Adsorption / desorption integrated device for treating chromium-containing waste liquid

Abstract

The utility model discloses an adsorption / desorption integrated device for treating chromium-containing waste liquid, and relates to a device for treating chromium-containing waste liquid. The utility model aims to solve the technical problems that the existing device for treating the chromium-containing waste liquid is relatively complicated in structure and relatively large in occupied area. The device consists of a tank body, a motor, an upper filter plate, a lower filter plate, a spoiler, a window, a stirring rod and a stirring blade, and the chromium-containing waste liquid is treated by utilizing a targeted adsorption technology, so that the treatment cost of the traditional physicochemical technology is reduced. After adsorption, the hexavalent chromium can be enriched and concentrated through regeneration of a desorption solution, traditional landfill treatment of chromium-containing waste liquid-chromium sludge is transformed into high value of chromium-containing waste liquid-chromate product resources, and an ecological closed loop is carried out. In the whole process, the adsorption and desorption processes are carried out in an integrated device, so that the occupied area of the device is reduced.

Description

Technical Field

[0001] The utility model relates to a device for treating chromium-containing waste liquid. Background Art

[0002] Chromium and its compounds are widely used in industry. A series of industries such as metallurgy, chemical industry, mineral engineering, electroplating, chromium production, pigments, light industry and textile, chromium salt and its chromium compounds will produce a large amount of chromium-containing waste liquid, which is particularly prominent in the electroplating industry. Chromium generally exists in the form of trivalent chromium and hexavalent chromium. Trivalent chromium is relatively stable in the environment and has low toxicity to organisms. Compared with trivalent chromium, hexavalent chromium is much more toxic, about 100 times that of trivalent chromium, and is more toxic to organisms. Chromium-containing waste liquid has the dual attributes of resources and the environment. my country's external dependence on chromium resources exceeds 99%. Waste liquid is disposed of as chromium slag and landfilled, resulting in waste. There are few types of domestic fine chromium products and their quality is low. At the same time, chromium compounds have been classified as a class of carcinogens, which are easy to pollute soil and water. Hexavalent chromium is easily absorbed by the human body and causes harm. Therefore, it is urgent to treat chromium-containing waste liquid. The existing equipment for treating chromium-containing waste liquid is relatively complex in structure and occupies a large area. Utility Model Content

[0003] The utility model aims to solve the technical problems that the existing device for adsorbing chromium-containing waste liquid has a complex structure and occupies a large area, and provides an integrated adsorption / desorption device for treating chromium-containing waste liquid.

[0004] The utility model is an integrated adsorption / desorption device for treating chromium-containing waste liquid, which is composed of a tank body 1, a motor 2, an upper filter plate 3, a lower filter plate 4, a spoiler 5, a viewing window 6, a stirring rod 7 and a stirring blade 8;

[0005] Two spoilers 5 are symmetrically fixed on the inner cavity side wall of the tank body 1, and the spoilers 5 are long strips and vertically arranged along the length direction; a transparent window 6 is arranged on the side wall of the tank body 1; a motor 2 is arranged at the top center of the tank body 1, and the power output end below the motor 2 is connected to the top of the stirring rod 7, and a plurality of stirring blades 8 are evenly arranged on the stirring rod 7;

[0006] An upper filter plate 3 and a lower filter plate 4 are respectively fixed on the inner wall of the tank body 1 near the top and near the bottom, the upper filter plate 3 and the lower filter plate 4 are both arranged horizontally, all the stirring blades 8 are located between the upper filter plate 3 and the lower filter plate 4, and the two spoilers 5 are located between the upper filter plate 3 and the lower filter plate 4;

[0007] A first opening 1-1 and a second opening 1-2 are respectively arranged on the top of the tank body 1 and on both sides of the motor 2; a fourth opening 1-4 and a seventh opening 1-7 are respectively arranged on the side wall of the tank body 1 near the upper part, the fourth opening 1-4 and the seventh opening 1-7 are at the same height and are both located above the upper filter plate 3; a third opening 1-3 is arranged on the side wall of the tank body 1 near the upper part, the third opening 1-3 is below the upper filter plate 3; an eighth opening 1-8 is arranged on the side wall of the tank body 1 near the lower part, the eighth opening 1-8 is above the lower filter plate 4; a fifth opening 1-5 and a ninth opening 1-9 are arranged on the side wall of the tank body 1 near the lower part, the fifth opening 1-5 and the ninth opening 1-9 are at the same height and are both above the lower filter plate 4; a sixth opening 1-6 is arranged at the bottom center of the tank body 1; all of the above openings are connected to the inner cavity of the tank body 1, and all of the above openings are flange structures.

[0008] The flanges of the utility model can be opened and closed as required, which is a prior art.

[0009] The method of using the integrated adsorption / desorption device for treating chromium-containing waste liquid of the utility model is as follows:

[0010] 1. First, all the openings are closed, and then a solid adsorbent for hexavalent chromium is filled through the third opening 1-3 (in the present utility model, the adsorbent is an existing material, without limitation), and the third opening 1-3 is closed. The adsorbent is located between the upper filter plate 3 and the lower filter plate 4. If the adsorbent needs to be activated, the activation liquid needs to be passed into the inner cavity through the sixth opening 1-6. After the activation liquid is passed, the motor 2 is started for stirring and aeration is performed through the fifth opening 1-5 at the same time;

[0011] 2. After the activation is completed, the activation liquid is pumped out of the tank body 1 through the sixth opening 1-6 for subsequent recycling;

[0012] 3. The chromium-containing waste liquid to be treated (pH 1-2) is introduced into the inner cavity of the tank body 1 through the sixth opening 1-6. When the liquid reaches the set volume, the liquid is stopped from entering for adsorption. During the adsorption process, stirring and aeration can be started (in the same manner as step 1). Samples are taken regularly through the ninth opening 1-9 to test the concentration of hexavalent chromium in the waste liquid. The color change of the adsorbent can also be observed through the window 6 to roughly determine whether the adsorbent is saturated with adsorption.

[0013] 4. If the waste liquid does not meet the adsorption standard, but the adsorbent is saturated with adsorption, the waste liquid is discharged through the sixth opening 1-6 for collection, and then the desorption liquid is introduced through the sixth opening 1-6 for desorption. After the desorption is completed, the desorption liquid is discharged through the sixth opening 1-6, and then the untreated waste liquid is introduced into the inner cavity of the tank body 1 through the sixth opening 1-6 for adsorption until the adsorption is qualified;

[0014] 5. After the waste liquid is discharged, it is desorbed again by the desorption liquid. After the desorption is completed, the desorption liquid is discharged, and the adsorbent is removed through the eighth opening 1-8 for next use.

[0015] According to actual needs, the device can also adopt a mode of upper entry (seventh opening 1-7) and lower exit (sixth opening 1-6).

[0016] In the utility model, the upper filter plate 3 and the lower filter plate 4 are used to intercept the adsorbent and confine the adsorbent between the upper filter plate 3 and the lower filter plate 4 .

[0017] The utility model can also enter and exit the interior of the tank body 1 through the eighth opening 1-8 for repair and maintenance.

[0018] Two spoilers 5 are also provided on the inner wall of the tank body 1 of the utility model, which can block and slow down the solid adsorbent so that the solid adsorbent and the chromium-containing waste liquid will not move completely synchronously, so that the solid adsorbent and the waste liquid can move relative to each other, thereby enhancing the adsorption effect.

[0019] The integrated adsorption / desorption device for treating chromium-containing waste liquid of the utility model can also be connected in series by connecting the fourth opening 1-4 of the previous device and the sixth opening 1-6 of the next device.

[0020] In the utility model, the first opening 1-1 and the second opening 1-2 located at the top are used as pressurizing ports for sequential batch experiments or as liquid outlets for bottom-in and top-out.

[0021] The beneficial effects of the utility model are:

[0022] The utility model has a simple structure, low cost, and is easy to manufacture. It is easy to operate during use, greatly reducing labor costs. The targeted adsorption technology is used to treat chromium-containing waste liquid to reduce the cost of traditional physical and chemical technology treatment. After adsorption, the desorption liquid is regenerated, and the hexavalent chromium can be enriched and concentrated, transforming the traditional chromium-containing waste liquid-chromium sludge landfill treatment into chromium-containing waste liquid-chromate product resource high value, and completing an ecological closed loop. In the entire process, the adsorption and desorption processes are carried out in an integrated device, reducing the footprint of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an external schematic diagram of an integrated adsorption / desorption device for treating chromium-containing waste liquid according to a specific implementation mode 1;

[0024] Figure 2 It is an internal schematic diagram of an integrated adsorption / desorption device for treating chromium-containing waste liquid according to a specific implementation method 1;

[0025] Figure 3 for Figure 1 Top view of the . DETAILED DESCRIPTION

[0026] Specific implementation method 1: This implementation method is an integrated adsorption / desorption device for treating chromium-containing waste liquid, such as Figure 1-Figure 3 As shown, it is specifically composed of a tank body 1, a motor 2, an upper filter plate 3, a lower filter plate 4, a spoiler 5, a window 6, a stirring rod 7 and a stirring blade 8;

[0027] Two spoilers 5 are symmetrically fixed on the inner cavity side wall of the tank body 1, and the spoilers 5 are long strips and vertically arranged along the length direction; a transparent window 6 is arranged on the side wall of the tank body 1; a motor 2 is arranged at the top center of the tank body 1, and the power output end below the motor 2 is connected to the top of the stirring rod 7, and a plurality of stirring blades 8 are evenly arranged on the stirring rod 7;

[0028] An upper filter plate 3 and a lower filter plate 4 are respectively fixed on the inner wall of the tank body 1 near the top and near the bottom, the upper filter plate 3 and the lower filter plate 4 are both arranged horizontally, all the stirring blades 8 are located between the upper filter plate 3 and the lower filter plate 4, and the two spoilers 5 are located between the upper filter plate 3 and the lower filter plate 4;

[0029] A first opening 1-1 and a second opening 1-2 are respectively arranged on the top of the tank body 1 and on both sides of the motor 2; a fourth opening 1-4 and a seventh opening 1-7 are respectively arranged on the side wall of the tank body 1 near the upper part, the fourth opening 1-4 and the seventh opening 1-7 are at the same height and are both located above the upper filter plate 3; a third opening 1-3 is arranged on the side wall of the tank body 1 near the upper part, the third opening 1-3 is below the upper filter plate 3; an eighth opening 1-8 is arranged on the side wall of the tank body 1 near the lower part, the eighth opening 1-8 is above the lower filter plate 4; a fifth opening 1-5 and a ninth opening 1-9 are arranged on the side wall of the tank body 1 near the lower part, the fifth opening 1-5 and the ninth opening 1-9 are at the same height and are both above the lower filter plate 4; a sixth opening 1-6 is arranged at the bottom center of the tank body 1; all of the above openings are connected to the inner cavity of the tank body 1, and all of the above openings are flange structures.

[0030] The method of using the integrated adsorption / desorption device for treating chromium-containing waste liquid of the utility model is as follows:

[0031] 1. First, all the openings are closed, and then a solid adsorbent for hexavalent chromium is filled through the third opening 1-3 (in the present utility model, the adsorbent is an existing material, without limitation), and the third opening 1-3 is closed. The adsorbent is located between the upper filter plate 3 and the lower filter plate 4. If the adsorbent needs to be activated, the activation liquid needs to be passed into the inner cavity through the sixth opening 1-6. After the activation liquid is passed, the motor 2 is started for stirring and aeration is performed through the fifth opening 1-5 at the same time;

[0032] 2. After the activation is completed, the activation liquid is pumped out of the tank body 1 through the sixth opening 1-6 for subsequent recycling;

[0033] 3. The chromium-containing waste liquid to be treated (pH 1-2) is introduced into the inner cavity of the tank body 1 through the sixth opening 1-6. When the liquid reaches the set volume, the liquid is stopped from entering for adsorption. During the adsorption process, stirring and aeration can be started (in the same manner as step 1). Samples are taken regularly through the ninth opening 1-9 to test the concentration of hexavalent chromium in the waste liquid. The color change of the adsorbent can also be observed through the window 6 to roughly determine whether the adsorbent is saturated with adsorption.

[0034] 4. If the waste liquid does not meet the adsorption standard, but the adsorbent is saturated with adsorption, the waste liquid is discharged through the sixth opening 1-6 for collection, and then the desorption liquid is introduced through the sixth opening 1-6 for desorption. After the desorption is completed, the desorption liquid is discharged through the sixth opening 1-6, and then the untreated waste liquid is introduced into the inner cavity of the tank body 1 through the sixth opening 1-6 for adsorption until the adsorption is qualified;

[0035] 5. After the waste liquid is discharged, it is desorbed again by the desorption liquid. After the desorption is completed, the desorption liquid is discharged, and the adsorbent is removed through the eighth opening 1-8 for next use.

[0036] According to actual needs, the device can also adopt a mode of upper entry (seventh opening 1-7) and lower exit (sixth opening 1-6).

[0037] In this embodiment, the upper filter plate 3 and the lower filter plate 4 are used to intercept the adsorbent and confine the adsorbent between the upper filter plate 3 and the lower filter plate 4 .

[0038] In this embodiment, the interior of the tank body 1 can also be accessed through the eighth opening 1-8 for repair and maintenance.

[0039] Two spoilers 5 are also provided on the inner wall of the tank body 1 of this embodiment. The spoilers 5 can block and slow down the solid adsorbent so that the solid adsorbent and the chromium-containing waste liquid will not move completely synchronously, so that the solid adsorbent and the waste liquid can move relative to each other, thereby enhancing the adsorption effect.

[0040] The integrated adsorption / desorption device for treating chromium-containing waste liquid of this embodiment can also be connected in series by connecting the fourth opening 1-4 of the previous device and the sixth opening 1-6 of the next device.

[0041] In this embodiment, the first opening 1-1 and the second opening 1-2 located at the top are used as pressurization ports for sequential batch experiments or as liquid outlets for bottom-in and top-out.

[0042] The beneficial effects of this embodiment are:

[0043] The utility model has a simple structure, low cost, and is easy to manufacture. It is easy to operate during use, greatly reducing labor costs. The targeted adsorption technology is used to treat chromium-containing waste liquid to reduce the cost of traditional physical and chemical technology treatment. After adsorption, the desorption liquid is regenerated, and the hexavalent chromium can be enriched and concentrated, transforming the traditional chromium-containing waste liquid-chromium sludge landfill treatment into chromium-containing waste liquid-chromate product resource high value, and completing an ecological closed loop. In the entire process, the adsorption and desorption processes are carried out in an integrated device, reducing the footprint of the device.

[0044] Specific embodiment 2: This embodiment is different from the specific embodiment 1 in that the aperture of the upper filter plate 3 is 6 mm. Other aspects are the same as the specific embodiment 1.

[0045] Specific embodiment 3: This embodiment is different from specific embodiment 1 or 2 in that the aperture of the lower filter plate 4 is 6 mm. Other aspects are the same as specific embodiment 1 or 2.

[0046] Specific implementation mode 4: This implementation mode is different from the specific implementation modes 1 to 3 in that the diameter of the eighth opening 1-8 is 400 mm. The rest is the same as the specific implementation modes 1 to 3.

[0047] Specific implementation example 5: This implementation example is different from specific implementation example 4 in that the diameter of the third opening 1-3 is 300 mm. The rest is the same as specific implementation example 4.

[0048] Specific embodiment 6: This embodiment is different from the specific embodiment 5 in that the horizontal width of the spoiler 5 is 10 cm and the thickness is 5 cm. The rest is the same as the specific embodiment 5.

[0049] The utility model is verified by the following tests:

[0050] Test 1: An adsorption test was conducted using the device of Specific Implementation Method 6. The water quality of the chromium-containing waste liquid to be treated and the waste liquid after acidification is shown in Table 1.

[0051] Table 1

[0052]

[0053] Adsorption / desorption was performed using the method of the first specific implementation method. The data after completion are shown in Table 2. The removal rate of hexavalent chromium in the chromium-containing waste liquid reached 89.64%. After the desorption is completed, our entire process: activation-adsorption-desorption is completed. As the number of adsorption and desorption increases, the desorption liquid will eventually reach saturation, and chromate can be prepared by recrystallization, and chromic anhydride can be obtained by further reaction.

[0054] Table 2

[0055]

Claims

1. An integrated adsorption / desorption device for treating chromium-containing waste liquid, characterized in that The integrated adsorption / desorption device for treating chromium-containing waste liquid is composed of a tank body (1), a motor (2), an upper filter plate (3), a lower filter plate (4), a spoiler (5), a viewing window (6), a stirring rod (7) and a stirring blade (8); Two spoilers (5) are symmetrically fixed on the inner cavity side wall of the tank body (1), and the spoilers (5) are long strips and vertically arranged along the length direction; a transparent window (6) is arranged on the side wall of the tank body (1); a motor (2) is arranged at the top center of the tank body (1), and the power output end below the motor (2) is connected to the top of a stirring rod (7), and a plurality of stirring blades (8) are evenly arranged on the stirring rod (7); An upper filter plate (3) and a lower filter plate (4) are respectively fixed on the inner wall of the tank body (1) near the top and near the bottom, the upper filter plate (3) and the lower filter plate (4) are both arranged horizontally, all the stirring blades (8) are located between the upper filter plate (3) and the lower filter plate (4), and the two spoiler plates (5) are located between the upper filter plate (3) and the lower filter plate (4); A first opening (1-1) and a second opening (1-2) are respectively arranged at the top of the tank body (1) and on both sides of the motor (2); a fourth opening (1-4) and a seventh opening (1-7) are respectively arranged near the upper portion of the side wall of the tank body (1); the fourth opening (1-4) and the seventh opening (1-7) are at the same height and are both located above the upper filter plate (3); a third opening (1-3) is arranged near the upper portion of the side wall of the tank body (1); the third opening (1-3) is located below the upper filter plate (3); An eighth opening (1-8) is arranged near the lower part of the side wall of the tank body (1), and the eighth opening (1-8) is above the lower filter plate (4); a fifth opening (1-5) and a ninth opening (1-9) are arranged near the lower part of the side wall of the tank body (1), and the fifth opening (1-5) and the ninth opening (1-9) are at the same height and are above the lower filter plate (4); a sixth opening (1-6) is arranged at the center of the bottom of the tank body (1); all of the above openings are connected to the inner cavity of the tank body (1), and all of the above openings are flange structures.

2. The integrated adsorption / desorption device for treating chromium-containing waste liquid according to claim 1, characterized in that The aperture of the upper filter plate (3) is 6 mm.

3. The integrated adsorption / desorption device for treating chromium-containing waste liquid according to claim 1, characterized in that The aperture of the lower filter plate (4) is 6 mm.

4. The integrated adsorption / desorption device for treating chromium-containing waste liquid according to claim 1, characterized in that The aperture of the eighth opening (1-8) is 400 mm.

5. The integrated adsorption / desorption device for treating chromium-containing waste liquid according to claim 1, characterized in that The aperture of the third opening (1-3) is 300 mm.

6. The integrated adsorption / desorption device for treating chromium-containing waste liquid according to claim 1, characterized in that The spoiler (5) has a horizontal width of 10 cm and a thickness of 5 cm.

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