A device and method for purifying and rinsing a powdered activated carbon

Abstract

The present application relates to a kind of powder active carbon deep purification rinsing device and purification rinsing method, especially to active carbon production technical field.The powder active carbon deep purification rinsing device in the present application includes double-layer dispersion barrel, centrifuge, cloth pulp pipe, under discharge material type filter bag, waste liquid discharge pipe, first liquid storage barrel, second liquid storage barrel, rinsing pipe, pure water delivery pipe, through the powder active carbon deep purification rinsing method proposed in the present application, the method is not only simple operation, compared with conventional purification rinsing method, purification rinsing effect is good, impurity residue is less, improves the yield of finished product and the purity of finished product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of activated carbon production, in particular to a device and method for deep purification and rinsing of powdery activated carbon. BACKGROUND

[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. Powdery activated carbon is a conventional product form. In the purification of activated carbon materials, especially deep purification, the purification efficiency of powdery activated carbon is much higher than that of granular activated carbon. However, due to its ultra-fine powdery form, the operation is difficult during chemical purification, especially in the aspect of filtration. Some patents propose using plate and frame filter to perform chemical purification and rinsing. Although the filtration problem is improved during rinsing, the filtration process is carried out in each plate and frame. During the filtration process, dozens of plate and frame are operated, which is troublesome and complicated in terms of unloading, filter cloth replacement and cleaning. In addition, plate and frame filtration adopts pressure filtration, which is prone to overpressure leakage. In order to solve the above problems, the present application relates to a rinsing method and device suitable for powdery activated carbon, which is simple to operate, has high product yield and good purification and rinsing effect. SUMMARY

[0003] (1) Technical solution

[0004] In order to solve the above technical problems, the present application provides a device for deep purification and rinsing of powdery activated carbon, which comprises a double-layer dispersion barrel, a centrifuge, a cloth pulp pipe, a lower discharge type filter bag, a waste liquid discharge pipe, a first liquid storage barrel, a second liquid storage barrel, a rinsing pipe and a pure water conveying pipe. One side of the double-layer dispersion barrel is provided with a steam inlet valve, and the other side is provided with a steam outlet valve. The bottom of the double-layer dispersion barrel is provided with a discharge valve. The lower end of the discharge valve is connected with one end of the cloth pulp pipe. The bottom of the centrifuge is provided with a cloth pulp mechanism. The other end of the cloth pulp pipe is connected with the cloth pulp mechanism. The centrifuge is sleeved with the lower discharge type filter bag. The bottom of the centrifuge is connected with the waste liquid discharge pipe and the rinsing pipe. The first liquid storage barrel and the second liquid storage barrel are connected with the top of the rinsing pipe through pipes respectively. The pure water conveying pipe is connected with the bottom of the rinsing pipe.

[0005] Preferably, a cavity for steam inlet is arranged between the outer layer and the inner layer of the double-layer dispersion barrel. A disperser is rotatably installed in the double-layer dispersion barrel, and the disperser is driven by a dispersing motor.

[0006] Preferably, a conveying pump and a first control valve are arranged on the cloth pulp pipe.

[0007] Preferably, the pulp distribution mechanism comprises a spray head and a hollow delivery pipe, a trapezoidal boss is arranged in the middle of the bottom of the centrifuge, the upper end of the hollow delivery pipe penetrates through the trapezoidal boss and is provided with a plurality of spray heads arranged in a trapezoidal manner on both sides, one end of the spray head is in communication with the hollow delivery pipe, and the other end of the spray head extends out of the outer wall of the trapezoidal boss, the underflow type filter bag is provided with a reserved port corresponding to the spray head, the centrifuge is coaxially sleeved on the hollow delivery pipe, and the lower end of the hollow delivery pipe is connected with the other end of the pulp distribution pipe.

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

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

[0010] Step one: add carbon powder into the double-layer dispersion barrel, add pure water into the double-layer dispersion barrel to the limiting scale, open the steam inlet valve and the steam outlet valve, and pass water vapor into the cavity of the double-layer dispersion barrel for heating, start the dispersion motor for stirring and heating to a temperature of 80-90 DEG C, continuously stir for 1-3 h, then close the steam inlet valve and the steam outlet valve, and open the interlayer drainage valve of the dispersion barrel;

[0011] Step two: quickly put in the filter bag and put into the centrifuge;

[0012] Step three: start the centrifuge to run at a low speed, open the first control valve when the rotating speed is 300-500 rpm, start the delivery pump to uniformly distribute the treated slurry in the double-layer dispersion barrel on the filter bag through the pulp distribution mechanism until the thickness of the filter cake reaches 20-30 cm, and stop the pulp distribution; then gradually increase the rotating speed to 1000-1500 rpm, so that the acidic waste liquid and impurities in the carbon slurry are discharged under the action of centrifugal force, and the centrifugal time is 20-30 min;

[0013] Step four: pour hydrochloric acid and pure water into the first liquid storage barrel according to a mass ratio of 1:100 to prepare a hydrochloric acid solution, close the first control valve after the pulp distribution is completed, open the second control valve, spray the hydrochloric acid solution on the filter cake through the pulp distribution mechanism by pumping, spray while centrifuging, and the time is 60-120 min; after the dynamic acid pickling is completed, open the fifth control valve, switch to hot pure water, spray the hot pure water on the filter cake through the pulp distribution mechanism by pumping, spray while centrifuging, and the time is 60-90 min to remove residual acid;

[0014] Step five: one or both of the piece of alkali and ammonium bicarbonate are poured into the second liquid storage barrel at a mass ratio of 1:100 to prepare a neutralizing liquid, after the dynamic acid discharge is completed, the second control valve is closed, the third control valve is opened, the neutralizing liquid is sprayed on the filter cake by the way of pumping through the cloth pulp mechanism, the spraying is performed while centrifugation, the spraying time is 60-120 min, when the pH of the discharged waste liquid is detected to be greater than 6, the dynamic neutralization and rinsing is stopped;

[0015] Step six: after the neutralization and rinsing is completed, the fifth control valve is opened, the hot pure water is switched to, the hot pure water is sprayed on the filter cake by the way of pumping through the cloth pulp mechanism, the spraying is performed while centrifugation, the activated carbon in the centrifuge filter bag is rinsed by spraying for 1h-3h, when the conductivity of the discharged waste liquid is detected to be less than 20 μs / cm, the dynamic alkali discharge is stopped;

[0016] Step seven: after the dynamic alkali discharge is completed, all the valves and delivery pumps are closed, the deep dehydration is entered, the centrifuge is kept running for 0.5-1h, so that the carbon layer filter cake is fully dehydrated;

[0017] Step eight: after the dehydration is completed, the filter bag is taken out as a whole through the travelling crane, a new filter bag is replaced, and the next round of purification and rinsing is continued;

[0018] Step nine: the self-unloading buckle of the filter bag is loosened, the carbon filter cake is unloaded into the transfer tank, and the drying process is entered.

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

[0020] Preferably, the filter bag in step two is a center-opening under-discharge type filter bag, and the filter bag mesh number is 1000-3000 meshes.

[0021] (2) Beneficial effects

[0022] The present application provides a device and a method for deep purification and rinsing of powdery activated carbon, compared with the prior art, the present application has the following beneficial effects: not only simple operation, compared with the conventional purification and rinsing method, the purification and rinsing effect is good, the impurity residue is less, and the yield and purity of the finished product are improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The figure is a structural schematic diagram of the present application.

[0024] Figure 2 The figure is Figure 1 The enlarged view of position A in the figure.

[0025] The figure marks are: 1-double layer dispersion barrel, 2-steam inlet valve, 3-steam outlet valve, 4-discharge valve, 5-centrifuge, 51-pulp distribution mechanism, 511-spraying head, 512-hollow conveying pipe, 6-pulp distribution pipe, 61-first control valve, 7-conveying pump, 8-filter bag, 81-spraying opening, 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-rinse pipe, 121-fourth control valve, 13-pure water conveying pipe, 131-fifth control valve. DETAILED DESCRIPTION

[0026] The application is further illustrated in combination with the drawings and examples.

[0027] As Figure 1 shown, the device for deep purification and rinsing of powdered activated carbon comprises a double layer dispersion barrel 1, a centrifuge 5, a pulp distribution pipe 6, a discharge type filter bag 8, a waste liquid discharge pipe 9, a first liquid storage barrel 10, a second liquid storage barrel 11, a rinse pipe 12, and a pure water conveying pipe 13. The double layer dispersion barrel 1 is provided with a steam inlet valve 2 on one side and a steam outlet valve 3 on the other side. The bottom of the double layer dispersion barrel 1 is provided with a discharge valve 4, the lower end of which is connected with one end of the pulp distribution pipe 6. The bottom of the centrifuge 5 is provided with a pulp distribution mechanism 51, and the other end of the pulp distribution pipe 6 is connected with the pulp distribution mechanism 51. The centrifuge 5 is sleeved with the discharge type filter bag 8. The bottom of the centrifuge 5 is connected with the waste liquid discharge pipe 9 and the rinse pipe 12. The first liquid storage barrel 10 and the second liquid storage barrel 11 are respectively connected with the top of the rinse pipe 12 through pipes. The pure water conveying pipe 13 is connected with the bottom of the rinse pipe 12.

[0028] The double layer dispersion barrel 1 is provided with a cavity for steam inlet between the outer layer and the inner layer. A disperser is rotatably installed in the double layer dispersion barrel 1, which is driven by a dispersing motor. The pulp distribution pipe 6 is provided with a conveying pump 7 and a first control valve 61.

[0029] As Figure 2As shown, the cloth pulp mechanism 51 includes a spray head 511 and a hollow conveying pipe 512, and a trapezoidal boss is arranged upward in the middle of the bottom of the centrifuge 5. The upper end of the hollow conveying pipe 512 penetrates through the trapezoidal boss, and a plurality of spray heads 511 are arranged on both sides of the hollow conveying pipe 512 in a trapezoidal distribution. One end of the spray head 511 is in communication with the hollow conveying pipe 512, and the other end of the spray head 511 extends out of the outer wall of the trapezoidal boss. The lower discharge type filter bag 8 is provided with a reserved port corresponding to the spray head 511. The centrifuge 5 is coaxially sleeved on the hollow conveying pipe 512, and the lower end of the hollow conveying pipe 512 is connected to the other end of the cloth pulp pipe 6. In this way, uniform cloth pulp can be realized through the spray head 511.

[0030] The waste liquid discharge pipe 9 is provided with a waste liquid discharge valve 91. The connecting pipe between the first liquid storage barrel 10 and the rinsing pipe 12 is provided with a second control valve 101. The connecting pipe between the second liquid storage barrel 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. The pure water conveying pipe 13 is provided with a fifth control valve 131.

[0031] A powder activated carbon deep purification rinsing method, comprising the following steps:

[0032] Step one: add carbon powder into a double-layer dispersion barrel made of corrosion-resistant material, add pure water into the double-layer dispersion barrel to the limit scale, open the steam inlet valve and the steam discharge valve, and introduce water vapor into the cavity of the double-layer dispersion barrel for heating. Start the dispersion motor to stir and heat to a temperature of 80-90℃. After continuous stirring for 1-3h, close the steam inlet valve and the steam discharge valve, and open the dispersion barrel interlayer drain valve.

[0033] Step two: quickly put the filter bag into the centrifuge. The filter bag is a lower discharge type filter bag with a central opening, and the mesh number of the filter bag is 1000-3000 meshes. The reserved port of the filter bag corresponds to the spray head one by one.

[0034] Step three: start the centrifuge at a low speed, open the first control valve, and start the conveying pump to uniformly distribute the treated slurry in the double-layer dispersion barrel on the filter bag through the cloth pulp mechanism until the thickness of the filter cake reaches 20-30cm, and stop the cloth pulp distribution. Gradually increase the speed to 1000-1500rpm to make the acidic waste liquid and impurities in the carbon slurry discharged under the action of centrifugal force, and the centrifugal time is 20-30min.

[0035] Step four: The hydrochloric acid and pure water are poured into the first liquid storage tank at a mass ratio of 1:100 to prepare a hydrochloric acid solution. After the padding is completed, the first control valve is closed, and the second control valve is opened. The hydrochloric acid solution is sprayed on the filter cake by the padding mechanism through pumping, and the spraying is performed while centrifuging, with a time of 60-120 min. After dynamic acid washing is completed, the fifth control valve is opened, and hot pure water is switched to. The hot pure water is sprayed on the filter cake by the padding mechanism through pumping, and the spraying is performed while centrifuging, with a time of 60-90 min, and residual acid is removed.

[0036] Step five: One or both of the tablet alkali and ammonium bicarbonate are poured into the second liquid storage tank at a mass ratio of 1:100 to prepare a neutralizing liquid. After dynamic acid removal is completed, the second control valve is closed, and the third control valve is opened. The neutralizing liquid is sprayed on the filter cake by the padding mechanism through pumping, and the spraying is performed while centrifuging, with a spraying time of 60-120 min. When the pH of the discharged waste liquid is detected to be greater than 6, dynamic neutralization rinsing is stopped.

[0037] Step six: After neutralization rinsing is completed, the fifth control valve is opened, and hot pure water is switched to. The hot pure water is sprayed on the filter cake by the padding mechanism through pumping, and the spraying is performed while centrifuging. The activated carbon in the centrifuge filter bag is rinsed by spraying for 1h-3h. When the conductivity of the discharged waste liquid is detected to be less than 20μs / cm, dynamic alkali removal is stopped.

[0038] Step seven: After dynamic alkali removal is completed, all valves and delivery pumps are closed, and deep dewatering is entered. The centrifuge is kept running for 0.5-1h to sufficiently dewater the carbon layer filter cake.

[0039] Step eight: After dewatering is completed, the filter bag is removed as a whole by the travelling crane, and a new filter bag is replaced to continue the next round of purification rinsing.

[0040] Step nine: The self-unloading buckle of the filter bag is loosened, and the carbon filter cake is unloaded into the transfer tank to enter the drying process.

[0041] The activated carbon purified by the present scheme and the activated carbon purified by the conventional purification rinsing method are now detected for impurities, and the detection results are shown in Table 1:

[0042] Table 1: Comparison of data of the conventional purification rinsing method and the present purification rinsing method

[0043] Example Iron salt / ppm Chloride / ppm Potassium / ppm Sodium / ppm Calcium / ppm Magnesium / ppm Aluminium / ppm Silicon / ppm Comparative Example 101 112 80 120 98 58 67 23 Example 8 10 9 10 10 8 2 0.1

[0044] The above-described embodiments only express the preferred embodiments of the present application, which are described in a more specific and detailed manner, but the present application is not limited to these embodiments. It should be pointed out that any improvement made by those skilled in the art without departing from the spirit of the present application falls within the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. An apparatus for powdered activated carbon polishing, characterized by, The utility model provides a double -deck dispersion bucket, centrifuge, cloth pulp pipe, under the filter bag of discharging material type, waste liquid discharge pipe, first liquid storage bucket, second liquid storage bucket, rinsing pipe, pure water conveying pipe, the cavity for steam to enter is equipped between the outer layer and the inner layer of the double -deck dispersion bucket, rotates and is installed with the disperser in the double -deck dispersion bucket, the disperser is driven through dispersion motor, one side of the double -deck dispersion bucket is equipped with steam inlet valve (2), the other side is equipped with steam exhaust valve (3), the bottom of the double -deck dispersion bucket is equipped with discharge valve (4), the lower extreme of discharge valve (4) is connected with one end of cloth pulp pipe (6), the bottom of centrifuge (5) is equipped with cloth pulp mechanism (51), the other end of cloth pulp pipe (6) is connected with cloth pulp mechanism (51), is equipped with conveying pump (7) and first control valve (61) on cloth pulp pipe (6), cloth pulp mechanism (51) includes spray head (511) and hollow conveying pipe (512), the bottom intermediate of centrifuge (5) is equipped with the upwardly protruding trapezoidal boss, the upper end of hollow conveying pipe (512) passes through the trapezoidal boss and both sides are equipped with a plurality of spray head (511) and are arranged in trapezoidal distribution, one end of spray head (511) is communicated with hollow conveying pipe (512), the other end of spray head (511) extends the outer wall of trapezoidal boss, under the filter bag of discharging material type (8) is equipped with the pre -reserved mouth with spray head (511) one -to -one correspondence, centrifuge (5) is coaxially sleeved on hollow conveying pipe (512), the lower extreme of hollow conveying pipe (512) is connected with the other end of cloth pulp pipe (6), the inside of centrifuge (5) is equipped with under the filter bag of discharging material type (8), the bottom of centrifuge (5) is connected with waste liquid discharge pipe (9) and rinsing pipe (12), the bottom of first liquid storage bucket (10) and second liquid storage bucket (11) is connected with the top of rinsing pipe (12) respectively through pipeline, pure water conveying pipe (13) is connected with the bottom of rinsing pipe (12), is equipped with waste liquid discharge valve (91) on waste liquid discharge pipe (9), is equipped with second control valve (101) on the connecting pipeline of first liquid storage bucket (10) and rinsing pipe (12), is equipped with third control valve (111) on the connecting pipeline of second liquid storage bucket (11) and rinsing pipe (12), is equipped with fourth control valve (121) on rinsing pipe (12), is equipped with fifth control valve (131) on pure water conveying pipe (13).

2. A powdered activated carbon polishing rinse process characterized by, It comprises the following steps: Step one: carbon powder is added to the double -deck dispersion bucket, pure water is added to the double -deck dispersion bucket to the limit mark, steam inlet valve and steam exhaust valve are opened, steam is introduced into the double -deck dispersion bucket cavity and heated, dispersion motor is started to stir, heating temperature is 80-90 DEG C, and stirring is continued for 1-3h, steam inlet valve and steam exhaust valve are closed, and dispersion bucket interlayer drain valve is opened; Step two: quickly sleeve into the filter bag and install into the centrifuge; Step three: start the centrifuge at low speed, when the speed is 300-500 rpm, open the first control valve, start the delivery pump to evenly distribute the treated slurry in the double-layer dispersion barrel on the filter bag through the cloth distribution mechanism until the thickness of the filter cake reaches 20-30 cm, stop cloth distribution; then gradually increase the speed to 1000-1500 rpm, so that the acidic waste liquid and impurities in the carbon slurry are discharged under the action of centrifugal force, and the centrifugation time is 20-30 min; Step four: prepare a hydrochloric acid solution by pouring hydrochloric acid and pure water into the first liquid storage tank at a mass ratio of 1:

100. After cloth distribution is completed, close the first control valve and open the second control valve. The hydrochloric acid solution is sprayed on the filter cake by the cloth distribution mechanism through pumping. The spraying is performed simultaneously with centrifugation, and the time is 60-120 min. After dynamic acid washing is completed, open the fifth control valve to switch to hot pure water. The hot pure water is sprayed on the filter cake by the cloth distribution mechanism through pumping. The spraying is performed simultaneously with centrifugation, and the time is 60-90 min to remove residual acid; Step five: prepare a neutralizing liquid by pouring one or both of flake soda and ammonium bicarbonate into the second liquid storage tank at a mass ratio of 1:

100. After dynamic acid removal is completed, close the second control valve and open the third control valve. The neutralizing liquid is sprayed on the filter cake by the cloth distribution mechanism through pumping. The spraying is performed simultaneously with centrifugation, and the spraying time is 60-120 min. When the pH of the discharged waste liquid is detected to be greater than 6, dynamic neutralization and rinsing are stopped; Step six: after neutralization and rinsing are completed, open the fifth control valve to switch to hot pure water. The hot pure water is sprayed on the filter cake by the cloth distribution mechanism through pumping. The spraying is performed simultaneously with centrifugation, and the filter cake is rinsed with hot pure water for 1-3 h. When the conductivity of the discharged waste liquid is detected to be less than 20 μs / cm, dynamic alkali removal is stopped; Step seven: after dynamic alkali removal is completed, close all valves and the delivery pump, and enter the deep dehydration stage. Keep the centrifuge running for 0.5-1 h to fully dehydrate the carbon layer filter cake; Step eight: after dehydration is completed, remove the filter bag as a whole through the overhead crane, replace it with a new filter bag, and continue the next round of purification and rinsing; Step nine: loosen the self-unloading buckle of the filter bag, and unload the carbon filter cake into the transfer tank for drying.

3. The powdered activated carbon polishing rinse method of claim 2, wherein, The double-layer dispersion barrel in step one is made of corrosion-resistant material.

4. The powdered activated carbon polishing rinse method of claim 2, wherein, The filter bag in step two is a center-opening under-discharge filter bag with a mesh size of 1000-3000 meshes.

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