CN217025654U

CN217025654U - Waste acid liquid recycling treatment system for anodic oxidation plant

Info

Publication number: CN217025654U
Application number: CN202220563709.2U
Authority: CN
Inventors: 吴思国; 朱子岳; 郑赢忠; 胡平; 彭淦; 罗骥
Original assignee: Shenzhen Ruisai Environmental Protection Technology Co ltd
Current assignee: Shenzhen Ruisai Environmental Protection Technology Co ltd
Priority date: 2022-03-15
Filing date: 2022-03-15
Publication date: 2022-07-22
Anticipated expiration: 2032-03-15

Abstract

The utility model provides a waste acid liquid recycling treatment system of an anodic oxidation plant, which comprises a filtering device, a waste acid liquid treatment device and an evaporation device which are connected in sequence, wherein the filtering device comprises a two-stage filter connected with an outlet of a waste acid liquid pool, and the two-stage filter is respectively connected with the waste acid liquid pool and a stock solution collecting barrel; the waste acid liquid treatment device comprises a filling tank, a pure water collecting barrel, a primary recycling acid collecting barrel and a waste liquid pool, wherein the bottom of the filling tank is respectively connected with a stock solution collecting barrel and the primary recycling acid collecting barrel, and the top of the filling tank is respectively connected with the pure water collecting barrel and the waste liquid pool; the evaporation device comprises a low-temperature evaporator and a high-temperature evaporator, the low-temperature evaporator is connected with the first-level recycling acid collecting barrel and the second-level recycling acid collecting barrel, and the high-temperature evaporator is connected with the second-level recycling acid collecting barrel and the third-level recycling acid collecting barrel. The utility model can effectively remove grease, suspended matters and metal ions in the waste acid liquid, can obtain recycled inorganic acid with high specific gravity, and reduces the treatment cost and the production cost of the waste acid liquid.

Description

Waste acid liquid recycling treatment system for anodic oxidation plant

Technical Field

The utility model belongs to the field of waste acid liquid treatment, and particularly relates to a waste acid liquid recycling treatment system.

Background

In metal finishing industry, strong inorganic acid (sulfuric acid, nitric acid, phosphoric acid, etc.) is commonly used to chemically polish a workpiece to oxidize the surface of the workpiece, so as to achieve the purpose of improving the surface roughness of the workpiece or smoothing and glossing the surface. However, as the concentration of dissolved metal increases during chemical polishing, the concentration of free acid decreases, which can result in the workpiece failing to meet process standards. Although the problem of insufficient acidity can be remedied by adding new inorganic acid to the polishing solution, when the metal concentration increases to a certain extent, the polishing solution must be replaced, and a spent acid solution is produced. The direct discharge of these waste acid solutions can cause great environmental pollution, and if the waste acid solutions are treated, a large amount of chemicals are consumed, so that the cost is high.

At present, the acid industrial waste acid liquid is treated by a chemical neutralization method, a membrane method and an ion exchange method. The chemical neutralization method usually adopts a method of adding drugs for neutralization and flocculation precipitation, but the cost of the drugs and the cost of sludge treatment are high, and useful substances in the waste acid liquor cannot be recovered, so that the resource waste is caused. The membrane treatment technology has many limitations in treating waste acid liquor with complex components, and often has the problems of membrane blockage or treatment failure to reach the standard and the like. The inorganic ions in the acid pickle liquor can be separated by treating the acid pickle liquor by an ion exchange method, and the separated solution can be recycled. However, the key of this treatment method is to select an ion exchanger, and the selection of the type of ion exchange resin and the ion removal rate are different according to the different components of the waste acid solution, and if the acid solution after filtration is recycled, evaporation and concentration are also required. However, the concentrated solution of the conventional evaporation concentration equipment has a specific gravity of only about 1.6, which cannot meet the requirement of acid for workshops, and has the problems of high energy consumption, low efficiency and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provides a waste acid recycling treatment system for an anodic oxidation plant.

The utility model provides a waste acid liquid recycling treatment system for an anodic oxidation plant, which comprises a filtering device, a waste acid liquid treatment device and an evaporation device which are sequentially connected, wherein the filtering device comprises a two-stage filter connected with an outlet of a waste acid liquid pool, an inlet of the two-stage filter is connected with the waste acid liquid pool, and an outlet of the two-stage filter is connected with a stock solution collecting barrel; the waste acid liquid treatment device comprises a filler tank, a pure water collecting barrel, a primary recycling acid collecting barrel and a waste liquid pool, wherein the bottom of the filler tank is respectively connected with the stock solution collecting barrel and the primary recycling acid collecting barrel, and the top of the filler tank is respectively connected with the pure water collecting barrel and the waste liquid pool; the evaporation plant comprises a low-temperature evaporator and a high-temperature evaporator, wherein the inlet of the low-temperature evaporator is connected with the first-level recycling acid collecting barrel, the outlet of the low-temperature evaporator is connected with the inlet of the second-level recycling acid collecting barrel, the outlet of the second-level recycling acid collecting barrel is connected with the inlet of the high-temperature evaporator, and the outlet of the high-temperature evaporator is connected with the third-level recycling acid collecting barrel.

Optionally, the two-stage filter includes an activated carbon filter and a bag filter connected in series, an inlet of the activated carbon filter is connected to the waste acid liquid pool, and an outlet of the bag filter is connected to the raw liquid collecting barrel.

Optionally, the low-temperature evaporator and the high-temperature evaporator both comprise a cold and hot combined supply system and a vacuum generator, the cold and hot combined supply system comprises an evaporation kettle, a condenser, a compressor, an expansion valve and a coil, and the vacuum generator comprises an ejector, a circulating water tank and a circulating water pump which are connected in sequence.

Optionally, a first high-low liquid level sensor is arranged in the stock solution collecting barrel.

Optionally, a second high-low liquid level sensor is arranged in the pure water collecting barrel.

Optionally, a third high-low liquid level sensor, a fourth high-low liquid level sensor and a fifth high-low liquid level sensor are respectively arranged in the primary recycling acid collecting barrel, the secondary recycling acid collecting barrel and the tertiary recycling acid collecting barrel.

Optionally, a first pH meter is arranged on a pipeline connected between the filler tank and the waste liquid tank; and a second pH meter is arranged on a pipeline connected between the filling tank and the first-stage recycling acid collecting barrel.

Optionally, a first flow meter is arranged on a pipeline connected between the filling tank and the stock solution collecting barrel.

Optionally, a second flowmeter is arranged on a pipeline connected between the pure water collecting barrel and the filling tank.

The waste acid solution treated by the anodic oxidation plant is purified by the secondary filter, grease and impurities in the waste acid solution can be removed, impurity ions are removed by secondary purification of the filler tank, the ion removal rate can reach 60-80%, and finally, the waste acid solution is subjected to in-situ harmless treatment by low-temperature and high-temperature two-stage evaporation concentration.

The utility model is suitable for anodic oxidation industry, steel pickling industry and other acid application industries, can control pollutants such as total phosphorus, total nitrogen (ammonia nitrogen), metal ions, salt and the like from the source, prevents high-concentration pollutants from entering a wastewater treatment system, greatly reduces the usage amount of wastewater treatment agents and the generation amount of sludge, has the advantages of low operation cost, full-automatic operation, high acid recovery rate and the like, and simultaneously recycles the treated waste acid liquid, thereby not only reducing the treatment cost and the production cost of the waste acid liquid, improving the economic benefit, creating conditions for resource maximization, but also reducing the pollution to the environment when the waste acid liquid is treated, and meeting the requirements of the waste acid liquid treatment on enterprises at present.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and do not limit the utility model.

It will be understood that when an element is referred to as being "connected," "disposed" or "disposed" to another element, it can be directly on the other element or intervening elements may also be present.

It should also be noted that the terms "top" and "bottom" as used herein in the embodiments of the present invention are used in a relative sense or with reference to the normal use of the product or to the position of the product as illustrated in the drawings, and are used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or component being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting.

Referring to fig. 1, an embodiment of the present invention provides a system for recycling and treating a spent acid solution in an anodic oxidation plant, which comprises a filtering device 1, a spent acid solution treatment device 2, and an evaporation device 3 connected in sequence, the filter device 1 comprises a two-stage filter, in the illustrated embodiment an activated carbon filter 11 and a bag filter 12, used for removing oil and impurities, the activated carbon filter 11 is provided with a pressure gauge 111, the bag filter 12 is provided with a pressure gauge 112, the two are mutually connected in series and communicated, a control valve 112 is arranged on the communicated pipeline, the inlet of the active carbon filter 11 is connected with the outlet of the waste acid liquid pool 13,

control valves

141 and 142 and a pump 14 are arranged on a pipeline connected with the bag filter 12, the outlet of the bag filter is connected with a stock solution collecting barrel 15, a first high-low liquid level sensor 151 is arranged in the stock solution collecting barrel, and a control valve 122 is arranged on a pipeline communicated with the bag filter 12. The waste acid solution discharged from the anode oxidation plant workshop is collected into the waste acid solution tank 13, the control valve 141 and the control valve 142 are opened, the waste acid solution enters the activated carbon filter 11 from the waste acid solution tank 13 through a pipeline under the action of the pump 14 to carry out primary oil removal and impurity removal, and consumables in the activated carbon filter 11 are replaced when the pressure value of the pressure gauge 111 reaches a rated value. When the control valve 112 is opened, the waste acid liquid is subjected to secondary impurity removal through the bag filter 12, and when the pressure value of the pressure gauge 121 reaches a rated value, consumable materials in the bag filter 12 are replaced. When the control valve 122 is opened, the waste acid solution after the secondary filtration enters the raw solution collecting barrel 15 through the pipeline, and when the liquid level in the raw solution collecting barrel 15 reaches a high liquid level under the detection of the first high-low liquid level sensor 151, the pump 14 and the control valve 141 are closed, so that the waste acid solution stops entering the activated carbon filter 11 and the bag filter 12. The waste acid liquid is subjected to primary coarse filtration by an activated carbon filter 11 and secondary fine filtration by a bag filter 12, so that grease, suspended matters, impurities and the like in the waste acid liquid are removed.

Referring to fig. 1 again, the waste acid liquid treatment device 2 includes a filler tank 21, a pure water collection tank 24, a primary recycling acid collection tank 28, and a waste liquid pool 27; the filling tank 21 is of a cylindrical structure with an inner cavity, strong-alkaline anion resin is filled in the inner cavity and used for removing metal ions in the waste acid liquid, and an anticorrosive layer is coated on the outer wall of the filling tank; the upper and lower surfaces of the inner cavity of the packing tank 21 are both provided with splitter plates, the upper and lower surfaces of each splitter plate are both covered with filter screens, and the filter screens and the splitter plates are both made of PP (polypropylene) or Teflon materials, so that the packing tank has better acid corrosion resistance. The bottom of the filling tank 21 is provided with two connectors which are respectively connected with the outlet of the stock solution collecting barrel 15 and the inlet of the primary recycling acid collecting barrel 28, and the opening and the closing are controlled by a liquid inlet valve 222 and a liquid outlet valve 271. A pump 22,

control valves

152 and 221 and a first flow meter 23 are arranged on a pipeline connecting the filling tank 21 and the stock solution collecting barrel 15, a third high-low liquid level sensor 283 is arranged on the primary recycling acid collecting barrel 28, and a second pH meter 282 is arranged on a pipeline between the first high-low liquid level sensor and the bottom of the filling tank 21; the liquid at the top of the filling tank 21 is also provided with two connectors which are respectively connected with the outlet of the pure water collecting barrel 24 and the inlet of the waste liquid pool 27, and the opening and the closing are controlled by a liquid inlet valve 253 and a liquid outlet valve 271. A pressure gauge 241 is arranged on the pure water collecting barrel 24, a second high-low liquid level sensor 241 is arranged in the pure water collecting barrel 24, and a pump 25,

control valves

251 and 252 and a second flow meter 26 are arranged on a pipeline connecting the pure water collecting barrel 24 and the filler tank 21; a first pH meter is arranged on a pipeline connected between the filling tank 21 and the waste liquid tank 27. After the waste acid liquid is subjected to primary coarse filtration and secondary fine filtration, the pump 22 and the

control valves

152 and 221 are opened, the flow rate of the raw liquid entering the first flow meter 23 is adjusted to be 400-plus 600L/h, the waste acid liquid in the raw liquid collecting barrel 15 enters the filling tank 21 from the liquid inlet valve 222 at the bottom of the filling tank 21 through a pipeline, the waste acid liquid flows in the filling tank 21 from bottom to top, so that acid radical ions can be accumulated at the bottom of the filling tank 21, and the waste acid liquid containing impurity metal ions is discharged from the top of the filling tank 21 to the waste liquid pool 27 through the liquid discharge valve 271 for independent treatment. When the first pH meter 272 shows a pH value of 1.0 to 2.5, the pump 22, the liquid inlet valve 222 and the liquid outlet valve 271 are closed, and the waste acid liquid is stopped from entering the filling tank 21. At this time, the pump 25 and the

control valves

251 and 252 are turned on, the flow rate of pure water entering the second flow meter 26 is adjusted to 400-. The pure water in the pure water collection bucket 24 enters the filler tank 21 through a pipeline, and the pure water enters the filler tank 21 through the top liquid inlet valve 253 of the filler tank 21. The pure water flows from top to bottom in the filler tank 21, so that acid radical ions can be washed out from the filler tank 21, and the pure acid liquid is discharged to the primary recycling acid collecting barrel 28 through the liquid discharge valve 281. When the second pH meter 282 shows a pH value of 0.5 to 1.5, the pump 25, the liquid inlet valve 253 and the liquid discharge valve 281 are closed, the pure water is stopped from entering the filler tank 21, and the pure water is controlled by a third high-low liquid level sensor 283 arranged on the primary recycling acid collecting barrel 28, and when the pure water is at a high liquid level, the liquid inlet valve 253 and the liquid discharge valve 281 are closed.

Referring to fig. 1 again, the evaporation apparatus 3 includes a low-temperature evaporator 31 and a high-temperature evaporator 32, the low-temperature evaporator 31 and the high-temperature evaporator 32 both include a combined cooling and heating system and a vacuum generator, the combined cooling and heating system includes an evaporation kettle, a condenser, a compressor, an expansion valve and a coil pipe combined system (not shown), and the vacuum generator includes an ejector, a circulating water tank and a circulating water pump (not shown) connected in sequence via a pipeline. An inlet of a low-temperature evaporator 31 is connected with a first-level reuse acid collecting barrel 28, a liquid inlet valve 311 is arranged on a pipeline connected with the low-temperature evaporator, an outlet of the low-temperature evaporator 31 is connected with an inlet of a second-level reuse acid collecting barrel 33, a liquid outlet valve 331 is arranged on a pipeline communicated with the low-temperature evaporator and the low-temperature evaporator, a fourth high-low liquid level sensor 332 is arranged on the second-level reuse acid collecting barrel 33, an outlet of the second-level reuse acid collecting barrel 33 is connected with an inlet of a high-temperature evaporator 32, a liquid inlet valve 321 is arranged on a pipeline connected with the high-temperature evaporator 32, an outlet of the high-temperature evaporator 32 is connected with a third-level reuse acid collecting barrel 34, a liquid outlet valve 341 is arranged on a pipeline communicated with the high-temperature evaporator and the third-level reuse acid collecting barrel 34, and a fifth high-low liquid level sensor 342 is arranged on the third-level reuse acid collecting barrel 34. After the treatment by the waste acid solution treatment device 2, when the pure acid solution collected by the primary recycling acid collection tank 28 reaches a set liquid level, the low-temperature evaporator 31 is started, and under a negative pressure condition, the liquid inlet valve 311 is opened to extract the recycling acid in the primary recycling acid collection tank 28 to enter the low-temperature evaporator 31. When the acid liquor in the low-temperature evaporator 31 reaches a high liquid level, stopping feeding the liquid, closing the liquid feeding valve 311, performing low-temperature evaporation concentration at the evaporation temperature of 30-40 ℃, opening the liquid feeding valve 311 for liquid supplement until the liquid level is low, circulating in such a way until the specific gravity of the concentrated liquid in the low-temperature evaporator 31 meets the liquid drainage standard, opening the liquid drainage valve 331 at the moment, draining the concentrated liquid into the secondary recycling acid collecting barrel 33, and closing the liquid drainage valve 331 when a fourth high-low liquid level sensor 332 in the secondary recycling acid collecting barrel 33 detects that the liquid level reaches the high liquid level. At this time, the high temperature evaporator 32 is opened, and the recycling acid in the secondary recycling acid collecting tank 33 is pumped into the high temperature evaporator 32 by opening the liquid inlet valve 321 under the negative pressure condition. When the acid liquor in the high-temperature evaporator 32 reaches a high liquid level, stopping feeding the liquid, closing the liquid feeding valve 321, performing high-temperature evaporation concentration at the evaporation temperature of 40-60 ℃, opening the liquid feeding valve 321 for liquid supplement until the liquid level is low, circulating in such a way until the specific gravity of the concentrated liquid in the high-temperature evaporator 32 meets the liquid discharge standard, opening the liquid discharge valve 341, discharging the concentrated liquid into the third-stage recycling acid collecting barrel 34, and closing the liquid discharge valve 341 when a fifth high-low liquid level sensor 342 in the third-stage recycling acid collecting barrel 34 detects the high liquid level, thereby completing the purification and concentration treatment process of the whole waste acid liquor by industrially throwing in the anodic oxidation plant, and meeting the recycling requirements of a workshop.

The control valve, the liquid inlet valve and the liquid outlet valve which are arranged in each pipeline (pipeline) are all electromagnetic valves, and the valves are electrically connected with a PLC control circuit.

The recycling treatment system for the waste acid liquor of the anodic oxidation plant provided by the utility model can effectively remove grease, suspended matters and metal ions in the waste acid liquor, recover useful inorganic acid, reduce the treatment cost and the production cost of the waste acid liquor, improve the efficiency by adopting a treatment device combining multi-stage purification and concentration, obtain the recycled acid with high specific gravity and achieve better social benefit and economic benefit.

The above-described embodiments of the present invention are merely exemplary and not intended to limit the present invention, and those skilled in the art may make various modifications, substitutions and improvements without departing from the spirit of the present invention.

Claims

1. The system for recycling and treating the waste acid liquid in the anodic oxidation plant is characterized by comprising a filtering device, a waste acid liquid treating device and an evaporating device which are connected in sequence, wherein the filtering device comprises a two-stage filter connected with an outlet of a waste acid liquid pool, an inlet of the two-stage filter is connected with the waste acid liquid pool, and an outlet of the two-stage filter is connected with a stock solution collecting barrel; the waste acid liquid treatment device comprises a filler tank, a pure water collecting barrel, a primary recycling acid collecting barrel and a waste liquid pool, wherein the bottom of the filler tank is respectively connected with the stock solution collecting barrel and the primary recycling acid collecting barrel, and the top of the filler tank is respectively connected with the pure water collecting barrel and the waste liquid pool; the evaporator comprises a low-temperature evaporator and a high-temperature evaporator, wherein the inlet of the low-temperature evaporator is connected with the first-level reuse acid collecting barrel, the outlet of the low-temperature evaporator is connected with the inlet of the second-level reuse acid collecting barrel, the outlet of the second-level reuse acid collecting barrel is connected with the inlet of the high-temperature evaporator, and the outlet of the high-temperature evaporator is connected with the third-level reuse acid collecting barrel.

2. The recycling treatment system for acid pickle of anodic oxidation plant of claim 1, wherein the two-stage filter comprises an activated carbon filter and a bag filter connected in series, the inlet of the activated carbon filter is connected to the acid pickle tank, and the outlet of the bag filter is connected to the raw liquid collecting barrel.

3. The recycling treatment system for waste acid liquor of anodic oxidation plant of claim 1, wherein the filler tank is cylindrical, the filler tank is filled with strongly basic anion resin, and the outer wall of the filler tank is coated with an anti-corrosion layer; the inner cavity of the packing tank is provided with a splitter plate from top to bottom, and the upper surface and the lower surface of the splitter plate are both covered with filter screens.

4. The system for recycling and treating waste acid liquor of an anodic oxidation plant according to claim 1, wherein the low-temperature evaporator and the high-temperature evaporator each comprise a combined cooling and heating system and a vacuum generator, the combined cooling and heating system comprises an evaporation kettle, a condenser, a compressor, an expansion valve and a coil, and the vacuum generator comprises an ejector, a circulating water tank and a circulating water pump which are connected in sequence.

5. The system of claim 1, wherein a first high/low liquid level sensor is disposed in the raw liquid collection tank.

6. The system of claim 1, wherein a second high-low liquid level sensor is disposed in the pure water collection tank.

7. The recycling treatment system for waste acid liquor of anodic oxidation plant of claim 1, wherein a third high and low liquid level sensor, a fourth high and low liquid level sensor and a fifth high and low liquid level sensor are respectively arranged in the primary recycling acid collecting barrel, the secondary recycling acid collecting barrel and the tertiary recycling acid collecting barrel.

8. The recycling treatment system for acid pickle of anodic oxidation plant of claim 1 or 3, wherein a first pH meter is disposed on the pipeline connecting the filling tank and the waste liquid pool; and a second pH meter is arranged on a pipeline connected between the filling tank and the first-stage recycling acid collecting barrel.

9. The system for recycling and treating acid pickle of anodic oxidation plant of claim 1, 3 or 5, wherein a first flow meter is disposed on the pipeline connected between the filling tank and the stock solution collecting barrel.

10. The recycling system of acid pickle of anodic oxidation plant of claim 1, 3 or 6, wherein a second flow meter is provided on the pipeline connecting between said pure water collection tank and said filler tank.