Acid wastewater recovery device

Abstract

The utility model provides an acid wastewater recovery device, including neutralization acidification kettle, distillation kettle, layering tank, neutralization acidification kettle is connected with distillation kettle through pipeline, distillation kettle is connected with layering tank through pipeline, layering tank is respectively connected with neutralization acidification kettle and recovery pipeline through pipeline. According to the acidic wastewater recovery device, chemical reaction is carried out in the neutralization acidification kettle by utilizing the chemical property of a product to obtain a stable intermediate state, and distillation is carried out by utilizing the solubility difference between the intermediate state of the product and a byproduct salt, so that the byproduct salt is separated out, and the intermediate state of the product is still in a solution state; and a pipeline is mounted at a specific position on the layering tank, a supernatant (product intermediate state) is conveyed to the neutralization acidification kettle for acidification treatment, so that product recovery is realized, and a lower-layer byproduct salt is conveyed to a downstream process for mechanical application.

Description

Technical Field

[0001] The utility model belongs to the field of chemical industry, and in particular relates to an acid wastewater recovery device. Background Art

[0002] A product of our company generates a large amount of acidic wastewater during the production process. The acidic wastewater contains more products and a large amount of by-product salts. In the past, the acidic wastewater was discharged to the environmental protection workshop for disposal, resulting in high product costs and great pressure on environmental protection disposal. Summary of the invention

[0003] In view of this, the utility model aims to overcome the defects in the prior art and proposes an acid wastewater recovery device.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] An acid wastewater recovery device comprises a neutralization acid precipitation kettle, a distillation kettle, and a stratification tank, wherein the neutralization acid precipitation kettle is connected to the distillation kettle through a pipeline, the distillation kettle is connected to the stratification tank through a pipeline, and the stratification tank is respectively connected to the neutralization acid precipitation kettle and the recovery pipeline through pipelines;

[0006] The upper part of the neutralization and acidification kettle is provided with an acid wastewater inlet, an acid and alkali solution inlet and a supernatant liquid reflux port, the lower part of the neutralization and acidification kettle is provided with an intermediate liquid outlet, the stratification tank is connected to the supernatant liquid reflux port through a pipeline, the intermediate liquid outlet is connected to the distillation kettle through a pipeline, and the neutralization and acidification kettle is provided with a first weighing mechanism and a pH meter, the first weighing mechanism is connected to the acid wastewater inlet through a line, and the pH meter is connected to the acid and alkali solution inlet through a line.

[0007] Furthermore, an intermediate liquid inlet and an exhaust port are provided at the upper portion of the distillation kettle, a steam inlet and a concentrated liquid outlet are provided at the lower portion of the distillation kettle, the intermediate liquid outlet is connected to the intermediate liquid inlet via a neutralization acidification pump, the concentrated liquid outlet is connected to the stratification tank via a pipeline, a second weighing mechanism is provided on the distillation kettle, and the second weighing mechanism is connected to the intermediate liquid inlet via a line.

[0008] Furthermore, a concentrated liquid inlet is provided at the top of the stratification tank, a supernatant liquid outlet is provided at the top of the stratification tank, a slurry outlet is provided at the bottom of the stratification tank, the concentrated liquid outlet is connected to the concentrated liquid inlet through a distillation pump, the supernatant liquid outlet is connected to the supernatant liquid reflux port through a stratification pump, the slurry outlet is connected to a recovery pipeline through a recovery pump, and a liquid level gauge is provided on the stratification tank, and the liquid level gauge is connected to the concentrated liquid inlet through a line.

[0009] The height of the stratification tank is 2.6 meters, and the distance between the supernatant outlet and the bottom of the stratification tank is 15-18 centimeters, which is convenient for the stratification of materials.

[0010] Furthermore, a buffer channel is provided at the slurry outlet, and a feed port is provided at the top of the buffer channel and a discharge port is provided at the bottom. The feed port is connected to the slurry outlet, and the discharge port is connected to the recovery pipeline. A buffer component is provided inside the buffer channel.

[0011] Furthermore, the buffer assembly includes a first buffer plate, a second buffer plate, a buffer bending plate, a third buffer plate, and a fourth buffer plate. The longitudinal section of the buffer channel is a side V-shaped structure. One end of the first buffer plate is connected to the feed port, and the other end is connected to the side wall of the buffer channel. One end of the second buffer plate is connected to the middle part of the first buffer plate, and the other end is connected to the side wall of the buffer channel. One end of the fourth buffer plate is connected to the discharge port, and the other end is connected to the side wall of the buffer channel. One end of the third buffer plate is connected to the middle part of the fourth buffer plate, and the other end is connected to the side wall of the buffer channel. One end of the buffer bending plate is connected to the middle part of the second buffer plate, and the other end is connected to the middle part of the third buffer plate. The middle part of the buffer bending plate is connected to the side wall of the buffer channel.

[0012] Furthermore, the angle between the first buffer plate and the horizontal plane is 30-60 degrees, and the angle between the second buffer plate and the horizontal plane is 10-60 degrees. A large angle is formed between the first buffer plate and the feed port, and the diameter of the first buffer plate is larger than the diameter of the feed port, which is convenient for the discharge of materials and provides a buffering effect for the materials. An angle is formed between the second buffer plate and the first buffer plate, and an angle is formed between the buffer bending plate and the second buffer plate, so that the outward expansion slope gradually decreases, which is convenient for the outflow of materials, and then the diameter is gradually reduced through the closing of the third buffer plate and the fourth buffer plate, which is convenient for the discharge of materials in a slurry state.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] The acid wastewater recovery device described in the utility model utilizes the chemical properties of the product to carry out a chemical reaction in a neutralization and acid precipitation kettle to obtain a stable intermediate state, utilizes the solubility difference between the product intermediate state and the by-product salt to carry out distillation, ensures that the by-product salt is precipitated, and the product intermediate state is still in a solution state; and installs a pipeline at a specific position on the stratification tank to transport the supernatant (product intermediate state) to the neutralization and acid precipitation kettle for acidification treatment, thereby realizing product recovery, and the lower layer by-product salt is transported to the downstream process for application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0016] Figure 1 This is a schematic diagram of an acidic wastewater recovery device according to an embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of the buffer channel described in an embodiment of the utility model.

[0018] Description of reference numerals:

[0019] 1. Neutralization and acidification kettle; 2. Distillation kettle; 3. Stratification tank; 11. First weighing mechanism; 12. pH meter; 13. Neutralization and acidification pump; 14. Acid wastewater inlet; 15. Acid and alkali solution inlet; 16. Supernatant liquid reflux port; 17. Intermediate liquid outlet; 21. Second weighing mechanism; 22. Distillation pump; 23. Intermediate liquid inlet; 24. Exhaust port; 25. Steam inlet; 26. Concentrate outlet; 31. Liquid level meter; 32. Stratification pump; 33. Recovery pump; 34. Concentrate inlet; 35. Supernatant liquid outlet; 36. Slurry outlet; 37. Buffer channel; 371. Feed inlet; 372. Discharge port; 373. First buffer plate; 374. Second buffer plate; 375. Buffer bending plate; 376. Third buffer plate; 377. Fourth buffer plate. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0021] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0024] like Figure 1-2 As shown, an acid wastewater recovery device includes a neutralization acidification kettle 1, a distillation kettle 2, and a stratification tank 3. The neutralization acidification kettle 1 is connected to the distillation kettle 2 through a pipeline, the distillation kettle 2 is connected to the stratification tank 3 through a pipeline, and the stratification tank is respectively connected to the neutralization acidification kettle 1 and the recovery pipeline through pipelines; the upper part of the neutralization acidification kettle 1 is provided with an acid wastewater inlet 14, an acid and alkali solution inlet 15 and a supernatant liquid reflux port 16, the lower part of the neutralization acidification kettle 1 is provided with an intermediate liquid outlet 17, the stratification tank 3 is connected to the supernatant liquid reflux port 16 through a pipeline, and the intermediate liquid outlet 17 is connected to the distillation kettle 2 through a pipeline, and the neutralization acidification kettle 1 is provided with a first weighing mechanism 11 and a pH meter 12, the first weighing mechanism 11 is connected to the acid wastewater inlet 14 through a line, and the pH meter 12 is connected to the acid and alkali solution inlet 15 through a line.

[0025] The upper part of the distillation kettle 2 is provided with an intermediate liquid inlet 23 and an exhaust port 24, the lower part of the distillation kettle 2 is provided with a steam inlet 25 and a concentrated liquid outlet 26, the intermediate liquid outlet 17 is connected to the intermediate liquid inlet 23 through the neutralization acidification pump 13, the concentrated liquid outlet 26 is connected to the stratification tank 3 through a pipeline, and the distillation kettle 2 is provided with a second weighing mechanism 21, and the second weighing mechanism 21 is connected to the intermediate liquid inlet 23 through a line. The first weighing mechanism 11 and the second weighing mechanism 21 are both commercially available conventional weighing modules.

[0026] The upper part of the stratification tank 3 is provided with a concentrated liquid inlet 34, the upper part of the stratification tank 3 is provided with a supernatant liquid outlet 35, the bottom of the stratification tank 3 is provided with a slurry outlet 36, the concentrated liquid outlet 26 is connected to the concentrated liquid inlet 34 through the distillation pump 22, the supernatant liquid outlet 35 is connected to the supernatant liquid reflux port 16 through the stratification pump 32, the slurry liquid outlet 36 is connected to the recovery pipeline through the recovery pump 33, and the stratification tank 3 is provided with a liquid level meter 31, and the liquid level meter 31 is connected to the concentrated liquid inlet 34 through a line. The height of the stratification tank 3 is 2.6 meters, and the supernatant liquid outlet 35 is 16 centimeters away from the bottom of the stratification tank 3. It is convenient for the stratification of materials.

[0027] A buffer channel 37 is provided at the slurry outlet 36. The buffer channel 37 has a feed port 371 at the top and a discharge port 372 at the bottom. The feed port 371 is connected to the slurry outlet 36, and the discharge port 372 is connected to the recovery pipeline. A buffer component is provided inside the buffer channel 37.

[0028] The buffer assembly includes a first buffer plate 373, a second buffer plate 374, a buffer bending plate 375, a third buffer plate 376, and a fourth buffer plate 377. The longitudinal section of the buffer channel 37 is a side V-shaped structure. One end of the first buffer plate 373 is connected to the feed port 371, and the other end is connected to the side wall of the buffer channel 37. One end of the second buffer plate 374 is connected to the middle of the first buffer plate 373, and the other end is connected to the side wall of the buffer channel 37. One end of the fourth buffer plate 377 is connected to the discharge port 372, and the other end is connected to the side wall of the buffer channel 37. One end of the third buffer plate 376 is connected to the middle of the fourth buffer plate 377, and the other end is connected to the side wall of the buffer channel 37. One end of the buffer bending plate 375 is connected to the middle of the second buffer plate 374, and the other end is connected to the middle of the third buffer plate 376. The middle of the buffer bending plate 375 is connected to the side wall of the buffer channel 37. The angle between the first buffer plate 373 and the horizontal plane is 45 degrees, and the angle between the second buffer plate 374 and the horizontal plane is 80 degrees. A large angle is formed between the first buffer plate 373 and the feed port 371. The diameter of the first buffer plate 373 is larger than the diameter of the feed port 371, which facilitates the discharge of materials and provides a buffering effect for the materials. An angle is formed between the second buffer plate 374 and the first buffer plate 373, and an angle is formed between the buffer bending plate 375 and the second buffer plate 374, so that the outward expansion slope gradually decreases, which facilitates the outflow of materials. Then, through the closing of the third buffer plate 376 and the fourth buffer plate 377, the diameter is gradually reduced, which facilitates the discharge of materials in a slurry state.

[0029] The acid wastewater recovery device is suitable for acid wastewater containing products and by-products in the production process, and requires the recovered products or intermediate products to have good stability and higher solubility than by-product salts. In the past production process, acid wastewater was directly discharged to environmental protection disposal, resulting in waste of products and by-product salts in the wastewater, and increasing environmental protection disposal costs.

[0030] The device installs a first weighing mechanism 11 on the neutralization acid precipitation kettle 1, which is weight-interlocked with the feed cut-off valve of the workshop acid wastewater, and installs an online pH meter 12, which is respectively interlocked with the liquid alkali, hydrochloric acid feed cut-off valve, and feed cut-off valve; uses a distillation kettle for concentration treatment, and installs a second weighing mechanism 21, which is weight-interlocked with the alkaline neutralization liquid feed cut-off valve; uses a stratification tank 3 for solid-liquid stratification, installs a liquid level meter 31, which is liquid-level interlocked with the alkaline concentrated liquid feed cut-off valve, and installs a pipeline at a specific position of the stratification tank 3 to transport the supernatant (product intermediate state) to the neutralization acid kettle for product recovery, and transports the lower by-product salt to the downstream process for application, so as to achieve product recovery and by-product application effects.

[0031] Implementation process:

[0032] The acidic wastewater is transported to the neutralization and acidification kettle 1. When the weight reaches the set value, the shut-off valve of the acidic wastewater is closed, and the shut-off valve of the liquid alkali is opened. When the pH reaches the set value, the liquid alkali shut-off valve is closed and transported to the distillation kettle 2 through the neutralization and acidification pump 13. When the weight reaches the set value, the intermediate liquid inlet 23 shut-off valve is closed. When concentrated to 65%, the concentration is stopped and the concentrated liquid is transported to the stratification tank 3 through the distillation pump 22. When the liquid level of the stratification tank 3 reaches the set value, the concentrated liquid inlet 34 shut-off valve is closed. After standing for 1 hour, the supernatant (product intermediate state) is transported to the neutralization and acidification kettle 1 by the stratification pump 32, and the hydrochloric acid feed shut-off valve is opened for acidification treatment. The obtained solid-liquid mixture is centrifuged to obtain a recovered product; the lower layer slurry (by-product salt) of the stratification tank 3 is transported to the downstream process by the recovery pump 33 for application, so as to realize the recovery and application of products and by-products in the wastewater.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An acid wastewater recovery device, characterized in that: It includes a neutralization acid precipitation kettle, a distillation kettle, and a stratification tank, wherein the neutralization acid precipitation kettle is connected to the distillation kettle through a pipeline, the distillation kettle is connected to the stratification tank through a pipeline, and the stratification tank is respectively connected to the neutralization acid precipitation kettle and a recovery pipeline through pipelines; The upper part of the neutralization and acidification kettle is provided with an acid wastewater inlet, an acid and alkali solution inlet and a supernatant liquid reflux port, the lower part of the neutralization and acidification kettle is provided with an intermediate liquid outlet, the stratification tank is connected to the supernatant liquid reflux port through a pipeline, the intermediate liquid outlet is connected to the distillation kettle through a pipeline, and the neutralization and acidification kettle is provided with a first weighing mechanism and a pH meter, the first weighing mechanism is connected to the acid wastewater inlet through a line, and the pH meter is connected to the acid and alkali solution inlet through a line.

2. The acid wastewater recovery device according to claim 1, characterized in that: An intermediate liquid inlet and an exhaust port are provided at the upper part of the distillation kettle, a steam inlet and a concentrated liquid outlet are provided at the lower part of the distillation kettle, the intermediate liquid outlet is connected to the intermediate liquid inlet through a neutralization acidification pump, the concentrated liquid outlet is connected to the stratification tank through a pipeline, and a second weighing mechanism is provided on the distillation kettle, and the second weighing mechanism is connected to the intermediate liquid inlet through a line.

3. The acid wastewater recovery device according to claim 2, characterized in that: A concentrated liquid inlet is arranged on the upper part of the stratification tank, a supernatant liquid outlet is arranged on the upper part of the stratification tank, a slurry outlet is arranged on the bottom of the stratification tank, the concentrated liquid outlet is connected to the concentrated liquid inlet through a distillation pump, the supernatant liquid outlet is connected to the supernatant liquid reflux port through a stratification pump, the slurry outlet is connected to a recovery pipeline through a recovery pump, a liquid level gauge is arranged on the stratification tank, and the liquid level gauge is connected to the concentrated liquid inlet through a line.

4. The acid wastewater recovery device according to claim 3, characterized in that: A buffer channel is provided at the slurry outlet. The buffer channel has a feed port at the top and a discharge port at the bottom. The feed port is connected to the slurry outlet, and the discharge port is connected to the recovery pipeline. A buffer component is provided inside the buffer channel.

5. The acid wastewater recovery device according to claim 4, characterized in that: The buffer assembly includes a first buffer plate, a second buffer plate, a buffer bending plate, a third buffer plate, and a fourth buffer plate. The longitudinal section of the buffer channel is a side V-shaped structure. One end of the first buffer plate is connected to the feed port, and the other end is connected to the side wall of the buffer channel. One end of the second buffer plate is connected to the middle part of the first buffer plate, and the other end is connected to the side wall of the buffer channel. One end of the fourth buffer plate is connected to the discharge port, and the other end is connected to the side wall of the buffer channel. One end of the third buffer plate is connected to the middle part of the fourth buffer plate, and the other end is connected to the side wall of the buffer channel. One end of the buffer bending plate is connected to the middle part of the second buffer plate, and the other end is connected to the middle part of the third buffer plate. The middle part of the buffer bending plate is connected to the side wall of the buffer channel.

6. The acid wastewater recovery device according to claim 5, characterized in that: The angle between the first buffer plate and the horizontal plane is 30-60 degrees, and the angle between the second buffer plate and the horizontal plane is 10-60 degrees.

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