Acid pickling process waste acid treatment device

Abstract

The utility model discloses a waste acid treatment device for a pickling process, and relates to the field of pickling processes. A pickling process waste acid treatment device comprises a heating tank used for heating and concentrating a waste acid solution, the upper end of the heating tank is communicated with a feeding valve pipe and a pressure relief valve pipe, and the bottom of the heating tank is communicated with a discharging valve pipe; the separation mechanism is used for removing impurities from the concentrated waste acid solution and is arranged below the heating tank; the waste acid recycling device can effectively evaporate and concentrate waste acid generated by a pickling process, so that impurities in the waste acid are crystallized and separated out, the waste acid and the impurities are separated through the intercepting filter plate, and conditions are created for recycling the waste acid; the intercepting filter plate can vibrate, impurities are prevented from blocking filter holes, it is guaranteed that the separation process is continuously and stably carried out, and the separation efficiency is improved.

Description

A waste acid treatment device for pickling process Technical Field

[0001] This utility model belongs to the field of pickling process technology, specifically, it relates to a device for treating waste acid from pickling processes. Background Technology

[0002] In the pickling process, the treatment of waste acid has always been a crucial and important aspect that has received much attention. Currently, pickling is widely used in many industries such as metal processing and surface treatment, mainly to remove impurities such as oxide scale and rust from metal surfaces in order to improve the surface quality of metals and the effect of subsequent processing or coating. However, the pickling process generates a large amount of waste acid.

[0003] There are various traditional methods for treating waste acid, such as evaporation and concentration, oxidation, extraction, membrane separation, and chemical neutralization. Among them, chemical neutralization is the most convenient, requiring only the addition of an alkaline solution for stirring and filtration. This method is widely used due to its low cost and high efficiency in subsequent treatment. However, this method not only wastes a large amount of recyclable acid resources during the process, but also generates a large amount of saline wastewater, increasing the burden and cost of subsequent wastewater treatment. Furthermore, it does not meet increasingly stringent environmental protection requirements.

[0004] Some companies use evaporation and concentration to treat waste acid, but in the process, they face problems such as incomplete removal of impurities and easy clogging of separation equipment. Existing separation equipment often cannot efficiently separate crystalline impurities from acid liquid in concentrated waste acid. Moreover, after long-term operation, impurities are prone to clogging filter components, resulting in a significant decrease in equipment processing efficiency and the need for frequent shutdowns for cleaning, which seriously affects the continuity and stability of production. In view of this, this utility model is proposed. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide an acid pickling process waste acid treatment device that can overcome or at least partially solve the above problems.

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows: a waste acid treatment device for pickling process, comprising: a heating tank for heating and concentrating the waste acid solution, wherein the upper end of the heating tank is connected to a feeding valve pipe and a pressure relief valve pipe, and the bottom of the heating tank is connected to a discharge valve pipe; a separation mechanism for removing impurities from the concentrated waste acid solution, disposed below the heating tank; the separation mechanism includes a separation shell, an intercepting filter plate, an annular rotating plate, a triangular block, and rollers; the separation shell is disposed directly below the discharge valve pipe, and a discharge pipe is connected to the lower end of one side of the separation shell; the intercepting filter plate is slidably connected to the separation shell; the annular rotating plate is rotatably connected to the separation shell and located below the intercepting filter plate; the triangular block is fixedly connected to the annular rotating plate at equal intervals in a circle; the rollers are rotatably connected to the lower side of the intercepting filter plate at equal intervals in a circle and roll on the annular rotating plate; and a driving part for driving the annular rotating plate to rotate is provided on the separation shell.

[0007] Furthermore, the drive unit includes a conical gear ring, a bevel gear, and a drive motor. The conical gear ring is fixedly connected to the bottom of the annular rotating plate. The bevel gear is circumferentially and equidistantly connected to the inner wall of the separation shell and meshes with the conical gear ring. The drive motor is fixedly connected to one side of the separation shell, and its output end is fixedly connected to an adjacent bevel gear.

[0008] To facilitate the natural sliding of impurities towards the edge, making centralized cleaning easier and reducing the frequency and difficulty of manual cleaning, the interception filter plate is further described as a conical filter plate.

[0009] To facilitate the blocking of impurities, reduce their contact with the inner wall of the separation shell, make it easier to keep the inside of the equipment clean, and reduce maintenance costs and time, a ring-shaped collection box is fixedly connected to the outer side of the interception filter plate, and the rollers are installed at the bottom of the ring-shaped collection box.

[0010] To facilitate vibration of the heating tank, improve the discharge efficiency of concentrated waste acid and crystalline impurities, and enhance the uniformity of the waste acid solution during heating, the annular collection box is further equipped with multiple connecting rods fixedly connected at equal intervals around its circumference, with the upper ends of the connecting rods fixedly connected to the heating tank.

[0011] To ensure smoother movement of the heating tube and the filter plate, a base is further included. The separation shell is fixedly mounted on the base, and a limiting plate is fixedly connected to the top of the base via a support rod. The heating tank is vertically slidably connected to the limiting plate. Multiple limiting strips are fixedly connected in a circumferentially equidistant manner around the outer edge of the heating tank. Multiple sliding grooves that cooperate with the limiting strips are circumferentially equidistantly opened on the limiting plate.

[0012] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: The present invention can effectively evaporate and concentrate the waste acid generated by the pickling process, so that the impurities in the waste acid crystallize out, and separate the waste acid from the impurities through the interception filter plate, creating conditions for the reuse of waste acid. Through the mechanical structure composed of drive motor, bevel gear, bevel gear ring, annular rotating plate, triangular block and roller, the interception filter plate can vibrate to prevent impurities from clogging the filter holes, ensure the continuous and stable operation of the separation process, and improve the separation efficiency.

[0013] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0014] In the attached diagram:

[0015] Figure 1 is a schematic diagram of the structure of this utility model;

[0016] Figure 2 is a schematic diagram of the separation mechanism of this utility model;

[0017] Figure 3 is a schematic diagram of the internal structure of the separation shell of this utility model;

[0018] Figure 4 is a schematic diagram of the internal structure of the separation shell of this utility model.

[0019] In the diagram: 1. Heating tank; 101. Feeding valve pipe; 102. Pressure relief valve pipe; 103. Discharge valve pipe; 104. Limiting strip; 2. Separation shell; 201. Discharge pipe; 202. Interception filter plate; 203. Annular collection box; 204. Annular rotating plate; 205. Triangular block; 206. Roller; 207. Conical gear ring; 208. Bevel gear; 209. Drive motor; 2010. Connecting rod; 3. Base; 301. Support rod; 302. Limiting plate. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0021] Example 1:

[0022] Referring to Figures 1-4, a waste acid treatment device for pickling processes includes: a heating tank 1 for heating and concentrating the waste acid solution, with a feed valve pipe 101 and a pressure relief valve pipe 102 connected to the upper end of the heating tank 1, and a discharge valve pipe 103 connected to the bottom of the heating tank 1; a separation mechanism for removing impurities from the concentrated waste acid solution, disposed below the heating tank 1; the separation mechanism includes a separation shell 2, an intercepting filter plate 202, an annular rotating plate 204, a triangular block 205, and a roller 206, with the separation shell 2 disposed at the discharge valve. Directly below pipe 103, a discharge pipe 201 is connected to the lower end of one side of the separation shell 2. The interception filter plate 202 is slidably connected to the separation shell 2. The annular rotating plate 204 is rotatably connected to the separation shell 2 and located below the interception filter plate 202. The triangular block 205 is fixedly connected to the annular rotating plate 204 at equal intervals around the circumference. The roller 206 is rotatably connected to the lower side of the interception filter plate 202 at equal intervals around the circumference and rolls on the annular rotating plate 204. The separation shell 2 is provided with a drive unit for driving the annular rotating plate 204 to rotate.

[0023] The drive unit includes a conical gear ring 207, a bevel gear 208, and a drive motor 209. The conical gear ring 207 is fixedly connected to the bottom of the annular rotating plate 204. The bevel gear 208 is circumferentially equidistantly rotatably connected to the inner wall of the separation shell 2 and meshes with the conical gear ring 207. The drive motor 209 is fixedly connected to one side of the separation shell 2, and its output end is fixedly connected to an adjacent bevel gear 208.

[0024] When treating waste acid using the evaporation and concentration method, the waste acid solution to be treated is first injected into the heating tank 1 through the feeding valve pipe 101. The heating tank 1 can use steam, hot water or other heat sources to heat the waste acid. During the heating and evaporation process, water evaporates continuously, and the concentration of waste acid gradually increases. When the concentration reaches a certain level, the impurities in it begin to crystallize and precipitate.

[0025] After the impurities are precipitated, the discharge valve pipe 103 is opened and the drive motor 209 is started at the same time. The concentrated waste acid and crystallized impurities fall into the interception filter plate 202 in the separation shell 2 through the discharge valve pipe 103. The concentrated waste liquid can pass through the filter holes of the interception filter plate 202 and fall to the bottom of the separation shell 2, and then be discharged through the discharge pipe 201.

[0026] When the drive motor 209 is running, it drives the bevel gear 208 to rotate. The bevel gear 208 meshes with the conical gear ring 207, causing the annular rotating plate 204 to rotate, which in turn drives the triangular blocks 205 that are equidistantly distributed around the circumference to rotate. The rollers 206 that are equidistantly distributed around the circumference of the intercepting filter plate 202 roll on the annular rotating plate 204. When the rollers 206 rotate onto the triangular blocks 205, they lift the intercepting filter plate 202. After the rollers 206 leave the triangular blocks 205, the intercepting filter plate 202 falls rapidly under its own weight and the impact of the waste acid solution. The rollers 206 hit the annular rotating plate 204, causing the intercepting filter plate 202 to vibrate. The impurities on the intercepting filter plate 202 shake due to the vibration, reducing the clogging of the filter holes and ensuring that the waste acid passes through the filter holes smoothly.

[0027] If the concentration of concentrated waste acid after impurity separation meets the requirements of the pickling process, it can be directly reused in the pickling process. However, it is necessary to monitor the changes in the composition of the waste acid and replenish new acid and adjust the acid formula in a timely manner to ensure the pickling effect. For example, in steel pickling, if the concentration of hydrochloric acid in the concentrated waste acid can reach 18%-22% and the content of impurities such as iron ions is within a certain range, it can be reused to pickle steel. If it contains a high concentration of heavy metal ions, ion exchange resin needs to be used to remove the heavy metal ions so that the waste acid meets the reuse standard.

[0028] This device can effectively evaporate and concentrate the waste acid generated by the pickling process, causing impurities in the waste acid to crystallize and precipitate. The waste acid and impurities are separated by the interception filter plate 202, creating conditions for the reuse of waste acid. The mechanical structure composed of the drive motor 209, bevel gear 208, bevel gear ring 207, annular rotating plate 204, triangular block 205 and roller 206 can make the interception filter plate 202 vibrate, preventing impurities from clogging the filter holes, ensuring the continuous and stable operation of the separation process, and improving the separation efficiency.

[0029] By rationally reusing the treated waste acid, it can be reused directly if the concentration meets the standards, and reused after being treated to meet the standards if it contains heavy metal ions. This reduces the amount of new acid used, lowers production costs, reduces waste acid emissions, and alleviates environmental pressure.

[0030] Example 2:

[0031] Referring to Figures 1-4, a waste acid treatment device for pickling process is basically the same as that in Example 1, except that the intercepting filter plate 202 is a conical filter plate.

[0032] During the separation of waste acid and crystalline impurities, when the intercepting filter plate 202 vibrates under the action of the triangular block 205 and the roller 206, the conical structure makes the crystalline impurities more likely to move and accumulate towards the edge of the intercepting filter plate 202 under the action of vibration. Compared with the flat filter plate, the inclined surface of the conical filter plate can use the resultant force of gravity and vibration to guide the impurities to slide naturally towards the edge, which is convenient for centralized cleaning and reduces the frequency and difficulty of manual cleaning.

[0033] After impurities concentrate at the edge, the probability of the filter holes in the middle area of ​​the interceptor filter plate 202 being blocked by impurities decreases. More concentrated waste acid can pass smoothly through the middle filter holes and fall quickly to the bottom of the separation shell 2, which speeds up the separation speed, improves the working efficiency of the entire waste acid treatment device, and ensures the continuity of waste acid treatment.

[0034] Example 3:

[0035] Referring to Figures 1-4, a waste acid treatment device for pickling processes is basically the same as that in Example 2, but with a further improvement: an annular collection box 203 is fixedly connected to the outer edge of the intercepting filter plate 202, and rollers 206 are installed at the bottom of the annular collection box 203. When the intercepting filter plate 202 vibrates and crystalline impurities move towards the edge, the annular collection box 203 can act as a collection container to collect the impurities that have moved to the edge of the intercepting filter plate 202, thereby achieving centralized collection of impurities, facilitating subsequent unified cleaning and disposal, preventing impurities from scattering randomly in the separation shell 2, and avoiding impurities from escaping from the intercepting filter. During the up-and-down movement of plate 202, it adheres to the inner wall of separation shell 2. If impurities adhere to the inner wall of separation shell 2, it will increase the difficulty and workload of subsequent cleaning by staff. However, the annular collection box 203 can effectively block impurities and reduce their chance of contact with the inner wall of separation shell 2, making it easier to keep the inside of the equipment clean, reducing maintenance costs and maintenance time. By reducing the adhesion of impurities to the inner wall of separation shell 2, the risk of corrosion and wear of impurities to the inner wall of separation shell 2 can be reduced, extending the service life of the equipment, ensuring the integrity and stability of the internal structure of the equipment, and enabling the waste acid treatment device to operate continuously and stably.

[0036] Multiple connecting rods 2010 are fixedly connected in a circular pattern within the annular collection box 203 at equal intervals. The upper ends of the connecting rods 2010 are fixedly connected to the heating tank 1. When the drive motor 209 rotates, it drives the annular rotating plate 204 to rotate, causing the intercepting filter plate 202 to vibrate. Through the rigid connection of the connecting rods 2010, the vibration energy is directly transmitted to the heating tank 1, causing the heating tank 1 to vibrate synchronously. At this time, under the action of vibration, the concentrated waste acid and crystalline impurities can be discharged more efficiently from the discharge valve pipe 103, improving the separation efficiency and thoroughness of waste acid and impurities. During the acid solution heating treatment stage, the drive motor 209 can be started in advance to make the intercepting filter plate 202 and the annular collection box 203 vibrate. The vibration is transmitted to the heating tank 1 through the connecting rod 2010. This vibration can break the phenomenon of uneven local temperature of the waste acid solution during the heating process, promote convection and mixing inside the solution, make the waste acid solution more fully contact the heat source, effectively improve the uniformity of heating of the waste acid solution, accelerate the water evaporation rate, shorten the time required for waste acid concentration, and at the same time reduce the risk of large-scale volatilization of acid mist or decomposition of waste acid components due to local overheating.

[0037] The device also includes a base 3, with the separation shell 2 fixedly mounted on the base 3. A limiting plate 302 is fixedly connected to the top of the base 3 via a support rod 301. The heating tank 1 is vertically slidably connected to the limiting plate 302. Multiple limiting strips 104 are fixedly connected in a circumferentially equidistant manner around the outer edge of the heating tank 1. Multiple sliding grooves that cooperate with the limiting strips 104 are circumferentially equidistantly opened on the limiting plate 302. Through the arrangement of the base 3, support rod 301, and limiting plate 302, the heating tank 1 can be stabilized, ensuring the stability of the heating tank 1 during the waste acid heating and concentration process, and ensuring the safe and orderly conduct of the heating process. The cooperation between the limiting strips 104 and the sliding grooves forms a precise guiding structure. When the intercepting filter plate 202 and the heating tank 1 move up and down, this structure can limit the movement direction of the intercepting filter plate 202 and the heating tank 1, allowing them to move up and down more smoothly and ensuring the normal operation of the device.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model.

Claims

1. A device for treating waste acid from a pickling process, characterized in that, include: A heating tank (1) for heating and concentrating waste acid solution, wherein the upper end of the heating tank (1) is connected to a feed valve pipe (101) and a pressure relief valve pipe (102), and the bottom of the heating tank (1) is connected to a discharge valve pipe (103); a separation mechanism for removing impurities from the concentrated waste acid solution is located below the heating tank (1); the separation mechanism includes a separation shell (2), an intercepting filter plate (202), an annular rotating plate (204), a triangular block (205), and a roller (206), wherein the separation shell (2) is located directly below the discharge valve pipe (103), and the separation shell (2) is located below the discharge valve pipe (103). 2) A discharge pipe (201) is connected to the lower end of one side. The intercepting filter plate (202) is slidably connected to the separation shell (2) and the annular rotating plate (204) is rotatably connected to the separation shell (2) and located below the intercepting filter plate (202). The triangular block (205) is fixedly connected to the annular rotating plate (204) at equal intervals around the circumference. The roller (206) is rotatably connected to the lower side of the intercepting filter plate (202) at equal intervals around the circumference and rolls on the annular rotating plate (204). The separation shell (2) is provided with a driving part for driving the annular rotating plate (204) to rotate.

2. The pickling process waste acid treatment device according to claim 1, characterized in that, The drive unit includes a conical gear ring (207), a bevel gear (208), and a drive motor (209). The conical gear ring (207) is fixedly connected to the bottom of the annular rotating plate (204). The bevel gear (208) is circumferentially equidistantly rotatably connected to the inner wall of the separation shell (2) and meshes with the conical gear ring (207). The drive motor (209) is fixedly connected to one side of the separation shell (2), and its output end is fixedly connected to one of the adjacent bevel gears (208).

3. The pickling process waste acid treatment device according to claim 1, characterized in that, The intercepting filter plate (202) is a conical filter plate.

4. The pickling process waste acid treatment device according to claim 1, characterized in that, An annular collection box (203) is fixedly connected to the outer edge of the interception filter plate (202), and the roller (206) is installed at the bottom of the annular collection box (203).

5. The pickling process waste acid treatment device according to claim 4, characterized in that, The annular collection box (203) contains multiple connecting rods (2010) that are fixedly connected at equal intervals around the circumference, and the upper end of the connecting rods (2010) is fixedly connected to the heating tank (1).

6. The pickling process waste acid treatment device according to claim 5, characterized in that, It also includes a base (3), the separation shell (2) is fixedly installed on the base (3), and a limiting plate (302) is fixedly connected above the base (3) by a support rod (301). The heating tank (1) is vertically slidably connected to the limiting plate (302). A number of limiting strips (104) are fixedly connected in a circumferentially equidistant manner around the outer side of the heating tank (1). A number of sliding grooves that cooperate with the limiting strips (104) are opened in a circumferentially equidistant manner on the limiting plate (302).

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