Activated carbon treatment process and equipment

Abstract

The invention discloses an activated carbon treatment process and equipment, which relates to the technical field of activated carbon production, and mainly comprises a pickling tank, a first neutralization tank, a second neutralization tank, a first waste brine tank, a filter press, a flocculant tank, a second waste brine tank, a reclaimed water tank and a recycled water tank; steam is introduced into the pickling tank to make the temperature in the pickling tank reach 95°C, and the activated carbon adsorbs sulfuric acid solution to saturation; steam is introduced to make the temperature in the pickling tank reach 115-120°C, and maintained for three hours; the pickling tank is vented and depressurized to normal pressure; hot water with a temperature of not less than 85°C is added to the pickling tank to submerge the activated carbon and stir, and the water in the pickling tank is discharged after half an hour; until the pH value of the water discharged from the pickling tank is greater than 6. The temperature in the pickling tank is increased by steam, so that the ash in the activated carbon is more easily dissolved by the sulfuric acid solution, thereby better removing the ash in the activated carbon, and then the acid water is made to meet the discharge standard through neutralization, precipitation, filter pressing and flocculation to avoid pollution to the environment.

Description

Technical Field

[0001] The invention relates to the technical field of activated carbon production, and in particular to an activated carbon treatment process and equipment. Background Art

[0002] Due to its excellent adsorption properties, activated carbon is widely used in various industries such as energy, chemical industry, food, medicine, environmental protection, materials, metallurgy, etc., and has become an important industrial product in production and life.

[0003] Based on the raw materials used to produce activated carbon, it can be roughly divided into two categories: coal-based activated carbon and wood-based activated carbon. Wood-based activated carbon can also be divided into two categories: one is granular activated carbon represented by coconut shells, rubber shells, walnut shells and other fruit shells, and the other is powdered activated carbon represented by sawdust, rice husks, bamboo chips and the like.

[0004] The current granular activated carbon pickling device includes a cylinder with a liquid outlet at the bottom, and a filter plate with filter holes is arranged on the bottom of the cylinder. During pickling, materials (activated carbon, hydrochloric acid, etc.) are added into the cylinder for reaction, and the pickling liquid is discharged through the outlet after the reaction.

[0005] The existing activated carbon pickling device has low efficiency and the cleaning effect is not ideal. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides an activated carbon treatment process and equipment, which can better remove the ash in the activated carbon and effectively treat the wastewater generated in the pickling process to avoid pollution to the environment.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] The present invention provides an activated carbon treatment process, characterized in that it comprises the following steps:

[0009] The first step is to place the activated carbon into a pickling tank and add an acid solution into the pickling tank;

[0010] The second step is to introduce steam into the pickling tank to raise the temperature in the pickling tank to 90-100℃ and maintain it for one hour. During this process, the activated carbon adsorbs the sulfuric acid solution to a saturated state and then releases the acid solution.

[0011] The third step is to continue to introduce steam to raise the temperature in the pickling tank to 115-120°C and maintain it for three hours;

[0012] The fourth step is to stop the steam supply to the pickling tank and to vent the pickling tank to normal pressure;

[0013] Step 5: Add hot water with a temperature of not less than 85°C to the pickling tank until the activated carbon is submerged, stir the activated carbon and hot water in the pickling tank, and drain the water in the pickling tank after half an hour;

[0014] Step 6: Repeat step 5 several times until the pH value of the water discharged from the pickling tank is greater than 6, completing the pickling process.

[0015] Optionally, in the first step, the acidic solution is a sulfuric acid solution with a volume concentration of 10-20%.

[0016] Optionally, in the third step, the pickling tank is drained regularly to make the water level in the pickling tank lower than the steam outlet.

[0017] Optionally, when the pH value of the water discharged from the pickling tank is less than 2, the water discharged from the pickling tank needs to be neutralized, precipitated, filtered, and then a flocculant is added before being discharged.

[0018] Optionally, when the pH value of the water discharged from the pickling tank is greater than 2, the water discharged from the pickling tank is neutralized and precipitated and then used as hot water for the first few cleanings in the pickling tank.

[0019] An activated carbon treatment device comprises a plurality of pickling tanks arranged in parallel; a first neutralization tank and a second neutralization tank connected to the pickling tank, the first neutralization tank and the second neutralization tank being arranged in parallel; a first waste brine tank connected to the first neutralization tank; a filter press connected to the first waste brine tank; a flocculant tank connected to the filter press; a discharge pipe connected to the flocculant tank; a sedimentation tank connected to the discharge pipe; a second waste brine tank connected to the second neutralization tank; a reclaimed water tank connected to the reclaimed water tank, the reclaimed water tank being connected to the pickling tank.

[0020] Optionally, a stirring device is provided in the pickling tank.

[0021] Optionally, a heat-insulating layer is provided outside the pickling tank.

[0022] Optionally, a steam inlet is provided on the pickling tank.

[0023] Compared with the prior art, the present invention has achieved the following technical effects:

[0024] The activated carbon treatment process and equipment of the present invention utilize steam to increase the temperature in the pickling tank, so that the ash in the activated carbon is more easily dissolved by the sulfuric acid solution, thereby better removing the ash in the activated carbon, and then through neutralization, precipitation, filter pressing and flocculation, the acid water meets the discharge standard to avoid pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic structural diagram of the activated carbon treatment equipment of the present invention.

[0027] Explanation of the accompanying drawings: 1. Pickling tank; 2. First neutralization tank; 3. First waste brine tank; 4. Filter press; 5. Flocculant tank; 6. Recycled water tank; 7. Recycled water tank; 8. Second waste brine tank; 9. Second neutralization tank. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1:

[0030] like Figure 1 As shown, this embodiment provides an activated carbon treatment process, comprising the following steps:

[0031] The first step is to put the activated carbon into the pickling tank 1 and add the acid solution into the pickling tank 1; add 6m 3 Activated carbon, 4.2m 3 The acidic solution is a sulfuric acid solution with a volume concentration of 15%;

[0032] In the second step, steam is introduced into the pickling tank 1 to raise the temperature in the pickling tank 1 to 95° C. and maintained for one hour. During this process, the activated carbon adsorbs the sulfuric acid solution to a saturated state; then the acid solution is released;

[0033] The third step is to continue to introduce steam to raise the temperature in the pickling tank 1 to 115-120°C and maintain it for three hours; during the process of introducing steam, the pickling tank 1 is drained every half an hour to make the water level in the pickling tank 1 lower than the steam outlet;

[0034] Step 4: stop introducing steam into the pickling tank 1, and exhaust and release the pressure of the pickling tank 1 to normal pressure;

[0035] Step 5: Add hot water of not less than 85°C to the pickling tank 1 until the activated carbon is submerged for about 4 minutes. 3water, stirring the activated carbon and hot water in the pickling tank 1, and draining the water in the pickling tank 1 after half an hour;

[0036] Step 6: Repeat step 5 several times until the pH value of the water discharged from the pickling tank 1 is greater than 6, completing the pickling process; finally, the iron content in the activated carbon decreases from 6000 ppm to no more than 150 ppm;

[0037] When the pH value of the water discharged from the pickling tank 1 is less than 2, the water discharged from the pickling tank 1 needs to be neutralized, precipitated, filtered, and then a flocculant is added before being discharged.

[0038] When the pH value of the water discharged from the pickling tank 1 is greater than 2, the water discharged from the pickling tank 1 is neutralized and precipitated and then used as the rinsing hot water for the first several times in other pickling tanks 1.

[0039] Embodiment 2:

[0040] This embodiment discloses a device based on the activated carbon treatment in embodiment 1, such as Figure 1 As shown, the activated carbon treatment equipment includes four pickling tanks 1 arranged in parallel; a stirring device is arranged in the pickling tank 1; an insulation layer is arranged outside the pickling tank 1; and a steam inlet is arranged on the pickling tank 1. A first neutralization tank 2 and a second neutralization tank 9 connected to the pickling tank 1, the first neutralization tank 2 and the second neutralization tank 9 are arranged in parallel; a first waste brine tank connected to the first neutralization tank 2; a filter press 4 connected to the first waste brine tank; a flocculant tank 5 connected to the filter press 4; the flocculant tank 5 is connected to a discharge pipe; a sedimentation tank is connected to the discharge pipe; a second waste brine tank connected to the second neutralization tank 9; a reclaimed water tank 7 connected to the second waste brine tank; a recycled water tank 6 connected to the reclaimed water tank 7, the recycled water tank 6 is connected to the pickling tank 1.

[0041] Add activated carbon and sulfuric acid solution with a volume concentration of 15% to the pickling tank 1, introduce steam to raise the temperature in the pickling tank 1 to 95°C, maintain for one hour so that the activated carbon can fully absorb the sulfuric acid solution, and then release the acid; continue to introduce steam to raise the temperature in the pickling tank 1 to 115-120°C, and maintain for three hours. During this period, pay attention to the regular discharge of condensed water in the pickling tank 1 to avoid excessive water level affecting the entry of steam; then stop introducing steam and depressurize the pickling tank 1 to normal pressure; add washing hot water with a temperature of not less than 85°C to the pickling tank 1 to submerge the activated carbon, stir the activated carbon and hot water in the pickling tank 1, and discharge the water in the pickling tank 1 after half an hour; after repeated multiple times, the pH value of the water discharged from the pickling tank 1 is greater than 6, and the pickling process is completed; finally, the iron content in the activated carbon decreases from 6000ppm to no more than 150ppm;

[0042] When the pH value of the water discharged from the pickling tank 1 is less than 2, the water discharged from the pickling tank 1 needs to be neutralized, precipitated, filtered, and then a flocculant is added before being discharged.

[0043] When the pH value of the water discharged from the pickling tank 1 is greater than 2, the water discharged from the pickling tank 1 is neutralized and precipitated and then used as the rinsing hot water for the first several times in other pickling tanks 1.

[0044] In a more specific embodiment, 6m 3 Activated carbon, 4.2m 3 A sulfuric acid solution with a volume concentration of 15% is introduced into the pickling tank 1 to raise the temperature in the pickling tank 1 to 95°C and maintain it for one hour, so that the activated carbon is saturated with the sulfuric acid solution, which is conducive to removing the ash adsorbed in the activated carbon, and then the acid is released; continue to introduce steam to raise the temperature in the pickling tank 1 to 115-120°C. The high temperature environment is more conducive to the sulfuric acid solution dissolving the ash, and maintain it for three hours. During this period, condensed water is discharged every half an hour to prevent the condensed water from flooding the steam outlet and affecting the temperature in the pickling tank 1; after maintaining it for three hours, stop introducing steam and depressurize the pickling tank 1 to normal pressure, and add about 4m 3 The activated carbon is submerged in hot water of not less than 85°C and stirred by a stirring device. After half an hour, the acid solution is discharged to the first neutralization tank 2. Alkaline substances are added to the first neutralization tank 2 to neutralize the acid water. Since the acid solution discharged in the first few times has a high concentration and the salt produced after neutralization is also high, the acid solution in the first few times needs to be precipitated in the first waste brine tank. The solid impurities in the first waste brine tank are removed by the filter press 4. The solid impurities filtered out can be used for brick making. The water precipitated in the filtration process is mixed with the water in the first waste brine tank after adding the flocculant. It is discharged into the drain pipe to the sewage treatment plant; after several rinses, the concentration of the acid discharged from the pickling tank 1 is reduced. When the pH value of the acid is greater than 2, the acid discharged from the pickling tank 1 is discharged to the second neutralization tank 9, and alkaline substances are added to the second neutralization tank 9 and then discharged to the second waste brine tank for precipitation. Since the concentration of the acid is low at this time, the salt produced after neutralization is less, generally less than 2%. The neutralized and precipitated acid can directly enter the reuse water tank 6 and be used as the first few rinses in other pickling tanks 1 to achieve the purpose of water saving.

[0045] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0046] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An activated carbon treatment process, characterized in that: The following steps are involved: The first step is to put the activated carbon into a pickling tank and add an acid solution into the pickling tank, wherein the acid solution is a sulfuric acid solution with a volume concentration of 10-20%; The second step is to introduce steam into the pickling tank to raise the temperature in the pickling tank to 90-100°C and maintain it for one hour. During this process, the activated carbon adsorbs the sulfuric acid solution to a saturated state and then releases the acid solution. The third step is to continue to introduce steam to raise the temperature in the pickling tank to 115-120°C and maintain it for three hours; The fourth step is to stop the steam supply to the pickling tank and to vent the pickling tank to normal pressure; Step 5: Add hot water with a temperature of not less than 85°C to the pickling tank until the activated carbon is submerged, stir the activated carbon and hot water in the pickling tank, and drain the water in the pickling tank after half an hour; Step 6: Repeat step 5 several times until the pH value of the water discharged from the pickling tank is greater than 6, completing the pickling process.

2. The activated carbon treatment process according to claim 1, characterized in that: In the third step, the pickling tank is drained regularly to make the water level in the pickling tank lower than the steam outlet.

3. The activated carbon treatment process according to claim 1, characterized in that: When the pH value of the water discharged from the pickling tank is less than 2, the water discharged from the pickling tank needs to be neutralized, precipitated, filtered, and then flocculant is added before discharge.

4. The activated carbon treatment process according to claim 1, characterized in that: When the pH value of the water discharged from the pickling tank is greater than 2, the water discharged from the pickling tank is neutralized and precipitated and then used as hot water for the first several cleanings in the pickling tank.

5. An activated carbon treatment device, characterized in that: An activated carbon treatment process for use in any one of claims 1 to 4, comprising a plurality of pickling tanks arranged in parallel; a first neutralization tank and a second neutralization tank connected to the pickling tank, the first neutralization tank and the second neutralization tank being arranged in parallel; a first waste brine tank connected to the first neutralization tank; a filter press connected to the first waste brine tank; a flocculant tank connected to the filter press; a discharge pipe connected to the flocculant tank; a sedimentation tank connected to the discharge pipe; a second waste brine tank connected to the second neutralization tank; a reclaimed water tank connected to the reclaimed water tank, the reclaimed water tank being connected to the pickling tank; a stirring device being provided in the pickling tank; and an insulation layer being provided outside the pickling tank.

6. The activated carbon treatment equipment according to claim 5, characterized in that: The pickling tank is provided with a steam inlet.

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