Treatment method for mineralization and chlorine fixation of waste incineration fly ash and waste incineration fly ash solidified body

Abstract

The invention relates to the field of hazardous waste treatment, in particular to a treatment method for mineralization and chlorine fixation of waste incineration fly ash and a waste incineration fly ash solidified body. The treatment method comprises the following steps that S1, the incineration fly ash is subjected to homogenization treatment, and homogenized fly ash is obtained; s2, the homogenized fly ash is detoxified through plasma treatment, dioxin on the surface of the homogenized fly ash is removed, and detoxified fly ash is obtained; and S3, stirring the detoxified fly ash, a mineralizing agent and water, carrying out shock excitation, carrying out pouring molding, standing, and demolding to obtain the waste incineration fly ash solidified body. According to the method, the incineration fly ash is dispersed through homogenization treatment, dioxin on the surface of the homogenized fly ash is removed through plasma treatment, finally, fly ash particles are tightly wrapped and cemented through cooperation of a mineralizing agent and water, a compact network structure is formed, the leaching toxicity of heavy metal is reduced, soluble chloride ions are chemically fixed in crystal lattices of minerals, and the leaching efficiency is improved. The incineration fly ash mineralization and synergistic chlorine fixation effects are realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hazardous waste treatment, in particular to a waste incineration fly ash mineralization and chlorine fixation treatment method and a waste incineration fly ash solidified body. BACKGROUND

[0002] Waste incineration treatment is one of the important ways of current municipal waste treatment. With the acceleration of urbanization and the increasing amount of waste, waste incineration technology has been widely used and rapidly developed. Waste incineration not only can greatly reduce the volume of waste and reduce the pressure of waste landfill, but also can generate heat energy for power generation and other purposes to achieve a certain degree of resource recycling, which plays a positive role in improving urban environment and rational utilization of resources. However, due to the enrichment of heavy metals, dioxins and soluble chlorides, municipal waste incineration fly ash is included in the National Hazardous Waste List (2025 Edition) HW18 hazardous waste (code 772-002-18), and its safe disposal always faces the dual challenges of technology and economy.

[0003] At present, the common technical means for treating waste incineration fly ash are as follows: 1. High temperature incineration method, which decomposes harmful substances in fly ash through high temperature environment to reduce its toxicity; 2. Chemical stabilization method, which uses chemical reagents to react with harmful substances in fly ash to convert them into stable compounds. However, the above technical means still has many defects, and it is difficult to achieve the ideal mineralization and chlorine fixation effect of waste incineration fly ash. SUMMARY

[0004] In order to promote the mineralization and chlorine fixation effect of waste incineration fly ash, the present application provides a waste incineration fly ash mineralization and chlorine fixation treatment method and a waste incineration fly ash solidified body.

[0005] In the first aspect, the present application provides a waste incineration fly ash mineralization and chlorine fixation treatment method, which adopts the following technical scheme: A waste incineration fly ash mineralization and chlorine fixation treatment method, comprising the following steps: S1, homogenizing the incineration fly ash to obtain homogenized fly ash; S2, detoxifying the homogenized fly ash by plasma treatment to remove dioxins on the surface of the homogenized fly ash to obtain detoxified fly ash; S3, stirring, exciting and pouring the detoxified fly ash with a mineralizer and water to form a solidified body, and then demolding after standing to obtain a waste incineration fly ash solidified body.

[0006] By adopting the technical scheme, first, the components in the mixed incineration fly ash are homogenized and the agglomerated particles in the incineration fly ash are broken up, and a uniform suspension flow state is formed, then the dioxin on the surface of the homogenized fly ash is removed by plasma treatment, the toxic dioxin is decomposed into harmless small molecular substances such as CO2 and H2O, and the detoxification is realized from the molecular level, finally, the mineralizer and water are added, under the conditions of stirring and excitation, the mineralizer can react with the incineration fly ash to form a cementitious material such as pozzolanic reaction or hydrated calcium silicate gel under the excitation of water, and the gel can tightly wrap and cement the fly ash particles to form a dense network structure, which greatly reduces the leaching toxicity of heavy metals, at the same time, the mineralization process can also fix the soluble chloride ions in the crystal lattice of the mineral through chemical reactions such as the generation of Friedel's salt, so that the migration ability of the soluble chloride ions is lost, thereby realizing the effect of solidifying chloride and obtaining the harmless waste incineration fly ash solidification body, and realizing the effects of fly ash mineralization and synergistic solidification of chloride.

[0007] Preferably, the mineralizer includes the following components in parts by weight: cement 20-35 parts, medium sand 10-25 parts, silica fume 2-5 parts, chelating agent 0.5-2 parts, and water reducing agent 0.2-1 part.

[0008] By adopting the technical scheme, cement can be used as the main cementitious material to provide core components such as calcium aluminate and calcium silicate required for hydration reaction, and after hydration, C-S-H gel, calcium hydroxide and aluminum phase can be generated, wherein the C-S-H gel can wrap the detoxified fly ash, the calcium hydroxide can provide a high alkalinity environment to stabilize the heavy metals and excite the pozzolanic reaction of the active material, and the aluminum phase can react with chloride ions to generate Friedel's salt to realize chemical solidification of chloride.

[0009] The medium sand acts as an aggregate and a filler to support the framework.

[0010] The silica fume as a high-performance active admixture can fill the small pores between the cement particles, make the waste incineration fly ash solidification body more dense, and react with the calcium hydroxide generated by the hydration of cement to generate more C-S-H gel, and the extremely dense structure physically completely blocks the leaching channels of heavy metals and chloride ions.

[0011] The chelating agent forms stable chelates with heavy metals in the detoxified fly ash, and the physical wrapping of cement forms a double insurance to ensure that the heavy metals are difficult to leach out in any harsh environment.

[0012] The addition of the water reducing agent can efficiently disperse the particles, making the dry mixture easy to stir and pour, which helps to obtain a solidification body with higher density and higher strength.

[0013] Preferably, the mass ratio of the cement to the silica fume is 6-9:1.

[0014] By adopting the above technical scheme, when the proportion of cement is too small, the alkalinity of the system is insufficient, which causes the pozzolanic reaction of silica fume to be very slow or even unable to effectively proceed, and a high content of silica fume exacerbates the self-shrinkage and drying shrinkage of concrete, resulting in that the solidified body of waste incineration fly ash is prone to cracks, and the leaching concentration of heavy metals increases.

[0015] When the proportion of cement is too large, the pores between cement particles cannot be effectively filled by silica fume, resulting in a high porosity inside the solidified body, which provides a channel for the migration of moisture and harmful substances, increases the leaching risk of heavy metals and chloride ions, and when the addition amount of silica fume is insufficient, a large amount of calcium hydroxide generated by cement hydration cannot be consumed, resulting in a decrease in the compressive strength of the waste incineration fly ash.

[0016] Preferably, the chelating agent is disodium ethylenediaminetetraacetate.

[0017] By adopting the above technical scheme, disodium ethylenediaminetetraacetate can undergo a spectrum and efficient complexation reaction with various heavy metal ions in detoxified fly ash to form a stable water-insoluble chelate. Moreover, in the high alkalinity environment of cement, disodium ethylenediaminetetraacetate still has excellent saturation capacity and can stably fix heavy metals to reduce the leaching concentration of heavy metals.

[0018] Preferably, the water reducing agent is a polycarboxylate-based high-performance water reducing agent.

[0019] By adopting the above technical scheme, the polycarboxylate-based high-performance water reducing agent has excellent dispersing ability, which makes cement particles uniformly dispersed, hydration more complete, and active ingredients in detoxified fly ash more easily contact cement hydration products, thereby promoting the pozzolanic reaction; makes chloride ions more uniformly distributed in the system and more easily contact aluminum, which is conducive to the uniform generation of Friedel salt and the improvement of chlorine fixation efficiency.

[0020] Moreover, the main chain (polycarboxylic acid) and side chain (polyether) of the polycarboxylate-based high-performance water reducing agent are very stable in strong alkaline conditions and do not undergo hydrolysis or decomposition, which can continuously and stably play a dispersing and water-reducing role in the entire hydration process, ensuring the reliability of the system performance Preferably, the mineralizing agent further includes an internal curing agent, and the internal curing agent includes oil sludge, surface treatment sludge, incineration fly ash, aluminum ash, silico-alumina solid waste, and contaminated soil.

[0021] By adopting the technical scheme, the oil sludge and the surface treatment sludge in the internal curing agent contain a large amount of organic matters and combined ice, and form tiny "water reservoirs" in the interior of the solidified body. With the progress of the hydration reaction and the decrease of the internal humidity, the water is slowly released to continuously promote the hydration reaction of the un-hydrated cement particles, effectively compensates the volume shrinkage caused by the water consumption of the cement hydration and the self-drying effect, and greatly reduces the risk of cracking of the solidified body.

[0022] In addition, the aluminum dross and the silico-aluminous solid waste in the internal curing agent provide a large amount of active aluminum source and silicon source, the active aluminum is a necessary component for generating Friedel salt, which makes the solidification of chlorine more complete, and the active silicon source can participate in the pozzolanic reaction to generate more C-S-H gel, so that the network structure of the solidified body of the waste incineration fly ash is more developed and stable.

[0023] Preferably, the adding amount of the internal curing agent is 2-10 parts.

[0024] By adopting the technical scheme, when the adding amount of the internal curing agent is too small, the internal curing agent cannot form enough and uniformly distributed "water sources" in the system, cannot form an effective humidity network to compensate for the self-drying effect caused by the water consumption of the hydration, and leads to the generation of micro and macro cracks, so that the concentration of heavy metals increases.

[0025] When the adding amount of the internal curing agent is too large, the addition of excessive internal curing agent will relatively reduce the proportion of the core cementitious material such as cement, and the internal curing agent itself contains pollutants such as heavy metals, and the excessive adding amount may make the total amount of pollutants in the system exceed the limit of the physical packaging and chemical solidification capacity of the cementitious material such as cement. The leaching concentration of heavy metals increases.

[0026] Preferably, the mass ratio of the mineralizer, the detoxified fly ash and water is (45-70):(20-40):(10-15), and the total mass of the mineralizer, the detoxified fly ash and water is 100.

[0027] By adopting the technical scheme, a high proportion of the mineralizer can have enough active components to react with a low proportion of the detoxified fly ash to form cementitious products such as hydrated calcium silicate gel, which constitutes the high-strength skeleton of the fly ash solidified body, and a large amount of aluminum phase and calcium phase in the mineralizer are necessary conditions for generating chloro-fixation products such as Friedel salt, which can completely "lock" the high content of soluble chlorides in the fly ash to avoid precipitation and subsequent corrosion, leaching and other problems.

[0028] The low water-cement ratio can ensure that the obtained solidified body of the waste incineration fly ash has an ideal compressive strength, and reduce the pores left in the solidified body of the waste incineration fly ash after excessive water evaporates, forming a strong and dense solidified body structure.

[0029] In a second aspect, the application provides a waste incineration fly ash solidified body, which adopts the following technical scheme: A waste incineration fly ash solidified body is prepared by the waste incineration fly ash mineralization and synergistic chlorine fixation method of any one of claims 1-8.

[0030] In summary, the application has at least one of the following beneficial technical effects: 1. The application homogenizes the components in the mixed incineration fly ash and disperses the agglomerated particles in the incineration fly ash, then removes dioxins on the surface of the homogenized fly ash through plasma treatment, and finally adds a mineralizer and water. The mineralizer can react with the incineration fly ash to form pozzolanic reaction or form hydrated calcium silicate gel and other cementitious materials under the excitation of water. The fly ash particles are tightly wrapped and cemented to form a dense network structure, which greatly reduces the leaching toxicity of heavy metals. At the same time, the mineralization process can also chemically fix soluble chloride ions in the crystal lattice of the mineral through chemical reaction, so that it loses the ability to migrate, thereby achieving the effect of chlorine fixation, obtaining a harmless waste incineration fly ash solidified body, and realizing the effects of fly ash mineralization and synergistic chlorine fixation; 2. The application adds an internal curing agent to the mineralizer. The addition of the internal curing agent can form a small "water storage pool" inside the waste incineration fly ash solidified body. This stored water can act as an "internal water source" to promote cement hydration, effectively compensate for the volume shrinkage caused by water consumption and self-drying effect, greatly reduce the risk of cracking of the solidified body, and thus reduce the heavy metal leaching concentration; 3. The mass ratio of the mineralizer, detoxified fly ash, and water is (45-70):(20-40):(10-15), and the total mass of the mineralizer, detoxified fly ash, and water is 100. A high proportion of mineralizer can have enough active ingredients to react with a low proportion of detoxified fly ash to form hydrated calcium silicate gel and other cementitious products. A large amount of aluminum and calcium phases in the mineralizer can completely "lock" the high content of soluble chloride salts in the fly ash, avoiding their precipitation and subsequent corrosion, leaching, and other problems. A low water-cement ratio can ensure that the obtained waste incineration fly ash solidified body has an ideal compressive strength, and reduce the formation of pores in the waste incineration fly ash solidified body after excessive water evaporation, forming a strong and dense solidified body structure. DETAILED DESCRIPTION

[0031] The raw materials in the application include the following parts: Incineration fly ash: hazardous waste with the code HW18 from Beijing Chaoyang North Control Renewable Energy Technology Co., Ltd.; Cement: ordinary Portland cement available on the market, selected from the commercially available product with the product code hh73939478 from Suzhou Chengyi Bang Building Material Co., Ltd.; Medium sand: commercially available product from Shandong Xinminda Technology Development Co., Ltd. Silica ash: using the commercially available product of Gongyi Aodu Architectural Material Co., Ltd.; Disodium ethylenediaminetetraacetate: using the commercially available product with CAS No. 139-33-3; Polycarboxylate high-performance water-reducing agent: using the commercially available product with model number PC-1055 10226028 1058 of Shanghai Hengchuang Chemical Co., Ltd.; Oily sludge: using the hazardous waste with code HW08 of Fushun Petrochemical Branch Company of China Petroleum and Natural Gas Corporation Limited; Surface treatment sludge: using the hazardous waste with code HW17 of Fushun Hengtong Steel Tube Co., Ltd.; Aluminum ash: using the hazardous waste with code HW48 of Shenyang Lig Aluminum Co., Ltd.; Silico-aluminous solid waste: using the hazardous waste with code HW48 of Zhejiang Judong Co., Ltd.; Contaminated soil: using the hazardous waste with code HW49 of Zhongji Energyland (Hangzhou) Environmental Remediation Co., Ltd.

[0032] The application will be further described in detail in combination with examples and comparative examples.

[0033] Example 1 A treatment method for waste incineration fly ash mineralization and simultaneous chlorine fixation, comprising the following steps: S1, uniformly treating 3 kg of incineration fly ash to obtain homogenized fly ash; S2, conveying the homogenized fly ash to a dioxin detoxifier to detoxify the homogenized fly ash by plasma treatment, removing the dioxin on the surface of the homogenized fly ash, to obtain detoxified fly ash; S3, stirring and exciting the detoxified fly ash with a mineralizing agent and water at 30°C for 1 hour, then pouring and forming, demolding after 14 days of curing to obtain a waste incineration fly ash solidified body.

[0034] The mineralizing agent comprises the following components: cement 3 kg, medium sand 2.2 kg, silica ash 0.4 kg, disodium ethylenediaminetetraacetate 0.14 kg, and polycarboxylate high-performance water-reducing agent 0.06 kg. The mass ratio of cement to silica ash is 7.5:1. The mass ratio of the mineralizing agent, detoxified fly ash, and water is 58:30:12.

[0035] The preparation of the mineralizing agent comprises the following steps: Step 1: mixing the cement, medium sand, silica ash, disodium ethylenediaminetetraacetate, and polycarboxylate high-performance water-reducing agent according to the prescription and amount, and stirring uniformly to obtain the mineralizing agent.

[0036] Comparative Example 1 Comparative Example 1 is based on the preparation method of Example 1, and S1 is removed, i.e. the incineration fly ash is directly detoxified to obtain detoxified fly ash, and the remaining conditions are unchanged.

[0037] Performance detection test The waste incineration fly ash solidified body of Example 1 and Comparative Example 1 is analyzed, and the specific detection method is as follows: 1. Heavy metal leaching concentration The heavy metal leaching experiment of the waste incineration fly ash solidified body is carried out by using the "Solid waste leaching toxicity leaching method-acetic acid buffer solution method", and then the content of heavy metal ions (Pb, Ni, Cr, Cd, As) in the leaching solution is detected by using inductively coupled plasma emission spectrometer.

[0038] 2. Chlorine fixation rate The fly ash solidified body is crushed to 5mm and sieved, 50g of sieved sample is taken and soaked in 1L deionized water, the concentration of chloride ions in the soaking solution is tested by ion chromatography, and the chlorine fixation rate is obtained by comparing the chloride ion concentration of the original fly ash soaking solution.

[0039] According to the above detection method, the test results of Example 1 and Comparative Example 1 are obtained, as shown in Table 1 below.

[0040] Table 1 Performance detection table of Example 1 and Comparative Example 1 Referring to Table 1, it can be seen from the comparison of Example 1 and Comparative Example 1 that the performance of the waste incineration fly ash solidified body of Example 1 is the best, and the heavy metal leaching concentration in the fly ash treated by the method of the embodiment meets the standard GB16889 2008 for pollution control of domestic waste landfill, which may be because the homogenization treatment helps to uniformly disperse the components in the incineration fly ash and break up the agglomerated particles in the incineration fly ash, and the uniform fly ash matrix helps the hydration product to uniformly wrap and connect all particles to form a dense microstructure, thereby more effectively fixing the heavy metals and chloride ions in the network structure.

[0041] Example 2-3 Example 2-3 is based on the preparation method of Example 1, and the components of the mineralizer are adjusted, as shown in Table 2.

[0042] Comparative Example 2-4 Comparative Example 2-4 is based on the preparation method of Example 1, and the components of the mineralizer are adjusted, as shown in Table 2.

[0043] Table 2 Mineralizer component table of Example 1-3 and Comparative Example 2-4 The waste incineration fly ash mineralizer of Example 2-3 and Comparative Example 2-4 was subjected to the above performance test, and the test results are shown in Table 3.

[0044] Table 3 Performance test table of Example 1-3 and Comparative Example 2-4 Referring to Table 3, it can be seen from Comparative Example 1-3 and Comparative Example 2-4 that the addition of cement as the main cementitious material provides the core components such as calcium aluminate and calcium silicate required for the hydration reaction, and after hydration, C-S-H gel, calcium hydroxide and aluminum phase can be generated, among which the C-S-H gel can wrap the detoxified fly ash, the calcium hydroxide can provide a high alkalinity environment to stabilize the heavy metals and stimulate the pozzolanic reaction of the active material, and the aluminum phase can react with chloride ions to generate Friedel salt, achieving chemical chlorine fixation.

[0045] The presence of silica fume can make the waste incineration fly ash solidified body more compact, and can react with the calcium hydroxide generated by the hydration of cement to generate more C-S-H gel, and the extremely dense structure physically completely blocks the leaching channel of heavy metals and chloride ions.

[0046] The chelating agent targets the heavy metals in the detoxified fly ash and forms stable chelates with them, and the physical wrapping of cement forms a double insurance, ensuring that heavy metals are difficult to leach out under any harsh environment.

[0047] Through the cooperation between the above-mentioned substances, the effects of incineration fly ash mineralization and synergistic chlorine fixation are achieved.

[0048] Examples 4-7 Examples 4-7 adjust the mass ratio of cement to silica fume based on the preparation method of Example 1, and the specific adjustments are shown in Table 4.

[0049] The waste incineration fly ash solidified body of Example 4-7 was subjected to the above performance test, and the test results are shown in Table 4.

[0050] Table 4 Mass ratio of cement to silica fume and performance test table of Example 1 and Examples 4-7 Referring to Table 5, it can be seen from Comparative Example 1 and Examples 4-7 that when the mass ratio of cement to silica fume is 6-9:1, especially when the mass ratio of cement to silica fume is 7.5:1, the performance of the waste incineration fly ash solidified body is optimal, which may be because when the proportion of cement is too small, the alkalinity of the system is insufficient, resulting in that the pozzolanic reaction of silica fume is very slow or even cannot be effectively carried out, and a high content of silica fume will exacerbate the autogenous shrinkage and drying shrinkage of concrete, leading to cracks in the waste incineration fly ash solidified body, and the leaching concentration of heavy metals increases.

[0051] When the proportion of cement is too large, the pores between the cement particles cannot be effectively filled by silica fume, resulting in a high porosity inside the solidified body, which provides a channel for the migration of water and harmful substances, increasing the risk of leaching of heavy metals and chloride ions, and when the amount of silica fume is insufficient, the large amount of calcium hydroxide produced by cement hydration cannot be consumed, resulting in a decrease in the compressive strength of the waste incineration fly ash.

[0052] Example 8 Example 8 is based on the preparation method of Example 1, and 0.5 kg of internal curing agent is added in the preparation of the mineralizer. The internal curing agent includes 20% oil sludge, 3.5% surface treatment sludge, 27% incineration residue, 6% aluminum slag, and 14% contaminated soil.

[0053] Examples 9-12 Examples 9-12 are based on the preparation method of Example 8, and the amount of internal curing agent is adjusted, as shown in Table 6.

[0054] Table 6: Internal curing agent addition amount and performance test table of Example 1 and Examples 8-12 As shown in Table 6, by comparing Example 1 and Example 8, the addition of internal curing agent can form a small "water reservoir" inside the waste incineration fly ash solidified body. These stored water can act as an "internal water source" to promote cement hydration, effectively compensating for the volume shrinkage caused by water consumption and self-drying effect, greatly reducing the risk of cracking of the solidified body.

[0055] As shown in Table 6, by comparing Example 1 and Example 8, the addition of internal curing agent can form a small "water reservoir" inside the waste incineration fly ash solidified body. These stored water can act as an "internal water source" to promote cement hydration, effectively compensating for the volume shrinkage caused by water consumption and self-drying effect, greatly reducing the risk of cracking of the solidified body.

[0056] Examples 13-16 Examples 13-16 are based on the preparation method of Example 1, and the mass ratio of mineralizer, detoxified fly ash, and water is adjusted, as shown in Table 7.

[0057] The waste incineration fly ash solidified body of examples 13-16 was subjected to the above performance test, and the test results are shown in Table 7.

[0058] Table 7 Mass ratio of mineralizer, detoxification fly ash and water of examples 1 and examples 13-16 and performance test table As shown in Table 7, it can be seen from comparative example 1 and examples 13-16 that when the mass ratio of mineralizer, detoxification fly ash and water is (45-70):(20-40):(10-15), especially when the mass ratio of mineralizer, detoxification fly ash and water is 58:30:12, the performance of the obtained waste incineration fly ash solidified body is optimal, which may be because a high proportion of mineralizer can have sufficient active ingredients to react with a low proportion of detoxification fly ash to form hydrated calcium silicate gel and other cementitious products, forming a high-strength skeleton of the fly ash solidified body, and a large amount of aluminum phase and calcium phase in the mineralizer is a necessary condition for the formation of Friedel salt and other chlorine fixation products, which can completely "lock" the high content of soluble chloride salt in the fly ash, avoiding its precipitation and causing subsequent corrosion, leaching and other problems. Low water-cement ratio can ensure that the obtained waste incineration fly ash solidified body has ideal compressive strength, and reduce the excessive water content in the waste incineration fly ash solidified body after evaporation, forming a strong and dense solidified body structure.

[0059] The specific embodiments are only an explanation of the present application, which is not a limitation of the present application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A method for treating waste incineration fly ash mineralization and synergistic chlorine fixation, characterized in that, The method comprises the following steps: S1, homogenizing the incineration fly ash to obtain homogenized fly ash; S2, detoxifying the homogenized fly ash by plasma treatment to remove dioxins on the surface of the homogenized fly ash, and obtaining detoxified fly ash; S3, stirring, exciting and pouring the detoxified fly ash, mineralizer and water to form a solidified body of waste incineration fly ash.

2. The method according to claim 1, characterized in that, The mineralizer comprises the following components in parts by weight: cement 20-35 parts, medium sand 10-25 parts, silica fume 2-5 parts, chelating agent 0.5-2 parts, and water reducing agent 0.2-1 part.

3. The method according to claim 2, characterized in that, The mass ratio of the cement to the silica fume is 6-9:

1.

4. The method according to claim 2, characterized in that, The chelating agent is disodium ethylenediaminetetraacetate.

5. The method according to claim 2, wherein the method is characterized by, The water reducing agent is a polycarboxylic acid high-performance water reducing agent.

6. The method according to claim 2, wherein the method is characterized by, The mineralizer further comprises an internal curing agent, and the internal curing agent comprises oil sludge, surface treatment sludge, incineration fly ash, aluminum ash, silico-aluminous solid waste and contaminated soil.

7. The method according to claim 6, characterized in that, The internal curing agent is added in an amount of 2-10 parts.

8. The method according to claim 1, characterized in that, The mass ratio of the mineralizer, the detoxified fly ash and the water is (45-70):(20-40):(10-15), and the total mass of the mineralizer, the detoxified fly ash and the water is 100.

9. A solidified body of waste incineration fly ash, characterized by, A solidified body of waste incineration fly ash prepared by the method of any one of claims 1-8.

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