Fe2O3 and ZnO loaded sepiolite-based gaseous arsenic adsorption material as well as preparation method and application thereof

Abstract

The invention relates to a sepiolite-based gaseous arsenic adsorption material loaded with Fe2O3 and ZnO and a preparation method and application thereof, and belongs to the technical field of composite adsorption materials.The preparation method comprises the following steps that sepiolite is taken and purified; and adding Fe2O3, ZnO and the purified sepiolite into a ball milling instrument, carrying out ball milling treatment, and drying to obtain the sepiolite-based gaseous arsenic adsorption material. The invention solves the problems of limited application scene, complex preparation process, poor loading effect and low adsorption efficiency in high-temperature and complex flue gas environments of the existing adsorption material carrier by taking sepiolite as a carrier and loading the Fe2O3 and ZnO bimetallic oxide gaseous arsenic adsorption material through a mechanical ball milling method and the preparation and application methods thereof.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of composite adsorption materials, and particularly relates to a sepiolite-based gaseous arsenic adsorption material loaded with Fe2O3 and ZnO, a preparation method thereof and application thereof. BACKGROUND

[0002] In the field of industrial flue gas purification, the removal of gaseous arsenic pollutants is an important challenge. Arsenic compounds are usually derived from industrial processes such as coal combustion and metallurgy, which have serious harm to the environment and human health, so it is crucial to develop efficient and stable adsorption materials.

[0003] Currently, the purification technology of gaseous arsenic mainly relies on adsorption method, and the core is to develop high-performance adsorption materials. Existing adsorption materials mainly include single metal oxide, activated carbon, natural mineral and supported composite material, etc. Among them, although single metal oxide has certain adsorption activity for gaseous arsenic, it has problems such as small specific surface area, easy agglomeration and difficult recovery, which limits its practical application; the adsorption capacity of activated carbon material is limited, and its stability is poor in high-temperature flue gas environment; natural minerals (such as sepiolite) are often used as adsorption carriers due to their unique layered porous structure, large specific surface area and low cost, but they are usually used in low-temperature or room-temperature environment, which is essentially different from the application scene of high-temperature flue gas gaseous arsenic adsorption, and cannot meet the complex working conditions of high-temperature, high-flow and multi-component interference of industrial flue gas.

[0004] At the same time, the performance of supported composite material depends on the loading process and component matching. Existing loading methods include impregnation method, sol-gel method, mechanical grinding method, etc. The impregnation method and sol-gel method have complex process and high cost, and are easy to cause uneven distribution of active components; traditional mechanical grinding method usually uses manual grinding or simple wet grinding process, which has problems of unstable loading of active components and poor dispersibility, and cannot fully play the synergistic adsorption effect of carrier and active components.

[0005] In summary, the existing gaseous arsenic adsorption materials have problems such as limited application scene of carrier, complex preparation process, and large influence of adsorption performance by temperature and flue gas components, and sepiolite as a natural mineral carrier with excellent performance has not been developed for application in high-temperature flue gas gaseous arsenic adsorption. Therefore, it is a technical problem to be solved to develop a gaseous arsenic adsorption material with sepiolite as carrier, simple and controllable process, good loading effect, high adsorption efficiency and adaptability to complex high-temperature flue gas environment. SUMMARY

[0006] This invention aims to provide a gaseous arsenic adsorbent material using sepiolite as a carrier and loaded with Fe2O3 and ZnO bimetallic oxides via mechanical ball milling, along with its preparation and application methods. This invention solves the problems of limited application scenarios, complex preparation processes, poor loading effects, and low adsorption efficiency in high-temperature and complex flue gas environments associated with existing adsorbent carriers.

[0007] On the one hand, the present invention provides a method for preparing sepiolite-based gaseous arsenic adsorbent material loaded with Fe2O3 and ZnO, using the following technical solution: A method for preparing sepiolite-based gaseous arsenic adsorbent loaded with Fe2O3 and ZnO includes the following steps: S1. Take sepiolite and purify it. S2. Take Fe2O3, ZnO and sepiolite purified in step S1 and add them to a ball mill for ball milling and drying to obtain sepiolite-based gaseous arsenic adsorbent material.

[0008] Preferably, the purification process of sepiolite in step S1 is as follows: the sepiolite is passed through a 100-mesh sieve, 10% HCl is added to a container at a solid-liquid ratio of 1:20, stirred thoroughly for 3 hours, allowed to stand for 12 hours, washed until neutral, dried at 110°C for 12 hours, and then ground with an agate mortar for later use.

[0009] Preferably, in step S2, the elemental mass ratio of Fe, Zn and sepiolite in Fe2O3, ZnO and sepiolite is (1-10):(1-10):100.

[0010] Preferably, in step S2, the elemental mass ratio of Fe, Zn and sepiolite in Fe2O3, ZnO and sepiolite is 5:5:10.

[0011] Preferably, the ball milling process in step S2 is as follows: the ball mill speed is set to 200-600 r / min; the ball milling time is 1-7 h.

[0012] Preferably, the ball milling process in step S2 is as follows: the ball mill speed is set to 600 r / min; the ball milling time is 4 h.

[0013] On the one hand, the present invention also provides a sepiolite-based gaseous arsenic adsorbent material loaded with Fe2O3 and ZnO prepared by the above preparation method.

[0014] Furthermore, this invention also provides the application of the sepiolite-based gaseous arsenic adsorbent material loaded with Fe2O3 and ZnO prepared by the above preparation method in the removal of gaseous arsenic from high-temperature flue gas, using the following technical solution: Application of sepiolite-based gaseous arsenic adsorbent loaded with Fe2O3 and ZnO in the removal of gaseous arsenic from high-temperature flue gas, with an adsorption temperature of 80-900℃ and an adsorption time of 5-90min. The nitrogen atmosphere gas composition includes: nitrogen 70-75%, argon 20%, and oxygen 5-10%; The flue gas atmosphere composition includes: nitrogen 37.5%-75%, argon 20%, oxygen 5%-20%, carbon dioxide 0-20%, nitric oxide 0-1%, and sulfur dioxide 0-1.5%.

[0015] In summary, the present invention has the following beneficial technical effects: 1. This invention applies purified sepiolite to the adsorption of gaseous arsenic in high-temperature flue gas. It fully utilizes the advantages of sepiolite's porous structure, high specific surface area, and good high-temperature resistance, and combines it with Fe2O3 and ZnO bimetallic oxides for synergistic loading, which significantly improves the adsorption activity for gaseous arsenic. This solves the problem of low adsorption efficiency of single carriers or single metal oxides, and realizes the synergistic adsorption effect of carriers and active components. The composite material is prepared by mechanical dry grinding, which does not require complex equipment or expensive reagents. Compared with traditional impregnation and sol-gel methods, the process steps are simplified, the operation is convenient, and the cost is lower.

[0016] 2. This invention utilizes an optimized mechanical ball milling process to uniformly and firmly load Fe2O3 and ZnO onto the surface and pores of sepiolite, avoiding the problem of active component agglomeration or detachment. Experimental verification shows that the material prepared under the optimal process conditions has a significantly higher arsenic adsorption capacity than pure sepiolite, single metal oxides, and hand-ground composite materials, and its adsorption efficiency far exceeds that of existing similar materials.

[0017] 3. The sepiolite-based gaseous arsenic adsorbent obtained by this invention has good adsorption performance in the high temperature range of 300-900℃, especially at 600℃, which solves the problem of insufficient adsorption stability of existing materials at high temperatures; at the same time, it can still maintain high adsorption capacity in simulated flue gas atmosphere containing complex components such as CO2, NO, SO2, etc., and is suitable for actual industrial flue gas conditions such as coal combustion and non-ferrous smelting. Attached Figure Description

[0018] Figure 1 The graphs show the arsenic adsorption performance of the adsorbent materials prepared in Examples 1-3. Figure 2 The graphs show the arsenic adsorption performance of the adsorbent materials prepared in Examples 1 and 4-7. Figure 3 The graphs show the arsenic adsorption performance of the adsorbent materials prepared in Examples 1 and 8-13. Figure 4 The FTIR characterization diagrams of the adsorbent materials prepared in Comparative Examples 1, 2 and 4 are shown. Figure 5 The following are FTIR characterization images of the adsorbent materials prepared in Example 1, Comparative Example 1, and Comparative Example 2; Figure 6 The following are FTIR characterization diagrams of the adsorbent materials prepared in Example 1, Comparative Example 3, and Comparative Example 4; Figure 7 The graphs show the arsenic adsorption performance of the adsorbent materials prepared in Example 1, Comparative Examples 1-4 and Comparative Example 7. Figure 8 The graphs show the arsenic adsorption performance of the adsorbent materials prepared in Example 1 and Comparative Examples 4-6. Figure 9 This is a graph showing the change in arsenic adsorption capacity of the adsorbent material prepared in Example 1 over adsorption time. Figure 10 This is a graph showing the change in arsenic adsorption capacity of the adsorbent material prepared in Example 1 as a function of adsorption temperature. Figure 11 The graph shows the arsenic adsorption capacity of the adsorbent material prepared in Example 1 under different atmospheric compositions. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to embodiments and test examples.

[0020] Example

[0021] Example 1 A method for preparing sepiolite-based gaseous arsenic adsorbent loaded with Fe2O3 and ZnO includes the following steps: 1) Take sepiolite and pass it through a 100-mesh sieve. Add 10% HCl to the container at a solid-liquid ratio of 1:20. Stir thoroughly with a magnetic stirrer for 3 hours, let stand for 12 hours, wash until neutral, dry in a vacuum drying oven at 110℃ for 12 hours, and then grind with an agate mortar to obtain purified sepiolite. 2) Weigh out Fe2O3, ZnO, and the purified sepiolite from step 1) according to an elemental mass ratio of 5:5:100, i.e., 5g sepiolite, 0.311g ZnO, and 0.357g Fe2O3. Add them to a ball mill for ball milling. The ball mill contains 15 steel balls, each weighing about 4g. Set the ball mill speed to 600r / min and the ball milling time to 4h, with the ball mill running for 1h and then intermittently for 0.5h. After ball milling, remove and dry the material to obtain sepiolite-based gaseous arsenic adsorbent.

[0022] Example 2 The preparation method of sepiolite-based gaseous arsenic adsorbent loaded with Fe2O3 and ZnO differs from that in Example 1 in that, in step 2), the mass ratio of Fe, Zn and sepiolite is 1:1:100, i.e., 5g sepiolite, 0.062g ZnO, and 0.071g Fe2O3. The remaining steps are the same as in Example 1.

[0023] Example 3 The preparation method of sepiolite-based gaseous arsenic adsorbent loaded with Fe2O3 and ZnO differs from that in Example 1 in that, in step 2), the mass ratio of Fe, Zn and sepiolite is 10:10:100, i.e., 5g sepiolite, 0.622g ZnO, and 0.715g Fe2O3. The remaining steps are the same as in Example 1.

[0024] Example 4 The preparation method of sepiolite-based gaseous arsenic adsorbent loaded with Fe2O3 and ZnO differs from that in Example 1 in that, in step 2), the ball mill speed is 200 r / min, while the remaining steps are the same as in Example 1.

[0025] Example 5 The preparation method of sepiolite-based gaseous arsenic adsorbent loaded with Fe2O3 and ZnO differs from that in Example 1 in that, in step 2), the ball mill speed is 300 r / min, while the other steps are the same as in Example 1.

[0026] Example 6 The preparation method of sepiolite-based gaseous arsenic adsorbent loaded with Fe2O3 and ZnO differs from that in Example 1 in that, in step 2), the ball mill speed is 400 r / min, while the other steps are the same as in Example 1.

[0027] Example 7 The preparation method of sepiolite-based gaseous arsenic adsorbent loaded with Fe2O3 and ZnO differs from that in Example 1 in that, in step 2), the ball mill speed is 500 r / min, while the other steps are the same as in Example 1.

[0028] Example 8 The preparation method of sepiolite-based gaseous arsenic adsorbent loaded with Fe2O3 and ZnO differs from that in Example 1 in that the ball milling time in step 2) is 1 hour, while the other steps are the same as in Example 1.

[0029] Example 9 The preparation method of sepiolite-based gaseous arsenic adsorbent loaded with Fe2O3 and ZnO differs from that in Example 1 in that the ball milling time in step 2) is 2 hours, while the remaining steps are the same as in Example 1.

[0030] Example 10 The preparation method of sepiolite-based gaseous arsenic adsorbent loaded with Fe2O3 and ZnO differs from that in Example 1 in that the ball milling time in step 2) is 3 hours, while the other steps are the same as in Example 1.

[0031] Example 11 The preparation method of sepiolite-based gaseous arsenic adsorbent loaded with Fe2O3 and ZnO differs from that in Example 1 in that the ball milling time in step 2) is 5 hours, while the other steps are the same as in Example 1.

[0032] Example 12 The preparation method of sepiolite-based gaseous arsenic adsorbent loaded with Fe2O3 and ZnO differs from that in Example 1 in that the ball milling time in step 2) is 6 hours, while the other steps are the same as in Example 1.

[0033] Example 13 The preparation method of sepiolite-based gaseous arsenic adsorbent loaded with Fe2O3 and ZnO differs from that in Example 1 in that the ball milling time in step 2) is 7 hours, while the other steps are the same as in Example 1.

[0034] Comparative Example Comparative Example 1 The preparation method of the adsorbent material differs from that of Example 1 in that Fe2O3 and ZnO were not added in step 2), and anhydrous ethanol was added to the sepiolite, with a solid-liquid ratio of 1:1. The remaining steps are the same as those in Example 1.

[0035] Comparative Example 2 The preparation method of the adsorbent material differs from that of Example 1 in that Fe2O3 and ZnO were not added in step 2), while the remaining steps are the same as those in Example 1.

[0036] Comparative Example 3 The method for preparing the adsorbent material involves mixing 0.124 mg ZnO, 0.143 mg Fe2O3 and 2 g purified sepiolite in a mortar, grinding the material evenly by hand, scraping the material into a petri dish lined with tin foil, drying it in an oven, and then storing it in a sealed bag for later use.

[0037] Comparative Example 4 The preparation method of sepiolite-based gaseous arsenic adsorbent loaded with Fe2O3 and ZnO differs from that in Example 1 in that, in step 2), anhydrous ethanol is added to Fe2O3, ZnO and sepiolite purified in step 1) as a grinding medium, with a solid-liquid ratio of 1:1. The remaining steps are the same as in Example 1.

[0038] Comparative Example 5 The preparation method of sepiolite-based gaseous arsenic adsorbent loaded with Fe2O3 and ZnO differs from that in Example 1 in that, in step 2), anhydrous ethanol is added to Fe2O3, ZnO and sepiolite purified in step 1) as a grinding medium, with a solid-liquid ratio of 1:5. The remaining steps are the same as in Example 1.

[0039] Comparative Example 6 The preparation method of sepiolite-based gaseous arsenic adsorbent loaded with Fe2O3 and ZnO differs from that in Example 1 in that, in step 2), anhydrous ethanol is added to Fe2O3, ZnO and sepiolite purified in step 1) as a grinding medium, with a solid-liquid ratio of 1:10. The remaining steps are the same as in Example 1.

[0040] Comparative Example 7 The adsorbent material was directly sepiolite purified in Example 1.

[0041] Test case Test Example 1 110 mg of the sepiolite-based gaseous arsenic adsorbent material loaded with Fe₂O₃ and ZnO prepared in Examples 1-3 were taken separately and placed in quartz adsorption tubes. Quartz adsorption tubes are a common experimental apparatus, consisting of a lid and a cylindrical container. The lid and bottom are composed of a nickel alloy mesh and a thin layer of quartz wool. During the experiment, the lid was moved, and then the adsorbent material was placed into the container. After the experiment, it was removed from the container.

[0042] Before the adsorption experiment begins, the temperature of the fixed bed must be raised to the working temperature of 600 ℃. The high-temperature flue gas is set in two cases: (1) Nitrogen atmosphere gas composition: nitrogen 70-75%, argon 20%, oxygen 5-10%; (2) Flue gas atmosphere gas composition: nitrogen 37.5%-75%, argon 20%, oxygen 5%-20%, carbon dioxide 0-20%, nitric oxide 0-1%, sulfur dioxide 0-1.5%. The nitrogen atmosphere gas composition in this test example is: nitrogen 350mL / min, argon 100mL / min, oxygen 50mL / min; the flue gas atmosphere gas composition is: nitrogen 293.5mL / min, argon 100mL / min, oxygen 50mL / min, carbon dioxide 50mL / min, nitric oxide 2.5mL / min, sulfur dioxide 4mL / min. The first case, i.e., nitrogen atmosphere gas composition, is selected in this test example. At the beginning of the experiment, the quartz adsorption tube is placed in the electric heating furnace for preheating for 1 min. After preheating, a simulated gas containing gaseous arsenic (As₂O₃) was passed through a fixed bed, and the adsorbent material adsorbed the gaseous arsenic for 30 minutes. After adsorption, the quartz adsorption tube containing the material was removed, and the arsenic adsorbent material was then subjected to total digestion, followed by volume dilution of the digested solution. The arsenic content in the adsorbent material was determined using atomic fluorescence spectrometry (AFS).

[0043] The digestion process is an existing technique. During digestion, the solid-to-liquid mass ratio is 1:60 (g / mL). The sample (0.1 g) obtained from the arsenic adsorption experiment was placed in a polytetrafluoroethylene digestion vessel, 1 mL of HF was added, and the mixture was shaken to allow it to react fully with the sample for 20 min. Then, 4 mL of HNO3 was added, shaken, and reacted for 10 min. Finally, 1.0 mL of H2O2 was added, and the mixture was reacted for 20 min to complete the pre-digestion. Afterward, the sample was placed in a microwave digester and underwent four digestion steps for a total of 46 min to complete the digestion. Specific digestion parameters are shown in Table 1.

[0044] Table 1 Digestion Parameter Table Step 1 2 3 4 Pressure (MPA) 1.0 1.5 2.0 2.5 Temperature (°C) 100 130 160 180 Power (W) 3000 3000 3000 3000 Ramp time (s) 500 200 200 500 Soak time (s) 60 60 60 1200 Reference Figure 1 The adsorbent material prepared in Example 1 showed the best adsorption effect on arsenic.

[0045] Test Example 2 The adsorption effect of the adsorbent materials prepared in Example 1 and Examples 4-7 on gaseous arsenic was tested under different ball milling speeds in a nitrogen atmosphere using the test method in Test Example 1, so as to carry out digestion and atomic fluorescence tests.

[0046] Reference Figure 2The arsenic capture rate generally increased with increasing ball milling speed. At ball milling speeds of 200 r / min to 400 r / min, the arsenic capture rate was relatively small and showed little change; at a ball milling speed of 500 r / min, the arsenic capture rate changed significantly. Overall, the arsenic capture rate of the adsorbent material increased with increasing ball milling speed. The arsenic adsorption effect was best at a ball milling speed of 600 r / min.

[0047] Test Example 3 The adsorbent materials prepared in Example 1 and Examples 8-13 were subjected to digestion and atomic fluorescence tests using the test method in Test Example 1.

[0048] Reference Figure 3 The arsenic adsorption capacity generally exhibits a downward-opening parabolic shape as the ball milling time increases, reaching a peak at 4 hours and then showing a downward trend, indicating that the adsorbent material prepared with a ball milling time of 4 hours has the best arsenic adsorption effect.

[0049] Therefore, this indicates that if the grinding time is too short, the grinding is insufficient, resulting in a short contact time between sepiolite and Zn and Fe elements, and a lower loading of Zn and Fe elements, leading to unsatisfactory adsorption effects. However, if the ball milling time is too long, when the sample particle size is reduced to a certain extent, the pore structure will be destroyed and fine particles will agglomerate, reducing the arsenic capture capacity of the experimental material. The experimental results show that the adsorption effect of the experimental material is best when ball-milled for 4 hours; therefore, 4 hours of ball milling is the optimal ball milling time.

[0050] Test Example 4 The adsorbent materials prepared in Example 1 and Comparative Examples 1-4 were characterized by FTIR.

[0051] Reference Figure 4 The adsorbent material prepared in Comparative Example 4 was at 3673.48 cm⁻¹. -1 2923.39cm -1 and 2853.15cm -1 The peak decreased at 2516.96 cm⁻¹. -1 1430.322cm -1 and 1798.24cm -1 A peak appeared at [location], indicating that the material synthesized by mechanical ball milling successfully loaded metal oxides onto sepiolite. (Reference) Figure 5 The adsorbent material prepared in Example 1 was at 3673.48 cm⁻¹. -1 The peak decreased at 1629.966 cm⁻¹. -1 The peak disappeared at 1413.209 cm. -1 A peak appeared at [location], indicating that the material produced by mechanical ball milling successfully loaded metal oxides onto sepiolite. (Reference)Figure 6 The adsorbent material prepared in Comparative Example 3 failed to load the metal oxide onto sepiolite.

[0052] Test Example 5 The adsorbent materials prepared in Example 1, Comparative Examples 1-4 and Comparative Example 7 were subjected to digestion and atomic fluorescence tests using the test method in Test Example 1.

[0053] Reference Figure 7 The dry-milled synthetic material showed better arsenic adsorption than the wet-milled synthetic material, indicating that the dry-milling method is superior to the wet-milling method. Compared with dry-milled sepiolite and hand-milled materials, the dry-milled synthetic material exhibited better arsenic adsorption, indicating that the sepiolite loaded with metal oxide had a higher arsenic adsorption capacity and better adsorption effect. Furthermore, the dry-milled synthetic material had a higher arsenic adsorption capacity than calcium oxide. The experimentally prepared material showed good adsorption effect on arsenic and has practical application value.

[0054] Test Example 6 The adsorbent materials prepared in Example 1 and Comparative Examples 4-6 were subjected to digestion and atomic fluorescence tests using the test method described in Test Example 1.

[0055] Reference Figure 8 As the proportion of anhydrous ethanol in the grinding medium increased, the arsenic capture amount of the adsorbent material generally showed a decreasing trend. The highest arsenic capture amount was observed when the solid-liquid ratio was 1:0, i.e., in Example 1. This indicates that the higher the proportion of ethanol added to the grinding medium, the more liquid the medium, and the more the grinding environment becomes slurry-like, which weakens the mechanical impact strength on the particles, thus resulting in a poorer arsenic adsorption effect of the prepared adsorbent material.

[0056] Test Example 7 Under conditions where the adsorbent material is not saturated, the adsorption capacity for arsenic generally increases linearly with adsorption time. Furthermore, the change in adsorption capacity over time is an important indicator for evaluating the performance of the adsorbent material. In this experiment, under a nitrogen atmosphere (nitrogen 350 mL / min, argon 100 mL / min, oxygen 50 mL / min), the changes in arsenic adsorption capacity of the adsorbent material prepared in Example 1 were investigated at adsorption times of 5 min, 15 min, 30 min, 60 min, 90 min, and 180 min.

[0057] Reference Figure 9 Within 5 to 90 minutes, the adsorption capacity of the adsorbent material for arsenic increased linearly with increasing adsorption time. However, when the adsorption time increased from 90 minutes to 180 minutes, the adsorption capacity of the adsorbent material did not change significantly, indicating that the adsorbent material had reached saturation. The adsorbent material prepared in this experiment exhibited good adsorption performance for arsenic, demonstrating its practical application value.

[0058] Test Example 8 The adsorption effect of the adsorbent material prepared in Example 1 on arsenic was tested at different adsorption temperatures. The adsorption temperatures were set to 80℃, 150℃, 300℃, 600℃, and 900℃, and the amount of arsenic adsorbed was obtained by atomic fluorescence detection.

[0059] Reference Figure 10 The amount of arsenic adsorbed generally exhibits a downward-opening parabolic shape as the adsorption temperature increases. It first increases, reaches a peak at 600℃, and then shows a downward trend. The arsenic adsorption effect is best at an adsorption temperature of 600℃.

[0060] Test Example 9 The effect of gas components on arsenic adsorption was investigated under the above experimental conditions, with an adsorption reaction time of 30 min. Nitrogen atmosphere gas components: nitrogen 350 mL / min, argon 100 mL / min, oxygen 50 mL / min; flue gas atmosphere gas components: nitrogen 293.5 mL / min, argon 100 mL / min, oxygen 50 mL / min, carbon dioxide 50 mL / min, nitric oxide 2.5 mL / min, sulfur dioxide 4 mL / min.

[0061] Reference Figure 11 After conducting adsorption experiments using the adsorbent material prepared in Example 1, the samples were digested and subjected to atomic fluorescence testing. The results showed that the adsorbent material prepared in the experiment had a better adsorption effect on arsenic under simulated flue gas atmosphere, which indicates that the adsorbent material has practical application value.

[0062] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the present invention.

Claims

1. A process for the preparation of a sepiolite-based gaseous arsenic adsorbent material loaded with Fe2O3 and ZnO, characterized in that, The method comprises the following steps: S1, taking sepiolite, and purifying the sepiolite; S2, taking Fe2O3, ZnO and the sepiolite purified in step S1, and adding them into a ball mill for ball milling, and drying to obtain a sepiolite-based gaseous arsenic adsorption material.

2. The method of claim 1, wherein the Fe2O3 and ZnO loaded sepiolite-based gaseous arsenic adsorbent material is prepared by the steps of: The purification process of the sepiolite in step S1 is as follows: sieving the sepiolite through a 100-mesh sieve, adding 10% HCl into a container at a solid-liquid ratio of 1:20, fully stirring for 3 h, standing for 12 h, washing to neutral, drying at 110°C for 12 h, and grinding with a jade mortar.

3. The method for preparing sepiolite-based gaseous arsenic adsorbent material supported on Fe2O3 and ZnO according to claim 1, characterized in that, In the Fe2O3, ZnO and sepiolite in step S2, the element mass ratio of Fe, Zn and sepiolite is (1-10):(1-10):

100.

4. The method of claim 1, wherein the Fe2O3 and ZnO loaded sepiolite-based gaseous arsenic adsorbent material is prepared by the steps of: In the Fe2O3, ZnO and sepiolite in step S2, the element mass ratio of Fe, Zn and sepiolite is 5:5:

10.

5. The method for preparing sepiolite-based gaseous arsenic adsorbent material supported on Fe2O3 and ZnO according to claim 1, characterized in that, The ball milling process in step S2 is as follows: setting the rotation speed of the ball mill at 200-600 r / min, and ball milling for 1-7 h.

6. The method of claim 1, wherein the Fe2O3 and ZnO loaded sepiolite-based gaseous arsenic adsorbent material is prepared by the steps of: The ball milling process in step S2 is as follows: setting the rotation speed of the ball mill at 600 r / min, and ball milling for 4 h.

7. A sepiolite-based gaseous arsenic adsorbent material loaded with Fe203 and ZnO, characterized in that, The method is prepared by any one of claims 1-6.

8. Use of the Fe203 and ZnO loaded sepiolite-based gaseous arsenic adsorbent material according to claim 7 for the removal of gaseous arsenic from high temperature flue gases, characterized in that, The adsorption temperature is 80-900°C, and the adsorption time is 5-90 min; the high-temperature flue gas comprises any one of a nitrogen atmosphere component or a flue gas atmosphere component; The nitrogen atmosphere component comprises: 70-75% nitrogen, 20% argon and 5-10% oxygen; The flue gas atmosphere component comprises: 37.5-75% nitrogen, 20% argon, 5-20% oxygen, 0-20% carbon dioxide, 0-1% nitric oxide and 0-1.5% sulfur dioxide.

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