a clean air chamber 13 which are arranged in sequence from bottom to top. The gravity settling chamber 11, the filter chamber 12 and the clean air chamber 13 are all cast by concrete.

[0058] Reference Figure 2-3 The air intake module 2 includes an air intake pipe 21, and the air intake pipe 21 is provided with an air intake port 211 and an air outlet port 212, wherein the air intake port 211 of the air intake pipe 21 is connected to the exhaust module of the waste aluminum smelting and casting system, and the air outlet port 212 of the air intake pipe 21 is located at the side where the air intake pipe 21 is connected to the gravity settling chamber 11, and the air intake pipe 21 is connected to the gravity settling chamber 11 through the air outlet port 212, and is used to transport the waste gas generated by the waste aluminum smelting and casting system to the gravity settling chamber 11. Specifically, in this embodiment, the area of ​​the longitudinal section of the air intake pipe 21 gradually decreases in the direction away from the air intake port 211 of the air intake pipe 21, which can increase the friction of the waste gas entering the air intake pipe 21, reduce the flow rate of the waste gas, and facilitate the pre-sedimentation of large particles of aluminum slag in the waste gas in the gravity settling chamber 11.

[0059] Reference Figure 2-3 The filter module 3 includes a partition 31, a filter body 32 and a filter chamber 33. The partition 31 is arranged between the filter chamber 12 and the clean air chamber 13, and is used to separate the filter chamber 12 from the clean air chamber 13, and provides a mounting base for the filter body 32. Among them, the partition 31 is provided with an air vent, and the position of the air vent corresponds to the filter chamber 33, which is used to allow the purified gas to enter the clean air chamber 13. The filter body 32 includes a bag cage and a filter bag. The bag cage is located in the filter chamber 12 and is vertically installed on the partition 31 for positioning the filter bag. The filter bag is sleeved and fixed on the outer peripheral side of the bag cage to isolate the aluminum slag in the exhaust gas. The filter chamber 33 is a space surrounded by the filter bag. The filter chamber 33 is separated from the filter chamber 12 by the filter bag, and is separated from the clean room by the partition 31. In the purification and dust removal stage, the exhaust gas enters the filter chamber 12 after pre-sedimentation. Under the barrier effect of the filter bag, the purified gas enters the filter cavity 33 and finally enters the clean air chamber 13 through the air holes on the partition 31.

[0060] Reference Figure 1-2The air outlet module 4 includes a fan 41 and an exhaust duct 42. The air inlet of the fan 41 is connected to the clean air chamber 13, and the air outlet of the fan 41 is connected to the exhaust duct 42. When the fan 41 is started, the fan 41 discharges the purified gas in the clean air chamber 13 into the atmosphere.

[0061] Reference Figure 1-2 The pulse spray module 5 includes an air compressor and a pulse spray structure. The air compressor provides compressed air for the pulse spray structure. The pulse spray structure sprays the compressed air into the filter cavity 33 and blows the aluminum slag attached to the outer peripheral side of the filter bag to the gravity settling chamber 11. After long-term use, a layer of aluminum slag will be attached to the outer peripheral side of the filter bag. If it is not treated, it will affect the purification efficiency of the filter bag. The pulse spray module 5 is used to spray the filter bag regularly, which is conducive to ensuring the ventilation effect of the filter bag.

[0062] Reference Figure 2 The collecting module 6 includes an intermediate transmission structure 61 and a collecting bag 62 . The intermediate transmission structure 61 is located below the gravity settling chamber 11 and is used to transfer the aluminum slag in the gravity settling chamber 11 to the collecting bag 62 .

[0063] Among them, the exhaust gas treatment system in this application is placed in an open-air environment all year round, so the concrete used in the main module 1 has high corrosion resistance requirements. In addition, the amount of aluminum slag generated during the smelting process is also very large, and direct disposal will generate a large amount of solid waste and seriously waste resources.

[0064] To this end, we have also been committed to the research on the reuse of aluminum slag in concrete. However, during the research process, it was found that adding aluminum slag directly to concrete is likely to aggravate the corrosion of concrete. In this regard, the inventors first used a bonding material composed of cement and water to pre-modify the aluminum slag, and then used silicone-modified acrylic emulsion to modify the aluminum slag. After preparing the modified aluminum slag, the modified aluminum slag was used together with coarse aggregate, fine aggregate, etc. to prepare concrete, which effectively realized the reuse of aluminum slag and obtained concrete with excellent corrosion resistance.

[0065] The corrosion-resistant concrete doped with aluminum slag is further explained below in combination with specific experiments.

[0066] Experiment 1:

[0067] A concrete, the raw materials of which include 300kg of cement, 150kg of fly ash, 755kg of crushed stone with continuous grading of 5-12mm, 245kg of aluminum slag, 400kg of fine sand with fineness modulus of 2.4-2.8, 4kg of water reducer, 45kg of organosilicon modified acrylic emulsion and 165kg of water, wherein the water reducer includes polycarboxylate water reducer and sodium lignin sulfonate, and the weight ratio of the polycarboxylate water reducer to the sodium lignin sulfonate is 3:1; the organosilicon modified acrylic emulsion adopts organosilicon modified acrylic emulsion with model HBC-3000 produced by Beijing Huyi.

[0068] Specifically, the preparation method of concrete in this experiment includes the following steps:

[0069] Aluminum slag modification process:

[0070] 60 kg of cement and 33 kg of water were uniformly mixed to obtain a bonding slurry;

[0071] Aluminum slag is added to the bonding slurry, stirred evenly, poured into a mold for drying, forming, and then crushed to prepare pre-treated aluminum slag with a particle size range of 5-12 mm;

[0072] The pretreated aluminum slag is put into the organosilicon modified acrylic emulsion, stirred evenly, and allowed to stand for 30 minutes. The pretreated aluminum slag is then separated from the organosilicon modified acrylic emulsion and dried to obtain modified aluminum slag with a moisture content of less than 0.1%.

[0073] Concrete preparation process:

[0074] The water reducing agent was uniformly mixed with 132 kg of water to obtain an admixture solution;

[0075] Add 240 kg of cement and fly ash into the admixture solution and mix evenly to obtain cement slurry;

[0076] Add crushed stone, fine sand and modified aluminum slag into cement slurry, mix well, and obtain concrete.

[0077] Experiment 2

[0078] A concrete, the raw materials of which include 450kg of cement, 100kg of fly ash, 785kg of crushed stone with continuous grading of 5-12mm, 175kg of aluminum slag, 450kg of fine sand with a fineness modulus of 2.4-2.8, 8kg of water reducer, 35kg of organosilicon modified acrylic emulsion and 175kg of water, wherein the water reducer includes polycarboxylate water reducer and sodium lignin sulfonate, the weight ratio of the polycarboxylate water reducer to the sodium lignin sulfonate is 4:1, and the organosilicon modified acrylic emulsion adopts Jilong Chemical's JE-6748 organosilicon modified acrylic emulsion.

[0079] Specifically, the preparation method of concrete in this experiment includes the following steps:

[0080] Aluminum slag modification process:

[0081] 45 kg of cement and 17.5 kg of water were uniformly mixed to obtain a bonding slurry;

[0082] Aluminum slag is added to the bonding slurry, stirred evenly, poured into a mold for drying, forming, and then crushed to prepare pre-treated aluminum slag with a particle size range of 5-12 mm;

[0083] The pretreated aluminum slag is put into the organosilicon modified acrylic emulsion, stirred evenly, and allowed to stand for 30 minutes. The pretreated aluminum slag is then separated from the organosilicon modified acrylic emulsion and dried to obtain modified aluminum slag with a moisture content of less than 0.1%.

[0084] Concrete preparation process:

[0085] The water reducing agent was uniformly mixed with 147.5 kg of water to obtain an admixture solution;

[0086] Add 405 kg of cement and fly ash into the admixture solution and mix evenly to obtain cement slurry;

[0087] Add crushed stone, fine sand and modified aluminum slag into cement slurry, mix well, and obtain concrete.

[0088] Experiment 3

[0089] A concrete, the raw materials of which include 300kg of cement, 150kg of fly ash, 755kg of crushed stone with continuous grading of 5-12mm, 245kg of aluminum slag, 400kg of fine sand with a fineness modulus of 2.4-2.8, 4kg of water reducer and 165kg of water, wherein the water reducer includes polycarboxylate water reducer and sodium lignin sulfonate, and the weight ratio of the polycarboxylate water reducer to the sodium lignin sulfonate is 3:1.

[0090] Specifically, the preparation method of concrete in this experiment includes the following steps:

[0091] uniformly mixing the water reducing agent with water to obtain an admixture solution;

[0092] Adding cement and fly ash into the admixture solution and mixing them evenly to obtain cement slurry;

[0093] Add crushed stone, fine sand and aluminum slag into cement slurry, mix well, and obtain concrete.

[0094] Experiment 4

[0095] A concrete, the raw materials of which include 300kg of cement, 150kg of fly ash, 755kg of crushed stone with continuous grading of 5-12mm, 245kg of aluminum slag, 400kg of fine sand with a fineness modulus of 2.4-2.8, 4kg of water reducer and 165kg of water, wherein the water reducer includes polycarboxylate water reducer and sodium lignin sulfonate, and the weight ratio of the polycarboxylate water reducer to the sodium lignin sulfonate is 3:1.

[0096] Specifically, the preparation method of concrete in this experiment includes the following steps:

[0097] Aluminum slag modification process:

[0098] 60 kg of cement and 33 kg of water were uniformly mixed to obtain a bonding slurry;

[0099] Aluminum slag is added to the bonding slurry, stirred evenly, poured into a mold, dried, formed, and then crushed to prepare modified aluminum slag with a particle size range of 5-12 mm and a moisture content of less than 0.1%.

[0100] Concrete preparation process:

[0101] The water reducing agent was uniformly mixed with 132 kg of water to obtain an admixture solution;

[0102] Add 240 kg of cement and fly ash into the admixture solution and mix evenly to obtain cement slurry;

[0103] Add crushed stone, fine sand and modified aluminum slag into cement slurry, mix well, and obtain concrete.

[0104] Experiment 5

[0105] A concrete, the raw materials of which include 300kg of cement, 150kg of fly ash, 755kg of crushed stone with continuous grading of 5-12mm, 245kg of aluminum slag, 400kg of fine sand with fineness modulus of 2.4-2.8, 4kg of water reducer, 5kg of organosilicon modified acrylic emulsion and 165kg of water, wherein the water reducer includes polycarboxylate water reducer and sodium lignin sulfonate, and the weight ratio of the polycarboxylate water reducer to the sodium lignin sulfonate is 3:1; the organosilicon modified acrylic emulsion adopts organosilicon modified acrylic emulsion with model HBC-3000 produced by Beijing Huyi.

[0106] Specifically, the preparation method of concrete in this experiment includes the following steps:

[0107] Aluminum slag modification process:

[0108] The aluminum slag is put into the silicone modified acrylic emulsion, stirred evenly, dried and crushed to obtain the modified aluminum slag with a particle size range of 5-12 mm and a moisture content of less than 0.1%.

[0109] Concrete preparation process:

[0110] uniformly mixing the water reducing agent with water to obtain an admixture solution;

[0111] Adding cement and fly ash into the admixture solution and mixing them evenly to obtain cement slurry;

[0112] Add crushed stone, fine sand and modified aluminum slag into cement slurry, mix well, and obtain concrete.

[0113] Experiment 6

[0114] A concrete comprises 300kg of cement, 150kg of fly ash, 1000kg of crushed stone with a continuous gradation of 5-12mm, 400kg of fine sand with a fineness modulus of 2.4-2.8, 4kg of water reducer and 165kg of water, wherein the water reducer comprises a polycarboxylate water reducer and sodium lignin sulfonate, and the weight ratio of the polycarboxylate water reducer to the sodium lignin sulfonate is 3:1.

[0115] Specifically, the preparation method of concrete in this experiment includes the following steps:

[0116] uniformly mixing the water reducing agent with water to obtain an admixture solution;

[0117] Adding cement and fly ash into the admixture solution and mixing them evenly to obtain cement slurry;

[0118] Add crushed stone and fine sand into cement slurry and mix well to obtain concrete.

[0119] The corrosion resistance of the concrete obtained in Experiment 1 and Experiment 6 was tested:

[0120] (1) Chloride ion migration coefficient: The chloride ion diffusion coefficient was determined by referring to the rapid chloride ion migration coefficient method (RCM method) in GBT50082-2009 "Standard for test methods of long-term performance and durability of ordinary concrete".

[0121] (2) Steel bar corrosion weight loss rate: The test is carried out according to the steel bar corrosion test in concrete in GBT50082-2009 "Standard for Test Methods for Long-term Performance and Durability of Ordinary Concrete".

[0122] (3) Sulfate resistance level: Test with reference to the sulfate resistance test in GBT50082-2009 "Standard for Test Methods for Long-term Performance and Durability of Ordinary Concrete" and record the sulfate resistance level of the concrete.

[0123] Table 1

[0124]

[0125] Combined with the results in Table 1 above, it can be seen that: firstly pre-modifying the aluminum slag with a bonding slurry made of cement and water, and then modifying the aluminum slag with a silicone-modified acrylic emulsion, and controlling the water content of the modified aluminum slag to be lower than 0.1%, is conducive to obtaining corrosion-resistant concrete with a low chloride ion migration coefficient, a low steel bar corrosion weight loss rate and good sulfate corrosion resistance.

[0126] In Experiment 4, the aluminum slag was modified by a bonding slurry made of cement and water alone, and in Experiment 5, the aluminum slag was modified by a silicone-modified acrylic emulsion alone. When the aluminum slag was modified by a bonding slurry made of cement and water alone, the corrosion resistance of the concrete was equivalent to that of the concrete directly mixed with aluminum slag. When the aluminum slag was modified by a silicone-modified acrylic emulsion alone, the corrosion resistance of the concrete was equivalent to that of the concrete directly mixed with aluminum slag, which was improved to a certain extent, but still far behind the concrete without aluminum slag.

[0127] The difference between Experiment 1 and Experiment 6 is that the aluminum slag in Experiment 6 is replaced by an equal amount of crushed stone, and no organosilicon-modified acrylic emulsion is added in Experiment 6, and the modification process of the aluminum slag is omitted. Combined with the data in Table 1, it can be seen that the aluminum slag is first pre-modified with a bonding slurry made of cement and water, and then the aluminum slag is modified with an organosilicon-modified acrylic emulsion, and the water content of the modified aluminum slag is controlled to be less than 0.1%. The corrosion resistance of the concrete is equivalent to that of the concrete without the addition of aluminum slag, which not only effectively utilizes the aluminum slag, but also obtains a concrete with good corrosion resistance and can be used for a long time in an open air environment.

[0128] This specific implementation manner is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the specific implementation manner as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A waste gas treatment system for a waste aluminum smelting system, characterized in that: include: A main body module (1), the main body module (1) being cast from concrete, comprising a gravity settling chamber (11), a filter chamber (12) and a clean air chamber (13) arranged in sequence from bottom to top, the clean air chamber (13) being separated from the gravity settling chamber (11) and the filter chamber (12); An air intake module (2), wherein the air intake module (2) transports waste gas generated during the aluminum slag smelting process to the gravity settling chamber (11) for pre-sedimentation; A filter module (3), the filter module (3) comprising a filter body (32) and a filter cavity (33), the filter body (32) being installed in the filter chamber (12), the filter cavity (33) being used to accommodate the purified gas after filtering; wherein the filter chamber (12) and the filter cavity (33) are separated by the filter body (32), and the filter cavity (33) is in communication with the clean gas chamber (13); An air outlet module (4), the air outlet module (4) transporting the purified gas in the clean air chamber (13) into the atmosphere; The concrete used in the main module (1) comprises the following components in parts by weight: Cement: 300-450 parts; Fly ash: 100-150 parts; Coarse aggregate: 755-785 parts; Aluminum slag: 175-245 parts; Fine aggregate: 400-450 parts; Water reducing agent: 4-8 parts; Silicone modified acrylic emulsion: 35-45 parts; Water: 165-175 parts; The preparation of the concrete includes an aluminum slag modification process and a concrete preparation process, wherein the aluminum slag modification process includes the following steps: Evenly mix 10-20wt% of cement and 10-20wt% of water to obtain a bonding slurry; Aluminum slag is added to the bonding slurry, stirred evenly, poured into a mold, dried, formed, and then crushed to prepare pretreated aluminum slag with a particle size range of 5-12 mm; The pretreated aluminum slag is put into the organosilicon-modified acrylic emulsion and stirred. Then, the pretreated aluminum slag is separated from the organosilicon-modified acrylic emulsion and dried to obtain modified aluminum slag with a moisture content of less than 0.1%.

2. The waste gas treatment system for a waste aluminum smelting and casting system according to claim 1, characterized in that: The air intake module (2) comprises an air intake pipe (21), the air intake pipe (21) being provided with an air intake port (211) and an air outlet port (212), the air intake port (211) of the air intake pipe (21) being connected to an exhaust module of a waste aluminum smelting and casting system, and the air outlet port (212) of the air intake pipe (21) being located on a side where the air intake pipe (21) is connected to a gravity settling chamber (11); wherein the area of ​​a longitudinal section of the air intake pipe (21) gradually decreases in a direction away from the air intake port (211) of the air intake pipe (21).

3. The waste gas treatment system for a waste aluminum smelting and casting system according to claim 1, characterized in that: Also includes: A pulse spray module (5), the pulse spray module (5) being used to periodically perform pulse spraying on the filter body (32) to remove aluminum slag accumulated on the outer peripheral side of the filter body (32); A collecting module (6), the collecting module (6) being located below the gravity settling chamber (11) and being used for collecting the aluminum slag sprayed down from the filtering body (32).

4. The waste gas treatment system for a waste aluminum smelting and casting system according to claim 3, characterized in that: The pulse jet module (5) comprises an air compression device and a pulse jet structure, wherein the air compression device provides compressed air to the pulse jet structure, and the pulse jet structure sprays the compressed air into the filter cavity (33), and the compressed air blows the aluminum slag attached to the outer wall of the filter body (32) into the gravity settling chamber (11).

5. The waste gas treatment system for a waste aluminum smelting and casting system according to claim 1, characterized in that: The water reducer comprises a polycarboxylate water reducer and sodium lignin sulfonate, and the weight ratio of the polycarboxylate water reducer to the sodium lignin sulfonate is (3-4):

1.

6. The waste gas treatment system for a waste aluminum smelting and casting system according to claim 1, characterized in that: The coarse aggregate is crushed stone with a continuous grading of 5-12 mm.

7. The waste gas treatment system for a waste aluminum smelting and casting system according to claim 1, characterized in that: The fine aggregate is fine sand with a fineness modulus of 2.4-2.

8.

8. The waste gas treatment system for a waste aluminum smelting and casting system according to claim 1, characterized in that: The concrete preparation process comprises the following steps: uniformly mixing the water reducing agent with the remaining water to obtain an admixture solution; uniformly mixing the remaining cement, fly ash and admixture solution to obtain cement slurry; The coarse aggregate, fine aggregate and modified aluminum slag are added into cement slurry and mixed evenly to obtain concrete.

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