A high-strength spherical activated carbon and its preparation method

Abstract

The application provides high-strength spherical activated carbon and a preparation method thereof; on one hand, sulfuric acid and a promoter system are used, over-sulfuric acid (H2SO5) is generated by the reaction of the sulfuric acid and the promoter, the oxidizability of the system is significantly enhanced in a short time, and the system has certain acidity, so that the removal of -H is realized on the basis of protection of the main chain structure of a polymer; on the other hand, iron ions are added, the corrosion to a reaction container can be inhibited, the reaction condition is mild, the material requirement of the reaction container is relatively low, and meanwhile, the yield and the strength of the spherical activated carbon are improved.

Description

Technical Field

[0001] This invention belongs to the field of activated carbon preparation technology, specifically relating to a high-strength spherical activated carbon and its preparation method. Background Technology

[0002] Spherical activated carbon, as a highly efficient activated adsorbent material, is widely used in water purification, air purification, personal protective equipment, medical and health care, and mine safety. Currently, it is mainly produced from PS (polystyrene) spheres through a process of pre-carbonization (or sulfonation), carbonization, and activation. The primary purpose of pre-carbonizing the PS spheres is to remove the -H atoms from the polystyrene molecules while preserving the main carbon chain structure of the polymer material, ensuring that the macroscopic structure remains intact and does not clump together.

[0003] Pre-carbonization to remove -H from the molecular structure of polymer materials can be achieved through two processes: (1) sulfonating -H to convert it into -SO3H, and then removing -SO3H by carbonization and heating; (2) directly oxidizing and carbonizing -H to remove it. Fuming sulfuric acid mainly treats dehydrogenation by sulfonation, which is reflected in the strong oxidizing ability and acidity of SO3. However, due to its strong sulfonation ability, excessive sulfonation will occur in the reaction of polystyrene molecules, thereby affecting the integrity of the main chain, resulting in material breakage and adversely affecting the strength of the product. The strength of activated carbon balls with a diameter of 0.4 mm to 0.6 mm in the US patent (US2008 / 0171648A1) is 5N to 20N. In addition, the storage, transportation and use of fuming sulfuric acid are dangerous and inconvenient. SO3 is highly corrosive to metals in the reaction, requiring the use of special steel materials, which is costly. The reaction tail gas contains a high amount of S, which puts great pressure on environmental protection treatment. The design of the tail gas treatment system is difficult and the cost of use is high. Concentrated sulfuric acid mainly carbonizes the dehydrogenation process, which is reflected in its acidity and certain oxidizing properties. However, due to the insufficient carbonization reaction capacity, a relatively long heating time is required, which leads to more side reactions such as the cracking of long polymer chains. This results in a long carbonization process, adhesion between the outer surfaces of the particulate materials, and almost no positive products. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] This invention proposes a high-strength spherical activated carbon and its preparation method to solve the technical problem of how to prepare high-strength spherical activated carbon.

[0006] (II) Technical Solution

[0007] To address the aforementioned technical problems, this invention proposes a method for preparing high-strength spherical activated carbon, which includes the following steps:

[0008] S1. Pre-carbonization

[0009] Sulfuric acid, accelerator, polystyrene spheres and ferrous compound are mixed evenly. The mixture is first heated to 200℃~240℃ and held for 20min~60min, then heated to 250℃~300℃ and held for 60min~120min to obtain a pre-carbonized reaction system.

[0010] S2. Carbonization

[0011] The carbonization process and the pre-carbonization process can be completed continuously or intermittently;

[0012] When the carbonization process and the pre-carbonization process are completed continuously, under the protective atmosphere of nitrogen or inert gas, the pre-carbonized reaction system at a temperature of 250℃~300℃ is heated to 500℃~600℃ and held for 60min~120min to obtain the carbonized reaction system.

[0013] When the carbonization process and the pre-carbonization process are completed intermittently, the pre-carbonized reaction system at room temperature is first heated to 120℃~160℃ and held for 10min~30min, then heated to 500℃~600℃ and held for 60min~120min. When the temperature rises above 300℃, nitrogen or inert gas is introduced into the reaction vessel for atmosphere protection to obtain the carbonized reaction system.

[0014] S3. Activation

[0015] The activation and carbonization processes can be completed continuously or intermittently.

[0016] When the activation process and the carbonization process are completed continuously, under the protective atmosphere of nitrogen or inert gas, the carbonized reaction system at a temperature of 500℃~600℃ is heated to 850℃~900℃ and kept at that temperature for 300min~900min. When the temperature rises above 800℃, water vapor is added to the reaction vessel to obtain spherical activated carbon.

[0017] When the activation and carbonization processes are completed intermittently, the carbonized reaction system at room temperature is heated to 850℃~900℃ and held at that temperature for 300min~900min. When the temperature rises above 300℃, nitrogen or inert gas is introduced into the reaction vessel for atmosphere protection. When the temperature rises above 800℃, water vapor is added to the reaction vessel to obtain spherical activated carbon.

[0018] Further, in step S1, in the mixture of sulfuric acid and accelerator, the molar ratio of sulfuric acid to accelerator is 6-11:1; the molar ratio of the number of polystyrene monomers that need to have -H removed to sulfuric acid is 7:2.5-3.5; the ratio of polystyrene spheres to ferrous ions is 1kg:0.01-0.1mol; and the accelerator is hydrogen peroxide, potassium persulfate, or ammonium persulfate.

[0019] Furthermore, in step S1, the particle size of the polystyrene spheres is 0.1 mm to 1.5 mm.

[0020] Furthermore, in step S1, the ratio of polystyrene spheres to sulfuric acid is 1 kg: 30 mol to 33.5 mol, and the ratio of polystyrene spheres to accelerator is 1 kg: 3 mol to 5.2 mol.

[0021] Further, in step S1, concentrated sulfuric acid with a mass fraction greater than 92% is selected; hydrogen peroxide with a mass fraction of 30% to 40% is selected as the accelerator; and ferrous compound is selected as ferrous sulfate, ferrous chloride, ferrous oxide, ferrous hydroxide, or ferrous carbonate.

[0022] Furthermore, in step S1, the temperature is raised to 200℃ to 240℃ within 30 min to 60 min; and the temperature is raised to 250℃ to 300℃ within 10 min to 30 min.

[0023] Furthermore, in step S1, the reaction vessel used in the pre-carbonization process is a converter, and the linear velocity of the converter is 0.5 m / min to 7 m / min.

[0024] Furthermore, in step S1, when the mass of the polystyrene spheres is 1g to 10kg, the reaction vessel is rotated at an angle of 30° to 45° to the horizontal plane until there is no obvious liquid in the reaction system, and then the reaction vessel is leveled.

[0025] Furthermore, in step S1, the reaction vessel used in the pre-carbonization process is made of glass, quartz, carbon steel, or stainless steel.

[0026] Furthermore, in step S2, the flow rate of water vapor added to the reaction vessel is 3 m³ / kg for every kilogram of carbonized reaction system. 3 / h~10m 3 / h.

[0027] (III) Beneficial Effects

[0028] This invention proposes a high-strength spherical activated carbon and its preparation method. On the one hand, it adopts a sulfuric acid and accelerator system, utilizing the reaction of sulfuric acid and accelerator to generate persulfate (H2SO5), which significantly enhances the oxidizing power of the system in a short time and has a certain acidity, achieving the removal of -H while protecting the polymer backbone structure. On the other hand, the addition of iron ions can inhibit the corrosion of the reaction vessel, the reaction conditions are mild, the requirements for the material of the reaction vessel are relatively low, and it is also beneficial to improve the yield and strength of the spherical activated carbon.

[0029] The beneficial effects of this invention specifically include:

[0030] 1. This invention uses a sulfuric acid and accelerator system for pre-carbonization. Compared with fuming sulfuric acid, it has reduced corrosiveness, allowing the reaction vessel to be made of glass, quartz, ordinary carbon steel, or stainless steel, thus lowering the requirements for reactor materials and reducing production costs. On the other hand, the reaction conditions are relatively mild, and with a reasonable reaction ratio design, the removal of -H can be effectively achieved while protecting the polymer backbone structure. Compared with concentrated sulfuric acid, sulfuric acid reacts with the accelerator to generate peroxymonosulfuric acid (H2SO5) which dissolves in sulfuric acid. This system has significantly enhanced oxidizing power in a short time and has a certain degree of acidity, providing suitable oxidizing and acidic properties for the pre-carbonization of PS balls. The reaction time is significantly shortened, side reactions are fewer, and the macroscopic shape and structure of the particles remain intact during the reaction.

[0031] 2. The addition of iron ions during the reaction process in this invention can inhibit corrosion of the reaction vessel, thus reducing the material requirements for the reaction vessel; at the same time, it can, to a certain extent, inhibit product adhesion, increase product yield, and improve product strength. This is because some of the Fe during the reaction process... 2+ It can penetrate into the interior of the material to form FeS and amorphous FeS. n FeS has very high strength, but because its content is not high, it does not exhibit crystalline form and does not affect the original carbon structure. It simply fills the vacant spaces, increasing the strength of the product, while having virtually no effect on other properties.

[0032] 3. The pre-carbonization process of this invention adopts a segmented heating method, which can ensure that PS is fully sulfonated and oxidized and carbonized while effectively avoiding the collapse of the PS skeleton structure and over-carbonization, which is beneficial to environmental protection, improves reaction safety and increases reaction yield;

[0033] 4. In the pre-carbonization process of the present invention, when the amount of reaction system is relatively small, the reaction container is tilted at a certain angle and rotated along the central axis to ensure that a certain amount of liquid reactants can be contained while achieving moderate stirring and uniform heating. When there is no obvious liquid in the reaction system, the reaction container is then placed flat, which allows the solid materials to be better turned over and better contacted with air to facilitate drying.

[0034] In summary, the method of the present invention has mild reaction conditions, low requirements for reaction vessel materials, improved safety, low sulfur content in the exhaust gas thus reducing environmental protection pressure, reduced preparation costs, reduced product breakage rate, increased product yield, and increased product strength, and has good application prospects. Attached Figure Description

[0035] Figure 1 The PXRD pattern of the spherical activated carbon prepared in Example 3 is shown below.

[0036] Figure 2 The image shows the Raman spectrum of the spherical activated carbon prepared in Example 3. Detailed Implementation

[0037] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0038] Example 1

[0039] (1) Pre-carbonization

[0040] 99g of concentrated H2SO4 (98% by mass), 6.5g of H2O2 (30% by mass), 30g of PS spheres (0.6±0.1mm in diameter), and 0.3g of FeSO4·7H2O were added to a quartz converter and mixed thoroughly. The temperature was first raised to 240℃ within 30 minutes and held for 40 minutes, then raised to 300℃ within 20 minutes and held for 60 minutes to obtain a pre-carbonized reaction system. During the pre-carbonization process, the linear velocity of the quartz converter was 0.6m / min. In the early stage of the reaction, the quartz converter was rotated at a 30° angle to the horizontal plane until there was no obvious liquid in the reaction system, at which point the quartz converter was leveled.

[0041] (2) Carbonization

[0042] The carbonization and sulfonation processes are completed intermittently. The specific operation is as follows: the pre-carbonized reaction system at room temperature is first heated to 120℃ within 30 minutes and held for 10 minutes, and then the temperature is further increased to 600℃ within 90 minutes and held for 120 minutes. When the temperature rises above 300℃, nitrogen gas is introduced into the quartz reaction vessel for atmosphere protection to obtain the carbonized reaction system.

[0043] (3) Activation

[0044] The activation and carbonization processes are completed continuously, and the specific operation is as follows: Under a nitrogen protective atmosphere, the carbonized reaction system at 600℃ is heated to 880℃ within 30 minutes and held at that temperature for 300 minutes. When the temperature reaches 800℃, a flow rate of 3m³ is added to the quartz reaction vessel. 3 21g of spherical activated carbon was obtained by steaming water at a rate of 1 h / h, with a total yield of 70%.

[0045] Characterization revealed that the average diameter of the prepared spherical activated carbon was (0.6±0.1) mm, and the BET value was 1220 m. 2 / g. The average strength of the spherical activated carbon was measured to be 52.56 N using a YHKC-2A particle strength tester, as detailed in Table 1.

[0046] Table 1

[0047] Serial Number Diameter, mm Strength, N 1 0.6 58.26 2 0.6 39.64 3 0.6 3.69 4 0.6 26.51 5 0.6 74.53 6 0.6 53.83 7 0.6 57.85 8 0.6 76.29 9 0.6 21.11 10 0.6 42.75 11 0.6 73.57 12 0.6 54.51 13 0.6 81.17 14 0.6 24.41 15 0.6 34.6 16 0.6 73.48 17 0.6 47.61 18 0.6 64.17 19 0.6 42.46 20 0.6 42.91 21 0.6 64.3 22 0.6 49.08 23 0.6 87 24 0.6 43 25 0.6 58.17 26 0.6 71.74 Maximum value 0.6 87 Minimum value 0.6 3.69 average value 0.6 52.56

[0048] Example 2

[0049] (1) Pre-carbonization

[0050] 3240g of concentrated H2SO4 (98% by mass), 220g of H2O2 (30% by mass), 1000g of PS spheres (0.6±0.1mm in diameter), and 30g of FeSO4·7H2O were added to a glass converter and mixed thoroughly. The temperature was first raised to 240℃ within 55min and held for 30min, and then raised to 300℃ within 30min and held for 100min to obtain a pre-carbonized reaction system. During the pre-carbonization process, the linear velocity of the glass converter was 6m / min. In the early stage of the reaction, the glass converter was rotated at a 30° angle to the horizontal plane until there was no obvious liquid in the reaction system, and then the glass converter was leveled.

[0051] (2) Carbonization

[0052] The carbonization and sulfonation processes are completed intermittently. The specific operation is as follows: the pre-carbonized reaction system at room temperature is first heated to 150℃ within 30 minutes and held for 20 minutes, and then the temperature is further increased to 580℃ within 60 minutes and held for 60 minutes. When the temperature rises above 300℃, nitrogen gas is introduced into the carbon steel reaction vessel for atmosphere protection to obtain the carbonized reaction system.

[0053] (3) Activation

[0054] The activation and carbonization processes are completed continuously, and the specific operation is as follows: Under a nitrogen protective atmosphere, the carbonized reaction system at 580℃ is heated to 880℃ within 60 minutes and held at that temperature for 400 minutes. When the temperature reaches 800℃, a flow rate of 5 m³ / h is added to the carbon steel reaction vessel. 3 612g of spherical activated carbon was obtained by steaming water at a rate of 1 h / h, with a total yield of 61%.

[0055] Characterization revealed that the average diameter of the prepared spherical activated carbon was (0.6±0.1) mm, and the BET value was 1200 μm. 2 / g. The average strength of the spherical activated carbon was measured to be 85.58 N using a YHKC-2A particle strength tester, as detailed in Table 2.

[0056] Table 2

[0057]

[0058]

[0059] Example 3

[0060] (1) Pre-carbonization

[0061] 303 kg of concentrated H2SO4 with a mass fraction of 98%, 24 kg of H2O2 with a mass fraction of 30%, 100 kg of PS spheres with a diameter of (0.6±0.1) mm and 300 g of FeSO4·7H2O were added to a carbon steel converter and mixed evenly. The temperature was first raised to 220℃ within 50 min and held for 25 min, and then the temperature was further raised to 300℃ within 30 min and held for 120 min. The linear velocity of the carbon steel converter was 6 m / min, and a pre-carbonized reaction system was obtained.

[0062] (2) Carbonization

[0063] The carbonization and sulfonation processes are completed intermittently. The specific operation is as follows: the pre-carbonized reaction system at room temperature is first heated to 150℃ within 90 minutes and held for 30 minutes, and then the temperature is further increased to 600℃ within 80 minutes and held for 100 minutes. When the temperature rises above 300℃, nitrogen gas is introduced into the carbon steel reaction vessel for atmosphere protection to obtain the carbonized reaction system.

[0064] (3) Activation

[0065] The activation and carbonization processes are completed continuously, and the specific operation is as follows: Under a nitrogen protective atmosphere, the carbonized reaction system at 600℃ is heated to 870℃ within 70 minutes and held at that temperature for 600 minutes. When the temperature reaches 840℃, a flow rate of 5m³ is added to the carbon steel reaction vessel. 3 60.5 kg of spherical activated carbon was obtained by steaming water at a rate of 1 h / h, with a total yield of 60.5%.

[0066] Characterization revealed that the average diameter of the prepared spherical activated carbon was (0.6±0.1) mm, and the BET value was 1200 μm. 2 / g. The average strength of the spherical activated carbon was measured to be 93.42 N using a YHKC-2A particle strength tester, as detailed in Table 3.

[0067] Table 3

[0068]

[0069]

[0070] Figure 1 The PXRD spectrum of the spherical activated carbon prepared in Example 3 shows that only two broadened diffraction peaks are visible in the range of 10–80° (2θ), which are attributed to amorphous carbon. No obvious diffraction peaks of Fe and S related compounds are seen in the spectrum, indicating that their content is not high or that they have not aggregated to form obvious crystals.

[0071] Figure 2The image shows the Raman spectrum of the spherical activated carbon prepared in Example 3. Only one obvious diffraction peak belonging to the vibration of activated carbon can be seen in the spectrum, which further indicates that Fe and S related compounds may only exist on the surface of activated carbon or be incorporated into the activated carbon skeleton.

[0072] Elemental analysis was performed on the carbonized sample after carbonization in Example 3, the activated sample after activation in Example 3, coal-based activated carbon (DX-09), and the Sartoka prepared according to the German patented technology. The ICP-AES results are detailed in Table 4. As shown in Table 4, compared with DX-09, the carbonized and activated samples of Example 3 do not contain Mg, P, Zn, Sr, and Zr, but have a higher S content (due to the sulfonation technology used in the pre-carbonization process). Compared with Sartoka, the activated sample of Example 3 has less Ti, Cr, and Ce, but more Mn and a higher Fe content, because this process optimizes the process, eliminating the need for expensive special stainless steel in the reaction vessel material. Furthermore, no significant increase in Fe content was detected in the carbonized sample of Example 3, indicating that Fe may only exist on the surface and has an upper concentration limit (saturation concentration).

[0073] Table 4

[0074]

[0075]

[0076] Comparative Example 1

[0077] 108g of concentrated H2SO4 with a mass fraction of 98% and 15g of PS spheres with a diameter of (0.3±0.1)mm were added to a glass converter and mixed evenly. The temperature was raised to 230℃ within 25min and held for 60min. The reaction system turned black and black lumps appeared on the glass converter wall. Moreover, the product in the glass converter formed a whole block. Due to the severe product adhesion, the structure of the PS spheres after pre-carbonization was severely damaged. During the pre-carbonization process, the linear velocity of the glass converter was 0.6m / min. In the early stage of the reaction, the glass converter was rotated at a 30° angle to the horizontal plane until there was no obvious liquid in the reaction system, and then the glass converter was leveled.

[0078] Comparative Example 2

[0079] (1) Pre-carbonization

[0080] 99g of concentrated H2SO4 (98% by mass), 6.5g of H2O2 (30% by mass), and 30g of PS spheres (0.3±0.1mm in diameter) were added to a quartz converter and mixed thoroughly. The temperature was first raised to 240℃ within 30 minutes and held for 40 minutes, then raised to 300℃ within 20 minutes and held for 60 minutes. Black lumps appeared on the walls of the quartz converter, and a small amount of lumps were present in the black product inside the quartz converter. After sieving to remove the lumps, the powder obtained was the pre-carbonized reaction system. During the pre-carbonization process, the linear velocity of the quartz converter was 0.6m / min. In the early stage of the reaction, the quartz converter was rotated at a 30° angle to the horizontal plane until there was no obvious liquid in the reaction system, at which point the quartz converter was leveled.

[0081] (2) Carbonization

[0082] The carbonization and sulfonation processes are completed intermittently. The specific operation is as follows: the pre-carbonized reaction system at room temperature is first heated to 120℃ within 30 minutes and held for 10 minutes, and then the temperature is further increased to 600℃ within 90 minutes and held for 120 minutes. When the temperature rises above 300℃, nitrogen gas is introduced into the quartz reaction vessel for atmosphere protection to obtain the carbonized reaction system.

[0083] (3) Activation

[0084] The activation and carbonization processes are completed continuously, and the specific operation is as follows: Under a nitrogen protective atmosphere, the carbonized reaction system at 600℃ is heated to 880℃ within 30 minutes and held at that temperature for 300 minutes. When the temperature reaches 800℃, a flow rate of 3m³ is added to the quartz reaction vessel. 3 13g of spherical activated carbon was obtained by steaming water at a rate of 1 h, with a total yield of 43%.

[0085] Characterization revealed that the average diameter of the prepared spherical activated carbon was (0.2±0.1) mm, and the BET value was 1310 m. 2 / g. The average strength of the spherical activated carbon was measured to be 34.00 N using a YHKC-2A particle strength tester, as detailed in Table 5.

[0086] Table 5

[0087] Serial Number Diameter, mm Strength, N 1 0.3 36.43 2 0.3 33.34 3 0.3 57.82 4 0.3 3.79 5 0.3 36.27 6 0.3 25.06 7 0.3 37.81 8 0.3 36.38 9 0.3 11.5 10 0.3 62.33 11 0.3 53.75 12 0.3 5.81 13 0.3 62.74 14 0.3 26.21 15 0.3 19.87 16 0.3 45.24 17 0.3 54.38 18 0.3 22.12 19 0.3 44.62 20 0.3 19.84 21 0.3 24.64 22 0.3 27.68 23 0.3 24.63 24 0.3 55.7 25 0.3 47.69 26 0.3 8.42 Maximum value 0.3 62.74 Minimum value 0.3 3.79 average value 0.3 34.00

[0088] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing high-strength spherical activated carbon, characterized by, The preparation method comprises the following steps: S1. Pre-carbonization Concentrated sulfuric acid with a mass fraction of greater than 92%, hydrogen peroxide with a mass fraction of 30% to 40%, polystyrene balls and ferrous sulfate are uniformly mixed, first heated to 200℃ to 240℃ and kept for 20min to 60min, and then heated to 250℃ to 300℃ and kept for 60min to 120min to obtain a pre-carbonized reaction system; S2. Carbonization The carbonization process is continuously completed or intermittently completed with the pre-carbonization process; When the carbonization process is continuously completed with the pre-carbonization process, the pre-carbonized reaction system at a temperature of 250℃ to 300℃ is heated to 500℃ to 600℃ and kept for 60min to 120min under an inert gas protection atmosphere to obtain a carbonized reaction system; When the carbonization process is intermittently completed with the pre-carbonization process, the pre-carbonized reaction system at room temperature is first heated to 120℃ to 160℃ and kept for 10min to 30min, and then heated to 500℃ to 600℃ and kept for 60min to 120min, wherein inert gas is introduced into the reaction container for atmosphere protection when the temperature is raised to above 300℃, to obtain a carbonized reaction system; S3. Activation The activation process is continuously completed or intermittently completed with the carbonization process; When the activation process is continuously completed with the carbonization process, the carbonized reaction system at a temperature of 500℃ to 600℃ is heated to 850℃ to 900℃ and kept for 300min to 900min under an inert gas protection atmosphere, wherein water vapor is added to the reaction container when the temperature is raised to above 800℃, to obtain spherical activated carbon; When the activation process is intermittently completed with the carbonization process, the carbonized reaction system at room temperature is heated to 850℃ to 900℃ and kept for 300min to 900min, wherein inert gas is introduced into the reaction container for atmosphere protection when the temperature is raised to above 300℃, and water vapor is further added to the reaction container when the temperature is raised to above 800℃, to obtain spherical activated carbon.

2. The method of claim 1, wherein the high-strength spherical activated carbon is prepared by the steps of: In step S1, the molar ratio of sulfuric acid to hydrogen peroxide in the mixed system is 6 to 11:1; the molar ratio of the number of moles of polystyrene monomer that needs to be removed to the number of moles of sulfuric acid is 7:2.5 to 3.5; and the ratio of polystyrene balls to ferrous ions is 1 kg:0.01 to 0.1 mol. ​ 3. The method for preparing high-strength spherical activated carbon as described in claim 1, characterized in that, In step S1, the particle size of the polystyrene balls is 0.1mm to 1.5mm.

4. The method for preparing high-strength spherical activated carbon as described in claim 1, characterized in that, In step S1, the ratio of polystyrene balls to sulfuric acid is 1kg:30mol to 33.5mol, and the ratio of PS balls to hydrogen peroxide is 1kg:3mol to 5.2mol.

5. The method for preparing high-strength spherical activated carbon as described in claim 1, characterized in that, In step S1, the temperature is raised to 200℃ to 240℃ within 30min to 60min, and the temperature is raised to 250℃ to 300℃ within 10min to 30min.

6. The method for preparing high-strength spherical activated carbon as described in claim 1, characterized in that, In step S1, the reaction container used in the pre-carbonization process is a rotary furnace, and the linear speed of the rotary furnace is 0.5m / min to 7m / min.

7. The method for preparing high-strength spherical activated carbon as described in claim 1, characterized in that, In step S1, the polystyrene balls have a mass of 1 g to 10 kg, the reaction vessel is rotated at an angle of 30° to 45° to the horizontal until the reaction system is free of liquid, and then the reaction vessel is placed horizontally.

8. The method for preparing high-strength spherical activated carbon as described in claim 1, characterized in that, In step S1, the reaction vessel used in the pre-carbonization process is made of glass, quartz, carbon steel or stainless steel.

9. The method for preparing high-strength spherical activated carbon as described in claim 1, characterized in that, In step S3, the flow rate of water vapor added to the reaction vessel is 3 m 3 / h~10 m 3 / h per kilogram of the carbonized reaction system.

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