LU600028B1 - A solid waste capsule for municipal waste incineration fly ash and its manufacturing process and application - Google Patents

Abstract

This application provides a solid waste capsule for municipal waste incineration fly ash, as well as its production process and application, which belongs to the technical field of solid and hazardous waste resource utilization. The solid waste capsule of this application is mainly used for the synthesis of fly ash-based gelling materials in the resource utilization of municipal waste incineration fly ash. The solid waste capsule hydrates to produce a cross-linked polymer in the hydration process of the alkali-stimulated preparation of fly ash-based gelling agents. The soluble chloride salts and heavy metals in the fly ash-based gelling material interact with the C-(A)-S-H gel and the C-N/K-S-H gel in the cross-linked polymer formed by repeated hydration in an alkaline environment to form a more stable precipitate that adheres to the surface of the three-dimensional lattice structure of the solid waste capsule. The solid waste capsule of the present application has a strong targeted chemical binding capacity for heavy metals and chloride ions, so that the heavy metals and chloride ions can be adsorbed on the surface of the three-dimensional lattice structure formed by the solid waste capsule, so as to achieve the effect of preventing the leaching of heavy metals and chloride ions from the fly ash and reducing the environmental risk, while improving the stability of the fly ash-based gelling agent itself.

Description

A solid waste capsule for domestic waste incineration fly ash and its LU600028

Manufacturing process and application

Technical area

The present application belongs to the technical field of the recovery of solid and hazardous waste and relates in particular to a solid waste capsule for

Municipal waste incineration fly ash and its production processes and applications.

Technology in the background

Against the background of the increasing increase in household waste production, the

By-products of combustion produce a large amount of fly ash (IFA), which is classified as hazardous waste

HWI18. The current methods for treating and recycling

Fly ash mainly includes fly ash hardening, resource utilization and

Deep treatment, such as cement/chemical curing, cement kiln co-incineration, and chemical extraction and separation techniques. Considering the hazardous

Properties of fly ash containing water-soluble salts, various heavy metals,

Dioxins and other pollutants, the structural, causal and trend-related problems have not yet been fundamentally resolved, leading to numerous limitations in technologies and pathways for treatment, disposal and use of resources.

Due to the special physico-chemical properties (Si/Al 8-12 percent, Ca 30-50 percent) and the crystal structure of fly ash, it was found that the development of the technology for alkaline activated cementitious materials based on fly ash could be facilitated by optimizing the solid waste content, activator dosage,

curing process and other parameters. The sensible use of

Fly ash for the production of alkaline cementitious materials still faces some technical and legal obstacles: large differences in the mineral

components, fluctuating chemical properties, high porosity of the curing body, the

Lack of suitable additives that, under the influence of the external environment, produce slightly toxic

substances and cause secondary environmental pollution. Therefore, the

The question of how to ensure that heavy metals and soluble chloride salts are in a long-term stable curing state in various disposal environments has become a major challenge in the research process to improve the resource utilization of

To achieve fly ash in synergy with other waste.

Content of the invention

The aim of this application is to develop a solid waste capsule for domestic waste incineration

To provide fly ash and a process for its production and application in order to

To prevent leaching of heavy metals and chloride ions from the fly ash,

environmental risk and also significantly improve the stability of the fly ash-based gelling material itself, which is a necessary improvement in resource-saving

Use of fly ash.

In order to achieve the above-mentioned purpose, in a first aspect of the present

Application for a method for producing a solid waste capsule for

Municipal waste incineration fly ash is provided, which includes the following steps:

Preparing a colloidal solution containing Pt nanoparticles and TiO2 nanoparticles,

Freeze-drying the colloidal solution to obtain a Pt/TiO2 freeze aerogel material;

Stirring and mixing the solution containing chloroplatinic acid and g-C3N4 and obtaining the Pt/g-C3N4 NPs nanocomposite material after washing and drying;

A first mixed solution containing N-isopropylacrylamide, N, N'-methylenebisacrylamide urk/600028

Poly-N, N-2-methylacrylamide was prepared, and a second mixed solution containing

Persulfate and N-allylthiourea was added to the first mixed solution.

After mixing, solid-liquid separation was performed and 2,2-azobis(2-methylpropylimide) dihydrochloride and water were added to the separated solid product, which was purified and freeze-dried to obtain PNCH nanocomposite hydrogel;

Addition of the Pt/TiO2 cryo-aerogel material, the Pt/g-C3N4 nanocomposites, the

PNCH nanocomposite hydrogel and tetramethylethylenediamine to a solution that

acrylamide, bisacrylamide and an initiator to obtain a mixed system, and

Carrying out a curing reaction of the mixed system to obtain PNCH-Pt/TiO2-g-C3Na-

to obtain nanocomposites.

Furthermore, the mass ratio of acrylamide, bisacrylamide, frozen

Pt/TiO2 airgel material, the Pt/g-C:N4 NPs nanocomposites and the PNCH nanocomposite

Hydrogels in the hybrid system 10-15:0,8:5-8:10-15:12-15. The initiator is added in an amount of 3-8% of the mass of the mixed system, and the tetramethylethylenediamine is added in an amount of 20-25% of the mass of the mixed system.

Furthermore, the following conditions apply to the curing reaction: freezing temperature 0 °C in a liquid nitrogen atmosphere, curing time 2-4 h.

Furthermore, in the solution containing chloroplatinic acid and g-C3N4, the mass ratio of chloroplatinic acid and g-C3N4 is 4:15-20.

Furthermore, the colloidal solution has a mass fraction of 16.5-17.5% of the Pt-

nanoparticles and a mass fraction of 16-18% of the TiO2 nanoparticles.

Furthermore, the initiator is persulfate.

Furthermore, in the first mixed solution, the mass ratio of N-

Isopropylacrylamide, N,N'-methylenebisacrylamide and poly-N,N-2-methacrylamide 18-20:1:15-16 and the concentration of N-isopropylacrylamide 85-95%; In the second mixed

Solution, the mass ratio of persulfate to N-allylthiourea is 3:3-5, which

Mass ratio of N-isopropylacrylamide to N-allylthiourea is 41:150-160; and the

Mass ratio of 2,2-azobis(2-methylpropylimide) dihydrochloride to the N-

Allylthiourea is 41:900-950.

In a second aspect of the present application, a solid waste capsule for

Municipal waste incineration fly ash obtained by the production process described in one of the preceding points.

A third aspect of the present application concerns the use of a fixed

Waste capsule for domestic waste incineration fly ash in the production of a gelling material on

Fly ash base, wherein the solid waste capsule for municipal waste incineration fly ash with a

Mass ratio of 0.5 to 3.0% is added to the fly ash-based gelling material.

Preferably, the solid waste capsule for municipal waste incineration fly ash is added in an amount of 1.25%.

Furthermore, the fly ash-based gelling material comprises the following components in

Percentage by weight: 50-65 parts fly ash for domestic waste incineration, 8-12 parts

Furnace bottom slag, 20-25% slag, 1-5% phosphogypsum, 3-9% alkali activator, and 1-3% CaCl2. The preferred proportion of municipal waste incineration fly ash is 55%.

Furthermore, the alkali regulator is at least one of sodium hydroxide, sodium silicate ur 600028

Potassium hydroxide. Furthermore, the alkaline agent is sodium hydroxide, sodium silicate and

Potassium hydroxide, and the mass ratio of sodium hydroxide, sodium silicate and

Potassium hydroxide is 2:1:2.

Compared to the prior art, the present application has the following technical advantages:

A solid waste capsule for

Municipal waste incineration fly ash belongs to a nanopolymer with a three-dimensional cross-linked molecular network, which is mainly formed by covalent or non-covalent

interactions, including physical entanglement,

Hydrogen bonding, hydrophobic interaction, supramolecular interaction, electrostatic interaction and ligand interaction.

A solid waste capsule produced in this application for domestic waste incineration

Fly ash is mainly used for the synthesis of fly ash-based gelling agents in

Resource utilization of municipal waste incineration fly ash. The solid waste capsule hydrates during the hydration process of the alkaline-stimulated preparation of the

Fly ash-based gelling material, the gelling material to produce a cross-linked polymer that enables the soluble chloride salts and heavy metals in the fly ash-based

Gelling material allows the C-(A)-S-H gel and the C-N/K-S-H gel in the cross-linked

Polymer formed by hydration to interact many times in the alkaline environment. This makes it easier for the soluble chloride salts and heavy metal ions to form more stable

to form precipitates that are deposited on the surface of the three-dimensional lattice structure of the solid

Securing waste capsule in chemical-physical roles.

A solid waste capsule produced in the present application for

Domestic waste incineration fly ash has a strong targeted chemical binding capacity for

Heavy metals and chloride ions, which allows heavy metals and chloride ions to be removed from the

surface of the three-dimensional lattice structure of the solid waste capsule. The solid waste capsule prepared in this application exhibits strong adhesion and excellent compatibility with the interfacial organization between the cross-linked

polymer produced by the hydration of the gelling material and achieves the effect of preventing the leaching of heavy metals and chloride ions from the fly ash and

environmental risk, while significantly improving the stability of the fly ash-based gelling material itself, which is a necessary improvement in the resource-efficient use of fly ash.

A solid waste capsule produced in this application for domestic waste incineration

Fly ash can solve the current technical problem that solidified hazardous waste such as

Fly ash cannot be recycled in a resource-saving manner, so that

Municipal waste incineration fly ash can be recycled on a large scale under room temperature conditions.

Detailed description

To make the technical problems, technical solutions, and advantageous effects to be solved by the present application clearer and more understandable, the present application is described in more detail below in combination with exemplary embodiments. It should be understood that the specific embodiments described herein serve only to illustrate the present application and are not intended to limit the present application. LU600028

In this application, "at least one" refers to one or more and "more than one" refers to two or more. "At least one of the following" or similar expressions refer to any combination of these elements, including any

Combination of single (one) or multiple (one) elements. For example, "at least one (of) a, b, or c" or "at least one (of) a, b, and c" can be expressed as: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c. Where a, b, and c can each be single or multiple.

The terminology used in the embodiments of this application is for the purpose of describing a particular embodiment only and is intended to

The singular forms of "a," "a," "says," and "the" as used in this example and the appended claims are intended to include the plural forms unless the context clearly indicates otherwise.

The weights of the relevant components mentioned in the specification of the embodiments of the present application may refer not only to the specific contents of the components, but also to the proportional relationship of the weights of the

Components, and therefore, any increase or decrease in the contents of the relevant components in accordance with the specification of the embodiments of the present application is within the scope of the disclosure of the specification of the embodiments of the present application. In particular, the mass described in the description of the embodiments of the present application may be a mass unit such as µg, mg, g, kg, and the like, which are well known in the field of biochemistry.

The terms “first” and “second” are used for descriptive purposes only, to

Purposes such as to distinguish substances from one another, and are not to be understood as indicating a relative importance or implicitly specifying the number of technical features recited. For example, without departing from the scope of the embodiments of the present application, the first XX may also be referred to as the second XX, and similarly, the second XX may also be referred to as the first XX. Thus, the feature defined as "first" and "second" may expressly or implicitly encompass one or more such features.

A solid waste capsule for municipal waste incineration fly ash, its manufacturing process and the application of the embodiments of the present application are presented below with reference to a plurality of specific embodiments.

Embodiment 1

Embodiment 1 of the present application provides a solid capsule for

Municipal waste incineration fly ash and a process for its production, which has the following

Steps include: (1) Preparation of a Pt nanoparticle-containing solution: 0.02 g of platinum chloride (PtCl4) was dissolved in 10 mL of deionized water and stirred until dissolved, heated to 100 °C, and then boiled for 1 minute to obtain the platinum chloride solution; 0.11 g of trisodium citrate and 7.6 g of sodium borohydride (the mass ratio of trisodium citrate and sodium borohydride is 11:760) were added to the platinum chloride solution. The solution containing Pt nanoparticles (Pt NPs) was obtained by heating to 80 °C and stirring for 10 minutes. (2) The Pt NP solution was added to a certain amount of TiO2 nanoparticle solution to obtain a Pt/TiO2 colloidal solution with a Pt mass fraction of 17%.

The colloidal solution was stirred for 2 hours in an ultrasonic liquid homogenizer and then transferred to liquid nitrogen, quickly frozen for 10 minutes, then dried and placed in a vacuum environment for 48 hours to freeze the frozen Pt/TiOz-

aerogel material. 5 (3) In air, 5 g of urea were wrapped with aluminum foil and placed in a

alumina crucible, then placed in a muffle furnace and heated to 550 °C and 2

Calcined for 3 hours under air flow to obtain g-C3N4 powder material, which was dissolved in 20 ml of 10% methanol solution to obtain a g-C3N4 solution. (4) Mix a platinum chloride solution with a mass fraction of 4% and a g-C3N4

solution with a mass fraction of 13% and stir vigorously for 2 hours. Subsequently, the solid-liquid separation was carried out, and the separated solids were mixed with

Ethanol solution and then placed in a 50 °C electric oven for 12 hours to dry to obtain the Pt/g-C3N4 nanocomposites. (5) 0.93 g of N-isopropylacrylamide (NIPAm) monomer, 0.093 g of N,N'-methylenebisacrylamide (MBAA), and 1.0 g of poly-N,N-2-methacrylamide (PDMA) were dissolved in 150 mL of water to obtain a

PNIPAm solution; After 150 ml of water had been deoxidized by bubbling with N2 for 30 minutes, 0.075 g of potassium persulfate (K208S2) and 0.10 g of N-

Allylthiourea (ATU) to obtain a mixed solution. The mixed solution was then transferred to a PNIPAm solution and reacted for 30 minutes under a nitrogen atmosphere. It was then stirred for 20 minutes in a

High-speed centrifuge (1800 rpm). After removing the supernatant, 0.041 g of 2,2-azobis(2-methylpropylimide) dihydrochloride (AAPH) and 150 ml of deionized water were added and centrifuged three times under the same conditions to obtain the purified PNCH solution. The purified PNCH solution was then freeze-dried for 48 hours and transferred to a desiccator to obtain the PNCH nanocomposite hydrogel. (6) Acrylamide and bisacrylamide were mixed in a mass ratio of 19:1 to form an acrylamide solution with an acrylamide concentration of 0.156 g/ml. During the

During mixing, ammonium persulfate solution was added with a mass fraction of 10%, 5

minutes and successively 5 g of frozen Pt/TiO2 aerogel material, 2 g Pt/g-C3N4

NPs nanocomposite, 20 g of PNCH nanocomposite hydrogel, and 35 g of tetramethylethylenediamine were added under nitrogen atmosphere. The mixed system was poured into a mold and cured for 2 hours in a liquid nitrogen atmosphere to a freezing temperature of 0 °C to obtain PNCH-Pt/TiO2-g-C3N4 nanocomposites, i.e., a solid waste capsule for

domestic waste incineration fly ash.

Embodiment 2

Embodiment 2 of the present application provides a solid waste capsule for

Municipal waste incineration fly ash and a process for its production, which has the following

Steps include: (1) Prepare a solution containing Pt nanoparticles: 0.02 g of platinum chloride (PtCl4) is dissolved in 10 ml of deionized water and stirred until dissolved, then heated to 100 °C and boiled for 1 minute to obtain a platinum chloride solution; 0.11 g

Trisodium citrate and 7.6 g sodium borohydride (the mass ratio of trisodium citrate and

Sodium borohydride is 11:760) to the platinum chloride solution and stir for 12 minutes after heating to 90 °C to obtain the solution containing Pt nanoparticles (Pt NPs).

(2) The Pt NP solution was added to a certain amount of TiO2 nanoparticle solution/600028 to obtain a Pt/TiO2 colloidal solution with a platinum mass fraction of 17% and a TiO2 nanoparticle mass fraction of 18%. The colloidal solution was stirred homogeneously in an ultrasonic liquid mixer for 1.5 hours, then transferred to liquid nitrogen, quickly frozen for 12 minutes, then dried and stored for 48 hours.

hours in a vacuum environment to obtain the frozen Pt/TiO2 aerogel material. (3) In air, 5 g of urea was wrapped with aluminum foil and placed in a

alumina crucible, then heated to 600 °C in a muffle furnace and kept for 2 hours at the

Calcined in air to obtain the g-C3N4 powder material, which was dissolved in 20 ml of 10% methanol solution to obtain the g-C3N4 solution. (4) The platinum chloride solution with a mass fraction of 4% was mixed with the g-C3N4 solution with a mass fraction of 13% and stirred vigorously for 2 h. The solid was then

Liquid separation was performed, and the separated solids were washed with ethanol solution and then placed in a 60 °C electric oven for 12 h to dry. The Pt/g-C3N4-

Nanocomposites were obtained. (5) PNIPAm solution was prepared by dissolving 0.93 g of N-isopropylacrylamide (NIPAm)-

Monomer, 0.093 g N,N'-methylenebisacrylamide (MBAA) and 1.0 g polyN,N-2-methylacrylamide (PDMA) in 150 ml water; After 150 ml water had been deoxidized by bubbling with Na for 30 minutes, 0.075 g potassium persulfate (K208S2) and 0.10 g N-

Allylthiourea (ATU) to obtain a mixed solution. The mixed solution was then transferred to a PNIPAm solution and reacted for 30 minutes under nitrogen atmosphere. It was then stirred for 20 minutes in a

High-speed centrifuge (1800 rpm). After removing the supernatant, 0.041 g of 2,2-azobis(2-methylpropylimide) dihydrochloride (AAPH) and 150 ml of deionized water were added and centrifuged three times under the same conditions to obtain the purified PNCH solution. The purified PNCH solution was then freeze-dried for 48 hours and transferred to a desiccator to obtain the PNCH nanocomposite hydrogel. (6) Acrylamide and bisacrylamide were mixed in a mass ratio of 19:1 to form an acrylamide solution with an acrylamide concentration of 0.156 g/ml. During the

During mixing, ammonium persulfate solution was added with a mass fraction of 10%, 5

minutes and successively 5 g of frozen Pt/TiO2 aerogel material, 2 g Pt/g-C3N4

NPs nanocomposite, 20 g of PNCH nanocomposite hydrogel, and 35 g of tetramethylethylenediamine were added under nitrogen atmosphere. The mixed system was poured into a mold and cured for 2 hours in a liquid nitrogen atmosphere to a freezing temperature of 0 °C to obtain PNCH-Pt/TiO2-g-C3N4 nanocomposites, i.e., a solid waste capsule for

to obtain household waste incineration fly ash.

Embodiment 3

Embodiment 3 of the present application provides a solid waste capsule for

Municipal waste incineration fly ash and a process for its production, which has the following

Steps include: (1) Prepare a solution containing Pt nanoparticles: 0.02 g of platinum chloride (PtCl4) is dissolved in 10 ml of deionized water and stirred until dissolved, then heated to 100 °C and boiled for 1 minute to obtain a platinum chloride solution; 0.11 g

Trisodium citrate and 7.6 g sodium borohydride (the mass ratio of trisodium citrate urk/600028

Sodium borohydride (11:760) was added to the platinum chloride solution and stirred after heating at 100 °C for 8 minutes to obtain a solution containing Pt nanoparticles (Pt NPs). (2) The Pt NP solution was added to a certain amount of TiO2 nanoparticle solution to obtain a Pt/TiO2 colloidal solution with a platinum mass fraction of 17% and a TiO2 nanoparticle mass fraction of 18%. The colloidal solution was stirred evenly in an ultrasonic liquidizer for 2.5 hours, then transferred to liquid nitrogen, quickly frozen for 8 minutes, dried, and placed in a vacuum environment for 48 hours to obtain the frozen Pt/TiO2 aerogel material. (3) In air, 5 g of urea were wrapped with aluminum foil and placed in a

alumina crucible, then placed in a muffle furnace to raise the temperature to 500 °C, and calcined under air flow for 3 hours to obtain g-C3N4 powder material, which was dissolved in 20 ml of 10% methanol solution to obtain a g-C3N4 solution. (4) Mix a platinum chloride solution with a mass fraction of 4% and a g-C3N4

solution with a mass fraction of 13% and stir vigorously for 2 hours. Subsequently, the solid-liquid separation was carried out, and the separated solids were mixed with

ethanol solution and then placed in a 60 °C electric oven for 12 hours to dry to obtain the Pt/g-C3N4 nanocomposites. (5) Dissolve 0.93 g of N-isopropylacrylamide (NIPAm) monomer, 0.093 g of N,N'-methylenebisacrylamide (MBAA), and 1.0 g of poly-N,N-2-methylacrylamide (PDMA) with 150 mL of water to obtain a

PNIPAm solution; After 150 ml of water had been deoxidized by bubbling with Nz for 30 minutes, 0.075 g of potassium persulfate (K208S2) and 0.10 g of N-

Allylthiourea (ATU) to obtain a mixed solution. The mixed solution was then transferred to a PNIPAm solution and reacted for 30 minutes under a nitrogen atmosphere. It was then stirred for 20 minutes in a

High-speed centrifuge (1800 rpm). After removing the supernatant, 0.041 g of 2,2-azobis(2-methylpropylimide) dihydrochloride (AAPH) and 150 ml of deionized water were added and centrifuged three times under the same conditions to obtain the purified PNCH solution. The purified PNCH solution was then freeze-dried for 48 hours and transferred to a desiccator to obtain the PNCH nanocomposite hydrogel. (6) Acrylamide and bisacrylamide were mixed in a mass ratio of 19:1 to form an acrylamide solution with an acrylamide concentration of 0.156 g/ml, and a

Ammonium persulfate solution with a mass fraction of 10% was added while stirring.

Degassing was carried out for 5 minutes and 5 g of frozen Pt/TiO2 aerogel material, 2 g of Pt/g-C3N4 NPs nanocomposites, 20 g of PNCH nanocomposite hydrogel and 35 g

Tetramethylethylenediamine were added sequentially in a nitrogen atmosphere. The mixed system was poured into a mold and stored for 2 hours in a

Liquid nitrogen atmosphere to a freezing temperature of 0 °C to obtain PNCH-

Pt/TiO2-g-C3N4 nanocomposites, i.e. a solid waste capsule for

Municipal waste incineration fly ash.

Application example

The solid capsule for municipal waste incineration fly ash prepared in Embodiment 1 was added to the fly ash-based gelling agent in a mass ratio of 1.25%,

and the fly ash-based gelling agent consisted of the following ingredients (dt&/600028

Total number of parts was 100 parts in the calculation): 55 parts of municipal waste incineration fly ash, 11 parts of furnace bottom slag, 23 parts of slag, 5 parts of phosphogypsum, 2 parts of NaOH, 2 parts of KOH, 1 part of Na2Si03 and 1 part of CaCl2, as shown in Table 1.

Table 1 Composition of cementitious materials based on fly ash

Raw materials | Flue gas | Blast furnace ash | Sludge | Phosphorus | NaO | KO | Na2Si | CaC | Water | materials such as varnishes and gypsum H H O3 12 -

Cemen t-

Relationship

Ratio | 55% 11% 23% 5% 2% | 2% 1% 1% 0.67 s

The components of the fly ash-based gelling agent, fly ash from the

Domestic waste incineration and solid waste capsules were mixed and thoroughly stirred for 10-20 minutes, followed by 28 days of maintenance at a temperature of 25+1 °C and a relative humidity of > 90% under standard maintenance conditions for the curing of soluble chloride ions and heavy metals. The heavy metals mainly include Cd,

Cr, Pb, Cu, Zn, Hg, As, Ni, etc.

The relevant properties of the cured cementitious materials were determined under

Reference to the line standard, Standard test methods for basic properties of

Baumôrtel” (JGJ/T70-2009) as shown in Table 2.

Table 2: Relevant properties of cementitious fly ash-based materials

Indi | Pressure resistance | Density | Water loss | Water | Air | pH | catalytic | ity g/cm* | Frost | absorption | retention | resistance value r / MPa thawing resistance %

Alternating strength % %

Erge 24.56 8,528 15.55 32.64 92.6 29 8.86 bnis se

The hardened gel material is treated by leachate with reference to the standard “Solid Waste Leaching Toxicity Leaching Method Sulphuric acid Nitric acid

Method" (HJ T 299-2007), in which heavy metals are detected by ICP-MS based on the standard "Determination of 65 elements in water by inductively coupled plasma mass spectrometry" (HJ 700-2014); chloride ions were detected by ICP-MS based on the standard "Water quality determination of chloride silver nitrate titration" (GB 11896-89), and the test results are shown in Table 3.

Table 3 Detection results of chloride ions and heavy metals in leaching solution

LW600028

Element | CI | CD | Cr | Po | Cu | Zn | Hg | Ace | Ni 1 0.72% | 0.08% | 0.03% | 0.04% | 0.01% | 0.01% | 0.005 | 0.04% | 0.02% % 2 0.63% | 0.01% | 0.05% | 0.03% | 0.01% | 0.01% | 0.007 | 0.05% | 0.02% % 3 0.21% | 0.03% | 0.03% | 0.03% | 0.01% | 0.01% | 0.006 | 0.03% | 0.03%

Average | 0.52% | 0.04% | 0.043 | 0.033 | 0.01% | 0.01% | 0.006 | 0.04% | 0.023 % % % %

Curing rate | 99.48 | 99.96 | 99.96 | 99.97 | 99.99 | 99.99 | 99.99 | 99.96 | 99.98 e % % % % % % % % %

The test results in Table 3 show that the curing efficiency of

Chloride ions and heavy metals Cd, Cr, Pb, Cu, Zn, Hg, As and Ni are 99.48%, 99.96%, 99.96%, 99.97%, 99.99%, 99.99%, 99.96% and 99.98% respectively. This indicates that the

The curing capsule produced in accordance with the present application has a good

Curing effect on chloride ions and heavy metals in the fly ash-based

Gelling material has achieved a curing rate of more than 99.4% and prevents dissolution while ensuring pH stability.

Comparison ratio

The solid waste capsule for municipal waste incineration fly ash was not added to the fly ash-based gelling agent of the above application example, and it was maintained for 28 days under the same standard maintenance conditions, and the content of

Chloride ions and heavy metals in the leachate of the maintained gelling agent were detected, and the detection results are shown in Table 4.

Table 4: Results of the detection of chloride ions and heavy metals in

Leachate

Element | CI | cd | Cr | Po | Cu | Zn | Hg | Ace | Ni 1 1.59% | 1.24% | 0.81% | 0.21% | 1.61% | 0.81% | 0.023 | 4.63% | 0.24% % 2 2.34% | 3.21% | 0.65% | 0.24% | 0.71% | 0.74% | 0.011 | 2.58% | 0.34% % 3 1.95% | 2.36% | 0.63% | 0.10% | 0.29% | 1.14% | 0.014 | 2.30% | 0.21%

Average | 1.96% | 2.27% | 0.70% | 0.18% | 0.87% | 0.90% | 0.02% | 3.17% | 0.26%

Curing rate | 98.04 | 97.73 | 99.30 | 99.82 | 99.13 | 99.10 | 99.98 | 96.83 | 99.74 e % % % % % % % % %

As can be seen from the test results in Table 4, the content of chloride ions and

Heavy metals in the cured leachate are higher than in Table 3, if the

Solidification capsule for domestic waste incineration fly ash not for gelling material ah/600028

fly ash base is added. This shows that the curing capsule produced by the embodiments of the present application has a good curing effect on the

chloride ions and heavy metals in the fly ash-based collodion material and can effectively inhibit the leaching of heavy metals and chloride ions in the fly ash and reduce the environmental risk.

A solid waste capsule for municipal waste incineration fly ash, which is

The polymer produced in accordance with the present application belongs to a nanopolymer with a three-dimensional cross-linked molecular network. The network is formed mainly by covalent or non-covalent interactions, including physical

Entanglement, hydrogen bonds, hydrophobic interactions, supramolecular

Interactions, electrostatic interactions and ligand interactions. After application to fly ash-based gelling agents, the gelling agents were

Hydration process of the alkaline-stimulated preparation of fly ash-based gelling agents to produce cross-linked polymers, thereby removing the soluble chloride salts and

Heavy metals in the fly ash-based gelling agents with the C-(A)-S-H gels and C-N/K-S-

H-gels in the gelling agents formed by hydration interact many times in the alkaline environment. This makes it easier for the soluble chloride salts and

Heavy metal ions to form more stable precipitates that attach to the surface of the three-dimensional lattice structure of the solid waste capsule in chemical-physical roles.

A solid waste capsule for municipal waste incineration fly ash, which is

Embodiment of the present application is mainly used for the

Synthesis of fly ash-based gelling materials in the resource utilization of

Domestic waste incineration fly ash is used, and the solid waste capsule has a strong targeted chemical binding capacity for heavy metals and chloride ions, which allows the heavy metals and chloride ions to be deposited on the surface of the three-dimensional

lattice structure of the solid waste capsule. The solid waste capsule produced by the embodiments of the present application has strong adhesion and excellent compatibility with the interface organization between it and the

The cross-linked polymer produced by hydration of the gelling material and achieves the effect of

To prevent leaching of heavy metals and chloride ions from the fly ash and

environmental risk, while improving the stability of the gelling material on

fly ash base itself, which represents a necessary improvement in the resource-saving use of fly ash. It effectively solves the current technical

Problem that solidified hazardous waste such as fly ash cannot be recycled in a resource-efficient manner, and makes fly ash from domestic mill incineration under

Room temperature conditions available for large-scale use.

The above embodiments express only some embodiments of the present

Registration, which are described more specifically and in more detail, but are not intended as

It should be noted that for a person with ordinary skill in the art,

technology several modifications and improvements can be made without deviating from the

Concept of the present application, all of which fall within the scope of protection of the present application. The scope of protection of the patent application is therefore determined by the appended claims.

LU600028

Claims (10)

Claims LU600028 1. A method for producing a solid waste capsule for municipal solid waste incineration fly ash, characterized by comprising the following steps: preparing a colloidal solution containing Pt nanoparticles and TiO2 nanoparticles; freeze-drying the colloidal solution to obtain a frozen Pt/TiO2 aerogel material; stirring and mixing the solution containing chloroplatinic acid and g-C3N4; washing and drying to obtain a Pt/g-C3N4 NPs nanocomposite material; A first mixed solution containing N-isopropylacrylamide, N,N'-methylenebisacrylamide, and polyN,N-2-methylacrylamide was prepared, and a second mixed solution containing persulfate and N-allylthiourea was added to the first mixed solution. After mixing, solid-liquid separation was performed, and 2,2-azobis(2-methylpropylimide) dihydrochloride and water were added to the separated solid product, which was purified and freeze-dried to obtain PNCH nanocomposite hydrogel; adding the Pt/TiO2 cryo-aerogel material, the Pt/g-C3N4 nanocomposites, the PNCH nanocomposite hydrogel, and tetramethylethylenediamine to a solution containing acrylamide, bisacrylamide, and an initiator to obtain a mixed system, and performing a curing reaction of the mixed system to obtain PNCH-Pt/TiO2-g-C3N4 nanocomposites. 2. A method for producing a solid waste capsule for municipal waste incineration fly ash according to claim 1, characterized in that the mass ratio of the acrylamide, the bis-acrylamide, the frozen Pt/TiO2 aerogel material, the Pt/g-C3Na NPs nanocomposite, the PNCH nanocomposite hydrogel, and the PNCH nanocomposite hydrogel in the mixed system is 10-15:0.8:5-8:10-15:12-15. The initiator is added in an amount of 3-8% of the mass of the mixed system, and the tetramethylethylenediamine is added in an amount of 20-25% of the mass of the mixed system. 3. A method for producing a solid waste capsule for municipal waste incineration fly ash according to claim 1, characterized in that the curing reaction is carried out under the following conditions: in a liquid nitrogen atmosphere up to a freezing temperature of 0 °C, with a curing time of 2-4 h. 4. A method for producing a solid waste capsule for municipal waste incineration fly ash according to claim 1, characterized in that in the solution containing chloroplatinic acid and g-C3N4, the mass ratio of chloroplatinic acid and g-C3N4 is 4:15-20. 5. A method for producing a solid waste capsule for municipal waste incineration fly ash according to claim 1, characterized in that in the colloidal solution the mass fraction of Pt nanoparticles is 16.5-17.5% and the mass fraction of TiO2 nanoparticles is 16-18%. 6. A process for producing a solid waste capsule for municipal waste incineration fly ash according to claim 1, characterized in that the initiator is persulfate. 7. A method for producing a solid waste capsule for municipal waste incineration fly ash according to claim 1, characterized in that the mass ratio of N-isopropylacrylamide, N,N'-methylenebisacrylamide, and poly-N,N-2-methylacrylamide in the first mixed solution is 18-20:1:15-16. The concentration of N-isopropylacrylamide is 85-95%; the mass ratio of persulfate to N-allylthiourea in the second mixed solution is 3:3-5, and the mass ratio of N-isopropylacrylamide to N-allylthiourea is 41:150-160. The mass ratio of 2,2-azobis(2-methylpropylimide) dihydrochloride and N-allylthiourea is 41:900-950. 8. Fine solid waste capsule for municipal waste incineration fly ash, characterized in that it is obtained by the manufacturing process claimed in any one of claims 1-7. 9. The use of a solid waste capsule for municipal waste incineration fly ash in the production of a fly ash-based gelling material according to claim 8, characterized in that a solid waste capsule for municipal waste incineration fly ash is added to the fly ash-based gelling material at a mass ratio of 0.5 to 3.0%. 10. The use of a solid waste capsule for municipal waste incineration fly ash in the manufacture of a fly ash-based gelling material according to claim 9, characterized in that the fly ash-based gelling material comprises the following components by weight: 50 to 65 parts municipal waste incineration fly ash, 8 to 12 parts furnace bottom slag, 20 to 25 parts slag, 1 to 5 parts phosphogypsum, 3 to 9 parts alkali irritant, 1 to 3 parts CaCl».