Device and method for deeply purifying and rinsing powdered activated carbon

Abstract

The invention relates to a device for deeply purifying and rinsing powdered activated carbon and a purifying and rinsing method, in particular to the technical field of activated carbon production. The device for deeply purifying and rinsing the powdered activated carbon comprises a double-layer dispersing barrel, a centrifugal machine, a pulp distributing pipe, a lower discharging type filter bag, a waste liquid discharging pipe, a first liquid storage barrel, a second liquid storage barrel, a rinsing pipe and a pure water conveying pipe. Compared with a conventional purification rinsing method, the purification rinsing effect is good, impurity residues are few, and the finished product yield and the finished product purity are improved.

Description

Technical Field

[0001] The invention relates to the technical field of activated carbon production, and in particular to a device for deep purification and rinsing of powdered activated carbon and a purification and rinsing method. Background Art

[0002] Activated carbon is a multifunctional carbon material widely used in various industrial fields. Due to its excellent adsorption performance, it is widely used in many fields, including but not limited to water treatment, waste gas treatment, food industry, pharmaceutical industry, and other fields. Powdered activated carbon is a conventional product form. In terms of activated carbon material purification, especially deep purification, powdered activated carbon is much more efficient than granular activated carbon. However, due to its ultrafine powder form, it is difficult to operate during chemical purification, especially in terms of filtration. A patent proposes to use a plate and frame filter for chemical purification and rinsing. Although the rinsing improves the filtration problem, the filtration process is carried out in each plate frame, and there are dozens of plates and frames in the filtration process. The operation is troublesome and cumbersome in terms of unloading, filter cloth replacement and cleaning. In addition, the plate and frame filtration adopts pressurized filtration, which is prone to overpressure leakage. In order to solve the above problems, this patent relates to a rinsing method and device suitable for powdered activated carbon, which is simple to operate, has a high yield of finished products, and has good purification and rinsing effects. Summary of the invention

[0003] (1) Technical solution

[0004] In order to solve the above technical problems, the present invention provides a device for deep purification and rinsing of powdered activated carbon, comprising a double-layer dispersion barrel, a centrifuge, a slurry pipe, a bottom-discharge filter bag, a waste liquid discharge pipe, a first liquid storage barrel, a second liquid storage barrel, a rinsing pipe, and a pure water delivery pipe. A steam inlet valve is provided on one side of the double-layer dispersion barrel, and a steam discharge valve is provided on the other side. A discharge valve is provided at the bottom of the double-layer dispersion barrel, and the lower end of the discharge valve is connected to one end of the slurry pipe. A slurry distribution mechanism is provided at the bottom of the centrifuge, and the other end of the slurry distribution pipe is connected to the slurry distribution mechanism. The bottom of the centrifuge is provided with the bottom-discharge filter bag, and the bottom of the centrifuge is connected to a waste liquid discharge pipe and a rinsing pipe. The bottoms of the first liquid storage barrel and the second liquid storage barrel are respectively connected to the top of the rinsing pipe through pipelines, and the pure water delivery pipe is connected to the bottom of the rinsing pipe.

[0005] Preferably, a cavity for steam to pass through is provided between the outer layer and the inner layer of the double-layer dispersion barrel, and a disperser is rotatably installed in the double-layer dispersion barrel, and the disperser is driven by a dispersion motor.

[0006] Preferably, the slurry distribution pipe is provided with a delivery pump and a first control valve.

[0007] Preferably, the slurry distribution mechanism includes a spray head and a hollow conveying pipe, a trapezoidal boss protruding upward is provided in the middle of the bottom of the centrifuge, the upper end of the hollow conveying pipe passes through the trapezoidal boss and a plurality of spray heads distributed in a trapezoidal shape are provided on both sides, one end of the spray head is connected to the hollow conveying pipe, and the other end of the spray head extends out of the outer wall of the trapezoidal boss, the bottom discharge type filter bag is provided with a reserved opening corresponding to the spray head one by one, the centrifuge is coaxially mounted on the hollow conveying pipe, and the lower end of the hollow conveying pipe is connected to the other end of the slurry distribution pipe.

[0008] Preferably, a waste liquid discharge valve is provided on the waste liquid discharge pipe, a second control valve is provided on the connecting pipe between the first liquid storage tank and the rinsing pipe, a third control valve is provided on the connecting pipe between the second liquid storage tank and the rinsing pipe, a fourth control valve is provided on the rinsing pipe, and a fifth control valve is provided on the pure water delivery pipe.

[0009] Preferably, a method for deep purification and rinsing of powdered activated carbon comprises the following steps:

[0010] Step 1: Add carbon powder into the double-layer dispersion barrel, add pure water to the double-layer dispersion barrel to the limit scale, open the steam inlet valve and steam outlet valve at the same time, pass water vapor into the double-layer dispersion barrel cavity for heating, start the dispersion motor to stir and heat to the temperature of 80-90℃, continue stirring for 1-3h, close the steam inlet valve and steam outlet valve, and open the dispersion barrel interlayer drain valve;

[0011] Step 2: Quickly put the filter bag into the centrifuge;

[0012] Step 3: Start the centrifuge at a low speed. When the speed reaches 300-500rpm, open the first control valve and start the delivery pump to evenly distribute the treated slurry in the double-layer dispersion barrel on the filter bag through the slurry distribution mechanism until the thickness of the filter cake reaches 20-30cm, then stop slurry distribution; then gradually increase the speed to 1000-1500rpm to discharge the acidic waste liquid and impurities in the carbon slurry under the action of centrifugal force. The centrifugal time is 20-30min;

[0013] Step 4: Pour hydrochloric acid and pure water into the first liquid storage barrel at a mass ratio of 1:100 and prepare a hydrochloric acid solution. After the slurry is applied, close the first control valve, open the second control valve, and spray the hydrochloric acid solution on the filter cake by the slurry application mechanism through pumping, spraying while centrifuging, for 60-120 minutes; after the dynamic pickling is completed, open the fifth control valve and switch to hot pure water. The hot pure water is sprayed on the filter cake by the slurry application mechanism through pumping, spraying while centrifuging, for 60-90 minutes to remove residual acid;

[0014] Step 5: Pour one or both of caustic soda flakes and ammonium bicarbonate into the second liquid storage barrel at a mass ratio of 1:100 and prepare a neutralizing solution. After the dynamic acid discharge is completed, close the second control valve, open the third control valve, and spray the neutralizing solution on the filter cake through the pulping mechanism by pumping. Spray while centrifuging. The spraying time is 60-120 minutes. When the pH of the discharged waste liquid is detected to be pH>6, the dynamic neutralization rinsing stops;

[0015] Step 6: After neutralization and rinsing, open the fifth control valve and switch to hot pure water. The hot pure water is sprayed on the filter cake by the slurry dispensing mechanism through pumping. Spraying is performed on the activated carbon in the centrifuge filter bag during centrifugation. The hot pure water is used to spray and rinse the activated carbon in the centrifuge filter bag for 1h to 3h. When the conductivity of the discharged waste liquid is detected to be less than 20μs / cm, the dynamic alkali drainage stops.

[0016] Step 7: After the dynamic alkali drainage is completed, close all valves and delivery pumps, enter deep dehydration, and keep the centrifuge running for 0.5-1h to fully dehydrate the carbon layer filter cake;

[0017] Step 8: After dehydration, the filter bag is lifted out through the crane, and then replaced with a new one to continue the next round of purification and rinsing;

[0018] Step 9: Loosen the self-unloading buckle of the filter bag, unload the carbon filter cake into the transfer tank, and enter the drying process.

[0019] Preferably, the double-layer dispersion barrel in step one is made of corrosion-resistant material.

[0020] Preferably, the filter bag in step 2 is a bottom-discharge filter bag with a central opening, and the mesh size of the filter bag is 1000 to 3000 meshes.

[0021] (2) Beneficial effects

[0022] The present invention provides a device for deep purification and rinsing of powdered activated carbon and a purification and rinsing method. Compared with the prior art, the present invention has the following beneficial effects: not only is the operation simple, but also compared with conventional purification and rinsing methods, the purification and rinsing effect is good, less impurities remain, and the yield and purity of the finished product are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0025] The accompanying drawings are marked as: 1-double-layer dispersion barrel, 2-steam inlet valve, 3-steam exhaust valve, 4-discharge valve, 5-centrifuge, 51-slurry distribution mechanism, 511-spray head, 512-hollow delivery pipe, 6-slurry distribution pipe, 61-first control valve, 7-delivery pump, 8-filter bag, 81-spray port, 9-waste liquid discharge pipe, 91-waste liquid discharge valve, 10-first liquid storage barrel, 101-second control valve, 11-second liquid storage barrel, 111-third control valve, 12-rinsing pipe, 121-fourth control valve, 13-pure water delivery pipe, 131-fifth control valve. DETAILED DESCRIPTION

[0026] The present invention is further described in conjunction with the accompanying drawings and embodiments.

[0027] like Figure 1 As shown, a device for deep purification and rinsing of powdered activated carbon described in the present invention comprises a double-layer dispersion barrel 1, a centrifuge 5, a slurry pipe 6, a bottom-discharge filter bag 8, a waste liquid discharge pipe 9, a first liquid storage barrel 10, a second liquid storage barrel 11, a rinsing pipe 12, and a pure water delivery pipe 13. A steam inlet valve 2 is provided on one side of the double-layer dispersion barrel 1, and a steam discharge valve 3 is provided on the other side. A discharge valve 4 is provided at the bottom of the double-layer dispersion barrel 1, and the lower end of the discharge valve 4 is connected to one end of the slurry pipe 6. A slurry distribution mechanism 51 is provided at the bottom of the centrifuge 5, and the other end of the slurry distribution pipe 6 is connected to the slurry distribution mechanism 51. The centrifuge 5 is sleeved with the bottom-discharge filter bag 8. The bottom of the centrifuge 5 is connected to the waste liquid discharge pipe 9 and the rinsing pipe 12. The bottoms of the first liquid storage barrel 10 and the second liquid storage barrel 11 are respectively connected to the top of the rinsing pipe 12 through pipelines, and the pure water delivery pipe 13 is connected to the bottom of the rinsing pipe 12.

[0028] A cavity for steam to pass through is provided between the outer layer and the inner layer of the double-layer dispersion barrel 1. A disperser is rotatably installed in the double-layer dispersion barrel 1. The disperser is driven by a dispersion motor. A delivery pump 7 and a first control valve 61 are provided on the slurry distribution pipe 6.

[0029] like Figure 2As shown, the slurry distribution mechanism 51 includes a spray head 511 and a hollow conveying pipe 512. A trapezoidal boss protruding upward is provided in the middle of the bottom of the centrifuge 5. The upper end of the hollow conveying pipe 512 passes through the trapezoidal boss and a plurality of spray heads 511 arranged in a trapezoidal distribution are provided on both sides. One end of the spray head 511 is connected to the hollow conveying pipe 512, and the other end of the spray head 511 extends out of the outer wall of the trapezoidal boss. A reserved opening corresponding to the spray head 511 is provided on the bottom discharge filter bag 8. The centrifuge 5 is coaxially mounted on the hollow conveying pipe 512. The lower end of the hollow conveying pipe 512 is connected to the other end of the slurry distribution pipe 6. With such a configuration, uniform slurry distribution can be achieved through the spray head 511.

[0030] A waste liquid discharge valve 91 is provided on the waste liquid discharge pipe 9, a second control valve 101 is provided on the connecting pipe between the first liquid storage barrel 10 and the rinsing pipe 12, a third control valve 111 is provided on the connecting pipe between the second liquid storage barrel 11 and the rinsing pipe 12, a fourth control valve 121 is provided on the rinsing pipe 12, and a fifth control valve 131 is provided on the pure water delivery pipe 13.

[0031] A method for deep purification and rinsing of powdered activated carbon comprises the following steps:

[0032] Step 1: Add the carbon powder into the double-layer dispersion barrel, which is made of corrosion-resistant material. Add pure water to the double-layer dispersion barrel to the limit scale, open the steam inlet valve and the steam outlet valve at the same time, and introduce steam into the double-layer dispersion barrel cavity for heating. Start the dispersion motor to stir and heat to a temperature of 80-90°C. After stirring for 1-3 hours, close the steam inlet valve and the steam outlet valve, and open the dispersion barrel interlayer drain valve;

[0033] Step 2: Quickly put the filter bag into the centrifuge. The filter bag is a bottom-discharge filter bag with a center opening and a mesh size of 1000 to 3000. Match the reserved opening of the filter bag with the spray head one by one.

[0034] Step 3: Start the centrifuge at a low speed. When the speed reaches 300-500rpm, open the first control valve and start the delivery pump to evenly distribute the treated slurry in the double-layer dispersion barrel on the filter bag through the slurry distribution mechanism until the thickness of the filter cake reaches 20-30cm, then stop slurry distribution; then gradually increase the speed to 1000-1500rpm to discharge the acidic waste liquid and impurities in the carbon slurry under the action of centrifugal force. The centrifugal time is 20-30min;

[0035] Step 4: Pour hydrochloric acid and pure water into the first liquid storage barrel at a mass ratio of 1:100 and prepare a hydrochloric acid solution. After the slurry is applied, close the first control valve, open the second control valve, and spray the hydrochloric acid solution on the filter cake by the slurry application mechanism through pumping, spraying while centrifuging, for 60-120 minutes; after the dynamic pickling is completed, open the fifth control valve and switch to hot pure water. The hot pure water is sprayed on the filter cake by the slurry application mechanism through pumping, spraying while centrifuging, for 60-90 minutes to remove residual acid;

[0036] Step 5: Pour one or both of caustic soda flakes and ammonium bicarbonate into the second liquid storage barrel at a mass ratio of 1:100 and prepare a neutralizing solution. After the dynamic acid discharge is completed, close the second control valve, open the third control valve, and spray the neutralizing solution on the filter cake through the pulping mechanism by pumping. Spray while centrifuging. The spraying time is 60-120 minutes. When the pH of the discharged waste liquid is detected to be pH>6, the dynamic neutralization rinsing stops;

[0037] Step 6: After neutralization and rinsing, open the fifth control valve and switch to hot pure water. The hot pure water is sprayed on the filter cake by the slurry dispensing mechanism through pumping. Spraying is performed on the activated carbon in the centrifuge filter bag during centrifugation. The hot pure water is used to spray and rinse the activated carbon in the centrifuge filter bag for 1h to 3h. When the conductivity of the discharged waste liquid is detected to be less than 20μs / cm, the dynamic alkali drainage stops.

[0038] Step 7: After the dynamic alkali drainage is completed, close all valves and delivery pumps, enter deep dehydration, and keep the centrifuge running for 0.5-1h to fully dehydrate the carbon layer filter cake;

[0039] Step 8: After dehydration, the filter bag is lifted out through the crane, and then replaced with a new one to continue the next round of purification and rinsing;

[0040] Step 9: Loosen the self-unloading buckle of the filter bag, unload the carbon filter cake into the transfer tank, and enter the drying process.

[0041] The activated carbon after purification and rinsing in this scheme and the activated carbon after conventional purification and rinsing are respectively tested for impurities, and the test results are shown in Table 1:

[0042] Table 1 Data comparison of conventional purification and rinsing and purification and rinsing methods of this scheme

[0043]

[0044] The above-described embodiments only express the preferred embodiments of the present invention, and the description thereof is relatively specific and detailed, but the present invention is not limited to these embodiments. It should be noted that it is obvious to those skilled in the art. Without departing from the purpose of the present invention, any improvement made shall fall within the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A device for deep purification and rinsing of powdered activated carbon, characterized in that: The invention comprises a double-layer dispersion barrel (1), a centrifuge (5), a slurry distribution pipe (6), a bottom-discharge filter bag (8), a waste liquid discharge pipe (9), a first liquid storage barrel (10), a second liquid storage barrel (11), a rinsing pipe (12), and a pure water delivery pipe (13). A steam inlet valve (2) is provided on one side of the double-layer dispersion barrel (1), and a steam outlet valve (3) is provided on the other side. A discharge valve (4) is provided at the bottom of the double-layer dispersion barrel (1). The lower end of the discharge valve (4) is connected to one end of the slurry distribution pipe (6). A slurry distributing mechanism (51) is provided at the bottom of the centrifuge (5), the other end of the slurry distributing pipe (6) is connected to the slurry distributing mechanism (51), the bottom of the centrifuge (5) is provided with the bottom discharge type filter bag (8), the bottom of the centrifuge (5) is connected to a waste liquid discharge pipe (9) and a rinsing pipe (12), the bottoms of the first liquid storage barrel (10) and the second liquid storage barrel (11) are respectively connected to the top of the rinsing pipe (12) through pipelines, and the pure water delivery pipe (13) is connected to the bottom of the rinsing pipe (12).

2. The device for deep purification and rinsing of powdered activated carbon according to claim 1, characterized in that: A cavity for steam to pass through is provided between the outer layer and the inner layer of the double-layer dispersion barrel (1), and a disperser is rotatably installed in the double-layer dispersion barrel (1), and the disperser is driven by a dispersion motor.

3. The device for deep purification and rinsing of powdered activated carbon according to claim 1, characterized in that: The slurry distribution pipe (6) is provided with a delivery pump (7) and a first control valve (61).

4. The device for deep purification and rinsing of powdered activated carbon according to claim 1, characterized in that: The slurry distribution mechanism (51) comprises a spray head (511) and a hollow conveying pipe (512); a trapezoidal boss protruding upward is provided in the middle of the bottom of the centrifuge (5); the upper end of the hollow conveying pipe (512) passes through the trapezoidal boss and a plurality of the spray heads (511) are arranged in a trapezoidal distribution on both sides; one end of the spray head (511) is connected to the hollow conveying pipe (512); the other end of the spray head (511) extends out of the outer wall of the trapezoidal boss; a reserved opening corresponding to the spray head (511) is provided on the bottom discharge filter bag (8); the centrifuge (5) is coaxially mounted on the hollow conveying pipe (512); and the lower end of the hollow conveying pipe (512) is connected to the other end of the slurry distribution pipe (6).

5. The device for deep purification and rinsing of powdered activated carbon according to claim 1, characterized in that: The waste liquid discharge pipe (9) is provided with a waste liquid discharge valve (91), the connecting pipe between the first liquid storage tank (10) and the rinsing pipe (12) is provided with a second control valve (101), the connecting pipe between the second liquid storage tank (11) and the rinsing pipe (12) is provided with a third control valve (111), the rinsing pipe (12) is provided with a fourth control valve (121), and the pure water delivery pipe (13) is provided with a fifth control valve (131).

6. A method for deep purification and rinsing of powdered activated carbon, characterized in that: The steps include: Step 1: Add carbon powder into the double-layer dispersion barrel, add pure water to the double-layer dispersion barrel to the limit scale, open the steam inlet valve and steam outlet valve at the same time, pass water vapor into the double-layer dispersion barrel cavity for heating, start the dispersion motor to stir and heat to the temperature of 80-90℃, continue stirring for 1-3h, close the steam inlet valve and steam outlet valve, and open the dispersion barrel interlayer drain valve; Step 2: Quickly put the filter bag into the centrifuge; Step 3: Start the centrifuge at a low speed. When the speed reaches 300-500rpm, open the first control valve and start the delivery pump to evenly distribute the treated slurry in the double-layer dispersion barrel on the filter bag through the slurry distribution mechanism until the thickness of the filter cake reaches 20-30cm, then stop slurry distribution; then gradually increase the speed to 1000-1500rpm to discharge the acidic waste liquid and impurities in the carbon slurry under the action of centrifugal force. The centrifugal time is 20-30min; Step 4: Pour hydrochloric acid and pure water into the first liquid storage barrel at a mass ratio of 1:100 and prepare a hydrochloric acid solution. After the slurry is applied, close the first control valve, open the second control valve, and spray the hydrochloric acid solution on the filter cake by the slurry application mechanism through pumping, spraying while centrifuging, for 60-120 minutes; after the dynamic pickling is completed, open the fifth control valve and switch to hot pure water. The hot pure water is sprayed on the filter cake by the slurry application mechanism through pumping, spraying while centrifuging, for 60-90 minutes to remove residual acid; Step 5: Pour one or both of caustic soda flakes and ammonium bicarbonate into the second liquid storage barrel at a mass ratio of 1:100 and prepare a neutralizing solution. After the dynamic acid discharge is completed, close the second control valve, open the third control valve, and spray the neutralizing solution on the filter cake through the pulping mechanism by pumping. Spray while centrifuging. The spraying time is 60-120 minutes. When the pH of the discharged waste liquid is detected to be pH>6, the dynamic neutralization rinsing stops; Step 6: After neutralization and rinsing, open the fifth control valve and switch to hot pure water. The hot pure water is sprayed on the filter cake by the slurry dispensing mechanism through pumping. Spraying is performed on the activated carbon in the centrifuge filter bag during centrifugation. The hot pure water is used to spray and rinse the activated carbon in the centrifuge filter bag for 1h to 3h. When the conductivity of the discharged waste liquid is detected to be less than 20μs / cm, the dynamic alkali drainage stops. Step 7: After the dynamic alkali drainage is completed, close all valves and delivery pumps, enter deep dehydration, and keep the centrifuge running for 0.5-1h to fully dehydrate the carbon layer filter cake; Step 8: After dehydration, the filter bag is lifted out through the crane, and then replaced with a new one to continue the next round of purification and rinsing; Step 9: Loosen the self-unloading buckle of the filter bag, unload the carbon filter cake into the transfer tank, and enter the drying process.

7. A method for deep purification and rinsing of powdered activated carbon according to claim 6, characterized in that: The double-layer dispersion barrel in step 1 is made of corrosion-resistant material.

8. A method for deep purification and rinsing of powdered activated carbon according to claim 6, characterized in that: In step 2, the filter bag is a bottom-discharge filter bag with a central opening, and the mesh number of the filter bag is 1000 to 3000 meshes.

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