A kind of toxic element migration blocking shielding material for garbage fly ash and preparation method thereof

Abstract

The present invention discloses a toxic element migration blocking shielding material for garbage fly ash, which comprises the following components by mass: a blocking material, a shielding material, an electrostatic conductor material, an element desorption material, a fixedly attached powdery substrate, an attachment promoting material, a desorption catalyst, a cross-linking agent, and a dispersant. The present invention also discloses a preparation method of the shielding material, and the steps in the preparation method have a strict sequence and parameters. Improper preparation and application methods cannot achieve the effective blocking and shielding effect of the invention on the toxic elements in garbage fly ash. The toxic element migration blocking shielding material for garbage fly ash involved in the present invention can effectively desorb and shield the toxic elements in garbage fly ash, effectively inhibit the migration of toxic elements through electrostatic adsorption, directional attachment and shielding effects, ensure the environmental protection of garbage fly ash in the process of resource utilization, and promote the application of garbage fly ash as a filler in building cementitious materials.

Description

Technical Field

[0001] The invention belongs to the technical field of waste resource utilization, and specifically relates to a garbage fly ash toxic element migration blocking shielding material and a preparation method and application thereof. Background Art

[0002] With the rapid development of my country's economy and urbanization, the scale of cities and the number of population have continued to expand, which has directly led to a sharp increase in the amount of urban domestic waste. Due to the limitations of disposal methods, some cities have been directly surrounded by garbage. In recent years, the incineration of urban garbage, as the main core technology for harmless disposal, can not only achieve waste incineration power generation, but also effectively achieve the reduction and harmless disposal of garbage, which is of great significance for my country's environmentally friendly waste disposal. The harmless disposal of garbage incineration can reduce the amount of urban garbage in different forms through incineration. The products after incineration mainly include garbage fly ash and garbage bottom ash. Among them, garbage fly ash presents powdery characteristics, uniform particle size composition, and huge dosage. Since the particle size composition of garbage fly ash is similar to that of mineral powder filler in existing road projects, the resource utilization of garbage fly ash in road projects has become the key to solving the problem of terminal disposal of garbage fly ash. However, there are different types of heavy metal toxic elements in waste incineration fly ash. When used in road engineering materials, if the migration of toxic elements in waste fly ash cannot be effectively restricted, it may cause the toxic elements to continue to migrate downward with the segregation of waste fly ash, which may pollute groundwater resources in serious cases. Therefore, effectively controlling and shielding the migration of toxic elements in waste fly ash in road engineering materials is crucial for the resource utilization of waste incineration fly ash. Summary of the invention

[0003] The purpose of the present invention is to provide a garbage fly ash toxic element migration blocking shielding material and application thereof, so as to solve the problems in the prior art.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A garbage fly ash toxic element migration blocking shielding material, characterized in that it includes the following components, measured by mass: 100 parts of blocking material, 10-20 parts of shielding material, 3-6 parts of electrostatic conductor material, 2-4 parts of element desorption material, 20-50 parts of fixed attachment powdery substrate, 4-8 parts of attachment promoting material, 1-3 parts of desorption catalyst, 2-3 parts of cross-linking agent, and 1-2 parts of dispersant.

[0006] As a preferred technical solution, the garbage fly ash toxic element migration blocking shielding material is characterized in that it includes the following components, measured by mass: 100 parts of blocking material, 13-17 parts of shielding material, 4-5 parts of electrostatic conductor material, 2.5-3.5 parts of element desorption material, 30-40 parts of fixed attachment powdery substrate, 5-7 parts of attachment promoting material, 1.5-2.5 parts of desorption catalyst, 2.3-2.7 parts of cross-linking agent, and 1.4-1.7 parts of dispersant.

[0007] Further preferably, the fly ash toxic element migration blocking shielding material is characterized in that it includes the following components, by mass: 100 parts of blocking material, 15 parts of shielding material, 4.6 parts of electrostatic conductor material, 3 parts of element desorption material, 35 parts of fixed attachment powdery substrate, 6 parts of attachment promoting material, 2 parts of desorption catalyst, 2.5 parts of cross-linking agent, and 1.6 parts of dispersant.

[0008] As a preferred technical solution, the blocking material is any one or more of carbomer resin, propylene glycol alginate, styrene-isoprene-styrene, and cellulose hydroxyethyl ether, wherein the carboxylic acid group content of carbomer resin is in the range of 60%-64%, the esterification degree of propylene glycol alginate is ≥85.0, the styrene-isoprene-styrene block ratio is ≥2, and the molar substitution degree of cellulose hydroxyethyl ether is in the range of 1.8-1.9.

[0009] As a preferred technical solution, the shielding material is any one or more of polystyrene sulfonic acid or sodium p-styrene sulfonate, wherein the solid content of polystyrene sulfonic acid is 25%-37%, and the vinyl activity of sodium p-styrene sulfonate is greater than 92%.

[0010] As a preferred technical solution, the electrostatic conductor material is any one or more of polyethylene terephthalate, polycarbonate or polyvinyl butyral, wherein the dielectric constant of polycarbonate is in the range of 3.0-3.2, and the acetalization degree of polyvinyl butyral is in the range of 72%-84%.

[0011] As a preferred technical solution, the element desorption material is any one or more of chitin or hydroxyproline, and the fixed attachment powdery substrate is any one or more of limestone powder, halloysite powder or polyacrylamide, wherein the particle size of limestone powder and halloysite powder should be less than 0.6 mm, the plasticity index should be less than 4, the polyacrylamide should be anionic, and the degree of hydrolysis should be in the range of 20%-24%.

[0012] As a preferred technical solution, the adhesion promoting material is any one or more of aluminum hypophosphite or antimony trioxide, wherein the phosphorus content of aluminum hypophosphite is greater than 45%, and the refractive index of antimony trioxide is in the range of 2.137 to 2.264; the desorption catalyst is any one or more of activated alumina or polyaluminum sulfate, and the specific surface area of ​​activated alumina is in the range of 280m 2 / g-360m 2 / g, the basicity range of polyaluminium sulfate is 25%-35%.

[0013] As a preferred technical solution, the cross-linking agent is polycaprolactone, wherein the acid value of polycaprolactone is less than 1.0KOH-mg / g; the dispersant is any one or more of polyethylene oxide or potassium polyacrylate, wherein the true density of polyethylene oxide is in the range of 1.18Kg / L to 1.21Kg / L, and the potassium content of potassium polyacrylate is in the range of 12.0% to 14.0%.

[0014] As a preferred technical solution, the garbage fly ash toxic element migration blocking shielding material is characterized in that: the preparation method is as follows:

[0015] (1) Weigh a certain amount of blocking material and shielding material, place them in clean containers respectively, mix the two materials in one container, wash the mixture of the two materials with deionized water, and then filter it with the help of filter paper. Put the filtered mixture into an oven at 60°C for constant temperature drying for 12h-24h, finally put the dried mixture into a grinding dish, and carry out directional grinding and sieving (0.075mm), and put the sieved mixture into container 1.

[0016] (2) Weigh a certain amount of elemental desorption material and desorption catalyst and place them in a clean container. Use a handheld stirrer to directional stir and mix for 5 min-10 min, and then pour them into container 2 for later use.

[0017] (3) Weigh a certain amount of fixed attachment powdery substrate, pass it through a 0.075 mm sieve, take the powdery material under the sieve and wash it with water, then put the washed fixed attachment powdery substrate into a container, add methanol solution (25% concentration), soak for 3-4 hours, then add a certain amount of attachment promoting material and dispersant, and stir it with a stirrer at a speed of 500 rad / min-1000 rad / min for 20 minutes-30 minutes, finally put the mixture into a 50°C constant temperature box to dry for 36 hours-48 hours, and put the dried mixture into container 3 for standby use

[0018] (4) Pour the mixture in containers 1, 2 and 3 into a constant temperature mixing pot at 120°C, stir at a speed of 30 rad / min for 20 minutes, then add the electrostatic conductor material and the cross-linking agent, and introduce nitrogen into the mixing reactor. In the nitrogen atmosphere, use the oscillation mode and the dynamic stirring mode to mix the mixture for 30 minutes. After the mixing is completed, take out the mixture and quantitatively pack the mixture into hot-melt bags, thereby completing the preparation of the fly ash toxic element migration blocking shielding material.

[0019] Each component in the above application method has a strict preparation and mixing order, and improper addition will seriously affect the application effect of the component regulator.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) In the process of adding waste incineration fly ash to hot asphalt binder for resource utilization, the waste fly ash toxic element migration blocking shielding material of the present invention is pre-added to the hot asphalt. After the waste incineration fly ash is added to the asphalt, the waste fly ash will be evenly dispersed into the blocking network pre-formed by the blocking material in the asphalt binder under the action of the dispersant, effectively reducing the segregation and sedimentation rate of the waste fly ash in the asphalt binder, and providing time and space for the synergistic effect of other components; the element desorption material will comprehensively desorb and dissociate the heavy metal elements in the waste fly ash stagnant in the blocking network, and the desorption catalyst can accelerate the toxic elements to separate from the fly ash carrier and suspend in the asphalt binder; Due to the attraction of opposite free charges, the suspended toxic elements will migrate in a directed manner under the action of the electrostatic conductor material, gradually migrate and adsorb to the surface of the fixedly attached powdery substrate, and the attachment promoting material can synergistically accelerate the toxic elements to enter the interconnected composite pores inside the fixedly attached powdery substrate; finally, the negative ion shielding material will cover the surface of the fixedly attached substrate under the action of positive and negative charges, fill and seal the pore openings of the fixedly attached powdery substrate, thereby forming a shielding and encapsulation of the toxic elements, and the cross-linking agent can effectively enhance the cross-linking effect between the shielding material and the fixedly attached powdery substrate, ultimately forming a blocking and shielding effect on the migration of toxic elements in the waste incineration fly ash in the asphalt binder.

[0022] (2) The fly ash toxic element migration blocking shielding material provided by the present invention can not only effectively block and shield the leakage of toxic elements in the process of waste incineration fly ash resource utilization, but also enhance the dispersion and adhesion of waste fly ash in asphalt, thereby effectively ensuring the environmental protection and economy of the waste fly ash resource utilization as filler in road engineering, and has good application and promotion value. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the comparative examples and embodiments, the amount of fly ash from garbage incineration is 20% of the asphalt mass, and the asphalt uses 70# matrix asphalt binder. Preparation method of garbage fly ash toxic element migration blocking shielding material:

[0025] (1) Weigh a certain amount of blocking material and shielding material, place them in clean containers respectively, mix the two materials in one container, wash the mixture of the two materials with deionized water, filter it with filter paper, and place the filtered mixture in an oven at 60°C for constant temperature drying for 24 hours. Finally, place the dried mixture in a grinding dish, perform directional grinding and sieve (0.075 mm), and place the sieved mixture in container 1.

[0026] (2) Weigh a certain amount of elemental desorption material and desorption catalyst and place them in a clean container. Use a handheld stirrer to directional stir and mix for 10 minutes, and then pour them into container 2 for later use.

[0027] (3) Weigh a certain amount of fixed attachment powdery substrate, pass it through a 0.075 mm sieve, take the powdery material under the sieve and wash it with water, then put the washed fixed attachment powdery substrate into a container, add methanol solution (25% concentration), soak for 3 hours, then add a certain amount of attachment promoting material and dispersant, and stir it with a stirrer at a speed of 1000 rad / min for 20 minutes, finally put the mixture into a 50°C constant temperature box to dry for 36 hours, and put the dried mixture into container 3 for standby use

[0028] (4) Pour the mixture in containers 1, 2 and 3 into a constant temperature mixing pot at 120°C, stir at a speed of 30 rad / min for 20 minutes, then add the electrostatic conductor material and the cross-linking agent, and introduce nitrogen into the mixing reactor. In the nitrogen atmosphere, use the oscillation mode and the dynamic stirring mode to mix the mixture for 30 minutes. After the mixing is completed, take out the mixture and quantitatively pack the mixture into hot-melt bags, thereby completing the preparation of the fly ash toxic element migration blocking shielding material.

[0029] The components in the above application method have a strict preparation and mixing order, and improper addition will seriously affect the application effect of the component regulator. The specific substances corresponding to each component in each embodiment and their usage are as follows:

[0030] The true density of olefins is in the range of 1.2 Kg / L.

[0031] Example 9

[0032] The garbage fly ash toxic element migration blocking shielding material is characterized by comprising the following components, measured by mass: 100 parts of propylene glycol alginate, 17 parts of sodium p-styrene sulfonate, 5 parts of polycarbonate, 3.5 parts of chitin, 40 parts of limestone powder, 7 parts of aluminum hypophosphite, 2.5 parts of activated alumina, 2.7 parts of polycaprolactone, and 1.7 parts of polyethylene oxide.

[0033] The dielectric constant of polycarbonate is in the range of 3.2, and the specific surface area of ​​activated alumina is in the range of 330m 2 / g, the true density range of polyethylene oxide is 1.2Kg / L.

[0034] Example 10

[0035] The garbage fly ash toxic element migration blocking shielding material is characterized by comprising the following components, measured by mass: 100 parts of propylene glycol alginate, 20 parts of sodium p-styrene sulfonate, 6 parts of polycarbonate, 4 parts of chitin, 50 parts of limestone powder, 8 parts of aluminum hypophosphite, 3 parts of activated alumina, 3 parts of polycaprolactone, and 2 parts of polyethylene oxide.

[0036] The dielectric constant of polycarbonate ranges from 3.2, and the specific surface area of ​​activated alumina ranges from 360m 2 / g, the true density range of polyethylene oxide is 1.21Kg / L.

[0037] Embodiment 11

[0038] The garbage fly ash toxic element migration blocking shielding material is characterized by comprising the following components, measured by mass: 100 parts of styrene-isoprene-styrene, 10 parts of sodium p-styrene sulfonate, 3 parts of polyvinyl butyral, 2 parts of hydroxyproline, 20 parts of polyacrylamide, 4 parts of antimony trioxide, 1 part of polyaluminum sulfate, 2 parts of polycaprolactone, and 1 part of potassium polyacrylate.

[0039] The block ratio of styrene-isoprene-styrene is 2, the acetalization degree of polyvinyl butyral ranges from 72% to 84%, the hydrolysis degree of polyacrylamide ranges from 20% to 24%, the refractive index of antimony trioxide ranges from 2.137 to 2.264, the basicity of polyaluminum sulfate ranges from 25% to 35%, and the potassium content of potassium polyacrylate ranges from 12.0% to 14.0%.

[0040] Example 12

[0041] The garbage fly ash toxic element migration blocking shielding material is characterized by comprising the following components, calculated by mass: 100 parts of styrene-isoprene-styrene, 13 parts of sodium p-styrene sulfonate, 4 parts of polyvinyl butyral, 2.5 parts of hydroxyproline, 30 parts of polyacrylamide, 5 parts of antimony trioxide, 1.5 parts of polyaluminum sulfate, 2.3 parts of polycaprolactone, and 1.4 parts of potassium polyacrylate.

[0042] The styrene-isoprene-styrene block ratio is 2, the acetalization degree of polyvinyl butyral ranges from 76% to 80%, the hydrolysis degree of polyacrylamide ranges from 21%, the refractive index of antimony trioxide ranges from 2.188, the basicity of polyaluminum sulfate ranges from 28%, and the potassium content of potassium polyacrylate ranges from 13.0%.

[0043] Example 13

[0044] The garbage fly ash toxic element migration blocking shielding material is characterized by comprising the following components, calculated by mass: 100 parts of styrene-isoprene-styrene, 15 parts of sodium p-styrene sulfonate, 4.6 parts of polyvinyl butyral, 3 parts of hydroxyproline, 35 parts of polyacrylamide, 6 parts of antimony trioxide, 2 parts of polyaluminum sulfate, 2.5 parts of polycaprolactone, and 1.6 parts of potassium polyacrylate.

[0045] The styrene-isoprene-styrene block ratio is 2, the acetalization degree of polyvinyl butyral ranges from 78%, the hydrolysis degree of polyacrylamide ranges from 22%, the refractive index of antimony trioxide ranges from 2.197, the basicity of polyaluminium sulfate ranges from 30%, and the potassium content of potassium polyacrylate ranges from 13%.

[0046] Embodiment 14

[0047] The garbage fly ash toxic element migration blocking shielding material is characterized by comprising the following components, calculated by mass: 100 parts of styrene-isoprene-styrene, 17 parts of sodium p-styrene sulfonate, 5 parts of polyvinyl butyral, 3.5 parts of hydroxyproline, 40 parts of polyacrylamide, 7 parts of antimony trioxide, 2.5 parts of polyaluminum sulfate, 2.7 parts of polycaprolactone, and 1.7 parts of potassium polyacrylate.

[0048] The styrene-isoprene-styrene block ratio is 2, the acetalization degree of polyvinyl butyral ranges from 80%, the hydrolysis degree of polyacrylamide ranges from 23%, the refractive index of antimony trioxide ranges from 2.212, the basicity of polyaluminium sulfate ranges from 32%, and the potassium content of potassium polyacrylate ranges from 14.0%.

[0049] Embodiment 15

[0050] The garbage fly ash toxic element migration blocking shielding material is characterized by comprising the following components, measured by mass: 100 parts of styrene-isoprene-styrene, 20 parts of sodium p-styrene sulfonate, 6 parts of polyvinyl butyral, 4 parts of hydroxyproline, 50 parts of polyacrylamide, 8 parts of antimony trioxide, 3 parts of polyaluminum sulfate, 3 parts of polycaprolactone, and 2 parts of potassium polyacrylate.

[0051] The styrene-isoprene-styrene block ratio is 2, the acetalization degree of polyvinyl butyral ranges from 84%, the hydrolysis degree of polyacrylamide ranges from 24%, the refractive index of antimony trioxide ranges from 2.264, the basicity of polyaluminum sulfate ranges from 35%, and the potassium content of potassium polyacrylate ranges from 14.0%.

[0052] Example 16

[0053] The garbage fly ash toxic element migration blocking shielding material is characterized by comprising the following components, by mass: 100 parts of cellulose hydroxyethyl ether, 10 parts of polystyrene sulfonic acid, 3 parts of polyethylene terephthalate, 2 parts of hydroxyproline, 20 parts of halloysite powder, 4 parts of antimony trioxide, 1 part of polyaluminum sulfate, 2 parts of polycaprolactone, and 1 part of potassium polyacrylate.

[0054] The molar substitution range of cellulose hydroxyethyl ether is 1.8, the solid content of polystyrene sulfonic acid is 25%, the refractive index range of antimony trioxide is 2.137, the basicity range of polyaluminium sulfate is 25%, and the potassium content range of potassium polyacrylate is 12.0%.

[0055] Embodiment 17

[0056] The garbage fly ash toxic element migration blocking shielding material is characterized by comprising the following components, measured by mass: 100 parts of cellulose hydroxyethyl ether, 13 parts of polystyrene sulfonic acid, 4 parts of polyethylene terephthalate, 2.5 parts of hydroxyproline, 30 parts of halloysite powder, 5 parts of antimony trioxide, 1.5 parts of polyaluminum sulfate, 2.3 parts of polycaprolactone, and 1.4 parts of potassium polyacrylate.

[0057] The molar substitution range of cellulose hydroxyethyl ether is 1.8, the solid content of polystyrene sulfonic acid is 28%, the refractive index range of antimony trioxide is 2.188, the basicity range of polyaluminium sulfate is 28%, and the potassium content range of potassium polyacrylate is 13.0%.

[0058] Embodiment 18

[0059] The garbage fly ash toxic element migration blocking shielding material is characterized by comprising the following components, by mass: 100 parts of cellulose hydroxyethyl ether, 15 parts of polystyrene sulfonic acid, 4.6 parts of polyethylene terephthalate, 3 parts of hydroxyproline, 35 parts of halloysite powder, 6 parts of antimony trioxide, 2 parts of polyaluminum sulfate, 2.5 parts of polycaprolactone, and 1.6 parts of potassium polyacrylate.

[0060] The molar substitution range of cellulose hydroxyethyl ether is 1.8, the solid content of polystyrene sulfonic acid is 31%, the refractive index range of antimony trioxide is 2.197, the basicity range of polyaluminium sulfate is 30%, and the potassium content range of potassium polyacrylate is 13.0%.

[0061] Embodiment 19

[0062] The garbage fly ash toxic element migration blocking shielding material is characterized by comprising the following components, measured by mass: 100 parts of cellulose hydroxyethyl ether, 17 parts of polystyrene sulfonic acid, 5 parts of polyethylene terephthalate, 3.5 parts of hydroxyproline, 40 parts of halloysite powder, 7 parts of antimony trioxide, 2.5 parts of polyaluminum sulfate, 2.7 parts of polycaprolactone, and 1.7 parts of potassium polyacrylate.

[0063] The molar substitution range of cellulose hydroxyethyl ether is 1.9, the solid content of polystyrene sulfonic acid is 34%, the refractive index range of antimony trioxide is 2.212, the basicity range of polyaluminium sulfate is 32%, and the potassium content range of potassium polyacrylate is 14.0%.

[0064] Embodiment 20

[0065] The garbage fly ash toxic element migration blocking shielding material is characterized by comprising the following components, measured by mass: 100 parts of cellulose hydroxyethyl ether, 20 parts of polystyrene sulfonic acid, 6 parts of polyethylene terephthalate, 4 parts of hydroxyproline, 50 parts of halloysite powder, 8 parts of antimony trioxide, 3 parts of polyaluminum sulfate, 3 parts of polycaprolactone, and 2 parts of potassium polyacrylate.

[0066] The molar substitution range of cellulose hydroxyethyl ether is 1.9, the solid content of polystyrene sulfonic acid is 37%, the refractive index range of antimony trioxide is 2.264, the basicity range of polyaluminium sulfate is 35%, and the potassium content range of potassium polyacrylate is 14.0%.

[0067] Comparative Example 1

[0068] The garbage fly ash toxic element migration blocking shielding material is characterized by comprising the following components, calculated by mass: 35 parts of polyacrylamide, 6 parts of antimony trioxide, 2 parts of polyaluminium sulfate, 2.5 parts of polycaprolactone and 1.6 parts of potassium polyacrylate.

[0069] The hydrolysis degree of polyacrylamide ranges from 22%, the refractive index of antimony trioxide ranges from 2.197, the basicity of polyaluminium sulfate ranges from 30%, and the potassium content of potassium polyacrylate ranges from 13%.

[0070] Comparative Example 2

[0071] The garbage fly ash toxic element migration blocking shielding material is characterized by comprising the following components by mass: 2.5 parts of polycaprolactone and 1.6 parts of potassium polyacrylate.

[0072] The potassium content of potassium polyacrylate ranges from 13.0%.

[0073] The heavy metal element leaching test results of the asphalt binder prepared using the fly ash toxic element migration blocking shielding material involved in Examples 1-20 and Comparative Examples 1-2 are shown in Table 1-3 below.

[0074] Table 1 Heavy metal element leaching test results of Examples 1-10

[0075]

[0076] Table 2 Heavy metal element leaching test results of Examples 11-20

[0077]

[0078] Table 3 Comparative Example 1-2 Heavy metal element leaching test results

[0079]

[0080] Note: The heavy metal element leaching concentration test refers to "Determination of 65 Elements in Water Quality-Inductively Coupled Plasma Mass Spectrometry" (HJ700-2014).

[0081] According to Tables 1 to 3, the garbage fly ash toxic element migration blocking and shielding material involved in the present invention has a significant blocking and shielding effect on the migration of heavy metal elements in garbage fly ash in asphalt binder. After being applied to asphalt, the leaching concentrations of Zn, Cu, Pb and Cr of the garbage fly ash-asphalt mortar involved in the embodiments are much lower than those in the control example, and the blocking and shielding effects on the leaching of heavy metal elements from garbage fly ash can reach more than 90%, and can reach up to about 97%. This shows that the garbage fly ash toxic element migration blocking and shielding material involved in the present invention can achieve effective control of the migration of heavy metal elements in garbage fly ash in asphalt binder through the synergistic and coordinated effects of components such as blocking materials, shielding materials, electrostatic conductor materials, element desorption materials, fixedly attached powdery substrates, attachment promoting materials, desorption catalysts, cross-linking agents, dispersants, etc., thereby laying a foundation for the resource utilization of garbage fly ash in road engineering, and it has obvious innovation in the blocking and shielding of the migration behavior of heavy metal elements in garbage fly ash in asphalt binder.

[0082] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment according to the technical essence of the invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A fly ash toxic element migration blocking shielding material, characterized by: The composition comprises the following components by weight: 100 parts of blocking material, 10-20 parts of shielding material, 3-6 parts of electrostatic conductor material, 2-4 parts of element desorption material, 20-50 parts of fixed attachment powder substrate, 4-8 parts of attachment promoting material, 1-3 parts of desorption catalyst, 2-3 parts of cross-linking agent, and 1-2 parts of dispersant; The adhesion promoting material is any one or more of aluminum hypophosphite or antimony trioxide, wherein the phosphorus content of aluminum hypophosphite is greater than 45%, and the refractive index of antimony trioxide is in the range of 2.137 to 2.264; the desorption catalyst is any one or more of activated alumina or polyaluminum sulfate, and the specific surface area of ​​activated alumina is in the range of 280m 2 / g-360m 2 / g, the basicity range of polyaluminium sulfate is 25%-35%; The cross-linking agent is polycaprolactone, wherein the acid value of polycaprolactone is less than 1.0KOH-mg / g; the dispersant is any one or more of polyethylene oxide or potassium polyacrylate, wherein the true density of polyethylene oxide is in the range of 1.18Kg / L to 1.21Kg / L, and the potassium content of potassium polyacrylate is in the range of 12.0% to 14.0%; The blocking material is any one or more of carbomer resin, propylene glycol alginate, styrene-isoprene-styrene, and cellulose hydroxyethyl ether; The shielding material is any one or more of polystyrene sulfonic acid or sodium p-styrene sulfonate; The electrostatic conductor material is any one or more of polyethylene terephthalate, polycarbonate or polyvinyl butyral; The element desorption material is any one or more of chitin and hydroxyproline.

2. The fly ash toxic element migration blocking shielding material according to claim 1, characterized in that: The invention comprises the following components by mass: 100 parts of blocking material, 13-17 parts of shielding material, 4-5 parts of electrostatic conductor material, 2.5-3.5 parts of element desorption material, 30-40 parts of fixed attachment powder substrate, 5-7 parts of attachment promoting material, 1.5-2.5 parts of desorption catalyst, 2.3-2.7 parts of cross-linking agent and 1.4-1.7 parts of dispersant.

3. The fly ash toxic element migration blocking shielding material according to claim 2 is characterized by: The composition includes the following components by mass: 100 parts of blocking material, 15 parts of shielding material, 4.6 parts of electrostatic conductor material, 3 parts of element desorption material, 35 parts of fixed attachment powder substrate, 6 parts of attachment promoting material, 2 parts of desorption catalyst, 2.5 parts of cross-linking agent and 1.6 parts of dispersant.

4. The fly ash toxic element migration blocking shielding material according to any one of claims 1 to 3, characterized in that: The carboxylic acid group content of the carbomer resin ranges from 60% to 64%, the esterification degree of propylene glycol alginate is ≥85.0, the styrene-isoprene-styrene block ratio is ≥2, and the molar substitution degree of cellulose hydroxyethyl ether ranges from 1.8 to 1.

9.

5. The fly ash toxic element migration blocking shielding material according to any one of claims 1 to 3, characterized in that: The solid content of polystyrene sulfonic acid is 25%-37%, and the vinyl activity of sodium styrene sulfonate is >92%.

6. The fly ash toxic element migration blocking shielding material according to any one of claims 1 to 3, characterized in that: The dielectric constant of polycarbonate ranges from 3.0 to 3.2, and the acetalization degree of polyvinyl butyral ranges from 72% to 84%.

7. The fly ash toxic element migration blocking shielding material according to any one of claims 1 to 3, characterized in that: The fixedly attached powdery substrate is any one or more of limestone powder, halloysite powder or polyacrylamide, wherein the particle size of limestone powder and halloysite powder should be less than 0.6 mm, the plasticity index should be less than 4, the polyacrylamide should be anionic, and the hydrolysis degree range is 20%-24%.

8. The fly ash toxic element migration blocking shielding material according to any one of claims 1 to 3, characterized in that: The material preparation method is as follows: (1) Weigh a certain amount of blocking material and shielding material, place them in clean containers respectively, mix the two materials in one container, wash the mixture of the two materials with deionized water, filter it with filter paper, and place the filtered mixture in an oven at 60°C for constant temperature drying for 12h-24h, finally place the dried mixture in a grinding dish, perform directional grinding and sieve, and place the sieved mixture into container 1; (2) Weigh a certain amount of elemental desorption material and desorption catalyst and place them in a clean container. Use a handheld stirrer to stir and mix them for 5 min to 10 min, and then pour them into container 2 for later use; (3) Weigh a certain amount of fixed attachment powdery substrate, pass it through a 0.075 mm sieve, take the powdery material under the sieve and wash it with water, then put the washed fixed attachment powdery substrate into a container, add methanol solution, soak it for 3-4 hours, then add a certain amount of adhesion promoting material and dispersant, and stir it with a stirrer at a speed of 500 rad / min-1000 rad / min for 20 minutes-30 minutes, finally put the mixture into a 50°C constant temperature box to dry for 36 hours-48 hours, and put the dried mixture into container 3 for standby use; (4) Pour the mixture in containers 1, 2 and 3 into a constant temperature mixing pot at 120°C, stir at a speed of 30 rad / min for 20 minutes, then add the electrostatic conductor material and the cross-linking agent, and introduce nitrogen into the mixing reactor. In the nitrogen atmosphere, use the oscillation mode and the dynamic stirring mode to mix the mixture for 30 minutes. After the mixing is completed, take out the mixture and quantitatively pack the mixture into hot-melt bags, thereby completing the preparation of the fly ash toxic element migration blocking shielding material.

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