Method for preparing high-water-absorption adsorption material and mineral composite modified sludge gasification slag

Abstract

The invention relates to the technical field of adsorption materials, in particular to a method for preparing a high-water-absorption adsorption material and mineral composite modified sludge gasification slag. The method comprises the following steps: S1, crushing and grinding the sludge gasification slag to obtain gasification slag powder; the preparation method comprises the following steps: crushing and grinding bentonite raw ore to obtain bentonite powder; s2, physically mixing the bentonite powder obtained in the step S1 with gasified slag powder, and uniformly stirring in mixing equipment to obtain a mixed dry material; s3, sodium carbonate serving as a sodium modifying agent is added into the mixed dry material obtained in the step S2, a kneading reaction is performed through a kneading machine, and a proper amount of water is sprayed in the kneading process to promote the sodium modifying reaction; and S4, gradually heating and drying the sodium modified product obtained in the step S3 to constant weight, and crushing, grinding and sieving the obtained dried material to obtain the high-water-absorption composite adsorption material. The mineral composite modified sludge gasification slag adsorbing material prepared by the invention shows extremely high water absorption rate.

Description

Technical Field

[0001] This invention relates to the field of adsorption materials technology, and in particular to a method for preparing a high water absorption adsorption material and mineral composite modified sludge gasification slag. Background Technology

[0002] With the acceleration of urbanization and the improvement of sewage treatment rates, my country's sludge production continues to grow. Sludge gasification technology, as an effective means of volume reduction and energy recovery, is increasingly widely used. However, the gasification process generates a large amount of solid residue—sludge gasification slag—whose disposal has become a new environmental challenge. Traditional disposal methods mainly rely on landfill, which not only occupies land resources but also poses a potential pollution risk to soil and groundwater due to heavy metals and salts that may leach from the gasification slag. Achieving efficient and high-value-added resource utilization of sludge gasification slag is a key link in promoting the sustainable development of sludge treatment systems and has significant environmental and economic implications.

[0003] Superabsorbent materials (SAPs) are functional materials capable of absorbing and retaining several times their own weight in water, and are widely used in agricultural water retention, hygiene products, landscaping, and engineering seepage prevention. Currently, commercially available SAPs are mainly based on synthetic polymers (such as sodium polyacrylate). While they offer excellent water absorption, their raw materials rely on fossil fuels, resulting in high costs, poor biodegradability, and potential environmental impact during production. Therefore, developing low-cost, environmentally friendly new SAPs has become a research hotspot.

[0004] Sludge gasification slag is typically rich in inorganic components such as SiO2, Al2O3, and CaO, possessing a certain porous structure and specific surface area, making it a potential substrate for adsorption materials. However, its water absorption capacity is limited, resulting in low direct utilization efficiency, necessitating physical or chemical modification to improve its performance. Developing highly absorbent materials using gasification slag as the main raw material could reduce material costs and provide a new pathway for solid waste resource utilization, achieving "waste treatment with waste." Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a method for preparing a high-water-absorption adsorbent material and mineral-modified sludge gasification slag. Through optimized formulation and sodium-based kneading process, a novel adsorbent material with high water absorption, good stability, and low cost is prepared. This method not only opens up new avenues for the resource utilization of sludge gasification slag but also provides technical support for the green manufacturing of high-performance mineral-based water-absorbent materials, demonstrating significant environmental benefits and application prospects.

[0006] The first objective of this invention is to provide a method for preparing high water absorption adsorbent materials from mineral composite modified sludge gasification slag, comprising the following steps: S1. Crush and grind the sludge gasification slag to obtain gasification slag powder; crush and grind the raw bentonite ore to obtain bentonite powder. S2. Physically mix the bentonite powder obtained in step S1 with the gasification slag powder, and stir evenly in a mixing device to obtain a mixed dry material. S3. Add sodium carbonate as a sodium-forming agent to the mixed dry material obtained in step S2, and knead it through a kneader. During the kneading process, spray an appropriate amount of water to promote the sodium-forming reaction. S4. The sodium-modified product obtained in step S3 is dried to constant weight by gradually increasing the temperature. The dried material is then crushed, ground, and sieved to obtain a high water absorption composite adsorbent material.

[0007] Further, in step S2, the mass ratio of the bentonite powder to the gasification slag powder is (7~9): (1~3).

[0008] Furthermore, in step S3, the amount of sodium carbonate added as the sodium carbonate agent accounts for 2% to 8% of the total mass of the mixed dry material.

[0009] Furthermore, in step S3, the kneading reaction takes 0.5 to 1 hour.

[0010] Furthermore, in step S3, the amount of water added is 20% to 40% of the total mass of the mixed dry materials.

[0011] Furthermore, in step S4, the conditions for the gradual heating and drying are as follows: first, pre-dry at 60~80℃ for 1~2 hours, and then dry at 100~120℃ to constant weight.

[0012] Furthermore, in step S4, the sieving is performed using a standard sieve with a particle size range of 0.5~2 mm.

[0013] A second objective of this invention is to provide an adsorbent material with high water absorption rate prepared by the method described above.

[0014] The bentonite used in this invention is considered an ideal natural water-absorbing component due to its layered structure, cation exchange capacity, and hydrophilicity. The montmorillonite mineral layers in bentonite can accommodate a large number of water molecules, and its water absorption and swelling properties are significantly improved after sodium modification. Utilizing the excellent water absorption and swelling properties and cation exchange characteristics of bentonite, sodium modification and compounding with sludge gasification slag can compensate for the insufficient water absorption performance of the gasification slag, significantly improving the material's water absorption capacity. Simultaneously, the gasification slag can act as a framework material to inhibit excessive swelling of the bentonite; the two have complementary potential in terms of structure and function. Through appropriate modification processes (such as sodium kneading), the interfacial bonding between the two can be promoted, a stable pore structure can be constructed, synergistic effects can be achieved, the limitations of single-material performance can be overcome, and high-value utilization of solid waste can be realized.

[0015] The key technical point of this invention is: (1) The sludge gasification residue is rich in inorganic silicon and aluminum components and has a porous skeleton structure, which can be used as a supporting matrix to effectively suppress the excessive swelling of bentonite after it comes into contact with water. Bentonite has a layered structure and cation exchange capacity, providing the main water absorption and swelling properties. The two have significant complementary potential in terms of structure and function, laying the foundation for building composite materials that combine stability and high water absorption.

[0016] (2) Through the sodium modification process, soda ash is used as a sodium modifier and mechanical chemical activation is achieved during the kneading process. Sodium ions replace calcium ions in the bentonite interlayer, which can significantly enhance the water absorption and swelling performance of bentonite. The kneading effect promotes the interfacial bonding between bentonite sheets and gasification slag particles, and constructs a stable pore structure, thereby achieving efficient adsorption of water.

[0017] (3) Sodium kneading process not only realizes the ion exchange and transformation of bentonite, but more importantly, through the synergy of mechanical and chemical action, it enables the two types of solid waste to form a composite system at the micro level, breaking through the performance limitations of single materials in terms of water absorption rate, stability and cost, and finally obtaining a high-performance water-absorbing material with synergistic effect.

[0018] Effects of implementing the present invention (1) Significantly improved product performance: The mineral composite modified sludge gasification slag adsorbent material prepared by this invention exhibits extremely high water absorption rate. Its water absorption rate can be optimized and controlled by the raw material ratio and process parameters, and can generally reach 3-5 times its own weight, which is far superior to the unmodified original sludge gasification slag, fully demonstrating the synergistic effect of bentonite and gasification slag composite ("1+1>2" effect).

[0019] (2) Enhanced product stability and applicability: Thanks to the support of the porous skeleton of gasification slag, the disadvantage of simple bentonite material being prone to excessive swelling is overcome, giving it a longer service life and better reliability in actual application environments (such as soil, packaging materials, etc.).

[0020] (3) The cost of raw materials is greatly reduced: This invention uses sludge gasification residue and natural bentonite as the main raw materials. The raw materials are widely available and inexpensive, which completely changes the traditional situation of super absorbent materials relying on petroleum-based chemical raw materials. The production cost can be significantly reduced, and it has extremely high economic efficiency and market competitiveness.

[0021] (4) Simple and green process: The preparation method does not require high-temperature calcination or complex chemical reaction process. The conditions are mild, the operation is simple, the energy consumption is low, and the whole process does not produce secondary pollution. It meets the requirements of green environmental protection and sustainable development and is easy to realize large-scale industrial production.

[0022] (5) Outstanding value of solid waste resource utilization: This invention opens up a new way for the high added value and resource utilization of sludge gasification residue, effectively solves the environmental risks brought about by its stockpiling and disposal, and achieves the goal of "treating waste with waste and turning waste into treasure", with significant environmental and social benefits. Attached Figure Description

[0023] Figure 1 X-ray diffraction patterns of the composite adsorbents prepared in Comparative Example 1 (pure sludge gasification residue), Comparative Example 2 (pure bentonite), and Example 1 (composite material); Figure 2 A bar chart comparing the water absorption rates of the composite adsorbents prepared in Comparative Example 1 (pure sludge gasification residue), Comparative Example 2 (pure bentonite), and Example 1 (composite material); Figure 3 This is a process flow diagram for preparing high water absorption adsorbent material from mineral composite modified sludge gasification slag according to the present invention. Figure 4 The effect of different bentonite to sludge gasification slag mass ratios (10:0, 9:1, 8:2, 7:3, 6:4, 0:10) on the water absorption rate of composite materials was investigated. Figure 5 The effect of different amounts of soda ash (0, 2%, 4%, 6%, 8%) on the water absorption rate of composite materials; Figure 6 The effect of different kneading times (15 min, 30 min, 45 min, 60 min) on the water absorption rate of the composite material was investigated. Detailed Implementation

[0024] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0025] Example 1: (1) Take 20 parts of dried sludge gasification residue and grind it to obtain gasification residue powder; take 80 parts of calcium-based bentonite and grind it to obtain bentonite powder.

[0026] (2) Put the above gasification slag powder and bentonite powder into a mixer and mix for 30 minutes until uniform.

[0027] (3) Add 4 parts of soda ash (4% of the total mass of dry materials) to the mixed dry materials, transfer to a kneader, slowly spray 20 parts of water (20% of the total mass of dry materials), and knead for 30 minutes at room temperature.

[0028] (4) The kneaded product is dried at 60°C for 4 hours, and then dried in an oven at 110°C until constant weight. The dried block material is crushed and ground, and passed through a 10-mesh sieve (approximately 2 mm in diameter) and a 35-mesh sieve (approximately 0.5 mm in diameter). The intermediate particle size product is collected to obtain composite adsorbent material A1.

[0029] Example 2: (1) Take 10 parts of dried sludge gasification residue and grind it to obtain gasification residue powder; take 90 parts of calcium-based bentonite and grind it to obtain bentonite powder.

[0030] (2) Put the above gasification slag powder and bentonite powder into a mixer and mix for 30 minutes until uniform.

[0031] (3) Add 4 parts of soda ash (4% of the total mass of dry materials) to the mixed dry materials, transfer to a kneader, slowly spray 20 parts of water (20% of the total mass of dry materials), and knead for 30 minutes at room temperature.

[0032] (4) The kneaded product is dried at 60°C for 4 hours, and then dried in an oven at 110°C until constant weight. The dried block material is crushed and ground, and passed through a 10-mesh sieve (approximately 2 mm in diameter) and a 35-mesh sieve (approximately 0.5 mm in diameter). The intermediate particle size product is collected to obtain composite adsorbent material A2.

[0033] Example 3: (1) Take 30 parts of dried sludge gasification residue and grind it to obtain gasification residue powder; take 70 parts of calcium-based bentonite and grind it to obtain bentonite powder.

[0034] (2) Put the above gasification slag powder and bentonite powder into a mixer and mix for 30 minutes until uniform.

[0035] (3) Add 4 parts of soda ash (4% of the total mass of dry materials) to the mixed dry materials, transfer to a kneader, slowly spray 20 parts of water (20% of the total mass of dry materials), and knead for 30 minutes at room temperature.

[0036] (4) The kneaded product is dried at 60°C for 4 hours, and then dried in an oven at 110°C until constant weight. The dried block material is crushed and ground, and passed through a 10-mesh sieve (approximately 2 mm in diameter) and a 35-mesh sieve (approximately 0.5 mm in diameter). The intermediate particle size product is collected to obtain composite adsorbent material A3.

[0037] Example 4: (1) Take 40 parts of dried sludge gasification residue and grind it to obtain gasification residue powder; take 60 parts of calcium-based bentonite and grind it to obtain bentonite powder.

[0038] (2) Put the above gasification slag powder and bentonite powder into a mixer and mix for 30 minutes until uniform.

[0039] (3) Add 4 parts of soda ash (4% of the total mass of dry materials) to the mixed dry materials, transfer to a kneader, slowly spray 20 parts of water (20% of the total mass of dry materials), and knead for 30 minutes at room temperature.

[0040] (4) The kneaded product is dried at 60°C for 4 hours, and then dried in an oven at 110°C until constant weight. The dried block material is crushed and ground, and passed through a 10-mesh sieve (approximately 2 mm in diameter) and a 35-mesh sieve (approximately 0.5 mm in diameter). The intermediate particle size product is collected to obtain composite adsorbent material A4.

[0041] Comparative Example 1: (1) Take 0 parts of dried sludge gasification residue and grind it to obtain gasification residue powder; take 100 parts of calcium-based bentonite and grind it to obtain bentonite powder.

[0042] (2) Put the above gasification slag powder and bentonite powder into a mixer and mix for 30 minutes until uniform.

[0043] (3) Add 4 parts of soda ash (4% of the total mass of dry materials) to the mixed dry materials, transfer to a kneader, slowly spray 20 parts of water (20% of the total mass of dry materials), and knead for 30 minutes at room temperature.

[0044] (4) The kneaded product is dried at 60°C for 4 hours, and then dried in an oven at 110°C until constant weight. The dried block material is crushed and ground, and passed through a 10-mesh sieve (approximately 2 mm in diameter) and a 35-mesh sieve (approximately 0.5 mm in diameter). The intermediate particle size product is collected to obtain composite adsorbent material A5.

[0045] Comparative Example 2: (1) Take 100 parts of dried sludge gasification residue and grind it to obtain gasification residue powder; take 0 parts of calcium-based bentonite and grind it to obtain bentonite powder.

[0046] (2) Put the above gasification slag powder and bentonite powder into a mixer and mix for 30 minutes until uniform.

[0047] (3) Add 4 parts of soda ash (4% of the total mass of dry materials) to the mixed dry materials, transfer to a kneader, slowly spray 20 parts of water (20% of the total mass of dry materials), and knead for 30 minutes at room temperature.

[0048] (4) The kneaded product is dried at 60°C for 4 hours, and then dried in an oven at 110°C until constant weight. The dried block material is crushed and ground, and passed through a 10-mesh sieve (approximately 2 mm in diameter) and a 35-mesh sieve (approximately 0.5 mm in diameter). The intermediate particle size product is collected to obtain composite adsorbent material A6.

[0049] Example 5: (1) Take 20 parts of dried sludge gasification residue and grind it to obtain gasification residue powder; take 80 parts of calcium-based bentonite and grind it to obtain bentonite powder.

[0050] (2) Put the above gasification slag powder and bentonite powder into a mixer and mix for 30 minutes until uniform.

[0051] (3) Add 0 parts of soda ash (0% of the total mass of dry materials) to the mixed dry materials, transfer to a kneader, slowly spray 20 parts of water (20% of the total mass of dry materials), and knead for 30 minutes at room temperature.

[0052] (4) The kneaded product is dried at 60°C for 4 hours, and then dried in an oven at 110°C until constant weight. The dried block material is crushed and ground, and passed through a 10-mesh sieve (approximately 2 mm in diameter) and a 35-mesh sieve (approximately 0.5 mm in diameter). The intermediate particle size product is collected to obtain composite adsorbent material B1.

[0053] Example 6: (1) Take 20 parts of dried sludge gasification residue and grind it to obtain gasification residue powder; take 80 parts of calcium-based bentonite and grind it to obtain bentonite powder.

[0054] (2) Put the above gasification slag powder and bentonite powder into a mixer and mix for 30 minutes until uniform.

[0055] (3) Add 2 parts of soda ash (2% of the total mass of dry materials) to the mixed dry materials, transfer to a kneader, slowly spray 20 parts of water (20% of the total mass of dry materials), and knead for 30 minutes at room temperature.

[0056] (4) The kneaded product is first dried at 60°C for 4 hours, and then dried in an oven at 110°C until constant weight. The dried block material is crushed and ground, and passed through a 10-mesh sieve (approximately 2 mm in diameter) and a 35-mesh sieve (approximately 0.5 mm in diameter). The intermediate particle size product is collected to obtain composite adsorbent material B2.

[0057] Example 7: (1) Take 20 parts of dried sludge gasification residue and grind it to obtain gasification residue powder; take 80 parts of calcium-based bentonite and grind it to obtain bentonite powder.

[0058] (2) Put the above gasification slag powder and bentonite powder into a mixer and mix for 30 minutes until uniform.

[0059] (3) Add 6 parts of soda ash (6% of the total mass of dry materials) to the mixed dry materials, transfer to a kneader, slowly spray 20 parts of water (20% of the total mass of dry materials), and knead for 30 minutes at room temperature.

[0060] (4) The kneaded product is dried at 60°C for 4 hours, and then dried in an oven at 110°C until constant weight. The dried block material is crushed and ground, and passed through a 10-mesh sieve (approximately 2 mm in diameter) and a 35-mesh sieve (approximately 0.5 mm in diameter). The intermediate particle size product is collected to obtain composite adsorbent material B3.

[0061] Example 8: (1) Take 20 parts of dried sludge gasification residue and grind it to obtain gasification residue powder; take 80 parts of calcium-based bentonite and grind it to obtain bentonite powder.

[0062] (2) Put the above gasification slag powder and bentonite powder into a mixer and mix for 30 minutes until uniform.

[0063] (3) Add 8 parts of soda ash (8% of the total mass of dry materials) to the mixed dry materials, transfer to a kneader, slowly spray 20 parts of water (20% of the total mass of dry materials), and knead for 30 minutes at room temperature.

[0064] (4) The kneaded product is first dried at 60°C for 4 hours, and then dried in an oven at 110°C until constant weight. The dried block material is crushed and ground, and passed through a 10-mesh sieve (approximately 2 mm in diameter) and a 35-mesh sieve (approximately 0.5 mm in diameter). The intermediate particle size product is collected to obtain composite adsorbent material B4.

[0065] Example 9: (1) Take 20 parts of dried sludge gasification residue and grind it to obtain gasification residue powder; take 80 parts of calcium-based bentonite and grind it to obtain bentonite powder.

[0066] (2) Put the above gasification slag powder and bentonite powder into a mixer and mix for 30 minutes until uniform.

[0067] (3) Add 4 parts of soda ash (4% of the total mass of dry materials) to the mixed dry materials, transfer to a kneader, slowly spray 20 parts of water (20% of the total mass of dry materials), and knead for 15 minutes at room temperature.

[0068] (4) The kneaded product is dried at 60°C for 4 hours, and then dried in an oven at 110°C until constant weight. The dried block material is crushed, ground, and passed through a 10-mesh sieve (approximately 2 mm in diameter) and a 35-mesh sieve (approximately 0.5 mm in diameter). The intermediate particle size product is collected to obtain the composite adsorbent material C1.

[0069] Example 10: (1) Take 20 parts of dried sludge gasification residue and grind it to obtain gasification residue powder; take 80 parts of calcium-based bentonite and grind it to obtain bentonite powder.

[0070] (2) Put the above gasification slag powder and bentonite powder into a mixer and mix for 30 minutes until uniform.

[0071] (3) Add 4 parts of soda ash (4% of the total mass of dry materials) to the mixed dry materials, transfer to a kneader, slowly spray 20 parts of water (20% of the total mass of dry materials), and knead for 45 minutes at room temperature.

[0072] (4) The kneaded product is dried at 60°C for 4 hours, and then dried in an oven at 110°C until constant weight. The dried block material is crushed and ground, and passed through a 10-mesh sieve (approximately 2 mm in diameter) and a 35-mesh sieve (approximately 0.5 mm in diameter). The intermediate particle size product is collected to obtain composite adsorbent material C2.

[0073] Example 11: (1) Take 20 parts of dried sludge gasification residue and grind it to obtain gasification residue powder; take 80 parts of calcium-based bentonite and grind it to obtain bentonite powder.

[0074] (2) Put the above gasification slag powder and bentonite powder into a mixer and mix for 30 minutes until uniform.

[0075] (3) Add 4 parts of soda ash (4% of the total mass of dry materials) to the mixed dry materials, transfer to a kneader, slowly spray 20 parts of water (20% of the total mass of dry materials), and knead for 60 minutes at room temperature.

[0076] (4) The kneaded product is dried at 60°C for 4 hours, and then dried in an oven at 110°C until constant weight. The dried block material is crushed and ground, and passed through a 10-mesh sieve (approximately 2 mm in diameter) and a 35-mesh sieve (approximately 0.5 mm in diameter). The intermediate particle size product is collected to obtain composite adsorbent material C3.

[0077] Performance comparison analysis: Figure 1 X-ray diffraction patterns of the composite adsorbents prepared in Comparative Example 1 (pure sludge gasification slag), Comparative Example 2 (pure bentonite), and Example 1 (composite material); from Figure 1 It can be seen that the composite adsorbent material is prepared by physical mixing of sludge gasification residue and bentonite. No chemical reaction is involved in the preparation process of the composite adsorbent material. The sludge gasification residue and bentonite are mainly mixed together by mechanical force.

[0078] Figure 2 A bar chart comparing the water absorption rates of the composite adsorbents prepared in Comparative Example 1 (pure sludge gasification residue), Comparative Example 2 (pure bentonite), and Example 1 (composite material); Figure 3 This is a process flow diagram for preparing high water absorption adsorbent material from mineral composite modified sludge gasification slag according to the present invention. Figure 4 The effect of different bentonite to sludge gasification slag mass ratios (10:0, 9:1, 8:2, 7:3, 6:4, 0:10) on the water absorption rate of composite materials was investigated. Figure 5 The effect of different amounts of soda ash (0, 2%, 4%, 6%, 8%) on the water absorption rate of composite materials; Figure 6 The effect of different kneading times (15 min, 30 min, 45 min, 60 min) on the water absorption rate of the composite material was investigated.

[0079] The performance results of the above embodiments and comparative examples are summarized in Table 1 below: Table 1. Water absorption rates of the composite adsorbent materials prepared in Examples 1-11 and Comparative Examples 1-2

[0080] Depend on Figures 2-6 As shown in Table 1, when bentonite and sludge gasification residue are combined in a mass ratio of 8:2, the amount of sodium-modifying agent soda ash added is 4%~6%, and the kneading time is 45~60 min, the water absorption rate of the prepared composite material can reach up to 420%, which is significantly higher than that of the single component (pure bentonite 350%, pure sludge gasification residue 77%) and the comparative samples without sodium modification (B1, 80%) or short-time kneading (C1, 270%). This shows that the sodium modification and kneading modification achieves synergistic effect ("1+1>2") between bentonite and sludge gasification residue in terms of structure and function. The process of this invention improves the water absorption performance of the composite adsorbent material, which fully demonstrates the inventiveness and technical advantages of this invention.

[0081] For any points not covered above, existing technologies shall apply.

[0082] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the invention. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the direction of the invention or exceeding the scope defined by the appended claims. Those skilled in the art should understand that any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing high water absorption adsorbent material from mineral composite modified sludge gasification slag, characterized in that, Includes the following steps: S1. Crush and grind the sludge gasification slag to obtain gasification slag powder; crush and grind the raw bentonite ore to obtain bentonite powder. S2. Physically mix the bentonite powder obtained in step S1 with the gasification slag powder, and stir evenly in a mixing device to obtain a mixed dry material. S3. Add sodium carbonate as a sodium-forming agent to the mixed dry material obtained in step S2, and knead it through a kneader. During the kneading process, spray an appropriate amount of water to promote the sodium-forming reaction. S4. The sodium-modified product obtained in step S3 is dried to constant weight by gradually increasing the temperature. The dried material is then crushed, ground, and sieved to obtain a high water absorption composite adsorbent material.

2. The method for preparing high water absorption adsorbent material from mineral composite modified sludge gasification slag as described in claim 1, characterized in that, In step S2, the mass ratio of bentonite powder to gasification slag powder is (7~9): (1~3).

3. The method for preparing high water absorption adsorbent material from mineral composite modified sludge gasification slag as described in claim 1, characterized in that, In step S3, the amount of sodium carbonate added as the sodium alkali agent accounts for 2% to 8% of the total mass of the mixed dry material.

4. The method for preparing high water absorption adsorbent material from mineral composite modified sludge gasification slag as described in claim 1, characterized in that, In step S3, the kneading reaction takes 0.5 to 1 hour.

5. The method for preparing high water absorption adsorbent material from mineral composite modified sludge gasification slag as described in claim 1, characterized in that, In step S3, the amount of water added is 20% to 40% of the total mass of the mixed dry materials.

6. The method for preparing high water absorption adsorbent material from mineral composite modified sludge gasification slag as described in claim 1, characterized in that, In step S4, the conditions for the gradual heating and drying are as follows: first, pre-dry at 60~80℃ for 1~2 hours, and then dry at 100~120℃ to constant weight.

7. The method for preparing high water absorption adsorbent material from mineral composite modified sludge gasification slag as described in claim 1, characterized in that, In step S4, the sieving is performed using a standard sieve with a particle size range of 0.5~2 mm.

8. A high water absorption adsorbent material prepared by the method according to any one of claims 1-7.

Images