Gasification slag / fly ash adsorbed particles, and preparation method and application thereof

Abstract

The application relates to the field of solid waste recycling, and specifically discloses a gasification slag / coal ash adsorption particle, a preparation method and application thereof, the preparation method comprises the following steps: drying and grinding gasification slag and coal ash to obtain a preliminary mixture; mixing and stirring the preliminary mixture with a composite acid modifier to perform acid leaching modification; washing the preliminary mixture after acid leaching modification to neutralization, drying, then microwave treatment, and then drying to obtain a pretreated mixture; mixing and stirring the pretreated mixture with a composite alkali to form a slurry for alkali leaching modification, tumbling and granulating to obtain mixed particles; solidifying and hardening the mixed particles to obtain the gasification slag / coal ash adsorption particle; the application also discloses the gasification slag / coal ash adsorption particle prepared by the above preparation method and application thereof in the field of water treatment. The application has the characteristics of realizing gasification slag solid waste utilization and improving the adsorption effect of the gasification slag and coal ash on the refractory organic matter in sewage.

Description

Technical Field

[0001] This application relates to the field of solid waste recycling technology, and more specifically, it relates to a gasification slag / fly ash adsorption particle, its preparation method, and its application. Background Technology

[0002] Gasification slag is a solid residue formed from carbonaceous particles remaining in the coal after incomplete combustion of coal. It contains numerous porous structures and active functional groups. Fly ash is a solid waste emitted by coal-fired power plants, primarily composed of aluminum, silicon, and calcium glass microspheres, and is an inorganic powder medium. Currently, the main methods for treating gasification slag and fly ash are stockpiling and landfilling, resulting in the waste of land resources and environmental pollution. Furthermore, stockpiled gasification slag and fly ash easily generate dust, causing air pollution. With the national policy of "production based on quantity" for solid waste management, how to achieve large-scale industrial utilization of gasification slag and fly ash has become a major challenge hindering the development of the coal gas chemical industry and the coal-fired power industry, respectively.

[0003] Currently, a small amount of coal gasification slag is recycled for use in construction materials, including the production of ceramsite, cement, concrete wall materials, and bricks. Recently, an article reported the use of a cyclone washing process for gasification slag. Specifically, the slag undergoes dilution and separation by a screw conveyor, further separation by a hydrocyclone, and vibration dehydration to produce new products such as porous silicon, porous carbon, and porous fine powder, thus realizing the utilization of the slag. However, this method suffers from low conversion rates and complex procedures, necessitating further research into its reuse. In particular, given the porous structure of the slag, researching its reuse for water treatment adsorption is of great significance in the water treatment field. Summary of the Invention

[0004] In order to realize the reuse of gasification slag in the field of water treatment adsorption, this application provides a gasification slag / fly ash adsorption particle, its preparation method and application.

[0005] In a first aspect, this application provides a method for preparing gasification slag / fly ash adsorbent particles, employing the following technical solution:

[0006] A method for preparing gasification slag / fly ash adsorbent particles includes the following steps:

[0007] S1. After drying, the gasification slag and fly ash are ground and mixed to obtain a preliminary mixture;

[0008] S2. Mix the initial mixture with the composite acid modifier and stir to carry out acid leaching modification;

[0009] S3. Wash the acid-modified initial mixture with water until neutral, dry it, then microwave it, and then dry it again to obtain the pretreated mixture.

[0010] S4. Mix the pretreated mixture with the composite alkali to form a slurry, then perform alkali leaching modification, tumble granulation, and obtain mixed particles.

[0011] S5. The mixed particles are solidified and hardened, and then dried to obtain gasification slag / fly ash adsorption particles.

[0012] By adopting the above technical solution, this application utilizes the porous structure of industrial solid waste gasification slag and the composition of fly ash, which is mainly composed of aluminum, silicon, and calcium glass microspheres. Through acid leaching modification, a composite acid modifier dissolves and releases the metal oxides blocking the micropores inside the gasification slag, thereby unblocking and releasing the micropores. Furthermore, it etches more channels and adsorption sites inside the gasification slag, adjusting the distribution of macropores, mesopores, and micropores. Then, microwave modification expands the internal channels of the gasification slag, increasing its specific surface area, thus enhancing the quality of the resulting gasification slag / fly ash. The adsorption particles not only exhibit excellent adsorption performance for recalcitrant organic matter in wastewater, but acid leaching modification can also dissolve the aluminum, silicon, and calcium glass microspheres inside fly ash. The dissolved aluminum ions can also flocculate recalcitrant organic matter in wastewater. Alkali leaching modification, through the coagulation and hardening reaction between the acid-dissolved silicon and calcium and the alkali, and the hydration reaction with fly ash to form calcium silicate hydrate, solidifies and hardens the gasification slag / fly ash powder, resulting in stable particles with higher porosity and larger specific surface area than powder, thus providing a superior water treatment effect.

[0013] This application modifies a mixture of gasification slag and fly ash through the synergistic effect of acid leaching and microwave treatment, and then solidifies or hardens the mixture through alkaline leaching to obtain gasification slag / fly ash adsorption particles. These particles replace activated carbon for the adsorption and treatment of recalcitrant small-molecule organic pollutants in wastewater. Furthermore, the resulting gasification slag / fly ash adsorption particles exhibit improved adsorption performance for recalcitrant small-molecule organic pollutants in wastewater, while simultaneously reducing wastewater treatment costs. This achieves the resource utilization of gasification slag and fly ash, realizing the goal of treating waste with waste, and solving the problems of land resource waste and environmental pollution caused by current gasification slag and fly ash treatment methods. Compared to the gasification slag vortex washing process for reuse, the treatment method in this application is simpler, with lower requirements for equipment and operation, and solves the problems of high difficulty and high cost in treating recalcitrant small-molecule organic pollutants in wastewater.

[0014] Optionally, in step S1, the gasification slag and fly ash are ground and mixed in a mass ratio of 1:(1-3).

[0015] By adopting the above technical solution, the gasification slag / fly ash prepared by mixing gasification slag and fly ash in the above ratio has a better adsorption effect on organic pollutants and a better water treatment effect.

[0016] Optionally, in step S2, the composite acid modifier includes one or more of sulfuric acid, nitric acid, hydrochloric acid, and citric acid.

[0017] Optionally, in step S2, the mass concentration of the composite acid modifier is 0.5-5%, and the mass ratio of the initial mixture to the composite acid modifier is 1:(10-12), and the stirring time is 2-4 hours.

[0018] Optionally, in step S3, the microwave processing time is 30-90s and the microwave power is 300-800W.

[0019] Optionally, in step S4, the compound alkali is added in the form of a compound alkali solution with a mass fraction of 15-25%, and the compound alkali is selected from one or more of sodium hydroxide, sodium carbonate, potassium hydroxide and calcium hydroxide.

[0020] Optionally, in step S4, the mass ratio of the pretreated mixture to the added compound alkali is (4-5):1.

[0021] By adopting the above technical solution and selecting the above proportion of compound alkali and pretreatment mixture, the treatment effect on gasification slag and fly ash is better, and the adsorption performance of the gasification slag / fly ash adsorption particles is more excellent.

[0022] Optionally, in step S5, the specific operation for the solidification and hardening of the mixed particles is as follows: the mixed particles are stored for 3-5 days at a temperature of 20-25℃ and a humidity of 40-50%.

[0023] Optionally, the drying conditions in steps S1, S3 and S5 are: drying temperature 50-100℃ and drying time 1.5-4.5h.

[0024] Secondly, this application provides a gasification slag / fly ash adsorption particle, which adopts the following technical solution:

[0025] A gasification slag / fly ash adsorbent particle is prepared by the preparation method described above.

[0026] By adopting the above technical solution, the gasification slag / fly ash adsorption particles prepared by the method in this application can replace activated carbon for the adsorption treatment of recalcitrant organic matter in wastewater, thereby achieving the purpose of treating waste with waste and solving the treatment problems of gasification slag and fly ash.

[0027] Thirdly, this application provides an application of gasification slag / fly ash adsorption particles, using the following technical solution: an application of gasification slag / fly ash adsorption particles in water treatment.

[0028] In summary, this application has the following beneficial effects:

[0029] 1. This application modifies a mixture of gasification slag and fly ash through the synergistic effect of acid leaching and microwave treatment, and then solidifies or hardens the mixture through alkaline leaching to obtain gasification slag / fly ash adsorption particles. These particles replace activated carbon for the adsorption and treatment of recalcitrant small-molecule organic pollutants in wastewater. Furthermore, the adsorption performance of the resulting gasification slag / fly ash adsorption particles for recalcitrant small-molecule organic pollutants in wastewater is further improved, while simultaneously reducing wastewater treatment costs. This achieves the resource utilization of gasification slag and fly ash, realizing the goal of treating waste with waste, and solving the problem of land resource waste and environmental pollution caused by current methods of treating gasification slag and fly ash. This application addresses the challenges of treating recalcitrant small-molecule organic matter in wastewater, including high difficulty and cost. It also utilizes the porous structure of industrial solid waste gasification slag and the composition of fly ash, which is primarily composed of aluminum, silicon, and calcium glass microspheres. Through the synergistic effects of acid leaching and microwave modification, the active aluminum component with flocculation properties in fly ash is dissolved, while simultaneously etching more channels and adsorption sites onto the gasification slag. This adjusts the distribution of macropores, mesopores, and micropores in the gasification slag, achieving the goal of adsorbing small-molecule organic matter into the micropores of the gasification slag and aggregating large-molecule organic matter in the macropores and mesopores of the gasification slag after flocculation by aluminum leaching, thereby maximizing the removal of recalcitrant organic matter.

[0030] 3. In this application, the alkaline leaching modification involves the coagulation and hardening reaction of silicon and calcium dissolved by acid with alkali, and the formation of calcium silicate hydrate through hydration with fly ash. This process solidifies and hardens the gasification slag / fly ash powder, resulting in stable particles with higher porosity and larger specific surface area compared to powder. The composite modification treatment of gasification slag and fly ash in this application improves the adsorption efficiency of gasification slag and fly ash for recalcitrant organic matter in wastewater, and also achieves the purpose of solid waste reuse. Attached Figure Description

[0031] Figure 1 This is a macroscopic flowchart of the method in Embodiment 1 of this application;

[0032] Figure 2 This is a microscopic schematic diagram of the method in Embodiment 1 of this application;

[0033] Figure 3 This is a photograph of the morphology of the gasification residue in Example 1 of this application;

[0034] Figure 4 This is a photograph of the morphology of the gasification slag / fly ash mixture obtained after grinding and mixing gasification slag and fly ash in step S1 of Embodiment 1 of this application.

[0035] Figure 5 This is a photograph of the morphology of the gasification slag / fly ash adsorbed particles obtained in step S5 of Example 1 of this application.

[0036] Figure 6This is a scanning electron microscope image of the gasification slag raw material in Example 1 of this application;

[0037] Figure 7 This is a scanning electron microscope image of the gasification slag / fly ash mixed slag obtained after grinding and mixing gasification slag and fly ash in step S1 of Embodiment 1 of this application;

[0038] Figure 8 This is a scanning electron microscope image of the gasification slag / fly ash adsorbed particles obtained in step S5 of Example 1 of this application. Detailed Implementation

[0039] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that: unless otherwise specified in the following embodiments, the conditions are carried out according to conventional conditions or the conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following embodiments can be obtained from commercially available sources.

[0040] Example 1

[0041] A method for preparing gasification slag / fly ash adsorbent particles, referring to... Figure 1 and Figure 2 This includes the following steps:

[0042] S1. The gasification slag produced by a coal gasification furnace in Shaanxi and the fly ash produced by a thermal power plant in Shaanxi are dried at 80°C for 2 hours. Then, they are ground and mixed in a special ball mill at a mass ratio of 1:2. The mixture is then passed through a 200-mesh sieve and the material passing through the sieve is taken as the initial mixture.

[0043] S2. Mix the initial mixture with the composite acid modifier at a mass ratio of 9:100 and stir to carry out acid leaching modification, wherein the composite acid modifier is hydrochloric acid with a mass concentration of 2.5%.

[0044] S3. After washing the acid-modified initial mixture with water until neutral, dry it at 80℃ for 2.5 hours. Then, mix the washed initial mixture with water at a mass ratio of 1:1 and microwave it for 60 seconds at a power of 500W. Then dry it at 80℃ for 2.5 hours to obtain the pretreated mixture.

[0045] S4. Mix the pretreated mixture with the compound alkali at a mass ratio of 4.5:1 to form a slurry for alkali leaching modification. Then, granulate the slurry by tumbling in a granulator to obtain mixed granules. The compound alkali is sodium hydroxide, which is added in the form of a sodium hydroxide solution with a mass fraction of 15-25%.

[0046] S5. The mixed particles are stored at 23℃ and 45% humidity for 4 days to solidify and harden, and then dried to obtain gasification slag / fly ash adsorption particles. The drying temperature is 80℃ and the drying time is 2.5h.

[0047] Example 2

[0048] A method for preparing gasification slag / fly ash adsorbent particles includes the following steps:

[0049] S1. The gasification slag produced by a coal gasification furnace in Shaanxi and the fly ash produced by a thermal power plant in Shaanxi are dried at 50°C for 4.5 hours. Then, they are ground and mixed in a 1:1 mass ratio on a special ball mill. The mixture is then passed through a 200-mesh sieve, and the material passing through the sieve is taken as the initial mixture.

[0050] S2. Mix the initial mixture with the composite acid modifier at a mass ratio of 1:10 and stir to carry out acid leaching modification, wherein the composite acid modifier is sulfuric acid with a mass concentration of 0.5%;

[0051] S3. After washing the acid-modified initial mixture with water until neutral, dry it at 50°C for 4.5 hours. Then, mix the washed initial mixture with water at a mass ratio of 1:1 and microwave it for 30 seconds at a power of 800W. Then dry it at 50°C for 4.5 hours to obtain the pretreated mixture.

[0052] S4. The pretreated mixture and the compound alkali are mixed and stirred into a slurry at a mass ratio of 4:1 for alkali leaching modification. The slurry is then tumbled and granulated in a granulator to obtain mixed particles. The compound alkali is potassium hydroxide, which is added in the form of a 15% potassium hydroxide solution.

[0053] S5. The mixed particles are stored at 20℃ and 40% humidity for 5 days to solidify and harden, and then dried to obtain gasification slag / fly ash adsorption particles. The drying temperature is 50℃ and the drying time is 4.5h.

[0054] Example 3

[0055] A method for preparing gasification slag / fly ash adsorbent particles includes the following steps:

[0056] S1. The gasification slag produced by a coal gasification furnace in Shaanxi and the fly ash produced by a thermal power plant in Shaanxi are dried at 100℃ for 1.5 hours. Then, they are ground and mixed in a special ball mill at a mass ratio of 1:3. The mixture is then passed through a 200-mesh sieve, and the material passing through the sieve is taken as the initial mixture.

[0057] S2. Mix the initial mixture with the composite acid modifier at a mass ratio of 1:12 and stir to carry out acid leaching modification, wherein the composite acid modifier is citric acid with a mass concentration of 5%.

[0058] S3. After washing the acid-modified initial mixture with water until neutral, dry it at 100℃ for 1.5h. Then, mix the washed initial mixture with water at a mass ratio of 1:1 and microwave it for 90s at a power of 300W. Then dry it at 100℃ for 1.5h to obtain the pretreated mixture.

[0059] S4. Mix the pretreated mixture with the compound alkali at a mass ratio of 5:1 to form a slurry for alkali leaching modification. Then, granulate the slurry by tumbling in a granulator to obtain mixed particles. The compound alkali is a mixture of potassium hydroxide and calcium hydroxide at a mass ratio of 1:1. The compound alkali is added in the form of a 25% mass fraction compound alkali solution.

[0060] S5. The mixed particles are stored at 25℃ and 50% humidity for 3 days to solidify and harden, and then dried to obtain gasification slag / fly ash adsorption particles. The drying temperature is 100℃ and the drying time is 1.5h.

[0061] Example 4

[0062] A method for preparing gasification slag / fly ash adsorbent particles is carried out according to the method in Example 1, except that the gasification slag and fly ash are ground and mixed at a mass ratio of 1:0.8.

[0063] Example 5

[0064] A method for preparing gasification slag / fly ash adsorbent particles is carried out according to the method in Example 1, except that the composite acid modifier is hydrochloric acid and citric acid in a mass ratio of 1:1.

[0065] Example 6

[0066] A method for preparing gasification slag / fly ash adsorbent particles is carried out according to the method in Example 1, except that the mass ratio of the pretreatment mixture to the composite alkali is 2:1.

[0067] Comparative Example 1

[0068] A method for preparing adsorbent particles is carried out according to the method in Example 1, except that fly ash is replaced with gasification slag in an equal amount in the raw materials.

[0069] Comparative Example 2

[0070] A method for preparing adsorbent particles is carried out according to the method in Example 1, except that the gasification slag is replaced with an equal amount of fly ash in the raw materials.

[0071] Comparative Example 3

[0072] A method for preparing gasification slag / fly ash adsorbent particles is carried out according to the method in Example 1, except that the initial mixture after acid leaching modification in step S3 is washed with water until neutral and dried, and then directly subjected to alkaline leaching treatment in step S4, without microwave treatment.

[0073] Comparative Example 4

[0074] A method for preparing gasification slag / fly ash adsorbent particles is carried out according to the method in Example 1, except that the pretreated mixture obtained after microwave treatment in step S3 is directly granulated and then carried out in step S5, without the alkaline leaching modification treatment in step S4.

[0075] Performance testing

[0076] See Figures 3-5 The images show the morphology of the gasification slag in Example 1, the gasification slag / fly ash mixture obtained by grinding and mixing the gasification slag and fly ash in step S1, and the gasification slag / fly ash adsorbed particles obtained after treatment in step S5. These images are combined with photographic images of the original gasification slag in Example 1, the gasification slag / fly ash mixture obtained by grinding and mixing the gasification slag and fly ash in step S1, and the morphology of the adsorbed particles obtained after treatment in step S5. Figure 6-8 The images are scanning electron microscope (SEM) images of the original gasification slag in Example 1, the gasification slag / fly ash mixed slag obtained by grinding and mixing gasification slag and fly ash in step S1, and the gasification slag / fly ash adsorbent particles obtained after treatment in step S5. It can be seen that the final adsorbent particles have better porosity and larger specific surface area, and realize the distribution of macropores, mesopores and micropores in the gasification slag.

[0077] The gasification slag / fly ash adsorbent particles prepared in the above embodiments and comparative examples were respectively reacted with the biochemical effluent (COD) from a tannery wastewater treatment plant. Cr Mix the solutions (375 mg / L) at a mass ratio of 5:1000, shake at 180 rpm for 2.5 h at room temperature, and then measure the COD of the supernatant. Cr The measurement results are shown in Table 1 below.

[0078] Table 1:

[0079]

[0080] As shown in Table 1 above, the gasification slag / fly ash adsorption particles prepared by the method of this application have a high removal rate of organic pollutants when used for water treatment. Combined with the test results of Examples 1 and 4, the mass ratio of gasification slag to fly ash has a certain impact on its removal effect. When the amount of fly ash added is relatively small, its removal effect on organic pollutants is reduced. Referring to the test results of Examples 1 and 5, when the composite acid modifier is a combination of strong acid and weak acid, the removal effect of the gasification slag / fly ash adsorption particles on organic pollutants is slightly improved. Referring to the test results of Examples 1 and 6, when the pretreatment mixture and composite alkali are combined, when the amount of pretreatment mixture added is small, the removal effect of the gasification slag / fly ash adsorption particles on organic pollutants is also reduced.

[0081] Referring to the test results of Example 1, Comparative Examples 1 and 2, the adsorption particles obtained by modifying only the gasification slag or fly ash unit material showed a significant reduction in their treatment effect on organic pollutants in wastewater. Referring to the test results of Comparative Example 3, when gasification slag and fly ash were modified with acid and alkali but not with microwave modification, they mainly formed pores for adsorption without flocculation or other effects, resulting in a significant reduction in the removal effect on organic pollutants in wastewater. Referring to the test results of Comparative Example 4, in Comparative Example 4, only acid modification was performed followed by microwave modification, without alkali modification, and the final gasification slag / fly ash adsorption particles still showed limited removal effect on organic pollutants in water.

[0082] In addition, the gasification slag / fly ash adsorbent particles obtained in Example 1 were mixed with the biochemical effluent (COD) from a tannery pollution treatment plant. Cr Mix the solutions (containing 334 mg / L) at a mass ratio of 4:1000, shake at 100 rpm for 3 hours at room temperature, and then measure the COD of the supernatant. CR After adsorption treatment by gasification slag / fly ash adsorption particles, the COD of the effluent is reduced. Cr The concentration was 73 mg / L, indicating a good effect in adsorbing and removing organic pollutants.

[0083] In addition, following the method provided in Example 1, gasification slag from a gasifier in Inner Mongolia and fly ash from a thermal power plant in Inner Mongolia were selected as raw materials for processing. The resulting gasification slag / fly ash adsorbent particles were then reacted with the biochemical effluent (COD) from the wastewater treatment plant of a collagen peptide factory. Cr Mix the solutions (181 mg / L) at a mass ratio of 1:1000, shake at 120 rpm for 2 hours at room temperature, and then measure the COD of the supernatant. CR After adsorption treatment by gasification slag / fly ash adsorption particles, the COD of the effluent is reduced. Cr The concentration was 61 mg / L; simultaneously, the prepared gasification slag / fly ash adsorbent particles were reacted with the biochemical effluent (COD) from a paper mill wastewater treatment plant.Cr Mix the solutions (containing 196 mg / L) at a mass ratio of 2:1000, shake at 130 rpm for 3 hours at room temperature, and then measure the COD of the supernatant. CR After adsorption treatment by gasification slag / fly ash adsorption particles, the COD of the effluent is reduced. Cr It is 64 mg / L.

[0084] Next, gasification slag from a coal gasification furnace in Shanxi and fly ash from a thermal power plant in Shanxi were selected and modified according to the method in Example 1. The resulting gasification slag / fly ash adsorbent particles were then reacted with the biochemical effluent (COD) from a wastewater treatment plant of a paper mill. Cr The concentration of the sample (236 mg / L) was mixed at a mass ratio of 3:1000, shaken at 160 rpm for 2.5 h at room temperature, and the COD of the supernatant was measured. CR After adsorption treatment by gasification slag / fly ash adsorption particles, the COD of the effluent is reduced. Cr The concentration was 69 mg / L.

[0085] Obviously, by selecting gasification slag and fly ash from different locations and processing them according to the method provided in this application, the resulting gasification slag / fly ash adsorption particles, when mixed with biochemical effluent from different wastewater treatment plants in different fields, all exhibit excellent adsorption and removal effects. The gasification slag / fly ash adsorption particles obtained in this application have universal applicability for the removal of organic pollutants.

[0086] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A method for preparing gasification slag / fly ash adsorbent particles, characterized in that, Includes the following steps: S1. After drying, the gasification slag and fly ash are ground and mixed to obtain a preliminary mixture; S2. Mix the initial mixture with the composite acid modifier and stir to carry out acid leaching modification; S3. Wash the acid-modified initial mixture with water until neutral, dry it, then microwave it, and then dry it again to obtain the pretreated mixture. S4. Mix the pretreated mixture with the composite alkali to form a slurry, then perform alkali leaching modification, tumble granulation, and obtain mixed particles. S5. Solidify and harden the mixed particles, and dry them to obtain gasification slag / fly ash adsorption particles. The mass concentration of the composite acid modifier is 0.5-5%, and the mass ratio of the initial mixture to the composite acid modifier is 1:(10-12). The mass ratio of the pretreated mixture to the compound alkali is (4-5):1; In step S2, the composite acid modifier includes one or more of sulfuric acid, nitric acid, hydrochloric acid, and citric acid; In step S4, the compound alkali is added in the form of a compound alkali solution with a mass fraction of 15-25%, and the compound alkali is selected from one or more of sodium hydroxide, sodium carbonate, potassium hydroxide and calcium hydroxide. The gasification slag / fly ash adsorption particles prepared by the above method are used for the adsorption and removal of organic matter in water treatment.

2. The method for preparing gasification slag / fly ash adsorption particles according to claim 1, characterized in that: In step S1, the gasification slag and fly ash are ground and mixed in a mass ratio of 1:(1-3).

3. The method for preparing gasification slag / fly ash adsorption particles according to claim 1, characterized in that: In step S2, the stirring time is 2-4 hours.

4. The method for preparing gasification slag / fly ash adsorption particles according to claim 1, characterized in that: In step S3, the microwave processing time is 30-90 seconds and the microwave power is 300-800W.

5. The method for preparing gasification slag / fly ash adsorption particles according to claim 1, characterized in that: In step S5, the specific operation for the solidification and hardening of the mixed particles is as follows: the mixed particles are stored for 3-5 days at a temperature of 20-25℃ and a humidity of 40-50%.

6. The method for preparing gasification slag / fly ash adsorption particles according to claim 1, characterized in that: The drying conditions in steps S1, S3 and S5 are: drying temperature 50-100℃ and drying time 1.5-4.5h.

7. A gasification slag / fly ash adsorbent particle prepared by the preparation method according to any one of claims 1-6.

8. The application of the gasification slag / fly ash adsorption particles as described in claim 7 in the adsorption and removal of organic matter in water treatment.

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