Chelating agent and method for treating thallium-containing metal pollutants

Abstract

The invention provides a chelating agent and method for treating thallium-containing metal pollutants, and belongs to the technical field of environmental protection governance, the chelating agent mainly comprises the following components by weight: 1%-90% of at least one of piperazine and derivatives thereof; 1% to 90% of O, O-diisopropyl ammonium dithiophosphate; 1% to 90% of 2, 3-dimercaptosuccinic acid; 1%-90% of calcium polysulfide; 1% to 90% of 3-chloro-2-hydroxypropyl trimethyl ammonium chloride; the balance is a solvent; all the components are uniformly mixed in proportion to form a powdery solid mixture, and then the powdery solid mixture is dissolved in a solvent and uniformly stirred to prepare the chelating agent. Adding the chelating agent into a liquid thallium-containing metal pollutant, and stirring to react until a precipitate is separated out; discharging supernate; and filtering the precipitate, and drying to obtain thallium salt crystals. The invention provides the organic chelating agent which can efficiently degrade thallium-containing metal pollutants and is simple in process, the treatment process is simple, the occupied area is small, the treatment speed is high, and chelating degradation of thallium and other pollutants can be achieved within 1 h.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental protection management, and particularly relates to a chelating agent and a method for treating thallium-containing metal pollutants. Background Art

[0002] Thallium is a rare metal, and its compounds are widely used in electronics, military industry, aerospace, chemical industry, metallurgy, communications and other fields. It has potential application value in optical fibers, radiation scintillators, optical transmittances, radiation shielding materials, catalysts and superconducting materials.

[0003] At present, the main forms of thallium metal pollutants include smelting acid wastewater and smelting waste slag. The thallium content in the sludge / waste slag after sulfide precipitation is about 1%-5%, which has a high recovery value. In view of this, it is necessary to provide a method for recovering thallium from thallium-containing solid waste and waste liquid; its treatment methods include the following two categories:

[0004] (1) A method for recovering thallium from smelting acidic wastewater to prepare thallium chloride or thallium iodide. However, the main treatment method at present is to add sulfide precipitate to the smelting acidic wastewater and convert it into heavy metal sulfide sludge for fixation. Therefore, how to render the heavy metal sulfide sludge obtained by adding sulfide precipitate to the smelting acidic wastewater harmless is a problem to be solved by the present invention.

[0005] (2) A method for preparing thallium iodide using smelting waste as raw material. However, the characteristics of different valence states of thallium and the differences in properties between other heavy metal compounds are not utilized, and the different valence states of thallium need to be adjusted continuously, resulting in a complicated process.

[0006] Organic chelating agents are currently important reagents for treating metal pollutants. They have the advantages of low cost and low treatment efficiency. For example, the organic chelating agent composed of sodium disulphide and its derivatives + hydroxyoxime + dialkyl dithiophosphate can treat thallium-containing metal pollutants of different concentrations with a removal rate of 99%. However, after forming a metal complex with the metal, a flocculant needs to be added to precipitate the metal, which increases the process steps.

[0007] In view of this, there is an urgent need for an organic chelating agent that can efficiently degrade thallium-containing metal pollutants and has a simple pollutant treatment process. Summary of the invention

[0008] In view of this, the object of the present invention is to provide a chelating agent and method for treating thallium metal pollutants, aiming to solve at least one technical problem in the background technology.

[0009] The present invention is achieved in that:

[0010] The first aspect of the present invention provides a chelating agent for treating thallium-containing metal pollutants, wherein the chelating agent comprises the following components in weight percentage:

[0011] Component A 1% to 90%, wherein component A is at least one of piperazine and its derivatives;

[0012] Component B 1% to 90%, wherein component B is O,O-diisopropyl dithiophosphate amine;

[0013] Component C 1% to 90%, wherein component C is 2,3-dimercaptosuccinic acid;

[0014] Component D 1% to 90%, wherein component D is calcium polysulfide;

[0015] Component E 1% to 90%, wherein component E is 3-chloro-2-hydroxypropyltrimethylammonium chloride;

[0016] The balance is solvent;

[0017] Wherein, the thallium metal pollutants include wastewater and / or sludge containing at least thallium ions;

[0018] The preparation method of the chelating agent is as follows: component A, component B, component C, component D and component E are mixed evenly according to proportion to form a powdery solid mixture, and then dissolved in a solvent and stirred evenly to obtain the chelating agent.

[0019] Furthermore, the chelating agent comprises the following components in weight percentage:

[0020] Component A 1.2% to 1.8%;

[0021] Component B 5% to 8%;

[0022] Component C 3% to 7%;

[0023] Component D 6% to 8%;

[0024] Component E 10% to 20%;

[0025] The balance is solvent; the solvent is water.

[0026] The second aspect of the present invention provides a method for treating thallium-containing metal pollutants, using the above-mentioned chelating agent for treating thallium-containing metal pollutants.

[0027] Furthermore, the method is specifically as follows: adding the chelating agent for treating thallium metal pollutants according to claim 1 or 2 to liquid thallium metal pollutants, stirring the reaction until precipitation occurs; discharging the supernatant; filtering and drying the precipitate to obtain thallium salt crystals.

[0028] Furthermore, when the thallium-containing metal pollutant is wastewater containing at least thallium ions, the wastewater is a liquid thallium-containing metal pollutant;

[0029] When the thallium metal pollutant contains sludge containing at least thallium ions, the sludge is ball-milled and then stirred and mixed evenly with water. The resulting mixture is hydrothermally treated at a temperature of 60°C to 140°C under stirring conditions, and the solid-liquid is separated to obtain a thallium extract and leaching residue. The thallium extract is the liquid thallium metal pollutant.

[0030] Furthermore, a curing agent and an oxidizing agent are added to the leached residue to stir and react, and then solid-liquid separation is performed to obtain stable bottom residue and liquid.

[0031] Furthermore, the solid-liquid ratio of the sludge and water is 1kg:(2L-10L); the pH is controlled at 7-8 during the hydrothermal treatment, and the time is 1h-24h.

[0032] Furthermore, the thallium-containing metal pollutant also includes other metal ions and / or metal oxides and / or anions; the method simultaneously removes thallium, other metal ions and / or metal oxides and / or anions.

[0033] Furthermore, the metal in the other metal ions and metal oxides is at least one of Pb, Cd, As, Zn, Cu, Hg, Ca, Mg, and Fe;

[0034] The anion is SO4 2- , Cl - 、F - 、CO3 2- At least one of .

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The organic chelating agent of the present invention can efficiently degrade thallium-containing metal pollutants, and the treatment process is simple, the site occupancy is small, the processing speed is fast, and the chelation degradation of thallium and other pollutants can be achieved within a few minutes.

[0037] 2. The organic chelating agent of the present invention is a multi-component composite formula, each component has complementary advantages and a synergistic effect, which can effectively remove thallium, and can also achieve deodorization, degradation of organic matter, and other metal cations (such as Pb 2+ 、Cd 2+ 、As 2+ 、Zn 2 + , Cu 2+ , Hg 2+ , Ca 2+ Mg 2+ etc.) and anions (such as SO4 2- , Cl - 、F - 、CO3 2- etc.) and other functions.

[0038] 3. The organic chelating agent of the present invention can be used to treat pollutants containing thallium and other heavy metals at different concentrations, high, medium and low, and can quickly and thoroughly treat and resolve them without the need for quality and stage separation, thus saving factory investment.

[0039] 4. The organic chelating agent of the present invention has a wide range of applications and can be used for different industrial wastewaters, such as mining, ore dressing, metallurgy, chemical acidic and alkaline wastewaters; electroplating, electronics and other wastewaters containing heavy metals. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific implementation cases described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] This embodiment is a chelating agent for treating thallium-containing metal pollutants, wherein the thallium-containing metal pollutants include wastewater and / or sludge containing at least thallium ions.

[0042] The chelating agent mainly includes the following components in weight percentage:

[0043] Component A 1% to 90%, which is at least one of piperazine and its derivatives;

[0044] Component B 1% to 90%, which is O,O-diisopropyl dithiophosphate amine;

[0045] Component C 1% to 90%, which is 2,3-dimercaptosuccinic acid;

[0046] Component D 1% to 90%, which is calcium polysulfide;

[0047] Component E 1% to 90%, which is 3-chloro-2-hydroxypropyltrimethylammonium chloride;

[0048] The balance is solvent;

[0049] Component A, component B, component C, component D and component E are mixed uniformly in proportion to form a powdery solid mixture, which is then dissolved in a solvent and stirred uniformly to obtain the chelating agent.

[0050] Preferably, the chelating agent comprises the following components in weight percentage: component A 1.2% to 1.8%; component B 5% to 8%; component C 3% to 7%; component D 6% to 8%; component E 10% to 20%; and the balance is solvent water.

[0051] Among them, piperazine and its derivatives function to form highly stable chelates with a variety of heavy metals such as lead, lead, nickel, copper, and thallium;

[0052] The role of O,O-diisopropyl dithiophosphate is to maintain the stability of heavy metal chelates;

[0053] The role of 2,3-dimercaptosuccinic acid is to form highly stable chelates with metals such as lead, mercury, arsenic, nickel, and copper;

[0054] The role of calcium polysulfide is to form highly stable chelates with metals such as lead, mercury, arsenic, nickel, and copper;

[0055] 3-Chloro-2-hydroxypropyltrimethylammonium chloride acts as a cationic flocculating and settling agent;

[0056] Synergistic mechanism: After adding the chelating agent, piperazine and its derivatives, 2,3-dimercaptosuccinic acid and calcium polysulfide selectively chelate with heavy metals in thallium-containing pollutants, O,O-diisopropyldithiophosphate is responsible for maintaining the stability of the heavy metal chelate, and then 3-chloro-2-hydroxypropyltrimethylammonium chloride flocculates and settles the heavy metal chelate, which can be removed from the water.

[0057] Example 1

[0058] In this embodiment, heavy metal sulfide sludge obtained by adding sulfide to smelting acid wastewater is used as the thallium-containing pollutant. After measurement, the sludge contains the following heavy metal components in percentage by weight: 3% thallium, 10% lead, 7% cadmium, and 3% zinc. A method for treating thallium-containing pollutants includes the following steps:

[0059] S1. Prepare a chelating agent, which comprises, by weight percentage, 1.5% piperazine, 7% O,O-diisopropyl dithiophosphate ammonium, 5% 2,3-dimercaptosuccinic acid, 7% calcium polysulfide, 15% 3-chloro-2-hydroxypropyltrimethylammonium chloride, and the balance is water; and mix the components uniformly to form a chelating agent;

[0060] S2. Sludge pretreatment: The sludge was ball-milled and then mixed with water at a liquid-solid ratio of 1kg:6L, and the resulting mixture was hydrothermally treated at 100°C for 12 hours under stirring conditions. The pH value was controlled at 7-8 during the hydrothermal treatment. After the reaction was completed, the solid and liquid were separated to obtain a thallium extract and leached residue. The metal ion content in the thallium extract was measured, and the results are shown in Table 1.

[0061] S3, adding the chelating agent obtained in step S1 to the thallium extract, wherein the mass ratio of the thallium content in the thallium extract to the chelating agent is 1:15, stirring the reaction until precipitation occurs; discharging the supernatant; filtering and drying the precipitate to obtain thallium salt crystals; measuring the metal ion content in the supernatant, and the results are shown in Table 1;

[0062] S4, adding a curing agent and an oxidant to the leached residue obtained in step S2, stirring and reacting, and then performing solid-liquid separation to obtain stable bottom residue and liquid.

[0063] Example 2

[0064] This example is a method for treating thallium-containing metal pollutants, which differs from Example 1 in that the weight percentage of piperazine in component A is 1.2%. The results of the chelating agent of this example in removing metal ions in the same wastewater system are shown in Table 1.

[0065] Example 3

[0066] This example is a method for treating thallium-containing metal pollutants, which differs from Example 1 in that the weight percentage of piperazine in component A is 1.8%. The results of removing metal ions by the chelating agent of this example in the same wastewater system are shown in Table 1.

[0067] Example 4

[0068] This example is a method for treating thallium-containing metal pollutants, which differs from Example 1 in that the weight percentage of component B: O,O-diisopropyl dithiophosphate amine is 5%. The results of removing metal ions by the chelating agent of this example in the same wastewater system are shown in Table 1.

[0069] Example 5

[0070] This example is a method for treating thallium-containing metal pollutants, which differs from Example 1 in that the weight percentage of component B: O,O-diisopropyl dithiophosphate amine is 8%. The results of the chelating agent of this example in removing metal ions in the same wastewater system are shown in Table 1.

[0071] Example 6

[0072] This example is a method for treating thallium-containing metal pollutants, which differs from Example 1 in that the weight percentage of component C: 2,3-dimercaptosuccinic acid is 3%. The results of the chelating agent of this example in removing metal ions in the same wastewater system are shown in Table 1.

[0073] Example 7

[0074] This example is a method for treating thallium-containing metal pollutants, which differs from Example 1 in that the weight percentage of component C: 2,3-dimercaptosuccinic acid is 7%. The results of the chelating agent of this example in removing metal ions in the same wastewater system are shown in Table 1.

[0075] Example 8

[0076] This example is a method for treating thallium-containing metal pollutants, which differs from Example 1 in that the weight percentage of component D: calcium polysulfide is 6%. The results of the chelating agent of this example in removing metal ions in the same wastewater system are shown in Table 1.

[0077] Example 9

[0078] This example is a method for treating thallium-containing metal pollutants, which differs from Example 1 in that the weight percentage of component D: calcium polysulfide is 8%. The results of the chelating agent of this example in removing metal ions in the same wastewater system are shown in Table 1.

[0079] Example 10

[0080] This example is a method for treating thallium-containing metal pollutants, which differs from Example 1 in that the weight percentage of component E: 3-chloro-2-hydroxypropyltrimethylammonium chloride is 10%. The results of the chelating agent of this example in removing metal ions in the same wastewater system are shown in Table 1.

[0081] Embodiment 11

[0082] This embodiment is a method for treating thallium-containing metal pollutants, which differs from Embodiment 1 in that the weight percentage of component E: 3-chloro-2-hydroxypropyltrimethylammonium chloride is 20%. The results of the chelating agent of this embodiment in removing metal ions in the same wastewater system are shown in Table 1.

[0083] Table 1

[0084]

[0085] It can be seen from the data in Table 1 that the chelating agent of the embodiment of the present invention can remove multiple metal ions simultaneously in the sludge system, and the removal efficiency can be as high as more than 99%;

[0086] Compared with Example 1, Example 2 reduces the content of component A, and Example 3 increases the content of component A. It can be seen from the data in Table 1 that as the content of component A (piperazine) increases, the removal effect of metal ions is enhanced, and as the content increases to a certain amount, the subsequent removal effect is not significantly enhanced.

[0087] Compared with Example 1, Example 4 reduces the content of component B, and Example 5 increases the content of component B. It can be seen from the data in Table 1 that as the content of component B (O,O-diisopropyl dithiophosphate) increases, the removal effect of metal ions is enhanced, and as the content increases to a certain amount, the subsequent removal effect is not significantly enhanced.

[0088] Compared with Example 1, Example 6 reduces the content of component C, and Example 7 increases the content of component C. It can be seen from the data in Table 1 that as the content of component C (2,3-dimercaptosuccinic acid) increases, the removal effect of metal ions is enhanced, and as the content increases to a certain amount, the subsequent removal effect is not significantly enhanced.

[0089] Compared with Example 1, Example 8 reduces the content of component D, and Example 9 increases the content of component D. It can be seen from the data in Table 1 that as the content of component D (calcium polysulfide) increases, the removal effect of metal ions is enhanced, and as the content increases to a certain amount, the subsequent removal effect is not significantly enhanced.

[0090] Compared with Example 1, Example 10 reduces the content of component D, and Example 11 increases the content of component E. It can be seen from the data in Table 1 that as the content of component E (3-chloro-2-hydroxypropyltrimethylammonium chloride) increases, the removal effect of metal ions is enhanced, but when the content increases to a certain extent, the removal effect remains balanced and no longer increases.

[0091] Example 12

[0092] In this embodiment, wastewater generated in the zinc smelting process is treated as thallium-containing pollutants. The method for treating thallium-containing pollutants includes the following steps:

[0093] S1. Prepare a chelating agent, which comprises, by weight percentage, 1.5% piperazine, 7% O,O-diisopropyl dithiophosphate ammonium, 5% 2,3-dimercaptosuccinic acid, 7% calcium polysulfide, 15% 3-chloro-2-hydroxypropyltrimethylammonium chloride, and the balance is water; and mix the components uniformly to form a chelating agent;

[0094] S2. Adjust the pH of the wastewater to 7-8, add the chelating agent prepared in step S1, the mass ratio of smelting wastewater to the chelating agent is 15:1, stir and react until precipitation occurs; discharge the supernatant; filter and dry the precipitate to obtain thallium salt crystals; measure the metal ion content in the supernatant, and the results are shown in Table 2.

[0095] Table 2

[0096] Total Thallium Lead CadmiumCd Zinc Iron Copper Arsenic Before treatment (mg / L) 4.368 6.237 5.564 3.426 1.258 5.512 1.249 After treatment (mg / L) 0.033 0.152 0.095 0.042 0.063 0.247 0.105 Removal rate / % 99.24 97.56 98.29 98.77 94.99 95.52 91.59

[0097] It can be seen from the data in Table 2 that the chelating agent of the embodiment of the present invention can simultaneously remove multiple metal ions in the metal smelting wastewater system, and the thallium removal rate can be as high as 99% or more, and the removal rates of other metals are above 91%;

[0098] Example 13

[0099] This example uses simulated comprehensive sewage containing thallium, other metals, and anion pollutants as the treatment object, the composition of which is shown in Table 3, and the treatment method includes the following steps:

[0100] S1. Prepare a chelating agent, which comprises, by weight percentage, 1.5% piperazine, 7% O,O-diisopropyl dithiophosphate ammonium, 5% 2,3-dimercaptosuccinic acid, 7% calcium polysulfide, 15% 3-chloro-2-hydroxypropyltrimethylammonium chloride, and the balance is water; and mix the components uniformly to form a chelating agent;

[0101] S2. Adjust the pH value of the wastewater to 7-8, add the chelating agent prepared in step S1, the mass ratio of wastewater to chelating agent is 15:1, stir and react until precipitation occurs; discharge the supernatant; filter and dry the precipitate to obtain thallium salt crystals; measure the metal ion and anion content in the supernatant, and the results are shown in Table 3.

[0102] Table 3

[0103] Before treatment (mg / L) After treatment (mg / L) Removal rate / % Tl 3.22 0.03 99.19 Pb 1.86 0.08 95.85 Cd 1.23 0.07 93.98 Zn 1.35 0.02 98.59 Fe 0.57 0.01 97.71 Cu 1.42 0.08 94.10 As 0.24 0.02 91.67 Hg 0.13 0.01 92.31 Ca 2.27 0.15 93.30 Mg 2.04 0.11 94.74 <![CDATA[SO4 2- ]]> 1.2 0.13 89.59 <![CDATA[Cl - ]]> 1.64 0.14 91.56 <![CDATA[F - ]]> 1.02 0.15 84.90 <![CDATA[CO3 2- ]]> 1.85 0.20 89.21

[0104] It can be seen from the data in Table 3 that the chelating agent of the embodiment of the present invention can simultaneously remove total thallium and Pb in the same wastewater system. 2+ 、Cd 2+ 、As 2+ 、Zn 2+ , Cu 2+ , Hg 2+ , Ca 2+ Mg 2+ And other metal ions, it can also remove metal oxides, anions (SO4 2- , Cl - 、F - 、CO3 2- )wait.

[0105] Comparative Example 1

[0106] This comparative example is a method for treating thallium-containing metal pollutants. The difference between this comparative example and Example 1 is that there is no component A in the chelating agent. The other steps and parameters are the same as those in Example 1. The treatment results are shown in Table 4.

[0107] Comparative Example 2

[0108] This comparative example is a method for treating thallium-containing metal pollutants. The difference between this comparative example and Example 1 is that there is no component B in the chelating agent. The other steps and parameters are the same as those in Example 1. The treatment results are shown in Table 4.

[0109] Comparative Example 3

[0110] This comparative example is a method for treating thallium-containing metal pollutants. The difference between this comparative example and Example 1 is that there is no component C in the chelating agent. The other steps and parameters are the same as those in Example 1. The treatment results are shown in Table 4.

[0111] Comparative Example 4

[0112] This comparative example is a method for treating thallium-containing metal pollutants. The difference between this comparative example and Example 1 is that there is no component D in the chelating agent. The other steps and parameters are the same as those in Example 1. The treatment results are shown in Table 4.

[0113] Comparative Example 5

[0114] This comparative example is a method for treating thallium-containing metal pollutants. The difference between this comparative example and Example 1 is that there is no component E in the chelating agent. The other steps and parameters are the same as those in Example 1. The treatment results are shown in Table 4.

[0115] Table 4

[0116]

[0117] It can be seen from the data in Table 4 that removing any one of component A, component B, component C, component D, and component E in the organic chelating agent of the present invention will reduce the treatment effect of thallium; wherein removing any one of component A, component B, component C, and component D will also lead to a significant reduction in the removal effect of lead, cadmium, and zinc. After removing component E, the removal effect of total thallium, lead, cadmium, and zinc is slightly reduced.

[0118] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A chelating agent for treating thallium-containing metal pollutants, characterized in that: The chelating agent comprises the following components in weight percentage: Component A 1% to 90%, wherein component A is at least one of piperazine and its derivatives; Component B 1% to 90%, wherein component B is O,O-diisopropyl dithiophosphate amine; Component C 1% to 90%, wherein component C is 2,3-dimercaptosuccinic acid; Component D 1% to 90%, wherein component D is calcium polysulfide; Component E 1% to 90%, wherein component E is 3-chloro-2-hydroxypropyltrimethylammonium chloride; The balance is solvent; Wherein, the thallium metal pollutants include wastewater and / or sludge containing at least thallium ions; The preparation method of the chelating agent is as follows: component A, component B, component C, component D and component E are mixed evenly according to proportion to form a powdery solid mixture, and then dissolved in a solvent and stirred evenly to obtain the chelating agent.

2. A chelating agent for treating thallium-containing metal pollutants according to claim 1, characterized in that: The chelating agent comprises the following components in weight percentage: Component A 1.2% to 1.8%; Component B 5% to 8%; Component C 3% to 7%; Component D 6% to 8%; Component E 10% to 20%; The balance is solvent; the solvent is water.

3. A method for treating thallium-containing metal pollutants, characterized in that: The chelating agent for treating thallium metal-containing pollutants as claimed in claim 1 or 2 is used.

4. A method for treating thallium-containing metal pollutants according to claim 3, characterized in that: The method specifically comprises: adding the chelating agent for treating thallium-containing metal pollutants as claimed in claim 1 or 2 to liquid thallium-containing metal pollutants, stirring the reaction until precipitation occurs; discharging the supernatant; filtering and drying the precipitate to obtain thallium salt crystals; wherein the amount of the chelating agent used ranges from 1% to 10% of the thallium-containing metal pollutants.

5. A method for treating thallium-containing metal pollutants according to claim 4, characterized in that: When the thallium metal pollutant is wastewater containing at least thallium ions, the wastewater is a liquid thallium metal pollutant; When the thallium metal pollutant contains sludge containing at least thallium ions, the sludge is ball-milled and then stirred and mixed evenly with water. The resulting mixture is hydrothermally treated at a temperature of 60°C to 140°C under stirring conditions, and the solid-liquid is separated to obtain a thallium extract and leaching residue. The thallium extract is the liquid thallium metal pollutant.

6. A method for treating thallium-containing metal pollutants according to claim 5, characterized in that: A curing agent and an oxidizing agent are added to the leached residue to stir and react, and then solid-liquid separation is performed to obtain stable bottom residue and liquid.

7. A method for treating thallium-containing metal pollutants according to claim 5, characterized in that: The solid-liquid ratio of the sludge and water is 1kg:(2L-10L); the pH is controlled at 7-8 during the hydrothermal treatment, and the time is 1h-24h.

8. A method for treating thallium-containing metal pollutants according to claim 6, characterized in that: The curing agent is at least one of K3PO4 and Na2SiO3 or a combination of two thereof; the oxidizing agent is hydrogen peroxide.

9. A method for treating thallium-containing metal pollutants according to any one of claims 3 to 8, characterized in that: The thallium-containing metal pollutants also include other metal ions and / or metal oxides and / or anions; the method removes thallium, other metal ions and / or metal oxides and / or anions simultaneously.

10. A method for treating thallium-containing metal pollutants according to claim 9, characterized in that: The metal in the other metal ions and metal oxides is at least one of Pb, Cd, As, Zn, Cu, Hg, Ca, Mg, and Fe; the anion is SO4 2- , Cl - 、F - 、CO3 2- At least one of .

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