A treatment method for sewage in an aluminum profile production line

Abstract

The present invention discloses a method for treating sewage in aluminum profile production, which includes discharging alkaline sewage and acidic sewage into a collection tank. After standing and sedimentation, a treatment agent is added. After standing treatment, filtration is carried out, and then after adding a sand-carbon mixture for filtration, it flows into a recycled water collection tank. According to the water usage requirements of the aluminum profile production line, it then flows into an oil removal and water washing tank, an alkali etching and water washing tank, and a neutralization and water washing tank respectively; Component A of the treatment agent is a composite material in which Mg(OH)2 nanosheets are wrapped on the surface of spherical Fe3O4; Component B is a tantalum pentachloride ion hybrid ultra-microporous material. This application can effectively recover the sewage from the production line through optimized treatment processes and can be reused in the aluminum profile production line after treatment. It can not only make greater use of resources, but also reduce the production pressure of aluminum profile factories. The overall production cost is relatively low, which helps to improve the treatment effect and treatment efficiency of aluminum profile sewage.

Description

Technical Field

[0001] The present invention relates to the field of sewage treatment, and more particularly to a method for treating sewage from an aluminum profile production line. Background Art

[0002] Aluminum is a good energy-saving and environmental protection material and has been widely used in industries such as construction, packaging, and transportation. During the processing of aluminum profiles, in the anodic oxidation production line of aluminum profiles, a large amount of water is required for water washing after alkaline etching and water washing after oxidation. If it is directly discharged without treatment, it will pollute the environment. Therefore, sewage treatment is also necessary. In the current aluminum profile oxidation production line, the water after water washing after alkaline etching and water washing after anodic oxidation is directly discharged to the wastewater workshop for treatment, which will also increase the burden on the enterprise, and the resources cannot be utilized to the maximum extent. When the water consumption in the aluminum profile oxidation production line is large, the waste residue containing a large amount of sodium sulfate in the flocculant precipitate used in the wastewater workshop is a strong acid and strong base salt, which will not hydrolyze in water to form a colloid, and therefore cannot be reused as a water purification agent. In summary, the prior art has problems such as high sewage treatment cost, cumbersome operation, easy secondary pollution, and the components after treatment cannot be reused. Summary of the Invention

[0003] Based on this, in order to solve the problems in the prior art such as high sewage treatment cost, cumbersome operation, easy secondary pollution, and the components after treatment cannot be reused, the present invention provides a method for treating sewage from an aluminum profile production line, and the specific technical solutions are as follows:

[0004] A method for treating sewage from an aluminum profile production line, the treatment method comprising the following steps:

[0005] Drain the alkaline sewage after water washing after alkaline etching into a collection tank and automatically control the liquid level height of the alkaline sewage according to the pH of the alkaline sewage;

[0006] Continue to drain the acidic sewage after water washing after anodic oxidation into the collection tank, then stir and adjust the pH to neutral, let it stand for precipitation and then stratify, and extract the upper liquid to obtain a primary filtrate;

[0007] Add a treatment agent to the primary filtrate, let it stand for treatment, then filter to obtain a filtrate to obtain a secondary filtrate;

[0008] After subjecting the secondary filtrate to sand-carbon mixed filtration treatment, it then flows into a recycled water collection tank, and according to the water use requirements of the aluminum profile production line, it flows into an oil removal water washing tank, an alkaline etching water washing tank, and a neutralization water washing tank respectively;

[0009] Wherein, the treatment agent includes component A and component B, the component A is a composite material with Mg(OH)2 nanosheets wrapped on the surface of spherical Fe3O4; the component B is a tantalum pentachloride ion hybrid ultra-microporous material.

[0010] Further, the pH of the acidic sewage is 1.2 to 1.3.

[0011] Further, adjusting the pH to neutral is 6.0 to 8.0.

[0012] Further, after adding the treatment agent, the standing treatment time is 20 min to 50 min.

[0013] Further, the mass ratio of the component A to the component B is 1 to 5:3 to 7.

[0014] Further, the preparation method of the component A is as follows: Disperse Fe3O4 in water, then add MgCl2, adjust the pH to alkaline under stirring conditions, after hydrothermal reaction, filter, wash, and dry to obtain the component A.

[0015] Further, NaOH is used to adjust the pH.

[0016] Further, the mass ratio of the MgCl2 to the Fe3O4 is 1 to 5:1 to 9.

[0017] Further, the preparation method of the component B is as follows: Add hydrofluoric acid, nickel nitrate hexahydrate, and pyrazine to tantalum pentachloride, heat and react under stirring conditions of 500 r / min to 1000 r / min, after the reaction ends, cool to room temperature, filter and wash to obtain the component B.

[0018] Further, the temperature of the heating reaction is 75°C to 90°C, and the time is 10 h to 12 h.

[0019] In the above solution, by optimizing the treatment process, the sewage of the production line can be effectively recovered and reused in the aluminum profile production line after treatment. This can not only make greater use of resources, but also reduce the production pressure of the aluminum profile factory, and the overall production cost is relatively low; aluminum hydroxide materials can be obtained from the lower layer of the water body and used to make water purification agents; by automatically adjusting the pH online, it has the advantages of higher precision and automation; in addition, a treatment agent is added in this application. This treatment agent not only has good thermal, water, and air stability, the component A has a layered structure, has excellent precipitation effect and the magnetic material can quickly recover metals, avoiding secondary pollution, the component B has a microporous structure and adsorption stability, and its synergistic effect with the component A helps to improve the treatment effect and treatment efficiency of the aluminum profile sewage. Specific Embodiments

[0020] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with its embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the protection scope of the present invention.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0022] A method for treating sewage in an aluminum profile production line according to an embodiment of the present invention, the treatment method comprising the following steps:

[0023] Drain the alkaline sewage after alkaline etching and water washing into the collection pool and automatically control the liquid level height of the alkaline sewage according to the pH of the alkaline sewage;

[0024] Continue to drain the acidic sewage after anodic oxidation and water washing into the collection pool, then stir and adjust the pH to neutral, let it stand for precipitation and then stratify, and extract the upper liquid to obtain a primary filtrate;

[0025] Add a treatment agent to the primary filtrate, after standing treatment, filter to obtain a filtrate to obtain a secondary filtrate;

[0026] After subjecting the secondary filtrate to sand-carbon mixed filtration treatment, it then flows into the recycled water collection pool, and according to the water use requirements of the aluminum profile production line, it flows into the degreasing water washing tank, alkaline etching water washing tank and neutralization water washing tank respectively;

[0027] Wherein, the treatment agent includes component A and component B, the component A is a composite material with Mg(OH)2 nanosheets wrapped on the surface of spherical Fe3O4; the component B is a tantalum pentachloride ion hybrid ultra-microporous material.

[0028] In one embodiment, the pH automatic control system can automatically adjust the pH of the water in the collection pool according to the set pH value.

[0029] In one embodiment, the pH of the acidic sewage is 1.2 to 1.3.

[0030] In one embodiment, the adjustment of the pH to neutral is 6.0 to 8.0.

[0031] In one embodiment, after adding the treatment agent, the standing treatment time is 20 min to 50 min.

[0032] In one embodiment, the mass ratio of component A to component B is 1-5:3-7.

[0033] In one embodiment, the preparation method of component A is as follows: Disperse Fe3O4 in water, then add MgCl2, adjust the pH to alkaline under stirring conditions, after hydrothermal reaction, filter, wash, and dry to obtain component A.

[0034] In one embodiment, NaOH is used to adjust the pH.

[0035] In one embodiment, the mass ratio of MgCl2 to Fe3O4 is 1-5:1-9.

[0036] In one embodiment, the temperature of the hydrothermal reaction is 65°C - 85°C, and the time is 1h - 3h.

[0037] In one embodiment, the preparation method of component B is as follows: Add hydrofluoric acid, nickel nitrate hexahydrate, and pyrazine to tantalum pentachloride, heat and react under stirring conditions of 500r / min - 1000r / min, after the reaction ends, cool to room temperature, filter and wash to obtain component B.

[0038] In one embodiment, the temperature of the heating reaction is 75°C - 90°C, and the time is 10h - 12h.

[0039] In one embodiment, the addition amount of the treatment agent accounts for 1% - 3% of the total volume of the alkaline sewage and the acidic sewage.

[0040] In one embodiment, the mass ratio of hydrofluoric acid, nickel nitrate hexahydrate, and pyrazine added to tantalum pentachloride is 1-5:2-7:1-3.

[0041] In the above solution, by optimizing the treatment process, the sewage of the production line can be effectively recovered and reused in the aluminum profile production line after treatment. This not only enables greater utilization of resources but also reduces the production pressure of the aluminum profile factory, with relatively low overall production costs. Aluminum hydroxide materials can be obtained from the lower layer of the water body and used to make water purifying agents. By automatically adjusting the pH online, it has the advantages of higher precision and automation. In addition, a treatment agent is added in this application. This treatment agent not only has good thermal, water, and air stability. Component A has a layered structure, has excellent precipitation effects, and the magnetic material can quickly recover metals, avoiding secondary pollution. Component B has a microporous structure and adsorption stability, and its synergistic effect with component A helps to improve the treatment effect and efficiency of aluminum profile sewage.

[0042] The following will describe the implementation plan of the present invention in detail with specific embodiments.

[0043] Example 1:

[0044] A method for treating sewage in an aluminum profile production line, comprising the following steps:

[0045] Disperse Fe3O4 in water, then add MgCl2 according to the mass ratio of MgCl2 to the Fe3O4 being 5:9. Under stirring conditions, adjust the pH to 8 using NaOH, carry out a hydrothermal reaction at 85 °C for 2 h, then filter, wash, and dry to obtain Component A;

[0046] Add hydrofluoric acid, nickel nitrate hexahydrate, and pyrazine to tantalum pentachloride with a mass ratio of 3:2:1, mix them under stirring conditions at 1000 r / min, heat and react at 90 °C for 10 h. After the reaction ends, cool to room temperature, filter and wash to obtain Component B;

[0047] Mix Component A and Component B with a mass ratio of 5:7 to obtain a treatment agent;

[0048] Drain the alkaline sewage after alkaline etching and water washing into the collection tank, automatically control the liquid level height of the alkaline sewage according to the pH of the alkaline sewage, continue to drain the acidic sewage after anodic oxidation and water washing into the collection tank, then stir and adjust the pH to 8, let it stand and precipitate and then layer, extract the upper liquid to obtain a first-stage filtrate;

[0049] Add a treatment agent to the first-stage filtrate, and the addition amount accounts for 3% of the total volume of the alkaline sewage and the acidic sewage. After standing and treating for 50 min, filter to obtain a filtrate to obtain a second-stage filtrate;

[0050] Carry out sand-carbon mixed filtration treatment on the second-stage filtrate, then flow it into the recycled water collection tank, and then flow it into the degreasing water washing tank, alkaline etching water washing tank, and neutralization water washing tank respectively according to the water use requirements of the aluminum profile production line.

[0051] Example 2:

[0052] A method for treating sewage in an aluminum profile production line, comprising the following steps:

[0053] Disperse Fe3O4 in water, then add MgCl2 according to the mass ratio of MgCl2 to the Fe3O4 being 3:5. Under stirring conditions, adjust the pH to 8 using NaOH, carry out a hydrothermal reaction at 75 °C for 2 h, then filter, wash, and dry to obtain Component A;

[0054] Add hydrofluoric acid, nickel nitrate hexahydrate, and pyrazine to tantalum pentachloride with a mass ratio of 4:3:2, mix them under stirring conditions at 800 r / min, heat and react at 85 °C for 12 h. After the reaction ends, cool to room temperature, filter and wash to obtain Component B;

[0055] Mix component A and component B with a mass ratio of 4:7 to obtain a treating agent.

[0056] Drain the alkaline sewage after alkaline etching and water washing into the collection pool, automatically control the liquid level height of the alkaline sewage according to the pH of the alkaline sewage, continue to drain the acidic sewage after anodic oxidation and water washing into the collection pool, then stir and adjust the pH to 8, let it stand for precipitation and then stratify, extract the upper liquid to obtain a primary filtrate.

[0057] Add the treating agent to the primary filtrate in an amount accounting for 2% of the total volume of the alkaline sewage and the acidic sewage, let it stand for treatment for 30 min, then filter to obtain a filtrate, which is the secondary filtrate.

[0058] Perform sand-carbon mixed filtration on the secondary filtrate, then flow it into the recycled water collection pool, and then flow it into the degreasing water washing tank, alkaline etching water washing tank and neutralization water washing tank respectively according to the water use requirements of the aluminum profile production line.

[0059] Example 3:

[0060] A method for treating sewage in an aluminum profile production line, comprising the following steps:

[0061] Disperse Fe3O4 in water, then add MgCl2 according to the mass ratio of MgCl2 to the Fe3O4 of 3:5, under stirring conditions, adjust the pH to 8 with NaOH, carry out hydrothermal reaction at 75 °C for 2 h, then filter, wash and dry to obtain component A.

[0062] Add hydrofluoric acid, nickel nitrate hexahydrate and pyrazine to tantalum pentachloride with a mass ratio of 3:5:3, under stirring conditions at 500 r / min, heat and react at 85 °C for 10 h, after the reaction is completed, cool to room temperature, filter and wash to obtain component B.

[0063] Mix component A and component B with a mass ratio of 3:4 to obtain a treating agent.

[0064] Drain the alkaline sewage after alkaline etching and water washing into the collection pool, automatically control the liquid level height of the alkaline sewage according to the pH of the alkaline sewage, continue to drain the acidic sewage after anodic oxidation and water washing into the collection pool, then stir and adjust the pH to 8, let it stand for precipitation and then stratify, extract the upper liquid to obtain a primary filtrate.

[0065] Add the treating agent to the primary filtrate in an amount accounting for 1% of the total volume of the alkaline sewage and the acidic sewage, let it stand for treatment for 50 min, then filter to obtain a filtrate, which is the secondary filtrate.

[0066] After subjecting the secondary filtrate to sand-carbon mixed filtration treatment, it then flows into the recycled water collection tank. According to the water usage requirements of the aluminum profile production line, it then flows into the degreasing and water washing tank, the alkali etching and water washing tank, and the neutralization and water washing tank respectively.

[0067] Comparative Example 1:

[0068] The difference between Comparative Example 1 and Example 3 is that no treatment agent was added in Comparative Example 1. The specific treatment method is as follows:

[0069] Drain the alkaline sewage from the post-alkali etching water wash into the collection tank and automatically control the liquid level height of the alkaline sewage according to the pH of the alkaline sewage. Continue to drain the acidic sewage from the post-anodic oxidation water wash into the collection tank, then stir and adjust the pH to 8. After standing and sedimenting, it is stratified, and the upper layer liquid is extracted to obtain the primary filtrate;

[0070] After subjecting the primary filtrate to sand-carbon mixed filtration treatment, it then flows into the recycled water collection tank. According to the water usage requirements of the aluminum profile production line, it then flows into the degreasing and water washing tank, the alkali etching and water washing tank, and the neutralization and water washing tank respectively.

[0071] Comparative Example 2:

[0072] The difference from Example 3 is that component A was not added in Comparative Example 2, that is, the treatment agent does not include the composite material of Mg(OH)2 nanosheets coated on the surface of spherical Fe3O4, and the others are the same as Example 3.

[0073] Comparative Example 3:

[0074] The difference from Example 3 is that component B was not added in Comparative Example 3, that is, the treatment agent does not include the tantalum pentachloride ion hybrid ultra-microporous material, and the others are the same as Example 3.

[0075] Comparative Example 4:

[0076] The difference between Comparative Example 4 and Example 3 is that component A in Comparative Example 4 is Mg(OH)2, and the others are the same as Example 3.

[0077] Comparative Example 5:

[0078] The difference between Comparative Example 5 and Example 3 is that component A in Comparative Example 5 is Fe3O4, and the others are the same as Example 3.

[0079] Comparative Example 6:

[0080] The difference between Comparative Example 6 and Example 3 is that component B in Comparative Example 6 is activated carbon, and the others are the same as Example 3.

[0081] The performance of the water treated by the methods of Examples 1 to 3 and the water treated by the methods of Comparative Examples 1 to 6 was tested, and the results are shown in Table 1 below. Untreated sewage was used as a blank control.

[0082] Table 1:

[0083]

[0084] It should be noted that the content of fluorine detected in the blank control was 35 mg / L, the content of copper was 30 mg / L, and the content of nickel was 25 mg / L. From the data analysis in Table 1, it can be seen that by optimizing the composition of the treatment agent in this application, excellent treatment effects can be achieved. In Comparative Example 1, no treatment agent was added, and the treatment effect obtained was significantly worse than that of Example 3. In Comparative Example 2, component A was not added, but the treatment effect was also worse than that of Example 3. In Comparative Example 3, component B was not added, but the treatment effect was still worse than that of Example 3, indicating that the combined use of component A and component B in this application achieved a synergistic effect where one plus one is greater than two. In Comparative Examples 4 and 5, different components of component A were used, which also affected the final treatment effect. In Comparative Example 6, component B was replaced with activated carbon, and the final treatment effect was also worse than that of Example 3, further demonstrating that the synergistic effect of component A and component B in this application has a significant treatment effect, and the treated sewage can be recycled and used in the production line, which is beneficial to resource utilization.

[0085] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0086] The above-described embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent should be subject to the appended claims.

Claims

1. A method for treating sewage in an aluminum profile production line, characterized in that, The treatment method includes the following steps: Drain the alkaline sewage after alkaline etching and water washing into the collection pool, and automatically control the liquid level height of the alkaline sewage according to the pH of the alkaline sewage; Continue to drain the acidic sewage after anodic oxidation and water washing into the collection pool, then stir to adjust the pH to neutral, let it stand for precipitation and then stratify, and extract the upper liquid to obtain the first-stage filtrate; Add a treatment agent to the first-stage filtrate, after standing treatment, filter to obtain the filtrate to obtain the second-stage filtrate; After subjecting the second-stage filtrate to sand-carbon mixed filtration treatment, it then flows into the recycled water collection pool, and according to the water use requirements of the aluminum profile production line, it flows into the degreasing water washing tank, alkaline etching water washing tank and neutralization water washing tank respectively; Among them, the treatment agent includes component A and component B, and the mass ratio of component A to component B is 1-5:3-7; component A is a composite material with Mg(OH)2 nanosheets wrapped on the surface of spherical Fe3O4; component B is a tantalum pentachloride ion hybrid ultra-microporous material; The preparation method of component B is: add hydrofluoric acid, nickel nitrate hexahydrate and pyrazine to tantalum pentachloride, under the stirring condition of 500 r / min - 1000 r / min, heat and react, and the temperature of the heating reaction is 75°C - 90°C, and the time is 10 h - 12 h. After the reaction is completed, cool to room temperature, filter and wash to obtain component B.

2. The processing method according to claim 1, characterized in that, The pH of the acidic sewage is 1.2 - 1.

3.

3. The processing method according to claim 1, characterized in that Adjusting the pH to neutral is 6.0 - 8.

0.

4. The processing method according to claim 1, wherein After adding the treatment agent, the standing treatment time is 20 min - 50 min.

5. The processing method according to claim 4, characterized in that, The preparation method of component A is: disperse Fe3O4 in water, then add MgCl2, under the stirring condition, adjust the pH to alkaline, after hydrothermal reaction, filter, wash and dry to obtain component A.

6. The processing method according to claim 5, wherein NaOH is used to adjust the pH.

7. The processing method according to claim 6, wherein The mass ratio of MgCl2 to Fe3O4 is 1 - 5:1 - 9.

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