Iron modified calcium-aluminum compound as well as preparation method and application thereof

Abstract

The invention discloses an iron-modified calcium-aluminum compound as well as a preparation method and application thereof. The preparation method of the iron-modified calcium-aluminum compound comprises the following steps: mixing a calcium source, an aluminum source and an iron source, and calcining, wherein the molar ratio of Ca to Al in the calcium source and the aluminum source is (1-1.3): 1, and the ratio of the total mass of the calcium source and the aluminum source to the mass of iron ions in the iron source is 1: (0.01-50). The calcium-aluminum compound is modified through iron doping, and when the calcium-aluminum compound is applied to desulfurization wastewater treatment, the removal efficiency of chlorine / thallium ions can be remarkably improved, the use amount of iron-modified mayenite can be reduced, and then the cost is reduced. Meanwhile, the obtained chlorine / thallium removal product has excellent removal rate on carbonyl sulfide and hydrogen sulfide.

Description

Technical Field

[0001] The invention relates to an iron-modified calcium-aluminum compound and a preparation method and application thereof, belonging to the technical field of environmental governance. Background Art

[0002] High chloride levels in industrial desulfurization wastewater pose a serious threat to the ecological environment. If discharged without proper treatment, this wastewater will widely contaminate water sources, profoundly impacting agriculture, fisheries, and forestry. It may also seep into groundwater, causing further pollution. Water with excessive chloride levels is not only highly corrosive, damaging metal pipes and building structures, but can also cause soil hardening and salinization upon seepage into the soil, potentially leading to animal and human poisoning. Studies have shown that chloride ion concentrations in water reaching 1500 mg / L are harmful to livestock health, while concentrations exceeding 4000 mg / L can cause death. Therefore, finding and implementing effective methods to remove chloride ions from water is crucial and urgent.

[0003] Thallium is an extremely toxic and dangerous heavy metal, significantly more toxic than elements such as lead, cadmium, arsenic, and mercury. Thallium levels in natural waters were originally very low. However, with the rapid advancement of modern industry, large amounts of thallium have been released into the environment through mining and metal smelting, leading to frequent thallium poisoning incidents and environmental pollution. Thallium not only harms the growth of plants and animals but can also enter the human body through various pathways, including the water cycle, the food chain, and respiration, where it gradually accumulates, causing disease and even fatal consequences, posing a serious threat to human health.

[0004] Calcium aluminum 12 Al 14 O 33 ), as a functional material in the CaO-Al2O3 binary system, it exhibits a unique cage-like crystal structure, and because of its good room temperature stability and the characteristics of easy doping with a variety of metal ions, it has the potential to transform insulators into conductors, and has shown broad application prospects in many fields such as electronic devices, electrochemistry, catalytic technology and sensor elements. On the other hand, porous block materials have been widely used in filtration, separation technology, adsorption processes, electrochemical energy storage and optoelectronic devices due to their unique pore structure. At present, when using calcium aluminum stone to treat chloride ions in desulfurization wastewater, it still faces the disadvantages of large addition amount and low efficiency. At the same time, the effect of calcium aluminum stone in treating thallium ions in desulfurization wastewater is average. Summary of the Invention

[0005] The purpose of the present invention is to provide an iron-modified calcium aluminum compound, a preparation method and application thereof. The calcium aluminum compound is modified by iron doping. When used in desulfurization wastewater treatment, it can not only significantly improve the removal efficiency of chloride / thallium ions, but also reduce the amount of iron-modified calcium aluminum, thereby reducing costs.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A method for preparing an iron-modified calcium-aluminum compound is provided, which is obtained by mixing a calcium source, an aluminum source and an iron source and then calcining the mixture; wherein the molar ratio of Ca:Al in the calcium source and the aluminum source is (1-1.3):1, and the mass ratio of the total mass of the calcium source and the aluminum source to the mass of the iron ions in the iron source is 1:(0.01-50).

[0008] Preferably, the calcination conditions are: 800-1800° C., 1-6 h.

[0009] Preferably, the calcium source is at least one of calcium oxide, calcium hydroxide, calcium carbonate, calcium bicarbonate and calcium nitrate.

[0010] Preferably, the aluminum source is at least one of aluminum oxide, aluminum hydroxide, aluminum sulfate, aluminum carbonate, aluminum nitrate, aluminum arsenate, aluminum silicate, aluminum magnesium hydrotalcite, and aluminate.

[0011] Preferably, the iron source is at least one of ferric oxide, ferrous oxide, ferroferric oxide, ferric sulfide, ferrous nitrate, ferric nitrate, ferrous carbonate, ferric sulfate, ferrous sulfate, ferric hydroxide and ferrous hydroxide.

[0012] An iron-modified calcium-aluminum compound is prepared by any of the above methods.

[0013] The application of the iron-modified calcium-aluminum compound prepared by any of the above methods in water purification is to add the iron-modified calcium-aluminum compound to desulfurization wastewater and stir the reaction to remove chloride ions and / or thallium ions in the water. After treatment, the precipitate in the water is dried to obtain a chlorine / thallium removal product.

[0014] Preferably, the pH of the desulfurization wastewater is 5-12, the dosage of the iron-modified calcium aluminum compound is 0.1-200 g / L, and the treatment time is 1-12 h.

[0015] The application of the obtained chlorine / thallium removal product in removing toxic gases is to utilize the chlorine / thallium removal product to remove carbonyl sulfide and / or hydrogen sulfide.

[0016] Preferably, the reaction temperature is 50-200°C, and the gas flow rate is 1000-100000 mL·g -1 ·h -1 , the concentration of carbonyl sulfide or hydrogen sulfide is 50-500 mg / L.

[0017] The beneficial effects of the present invention are:

[0018] Due to the addition of iron, the surface of mayenite has more particles, which increases its surface area and contact area. This can ensure the distribution of Fe particles on the surface of mayenite to the greatest extent, improve its poor selectivity and large amount of adsorbent, and achieve stable removal of chloride ions and thallium ions. At the same time, the chlorine / thallium removal product has rich pore structure and active sites. The Fe in FeOOH in the chlorine / thallium removal product is 3+ The carbonyl sulfide and hydrogen sulfide are oxidized into elemental sulfur, so as to achieve resource utilization by treating waste with waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a SEM image of the iron-modified mayenite obtained in Example 1;

[0020] Figure 2 This is a SEM image of the chlorine / thallium removal product of the iron-modified mayenite obtained in Example 1;

[0021] Figure 3 is the XRD pattern of the chlorine / thallium removal product obtained in Example 1;

[0022] Figure 4 This is the SEM image of the calcium aluminum stone obtained in Comparative Example 1. DETAILED DESCRIPTION

[0023] Example 1

[0024] Calcium oxide and aluminum oxide with a Ca:Al molar ratio of 1:1 were mixed and stirred evenly, and then iron nitrate nonahydrate was added (the mass ratio of the total mass of calcium oxide and aluminum oxide to the mass ratio of iron ions in iron nitrate nonahydrate was 1:0.1). The mixture was placed in a muffle furnace and heated to 1200°C at a heating rate of 5°C / min. After keeping the temperature for 4 hours, the mixture was immediately taken out. The SEM image of the obtained iron-modified mayenite is shown in the figure below. Figure 1 As shown, its surface becomes rough, indicating that iron is well doped into the mayenite.

[0025] Desulfurization wastewater with a pH of 7.57, a chloride ion concentration of 4664.7 mg / L, and a thallium ion concentration of 115 μg / L was added to 100 mL of the wastewater. After stirring at 500 rpm for 4 hours at room temperature, the residual chloride ion and thallium ion contents in the wastewater were measured. The calculated chloride ion removal rates were 94.96% and 98.34% for thallium ions, respectively.

[0026] Finally, the precipitate in the wastewater was taken out and placed in an oven to dry at 80°C, and then ground to obtain the chlorine / thallium removal product, the SEM image of which is shown in the figure. Figure 2 As shown, the XRD pattern is Figure 3As shown, the main phases are Ca4Al2O6Cl2·10H2O (PDF No.:19-0202), Al(OH)3 (PDF No.:33-0018), CaCO3 (PDF No.:05-0586) and FeOOH (PDF No.:29-0713).

[0027] Comparative Example 1

[0028] Calcium oxide and aluminum oxide with a Ca:Al molar ratio of 1:1 were mixed and stirred evenly, placed in a muffle furnace and heated to 1200°C at a heating rate of 5°C / min, kept warm for 4 hours and immediately taken out. The SEM image of the obtained mayenite is shown in the figure below. Figure 4 As shown, the surface is relatively smooth.

[0029] Desulfurization wastewater (the same as in Example 1) with a pH of 7.57, a chloride ion concentration of 4664.7 mg / L, and a thallium ion concentration of 115 μg / L was prepared. 5 g of the obtained mayenite was added to 100 mL of the wastewater. After stirring at 500 rpm for 4 hours at room temperature, the residual chloride ion content and thallium ion content in the wastewater were measured. The calculated chloride ion removal rate was 41.28%, and the thallium ion removal rate was 47.63%.

[0030] Finally, the precipitated portion in the wastewater is taken out and placed in an oven to be dried at a temperature of 80° C., and then ground to obtain a chlorine / thallium removal product.

[0031] Example 2

[0032] Calcium hydroxide and aluminum hydroxide with a Ca:Al molar ratio of 1.1:1 were mixed and stirred evenly, and then ferrous oxide was added to the mixture (the mass ratio of the total mass of calcium hydroxide and aluminum hydroxide to the mass ratio of iron ions in ferrous oxide was 1:0.05). The mixture was placed in a muffle furnace and heated to 1100°C at a heating rate of 5°C / min, kept warm for 5 hours, and then taken out when the temperature was lowered to 1000°C to obtain iron-modified mayenite.

[0033] Desulfurization wastewater with a pH of 6.2, a chloride ion concentration of 3000 mg / L, and a thallium ion concentration of 50 μg / L was taken and the pH of the wastewater was adjusted to 12. Then, 8 g of the obtained iron-modified mayenite was added to 100 mL of the wastewater. After stirring at 500 rpm at room temperature for 4 hours, the residual chloride ion content and thallium ion content in the wastewater were measured, and the calculated chloride ion removal rate was 88.74%, and the thallium ion removal rate was 85.19%.

[0034] Finally, the precipitated portion in the wastewater is taken out and placed in an oven to be dried at a temperature of 80° C., and then ground to obtain a chlorine / thallium removal product.

[0035] Comparative Example 2

[0036] Calcium hydroxide and aluminum hydroxide with a Ca:Al molar ratio of 1.1:1 were mixed and stirred evenly, placed in a muffle furnace, heated to 1100°C at a heating rate of 5°C / min, kept warm for 5 hours, and then taken out when the temperature was lowered to 1000°C to obtain mayenite.

[0037] Desulfurization wastewater with a pH of 6.2, a chloride ion concentration of 3000 mg / L, and a thallium ion concentration of 50 μg / L was taken, and the pH of the wastewater was adjusted to 12 (the same as in Example 2). Then, 8 g of the obtained mayenite was added to 100 mL of wastewater. After stirring at 500 rpm at room temperature for 4 hours, the residual chloride ion content and thallium ion content in the wastewater were measured. The calculated chloride ion removal rate was 38.16%, and the thallium ion removal rate was 38.67%.

[0038] Finally, the precipitated portion in the wastewater is taken out and placed in an oven to be dried at a temperature of 80° C., and then ground to obtain a chlorine / thallium removal product.

[0039] Example 3

[0040] Calcium carbonate and aluminum arsenate with a Ca:Al molar ratio of 1.2:1 were mixed and stirred evenly, and then ferroferric oxide was added (the mass ratio of the total mass of calcium sulfate and aluminum sulfate to the iron ions in ferroferric oxide was 1:0.2). The mixture was placed in a muffle furnace and heated to 900°C at a heating rate of 5°C / min, kept warm for 6 hours, and then taken out when the temperature was lowered to 700°C to obtain iron-modified mayenite.

[0041] Desulfurization wastewater with a pH of 6.8, a chloride ion concentration of 10,000 mg / L, and a thallium ion concentration of 170 μg / L was added. 5 g of the iron-modified mayenite was added to 100 mL of the wastewater. After stirring at 500 rpm for 3 hours at room temperature, the residual chloride ion and thallium ion contents in the wastewater were measured. The calculated chloride ion removal rate was 81.22%, and the thallium ion removal rate was 76.54%.

[0042] Finally, the precipitated portion in the wastewater is taken out and placed in an oven to be dried at a temperature of 80° C., and then ground to obtain a chlorine / thallium removal product.

[0043] Comparative Example 3

[0044] Calcium carbonate and aluminum arsenate with a Ca:Al molar ratio of 1.2:1 were mixed and stirred evenly, placed in a muffle furnace, heated to 900°C at a heating rate of 5°C / min, kept warm for 6 hours, and then taken out when the temperature was lowered to 700°C to obtain mayenite.

[0045] Desulfurization wastewater with a pH of 6, a chloride ion concentration of 10,000 mg / L, and a thallium ion concentration of 170 μg / L (the same as in Example 3) was prepared. 5 g of the obtained mayenite was added to 100 mL of the wastewater. After stirring at 500 rpm for 3 hours at room temperature, the residual chloride ion content and thallium ion content in the wastewater were measured. The calculated chloride ion removal rate was 29.68%, and the thallium ion removal rate was 32.46%.

[0046] Finally, the precipitated portion in the wastewater is taken out and placed in an oven to be dried at a temperature of 80° C., and then ground to obtain a chlorine / thallium removal product.

[0047] Example 4

[0048] Calcium oxide and aluminum oxide with a Ca:Al molar ratio of 1.3:1 were mixed and stirred evenly, and then ferric nitrate nonahydrate was added and mixed (the mass ratio of the total mass of calcium oxide and aluminum oxide to the mass ratio of iron ions in ferric nitrate nonahydrate was 1:0.1). The mixture was placed in a muffle furnace and heated to 1200°C at a heating rate of 5°C / min, kept warm for 4 hours, and then taken out when the temperature was lowered to 800°C to obtain iron-modified mayenite.

[0049] Desulfurization wastewater with a pH of 7.57, a chloride ion concentration of 4664.7 mg / L, and a thallium ion concentration of 115 μg / L was added to 100 mL of the wastewater. After stirring at 500 rpm for 4 hours at room temperature, the residual chloride ion and thallium ion contents in the wastewater were measured. The calculated chloride ion removal rates were 77.30% and 99.89%, respectively.

[0050] Finally, the precipitated portion in the wastewater is taken out and placed in an oven to be dried at a temperature of 80° C., and then ground to obtain a chlorine / thallium removal product.

[0051] Comparative Example 4

[0052] Calcium carbonate and aluminum carbonate with a Ca:Al molar ratio of 1.3:1 were mixed and stirred evenly, placed in a muffle furnace, heated to 1200°C at a heating rate of 5°C / min, kept warm for 4 hours, and then taken out when the temperature was lowered to 800°C to obtain mayenite.

[0053] Desulfurization wastewater with a pH of 7.12, a chloride ion concentration of 4664.7 mg / L, and a thallium ion concentration of 115 μg / L (the same as in Example 4) was prepared. 5 g of the obtained mayenite was added to 100 mL of the wastewater. After stirring at 500 rpm for 4 hours at room temperature, the residual chloride ion content and thallium ion content in the wastewater were measured. The calculated chloride ion removal rate was 39.26%, and the thallium ion removal rate was 38.93%.

[0054] Finally, the precipitated portion in the wastewater is taken out and placed in an oven to be dried at a temperature of 80° C., and then ground to obtain a chlorine / thallium removal product.

[0055] Example 5

[0056] Calcium nitrate and aluminum nitrate with a Ca:Al molar ratio of 1.2:1 were mixed and stirred evenly, and then ferric hydroxide was added and mixed (the mass ratio of the total mass of calcium nitrate and aluminum nitrate to the mass ratio of iron ions in ferric hydroxide was 1:0.01). The mixture was placed in a muffle furnace and heated to 1500°C at a heating rate of 5°C / min, kept warm for 4 hours, and then taken out when the temperature was lowered to 1200°C to obtain iron-modified mayenite.

[0057] Desulfurization wastewater with a pH of 6.8, a chloride ion concentration of 6000 mg / L, and a thallium ion concentration of 65 μg / L was prepared. 10g of the iron-modified mayenite was added to 100mL of the wastewater. After stirring at 500 rpm for 4 hours at room temperature, the residual chloride ion and thallium ion contents in the wastewater were measured. The calculated chloride ion removal rates were 74.21% and 76.97% for thallium ions.

[0058] Finally, the precipitated portion in the wastewater is taken out and placed in an oven to be dried at a temperature of 80° C., and then ground to obtain a chlorine / thallium removal product.

[0059] Comparative Example 5

[0060] Calcium nitrate and aluminum nitrate with a Ca:Al molar ratio of 1.2:1 were mixed and stirred evenly, placed in a muffle furnace, heated to 1500°C at a heating rate of 5°C / min, kept warm for 4 hours, and then taken out when the temperature was lowered to 1200°C to obtain mayenite.

[0061] Desulfurization wastewater with a pH of 6.8, a chloride ion concentration of 6000 mg / L, and a thallium ion concentration of 65 μg / L (the same as in Example 5) was prepared. 10 g of the obtained mayenite was added to 100 mL of the wastewater. After stirring at 500 rpm for 4 hours at room temperature, the residual chloride ion content and thallium ion content in the wastewater were measured. The calculated chloride ion removal rate was 43.27%, and the thallium ion removal rate was 45.98%.

[0062] Finally, the precipitated portion in the wastewater is taken out and placed in an oven to be dried at a temperature of 80° C., and then ground to obtain a chlorine / thallium removal product.

[0063] From the removal rate data of the above examples and comparative examples, it can be seen that the iron-modified mayenite has significantly improved the removal efficiency of chloride ions and thallium ions. This shows that iron-modified mayenite can improve the removal efficiency of chloride ions and thallium ions in desulfurization wastewater. The reason is that iron-modified mayenite has a rich pore structure and active sites, which can maximize the uniform distribution of Fe particles on the mayenite surface, improve its poor selectivity, large adsorbent dosage and other problems, and achieve stable removal of chloride ions and thallium ions.

[0064] Example 6

[0065] The chlorine / thallium removal product obtained in Example 1 was heated at a space velocity of 30000 ml·g -1 ·h -1 , hydrogen sulfide and carbonyl sulfide were treated separately at a reaction temperature of 80°C. The removal rate of hydrogen sulfide was 86.6% and the removal rate of carbonyl sulfide was 85.4% within 30 minutes.

[0066] Comparative Example 6

[0067] The chlorine / thallium removal product obtained in Comparative Example 1 was heated at a space velocity of 30000 ml·g -1 ·h -1 , hydrogen sulfide and carbonyl sulfide were treated separately at a reaction temperature of 80°C. The removal rate of hydrogen sulfide was 68.9% and the removal rate of carbonyl sulfide was 68.2% within 30 minutes.

[0068] Example 7

[0069] The chlorine / thallium removal product obtained in Example 2 was heated at a space velocity of 4000 ml·g -1 ·h -1 , hydrogen sulfide and carbonyl sulfide were treated separately at a reaction temperature of 100°C. The removal rate of hydrogen sulfide was 99.9% within 30 minutes, and the removal rate of carbonyl sulfide was 96.7%.

[0070] Comparative Example 7

[0071] The chlorine / thallium removal product obtained in Comparative Example 2 was heated at a space velocity of 4000 ml·g -1 ·h -1 , hydrogen sulfide and carbonyl sulfide were treated separately at a reaction temperature of 100°C. The removal rate of hydrogen sulfide was 61.9% and the removal rate of carbonyl sulfide was 60.7% within 30 minutes.

[0072] Example 8

[0073] The chlorine / thallium removal product obtained in Example 3 was heated at a space velocity of 10000 ml·g -1 ·h -1, hydrogen sulfide and carbonyl sulfide were treated separately at a reaction temperature of 50°C. The removal rate of hydrogen sulfide was 92.2% and the removal rate of carbonyl sulfide was 94.9% within 60 minutes.

[0074] Comparative Example 8

[0075] The chlorine / thallium removal product obtained in Comparative Example 3 was heated at a space velocity of 10000 ml·g -1 ·h -1 , hydrogen sulfide and carbonyl sulfide were treated separately at a reaction temperature of 50°C. The removal rate of hydrogen sulfide was 68.7% and the removal rate of carbonyl sulfide was 69.5% within 60 minutes.

[0076] Example 9

[0077] The chlorine / thallium removal product obtained in Example 4 was heated at a space velocity of 3500 ml·g -1 ·h -1 , hydrogen sulfide and carbonyl sulfide were treated separately at a reaction temperature of 110°C, and the removal rate of hydrogen sulfide and carbonyl sulfide was 99.9% and 99.9% within 10 minutes.

[0078] Comparative Example 9

[0079] The chlorine / thallium removal product obtained in Comparative Example 4 was heated at a space velocity of 3500 ml·g -1 ·h -1 , hydrogen sulfide and carbonyl sulfide were treated separately at a reaction temperature of 110°C. The removal rate of hydrogen sulfide was 66.4% and the removal rate of carbonyl sulfide was 67.5% within 10 minutes.

[0080] Example 10

[0081] The chlorine / thallium removal product obtained in Example 5 was heated at a space velocity of 20000 ml·g -1 ·h -1 , the reaction temperature was 90℃, and hydrogen sulfide and carbonyl sulfide were treated separately. The removal rate of hydrogen sulfide was 93.6% within 20 minutes, and the removal rate of carbonyl sulfide was 95.3%.

[0082] Comparative Example 10

[0083] The chlorine / thallium removal product obtained in Comparative Example 5 was heated at a space velocity of 20000 ml·g -1 ·h -1 , the reaction temperature was 90℃, and hydrogen sulfide and carbonyl sulfide were treated separately. The removal rate of hydrogen sulfide was 61.1% and the removal rate of carbonyl sulfide was 62.7% within 20 minutes.

[0084] It can be seen from the removal rate data of Examples 6-10 and Comparative Examples 6-10 that the chlorine removal / thallium products in Examples 1-5 have a stable removal effect on carbonyl sulfide and hydrogen sulfide, while the chlorine removal / thallium products in Comparative Examples 1-5 have poor removal effects on carbonyl sulfide and hydrogen sulfide. The reason is that the chlorine removal / thallium products obtained in Examples 1-5 have rich pore structures and active sites, and the Fe in FeOOH in the chlorine removal / thallium products is not as good as the Fe in FeOOH. 3+ S -2 Oxidized into elemental sulfur, it achieves cross-media pollution control and waste resource utilization by treating waste with waste.

[0085] The above is only a preferred embodiment of the patent of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the patent of the present invention. These improvements and modifications should also be regarded as the scope of protection of the patent of the present invention.

Claims

1. A method for preparing an iron-modified calcium aluminum compound, characterized in that: The method is obtained by mixing a calcium source, an aluminum source and an iron source and then calcining the mixture; wherein the molar ratio of Ca:Al in the calcium source and the aluminum source is (1-1.3):1, and the mass ratio of the total mass of the calcium source and the aluminum source to the mass ratio of the iron ions in the iron source is 1:(0.01-50).

2. The method for preparing the iron-modified calcium aluminum compound according to claim 1, wherein The calcination conditions are: 800-1800℃，1-6h。 3. The method for preparing the iron-modified calcium aluminum compound according to claim 1, wherein: The calcium source is at least one of calcium oxide, calcium hydroxide, calcium carbonate, calcium bicarbonate and calcium nitrate.

4. The method for preparing the iron-modified calcium aluminum compound according to claim 1, wherein: The aluminum source is at least one of aluminum oxide, aluminum hydroxide, aluminum sulfate, aluminum carbonate, aluminum nitrate, aluminum arsenate, aluminum silicate, aluminum magnesium hydrotalcite and aluminate.

5. The method for preparing the iron-modified calcium aluminum compound according to claim 1, wherein: The iron source is at least one of ferric oxide, ferrous oxide, ferroferric oxide, ferric sulfide, ferrous nitrate, ferric nitrate, ferrous carbonate, ferric sulfate, ferrous sulfate, ferric hydroxide and ferrous hydroxide.

6. An iron-modified calcium aluminum compound, characterized in that The method is prepared by any one of claims 1 to 5.

7. Use of the iron-modified calcium aluminum compound prepared by the method according to any one of claims 1 to 5 in water purification, characterized in that: The method comprises adding an iron-modified calcium aluminum compound into desulfurization wastewater and stirring the mixture to remove chloride ions and / or thallium ions in the water body. After the treatment, the precipitate in the water body is dried to obtain a chloride / thallium removal product.

8. The use according to claim 7, characterized in that The pH of desulfurization wastewater is 5-12, the dosage of iron-modified calcium aluminum compound is 0.1-200 g / L, and the treatment time is 1-12 hours.

9. Use of the chlorine / thallium removal product obtained in claim 7 in removing toxic gases, characterized in that: The method utilizes the chlorine / thallium removal product to remove carbonyl sulfide and / or hydrogen sulfide.

10. The use according to claim 9, characterized in that The reaction temperature is 50-200℃ and the gas flow rate is 1000-100000mL·g -1 ·h -1 , the concentration of carbonyl sulfide or hydrogen sulfide is 50-500 mg / L.

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