Aluminum profile oxidation line waste acid and waste alkali recycling equipment

Abstract

The utility model discloses an aluminum profile oxidation line waste acid waste alkali recycling equipment, including alkali mist absorption tower (1) and with alkali mist absorption tower (1) link's caustic washing tank (2) to acid mist absorption tower (3) and with acid mist absorption tower (3) link's oxidation tank (4), the caustic washing tank (2) and oxidation tank (4) between through pipeline intercommunication, utilize the overflow wastewater of caustic washing tank (2) as acid mist absorption tower (3) absorption neutralization use, the overflow wastewater in oxidation tank (4) then as alkali mist absorption tower (1) in absorption neutralization use, like this, one can with the wastewater of spillover of having acid and alkali re -use waste, reduce the cost required for secondary processing, and can effectively neutralize the absorption liquid PH value from the discharge of absorption tower, namely spray tower, thereby reduce the environmental pollution problem, and the treatment cost of overflow wastewater is lower, can effectively reduce the cost of sewage treatment.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology. Specifically, this utility model relates to a waste acid and waste alkali recycling device for aluminum profile oxidation lines. Background Technology

[0002] The aluminum profile anodizing production line generates alkaline mist and acid mist in the alkaline washing tank and anodizing tank, respectively. Alkaline mist is treated using an acid spray absorption tower, typically neutralized and absorbed with a sulfuric acid solution at pH 4-5. Acid mist is treated using an alkaline spray absorption tower, typically neutralized and absorbed with a sodium hydroxide solution at pH 10-11. Each spray absorption tower has a neutralization solution absorption tank with a volume of approximately 1 m³, which is pumped to the spray layer. To ensure absorption and neutralization effectiveness, the pH of the neutralization tank solution needs to be regularly monitored and the absorption solution replenished.

[0003] Both the alkaline washing tank and the post-oxidation washing tank in the oxidation line adopt counter-current rinsing. Overflow holes are set on the side of the tank. During normal production, when the material enters the washing tank, water overflows from the overflow holes. According to the test, the pH value of the overflow water in the first washing tank after the alkaline washing tank is about 11, and the pH value of the overflow water in the first washing tank after the oxidation tank is about 3. Usually, the overflow water is directly discharged to the integrated sewage treatment plant for treatment.

[0004] A patent application with patent number 202220235729.7 and publication date of August 19, 2022, discloses an aluminum profile spraying exhaust gas purification system. The system includes a primary cyclone water spray tower for initial cyclone spray dust removal of the exhaust gas; a secondary cyclone water spray tower for further cyclone spray dust removal of the exhaust gas after primary cyclone spray treatment; a multi-barrel cyclone spray tower for cyclone spray water mist adsorption and dust removal of the exhaust gas after secondary cyclone spray treatment; a dry filtration device for dry filtration of the exhaust gas after multi-barrel cyclone spray treatment; a molecular sieve UV degradation device for molecular sieve UV degradation of the exhaust gas after dry filtration; and an exhaust system for discharging the clean gas purified by the molecular sieve UV degradation device into the air. This system produces highly purified gas, which, after meeting emission standards, is discharged into the air through the exhaust system.

[0005] In existing technologies, the pH value in the neutralization tank of a spray tower is generally detected manually or automatically. When the pH does not meet the process requirements, sulfuric acid and sodium hydroxide need to be added manually or automatically. The acid and alkali consumed in the neutralization and absorption process constitute the environmental protection agent cost of the oxidation line. The overflow wastewater from the alkaline washing and oxidation washing tank will enter the sewage treatment plant for treatment through pipelines. After treatment processes such as conditioning, pH adjustment, and flocculation sedimentation, it will meet the discharge standards. The electricity, agent, and labor costs involved constitute the sewage treatment cost. Under the current trend of energy conservation, emission reduction, and cost reduction, this waste is very serious. It also causes the pH of the absorption and neutralization liquid to not meet the standards, resulting in the environmental risk of non-compliance of exhaust gas emissions. Utility Model Content

[0006] The present invention aims to provide a waste acid and alkali recycling device for aluminum profile oxidation lines that can reduce sewage discharge costs.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a waste acid and alkali recycling device for aluminum profile oxidation lines, comprising an alkali mist absorption tower and an alkali washing tank connected to the alkali mist absorption tower, an acid mist absorption tower and an oxidation tank connected to the acid mist absorption tower, wherein the alkali washing tank and the oxidation tank are interconnected by pipes, the end of the alkali washing tank is provided with an alkali-sludge pipe and an alkali neutralization pipe leading to a sewage treatment station, the end of the oxidation tank is provided with an acid-sludge pipe and an acid neutralization pipe leading to a sewage treatment station, the alkali neutralization pipe and the oxidation tank are connected by pipes, the acid neutralization pipe is connected to the alkali washing tank, the alkali neutralization pipe is provided with a first absorption liquid tank connected to the acid mist absorption tower, the acid neutralization pipe is provided with a second absorption liquid tank connected to the alkali mist absorption tower, and both the first absorption liquid tank and the second absorption liquid tank are provided with overflow ports.

[0008] The alkaline mist absorption tower is equipped with a first pH detector, and both the acid sludge pipe and the acid neutralization pipe are equipped with solenoid valves that are connected to the signal of the first pH detector.

[0009] The acid mist absorption tower is equipped with a second pH detector, and both the alkali-sludge pipe and the alkali neutralization pipe are equipped with solenoid valves that are connected to the signal of the second pH detector.

[0010] The outlet of the first absorbent tank is connected to the alkaline contaminant pipe, and the outlet of the second absorbent tank is connected to the acidic contaminant pipe.

[0011] The technical advantages of this invention are as follows: by recycling the overflow wastewater from the first water washing tank after the oxidation tank as the absorption and neutralization liquid of the alkali mist absorption tower, and by recycling the overflow wastewater from the first water washing tank after the alkali washing tank as the neutralization liquid of the acid mist spray absorption tower, the cost of acid and alkali treatment can be effectively reduced, and pollution can be reduced. Attached Figure Description

[0012] This manual includes the following figures, which illustrate the following: Figure 1 This is a schematic diagram of the structure of a waste acid and alkali recycling equipment for an aluminum profile oxidation line according to this utility model.

[0013] The following are marked in the diagram: 1. Alkali mist absorption tower; 2. Alkali washing tank; 3. Acid mist absorption tower; 4. Oxidation tank; 5. Alkali sludge pipe; 6. Alkali neutralization pipe; 7. Acid sludge pipe; 8. Acid neutralization pipe; 9. First absorption liquid tank; 10. Second absorption liquid tank; 11. First pH meter; 12. Second pH meter. Detailed Implementation

[0014] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the utility model concept and technical solution, and to facilitate its implementation.

[0015] Please see Figure 1 A waste acid and alkali recycling device for an aluminum profile oxidation line includes an alkali mist absorption tower 1 and an alkali washing tank 2 connected to the alkali mist absorption tower 1, as well as an acid mist absorption tower 3 and an oxidation tank 4 connected to the acid mist absorption tower 3. The alkali washing tank 2 and the oxidation tank 4 are interconnected by pipes. The overflow wastewater from the alkali washing tank 2 is used for absorption and neutralization in the acid mist absorption tower 3, while the overflow wastewater in the oxidation tank 4 is used for absorption and neutralization in the alkali mist absorption tower 1. This allows for the reuse of overflowing acidic and alkaline wastewater, reducing the cost of secondary treatment. It also effectively neutralizes the pH value of the absorbent liquid discharged from the absorption tower (i.e., the spray tower), thereby reducing environmental pollution. Furthermore, the treatment cost of the overflow wastewater is lower, effectively reducing the cost of wastewater treatment.

[0016] The end of the alkaline washing tank 2 is equipped with an alkaline wastewater pipe 5 and an alkaline neutralization pipe 6 leading to the sewage treatment plant. The end of the oxidation tank 4 is equipped with an acid wastewater pipe 7 and an acid neutralization pipe 8 leading to the sewage treatment plant. The alkaline neutralization pipe 6 is connected to the oxidation tank 4 via a pipeline, and the acid neutralization pipe 8 is connected to the alkaline washing tank 2. The oxidation tank 4 and the alkaline washing tank 2 each have two outlets: one is a pipeline that normally flows to the sewage treatment plant, and the other is a pipeline that needs to neutralize the overflow wastewater. The overflow wastewater from the oxidation tank 4 flows through the pipeline to the alkaline neutralization pipe 6, which can neutralize the overflow wastewater from the alkaline washing tank 2 with a higher pH value. The overflow wastewater from the alkaline washing tank 2 flows through the pipeline to the acid neutralization pipe 8, which can neutralize the acid washing tank wastewater with a lower pH value, thereby reducing pollution and costs.

[0017] The alkali neutralization pipe 6 is equipped with a first absorption liquid tank 9 connected to the acid mist absorption tower 3, and the acid neutralization pipe 8 is equipped with a second absorption liquid tank 10 connected to the alkali mist absorption tower 1; the overflow wastewater is neutralized through the absorption liquid tanks.

[0018] Both the first absorption tank 9 and the second absorption tank 10 are equipped with overflow ports to prevent backflow and pollution caused by excessive accumulation of wastewater in the absorption tank.

[0019] The alkaline mist absorption tower 1 is equipped with a first pH detector 11, and the acid pollution pipe 7 and the acid neutralization pipe 8 are each equipped with a solenoid valve that is connected to the signal of the first pH detector 11.

[0020] The acid mist absorption tower 3 is equipped with a second pH detector 12, and the alkali-sludge pipe 5 and the alkali neutralization pipe 6 are each equipped with a solenoid valve that is connected to the signal of the second pH detector 12.

[0021] The outlet of the first absorption tank 9 is connected to the alkaline contaminant pipe 5, and the outlet of the second absorption tank 10 is connected to the acid contaminant pipe 7.

[0022] Working principle: A pH detection device is installed for the alkali mist absorption tower 1 to monitor the pH value in the alkali washing tank 2 in real time. According to experience, the pH value of the absorbent should be controlled between 4 and 5. After analysis, the pH value of the first alkali washing tank 2 after oxidation is about 2-4. During the operation of the oxidation line, water overflows from the alkali washing tank 2 every time material is added. Therefore, using the overflow water from the alkali washing tank 2 as the absorbent can meet the requirements. A control system is provided for the pH detection device. When the pH is higher than 5, the solenoid valve of the pipeline to the first absorbent tank 9 is opened and the solenoid valve of the pipeline to the sewage treatment station is closed to replenish the acidic absorbent. When the pH is lower than 4, the solenoid valve of the pipeline to the first absorbent tank 9 is closed and the solenoid valve of the pipeline to the sewage treatment station is opened. This allows for precise control of the pH value of the absorbent. The first absorbent tank 9 is equipped with an overflow port. A pH detection device is installed for acid mist absorption tower 3 to monitor the pH value in oxidation tank 4 in real time. Based on experience, the pH value of the absorbent should be controlled between 10 and 11. After analysis, the pH value of the first oxidation tank 4 after alkaline washing of the oxidation line is about 10.5. During the operation of the oxidation line, water overflows from oxidation tank 4 after each feeding. Therefore, using the overflow water from oxidation tank 4 as the absorbent can meet the requirements. A control system is installed for the pH detection device. When the pH is below 10, the solenoid valve of the pipeline to the second absorbent tank 10 is opened and the solenoid valve of the pipeline to the sewage treatment plant is closed to replenish alkaline absorbent. When the pH is above 11, the solenoid valve of the pipeline to the second absorbent tank 10 is closed and the solenoid valve of the pipeline to the sewage treatment plant is opened, so as to accurately control the pH value of the absorbent. The second absorbent tank 10 is equipped with an overflow port.

[0023] The technical advantages of this invention are as follows: by recycling the overflow wastewater from the first water washing tank after oxidation tank 4 as the absorption and neutralization liquid of alkali mist absorption tower 1, and recycling the overflow wastewater from the first water washing tank after alkali washing tank 2 as the neutralization liquid of acid mist spray absorption tower, the cost of acid and alkali treatment can be effectively reduced, and pollution can be reduced.

[0024] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A waste acid and alkali recycling device for an aluminum profile oxidation line, comprising an alkali mist absorption tower (1) and an alkali washing tank (2) connected to the alkali mist absorption tower (1), and an acid mist absorption tower (3) and an oxidation tank (4) connected to the acid mist absorption tower (3), characterized in that: The alkaline washing tank (2) and the oxidation tank (4) are connected to each other by a pipe. The end of the alkaline washing tank (2) is provided with an alkaline sludge pipe (5) and an alkaline neutralization pipe (6) leading to the sewage treatment station. The end of the oxidation tank (4) is provided with an acid sludge pipe (7) and an acid neutralization pipe (8) leading to the sewage treatment station. The alkaline neutralization pipe (6) and the oxidation tank (4) are connected by a pipe. The acid neutralization pipe (8) is connected to the alkaline washing tank (2). The alkaline neutralization pipe (6) is provided with a first absorption liquid tank (9) connected to the acid mist absorption tower (3). The acid neutralization pipe (8) is provided with a second absorption liquid tank (10) connected to the alkaline mist absorption tower (1). Both the first absorption liquid tank (9) and the second absorption liquid tank (10) are provided with overflow ports.

2. The waste acid and alkali recycling equipment for aluminum profile anodizing lines according to claim 1, characterized in that: The alkaline mist absorption tower (1) is equipped with a first pH detector (11), and both the acid sludge pipe (7) and the acid neutralization pipe (8) are equipped with solenoid valves that are connected to the first pH detector (11).

3. The waste acid and alkali recycling equipment for aluminum profile oxidation lines according to claim 1, characterized in that: The acid mist absorption tower (3) is equipped with a second pH detector (12), and both the alkali-sludge pipe (5) and the alkali neutralization pipe (6) are equipped with solenoid valves that are connected to the signal of the second pH detector (12).

4. The waste acid and alkali recycling equipment for aluminum profile anodizing lines according to claim 1, characterized in that: The outlet of the first absorbent tank (9) is connected to the alkaline contaminant pipe (5), and the outlet of the second absorbent tank (10) is connected to the acid contaminant pipe (7).

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