Stabilizing agent for enhanced waste incineration fly ash targeting heavy metals chelation and method of use

Abstract

The application discloses a reinforced garbage incineration fly ash targeted chelation heavy metal stabilizer and a use method thereof, and comprises the following components in percentage by weight: dihydrogen phosphate salt 2-5%, piperazine-1,4-bis potassium dithiocarboxylate 20-45%, carbamate salt ≤0.3%, polyacrylamide ≤0.2%, and water 49.5-78%. The application uses piperazine-1,4-bis potassium dithiocarboxylate and carbamate salt to provide ligands for heavy metal ions, and uses dihydrogen phosphate salt to adjust the acid-base property of fly ash, further promotes the generation of chelates of piperazine-1,4-bis potassium dithiocarboxylate and heavy metal ions, and simultaneously detects the fly ash acid neutralization capacity when the heavy metal stabilizer is used, so as to ensure the applicability of the heavy metal stabilizer and effectively solidify the heavy metals in fly ash.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of environmental protection, and relates to a heavy metal stabilizer for enhancing target chelation of waste incineration fly ash and a use method. BACKGROUND

[0002] Waste incineration fly ash is a fine particle collected in the waste incineration process, which usually contains a large number of heavy metals and a small amount of dioxin, and is therefore listed in the "Hazardous Waste List" code HW18. Fly ash without safe disposal is dangerous to the ecological environment. The most important disposal method at home and abroad is as follows: after the solidified sample of fly ash treated by a heavy metal chelating agent meets the requirements of the "Standard for Pollution Control on Domestic Waste Landfill Sites" shown in Table 1, the fly ash is filled into the landfill.

[0003] (GB16889-2008) and then filled into the landfill.

[0004] Table 1 Limit of leaching toxicity of fly ash chelate

[0005] No. Pollution item Mass concentration limit value (mg / L) 1 Mercury 0.05 2 Copper 40 3 Zinc 100 4 Lead 0.25 5 Cadmium 0.15 6 Beryllium 0.02 7 Barium 25 8 Nickel 0.5 9 Arsenic 0.3 10 Total chromium 4.5 11 Hexavalent chromium 1.5 12 Selenium 0.1

[0006] Due to the instability of the raw materials for waste incineration, the composition of fly ash fluctuates greatly. At present, the composition of the chelating agent on the market is single, and the solidification stability of heavy metals cannot be fully considered when selecting the chelating agent, which leads to the difficulty in achieving stable and standard fly ash solidification. According to the five-step extraction method, the forms of heavy metals are exchangeable ion state, carbonate combined state, iron and manganese oxide combined state, sulfide and organic combined state, and residual state. As shown in Table 2, the s, p and d layers of the outer electron structure of the easily migrating heavy metal ions in fly ash have empty orbitals. Therefore, the types and forms of heavy metal ions in fly ash are the key to the selection of chelating agents.

[0007] Table 2 Outer electron structure of easily over-standard heavy metal ions in fly ash

[0008] Element Belonging group Outer electron structure Zinc, cadmium, mercury Zinc subgroup (n-1)d 10n s 2 ]]> Copper Copper subgroup (n-1)d 10 ns 1 ]]> Lead Carbon group element 6s 2 6p 2 ]]> Nickel Iron series element 3d 8 4s 2 <!-- 1 -->]]> Arsenic Nitrogen group element 4s 2 4p 3 ]]>

[0009] The existing chelating agents include acetic acid series, phosphate series, hydroxyl series, sulfur ammonium series and sodium sulfide series. Different functional groups have different chelation effects on fly ash. The types and characteristics of chelating agents are shown in Table 3. The chelating agent, as a polydentate ligand, forms a chelate with heavy metal ions to form a chelate ring, which is more stable than the complex formed by a single ligand. The stability of the chelate is related to the number and size of the chelate ring. The more the number of chelate rings, the more stable the chelate. In addition, the size of the chelate ring also affects the stability, and the five- and six-membered rings are the most stable.

[0010] Table 3 Types and characteristics of chelating agents

[0011]

[0012] The factors affecting the chelating agent of heavy metals in fly ash are as follows: (1) heavy metal form; (2) other anions and chelating agents in fly ash compete with chelation of heavy metal ions; (3) selection of chelating agent. Therefore, the heavy metal form in fly ash and the physical properties of fly ash itself affect the chelation effect of heavy metals in fly ash.

[0013] Chinese patent publication No. CN105498146A proposes a kind of incineration fly ash double-component heavy metal stabilizer and its fly ash processing method, the stabilizer includes A component and B component, the A component includes the activator of activating alkaline substance and heavy metal in fly ash, the activator is water-soluble ionic surfactant or / and non-ionic surfactant, the B component includes phosphate, organic sulfur and inorganic sulfur;The role of B component in this technology is heavy metal stabilizer;Because the content of alkaline substance in fly ash is too high, it can lead to the existence of lead ion, zinc ion in the form of polyhydroxy ion, so it can also affect the stability effect of heavy metals in fly ash, so it can be seen that the double-component heavy metal stabilizer in this technology is not suitable for fly ash with high content of alkaline substance. SUMMARY

[0014] In view of the above defects in the prior art, the purpose of the present application is to provide a kind of heavy metal stabilizer for strengthening garbage incineration fly ash targeted chelation and use method, adopt the potassium salt of piperazine-1, 4-bis-dithiocarboxylic acid, carbamate as ligand for heavy metal ion, and utilize dihydrogen phosphate to adjust fly ash alkaline, further promote the potassium salt of piperazine-1, 4-bis-dithiocarboxylic acid and heavy metal ion to generate chelate, while embedding the detection of fly ash acid neutralization capacity when heavy metal stabilizer is used, to ensure the applicability of heavy metal stabilizer, effectively solidify heavy metals in fly ash.

[0015] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0016] The present application provides a kind of heavy metal stabilizer for strengthening garbage incineration fly ash targeted chelation, including the following ingredients by weight percentage: dihydrogen phosphate: 2-5%, the potassium salt of piperazine-1, 4-bis-dithiocarboxylic acid: 20-45%, carbamate ≤0.3%, polyacrylamide ≤0.5%, water: 49.5-78%.

[0017] Preferably, the content of the carbamate is 0.1-0.3%, and the content of the polyacrylamide is 0.2-0.5%.

[0018] Preferably, the dihydrogen phosphate is selected from one or more of sodium dihydrogen phosphate, potassium dihydrogen phosphate and ammonium dihydrogen phosphate.

[0019] Preferably, the carbamate is selected from one or both of sodium N,N-dimethyl-carbamate and sodium diethyl dithiocarbamate.

[0020] The second aspect of the present application provides a method for using a reinforced waste incineration fly ash targeted chelated heavy metal stabilizer, comprising the following steps:

[0021] S1, detecting a fly ash sample and obtaining the acid neutralization capacity K of the fly ash;

[0022] S2, when the acid neutralization capacity K of the fly ash is greater than or equal to 5, solidifying the heavy metals in the fly ash by using the reinforced waste incineration fly ash targeted chelated heavy metal stabilizer as described in the first aspect of the present application.

[0023] Preferably, the step S1 comprises the following process:

[0024] S11, drying and finely grinding 50-100g of the fly ash sample to 150 mesh or less;

[0025] S12, adding the finely ground fly ash sample into a sucrose solution, placing it on a magnetic stirrer for reaction, then adding a phenolphthalein indicator, and then using hydrochloric acid titration to record the volume V of the consumed hydrochloric acid. HCl ;

[0026] The acid neutralization capacity K of the fly ash is obtained by the following formula:

[0027] K = V HCl × C HCl / m 飞灰

[0028] In the formula, K is the acid neutralization capacity of the fly ash, with the unit of mmol / g;

[0029] V HCl is the volume of the consumed hydrochloric acid during titration, with the unit of mL;

[0030] C HCl is the molar concentration of the hydrochloric acid used during titration, with the unit of mol / L;

[0031] m 飞灰 is the mass of the fly ash sample used for reaction with the sucrose solution, with the unit of g.

[0032] Preferably, in the step S12, the mass of the fly ash sample is 1±0.05g; the volume of the sucrose solution is 10±0.5ml, and the concentration of the sucrose solution is 30-35g / L.

[0033] Preferably, in the step S2, the addition amount of the heavy metal stabilizer is 2.0%-4.0%.

[0034] The present application has the following beneficial effects:

[0035] 1. The invention adopts piperazine-1, 4-bis potassium dithiocarboxylate, carbamate as heavy metal ion ligand to form a ring structure, which forms stable chelate with lead ions, chromium ions and cadmium ions in fly ash, and further promotes the formation of chelate of piperazine-1, 4-bis potassium dithiocarboxylate and heavy metal ions by using dihydrogen phosphate to adjust the acidity and alkalinity of fly ash.

[0036] 2. The invention optimizes the chelation process of fly ash, detects the fly ash acid neutralization capacity in use, and judges the applicability of the heavy metal stabilizer, so that the chelation of heavy metals in fly ash is no longer blind, and the heavy metals in fly ash can be effectively solidified, and the chelation effect is strengthened. DETAILED DESCRIPTION

[0037] In order to better understand the above technical solutions of the present application, the technical solutions of the present application will be further described below in combination with examples.

[0038] The stability of heavy metal chelation in fly ash needs to consider the characteristics of fly ash itself in addition to its formula, such as the alkaline substances (calcium oxide, calcium hydroxide) contained therein. The anions (OH - ) provided by these alkaline substances can strengthen the chelation effect of heavy metals, because OH - can fill the empty orbit of s, p, d of heavy metals, so that the heavy metals achieve chelation effect. However, excessive OH - further reacts with stable Pb(OH)2, Zn(OH)2 to generate easily migratory [Pb(OH) n ] 2-n , [Zn(OH) n ] 2-n , so that excessive calcium oxide and calcium hydroxide will also affect the chelation effect. Therefore, the present application improves the formula of heavy metal stabilizer and its use method to strengthen the targeted chelation of fly ash from waste incineration.

[0039] The present application provides a heavy metal stabilizer for strengthening the targeted chelation of fly ash from waste incineration, which comprises the following ingredients in percentage by weight: dihydrogen phosphate 2-5%, piperazine-1, 4-bis potassium dithiocarboxylate 20-45%, carbamate ≤0.3%, polyacrylamide ≤0.5%, and water 49.5-78%.

[0040] In a preferred embodiment, the content of carbamate is 0.1-0.3%, and the content of polyacrylamide is 0.2-0.5%.

[0041] In a specific embodiment, the dihydrogen phosphate is selected from one or more of sodium dihydrogen phosphate, potassium dihydrogen phosphate and ammonium dihydrogen phosphate.

[0042] In specific embodiments, the carbamate salt is selected from one or both of N,N-dimethyl-sodium carbamate and sodium diethyldithiocarbamate;

[0043] The potassium piperazine-1,4-bisdithiocarboxylate and the carbamate salt mainly provide ligands for heavy metal ions to form a ring structure, and the substance can form stable chelates with lead ions, chromium ions and cadmium ions. In addition, the carbamate salt can adjust the alkaline conditions in the fly ash to promote the formation of chelates of the potassium piperazine-1,4-bisdithiocarboxylate and heavy metal ions. The polyacrylamide PAM further enhances the flocculation of the heavy metal chelates.

[0044] In the present application, in addition to configuring the components of the heavy metal stabilizer, the chelation of fly ash is also optimized, that is, before use, the physical properties of fly ash (such as the content of internal alkaline substances) are understood and judged through the acid neutralization capacity of fly ash, so as to determine whether to use the heavy metal stabilizer of the present application, so that the chelation of fly ash is no longer blind.

[0045] The use method of the heavy metal stabilizer for reinforced waste incineration fly ash targeted chelation of the present application judges the applicability of the heavy metal stabilizer through embedding fly ash acid neutralization capacity detection, and includes the following steps:

[0046] S1, detecting the fly ash sample and obtaining the acid neutralization capacity K of the fly ash, specifically including the following process:

[0047] S11, drying and finely grinding 50-100g of the fly ash sample to 150 mesh or less;

[0048] Specifically, first, the water content of the fly ash is determined, 50-100g of the fly ash sample is taken in a petri dish and placed in an oven (temperature set to 105℃) to dry to constant weight, and the water content is recorded as w 含水率 %. The above dried fly ash is finely ground using a ball mill to 150 mesh or less.

[0049] S12, after the finely ground fly ash sample is added to the sucrose solution and placed on a magnetic stirrer for reaction, phenolphthalein indicator is added, then hydrochloric acid is titrated, and the volume V HCl of hydrochloric acid consumed is recorded to calculate the acid neutralization capacity K of the fly ash.

[0050] Specifically, 1±0.05g of the finely ground fly ash sample is taken and added to a sucrose solution with a volume of 10±0.5ml, and the concentration of the sucrose solution is 30-35g / L; then it is placed on a magnetic stirrer for reaction for 10±1 minutes, then 2-3 drops of phenolphthalein indicator are added to the solution, and then 0.1mol / L hydrochloric acid is titrated, and the volume V HCl of hydrochloric acid consumed is recorded.

[0051] Since the alkaline substances in the fly ash are mainly calcium oxide and calcium hydroxide, the anion (OH - ) can strengthen the chelation effect of heavy metals, and the reason is that OH - can fill the empty orbit of s, p and d of heavy metals, so that the heavy metals achieve the chelation effect, but too much OH - reacts with stable Pb(OH)2 and Zn(OH)2 to generate easily migratory [Pb(OH) n ] 2-n and [Zn(OH) n ] 2-n Therefore, whether to use the heavy metal stabilizer of the present application is determined according to the content of the alkaline substances in the fly ash, and the content of the alkaline substances in the fly ash can be characterized by the acid neutralization capacity K of the fly ash, and the calculation method is as follows:

[0052] K = V HCl × C HCl / m 飞灰

[0053] In the formula, K is the acid neutralization capacity of the fly ash per unit mass, and the unit is mmol / g;

[0054] V HCl is the volume of hydrochloric acid consumed during titration, and the unit is mL;

[0055] C HCl is the molar concentration of hydrochloric acid used during titration, and the unit is mol / L;

[0056] m 飞灰 is the mass of the fly ash sample used for reaction with sucrose solution, and the unit is g.

[0057] S2, when the acid neutralization capacity K of the fly ash is greater than or equal to 5, the heavy metal stabilizer for enhanced targeted chelation of waste incineration fly ash is used to solidify the heavy metals in the fly ash.

[0058] Specifically, whether to use the heavy metal stabilizer of the present application is determined according to the acid neutralization capacity of the fly ash, when the acid neutralization capacity K of the fly ash is greater than or equal to 5, the heavy metal stabilizer for enhanced targeted chelation of waste incineration fly ash is used to solidify the heavy metals in the fly ash, otherwise, the acid-base property of the fly ash needs to be adjusted, and other heavy metal stabilizers are selected.

[0059] When the heavy metal stabilizer for enhanced targeted chelation of waste incineration fly ash is used, the addition amount is 2.0-4.0% of the mass of the fly ash; the dihydrogen phosphate, the potassium salt of piperazine-1, 4-bis-dithiocarboxylic acid, the carbamate and the polyacrylamide are added to water in proportion, stirred uniformly, then added to the waste incineration fly ash, fully mixed and cured for a period of time.

[0060] The chelated solidified sample obtained after the above maintenance is detected and analyzed, and the heavy metal content in the leaching solution meets the requirements of Table 1 of the Standard for Pollution Control on Domestic Waste Landfill Site GB16889-2008, and can be directly landfilled or treated by other methods.

[0061] The reinforced waste incineration fly ash targeted chelation heavy metal stabilizer and the use method thereof will be further described below in combination with specific examples.

[0062] Example 1

[0063] The waste incineration fly ash in this example comes from the fly ash of a waste power plant in Shanghai, and the water content is 3wt%, and the heavy metal composition of the leaching solution is shown as SH-1-YY in Table 4.

[0064] The reinforced waste incineration fly ash targeted chelation heavy metal stabilizer used in this example includes 5% of sodium dihydrogen phosphate, 20% of piperazine-1, 4-bis potassium dithiocarboxylate, 3% of N, N-dimethyl-sodium carbamate, 0.2% of polyacrylamide, and the rest is water.

[0065] The use method of the above reinforced waste incineration fly ash targeted chelation heavy metal stabilizer is as follows:

[0066] (1) Take 50-100g of fly ash sample in a culture dish, put it in an oven (temperature set to 105℃) and dry to constant weight, and record the water content as 3wt%; grind the above dried fly ash sample to 150 mesh or less using a ball mill:

[0067] (2) Take 1g of the ground fly ash sample and react with 10mL of 30g / L sucrose solution, and place it on a magnetic stirrer for 10 minutes; after 10 minutes, add 2-3 drops of phenolphthalein indicator to the solution, then titrate with 0.1mol / L hydrochloric acid, and record the volume of hydrochloric acid consumed V HCl =80ml, and calculate the acid neutralization capacity K of the fly ash =V HCl ×C HCl / m 飞灰 =80*0.1 / 1=8mmol / g.

[0068] (3) Since the acid neutralization capacity K of the fly ash is >5, the reinforced waste incineration fly ash targeted chelation heavy metal stabilizer of this example is used to solidify the heavy metals in the fly ash, i.e. adding 0.50%, 1.00%, 1.50% and 2.00% of the mass of the heavy metal stabilizer to the fly ash, to obtain four chelated solidified samples, and the heavy metal composition of the leaching solution is shown as SH-1-1, SH-1-2, SH-1-3, SH-1-4 in Table 4.

[0069] Compared with SH-1-YY before chelation treatment, the leaching solution of fly ash treated by the heavy metal stabilizer of the embodiment does not contain Zn and Ba, and the content of Pb in the leaching solution decreases with the increase of the amount of the heavy metal stabilizer.

[0070] The chelated solidified sample treated in the embodiment meets the requirements of Table 1 "Landfill Site Pollution Control Standard for Domestic Waste" GB16889-2008, and can be directly landfilled or treated by other methods.

[0071] Table 4: Amount of heavy metal stabilizer added and content of heavy metal in leaching solution (wt%)

[0072]

[0073] Example 2

[0074] The fly ash of waste incineration in the embodiment is from a fly ash of a waste power plant in Guangdong, and the water content is 2wt%. The heavy metal components in the leaching solution are shown in Table 5 as GZ-1-YY.

[0075] The heavy metal stabilizer for targeted chelation of reinforced waste incineration fly ash used in the embodiment includes 5% ammonium dihydrogen phosphate, 30% potassium piperazine-1, 4-bis dithiocarboxylate, 0.2% sodium diethyl dithiocarbamate, 0.5% polyacrylamide, and the balance is water.

[0076] The use method of the heavy metal stabilizer for targeted chelation of reinforced waste incineration fly ash is as follows:

[0077] (1) Take 50-100g of fly ash sample in a petri dish, and place it in an oven (temperature set to 105°C) to dry to constant weight, and record the water content as 2wt%. Grind the dried fly ash sample to 150 mesh or less using a ball mill:

[0078] (2) Take 1g of the ground fly ash sample and react with 10mL of 30g / L sucrose solution, and place it on a magnetic stirrer for 10 minutes. After 10 minutes, add 2-3 drops of phenolphthalein indicator to the solution, and then titrate with 0.1mol / L hydrochloric acid, and record the volume of hydrochloric acid consumed V HCl =120ml, and calculate the acid neutralization capacity K of the fly ash =V HCl ×C HCl / m 飞灰 =120*0.1 / 1=12mmol / g.

[0079] (3) Since the acid neutralization capacity K of the fly ash is greater than 5, the heavy metal stabilizer used in this embodiment is used to target chelation of the heavy metals in the reinforced fly ash from waste incineration, i.e., 1.50%, 2.00%, 2.5%, and 3.0% of the heavy metal stabilizer by mass is added to the fly ash to obtain four chelation and solidification samples, and the heavy metal components in the leachate are shown in Table 5 as GZ-1-1, GZ-1-2, GZ-1-3, and GZ-1-4.

[0080] Compared with GZ-1-YY before chelation and treatment, after the fly ash is treated with the heavy metal stabilizer in this embodiment, Cu and Zn are not found in the leachate, and the Pb, Ba, and Cr in the leachate are also reduced with the increase of the amount of the heavy metal stabilizer.

[0081] The chelation and solidification samples after treatment in this embodiment meet the requirements of Table 1 “Standard for Pollution Control on Domestic Waste Landfill Sites” GB16889-2008, and can be directly landfilled or treated by other methods.

[0082] Table 5: Amount of heavy metal stabilizer added and content of heavy metals in leachate (wt%)

[0083]

[0084] Example 3

[0085] The fly ash from waste incineration in this embodiment is from a fly ash of a waste power plant in Shanghai, and the water content is 2wt%, and the heavy metal components in the leachate are shown in Table 6 as SH-2-YY.

[0086] The heavy metal stabilizer used in this embodiment for target chelation of the reinforced fly ash from waste incineration includes 5% potassium dihydrogen phosphate, 40% piperazine-1, 4-bis potassium dithiocarboxylate, 0.3% sodium diethyl dithiocarbamate, 0.5% polyacrylamide, and the balance is water.

[0087] The use method of the heavy metal stabilizer for target chelation of the reinforced fly ash from waste incineration is as follows:

[0088] (1) Take 50-100g of fly ash sample in a petri dish, and place it in an oven (temperature set to 105°C) to dry to constant weight, and record the water content as 2wt%; grind the dried fly ash sample to 150 mesh or less using a ball mill:

[0089] (2) Take 1g of the ground fly ash sample and react it with 10mL of 30g / L sucrose solution, and place it on a magnetic stirrer for 10 minutes; after 10 minutes, add 2-3 drops of phenolphthalein indicator to the solution, and then titrate with 0.1mol / L hydrochloric acid, and record the volume of hydrochloric acid consumed V HCl = 50ml, and calculate the acid neutralization capacity K of the fly ash = V HCl × CHCl / m 飞灰 = 0.1 * 50 / 1 = 5 mmol / g.

[0090] (3) Since the acid neutralization capacity K of the fly ash is greater than or equal to 5, the heavy metal stabilizer of the present embodiment is used to target and chelate the heavy metals in the fly ash, i.e., 0.50% and 1.00% of the heavy metal stabilizer by mass is added to the fly ash, and two chelated and solidified samples are obtained, and the heavy metal components in the leaching solution are shown in Table 6 as SH-2-1 and SH-2-2.

[0091] Compared with SH-2-YY before chelation, no Cu is found in the leaching solution after the fly ash is treated by the heavy metal stabilizer of the present embodiment, and the contents of Pb, Cd, Zn, Ba and Cr are reduced with the increase of the amount of the heavy metal stabilizer.

[0092] The chelated and solidified samples after the treatment of the present embodiment meet the requirements of Table 1 of the Standard for Pollution Control on Domestic Waste Landfill Site GB16889-2008, and can be directly filled or treated by other methods.

[0093] Table 6: Amount of heavy metal stabilizer added and content of heavy metal in leaching solution (wt%)

[0094]

[0095] In combination with the embodiments 1-3, the present application uses the potassium salt of piperazine-1, 4-bis-dithiocarboxylic acid and the carbamate salt to provide ligands for heavy metal ions, and uses the dihydrogen phosphate to adjust the acidity and alkalinity of the fly ash, to further promote the formation of chelates of the potassium salt of piperazine-1, 4-bis-dithiocarboxylic acid and heavy metal ions, and to detect the acid neutralization capacity of the fly ash when the heavy metal stabilizer is used, to understand and judge the physical properties of the fly ash, so as to determine whether to use the heavy metal stabilizer of the present application, so that the chelation operation of the fly ash is no longer blind, and the heavy metals in the fly ash are effectively solidified.

[0096] Those skilled in the art in this technical field should recognize that the above embodiments are only used to illustrate the present application, and are not used as a limitation on the present application, and as long as the variations and modifications of the above described embodiments are within the scope of the spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A method for using a heavy metal stabilizer that enhances targeted chelation of fly ash from waste incineration, characterized in that, Includes the following steps: S1, Detect fly ash samples and obtain the acid neutralization capacity K of fly ash; Step S1 includes the following process: S11, after drying 50-100g of fly ash sample, grind it to below 150 mesh; S12, the finely ground fly ash sample was added to the sucrose solution, reacted on a magnetic stirrer, phenolphthalein indicator was added, and then titrated with hydrochloric acid. The volume V of hydrochloric acid consumed was recorded. HCl ; The acid neutralization capacity K of the fly ash is obtained by the following formula: K=V HCl ×C HCl / m 飞灰 In the formula, K is the acid neutralization capacity of fly ash, and the unit is mmol / g; V HCl The volume of hydrochloric acid consumed during titration, expressed in mL; C HCl This represents the molar concentration of hydrochloric acid used in the titration, expressed in mol / L. m 飞灰 The mass of the fly ash sample used in the reaction with sucrose solution is expressed in grams. S2, when the acid neutralization capacity K of fly ash is ≥5, heavy metals in fly ash are solidified using a heavy metal stabilizer that enhances targeted chelation of waste incineration fly ash. The heavy metal stabilizer for enhanced targeted chelation of fly ash from waste incineration comprises the following components by weight percentage: dihydrogen phosphate: 2-5%, piperazine-1,4-bisdithiocarboxylate potassium salt: 20-45%, carbamate ≤0.3%, polyacrylamide ≤0.2%, and water: 49.5-78%. In step S2, the amount of heavy metal stabilizer added is 1.0% to 4.0%.

2. The method of using the heavy metal stabilizer for enhanced targeted chelation of waste incineration fly ash according to claim 1, characterized in that, In step S12, the mass of the fly ash sample is 1 ± 0.05 g; the volume of the sucrose solution is 10 ± 0.5 ml, and the concentration of the sucrose solution is 30–35 g / L.

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