Method for removing arsenic element in flat plate type catalyst

Abstract

The invention provides a method for removing an arsenic element in a flat plate type catalyst, and relates to the technical field of denitration catalyst resource utilization, and the method comprises the following steps: screening and dedusting an arsenic-containing flat plate type catalyst, and grinding to form a waste catalyst material; then the waste catalyst material and sodium carbonate are mixed and roasted, then the roasted mixed material is flushed, flushing comprises the steps that the mixed material is washed firstly, then the washed mixed material is dried and then subjected to acid pickling, washing is conducted again after acid pickling is completed, and a mixed solution is formed; carrying out solid-liquid separation on the mixed solution to obtain filtrate and filter residues; filtering the filter residue to obtain powder, drying the powder, and grinding to obtain a denitration catalyst raw material; and evaporating and crystallizing the filtrate, filtering, and drying the finished product to obtain tungsten trioxide. According to the method, the waste catalyst material and the sodium carbonate are mixed and roasted, so that arsenic-containing oxides in the waste catalyst material can generate arsenic-containing salt substances, and the arsenic-containing salt substances are removed after being flushed and are prevented from being mixed into a denitration catalyst raw material.

Description

Technical Field

[0001] The invention relates to the technical field of resource utilization of denitration catalysts, and in particular to a method for removing arsenic from a flat plate catalyst. Background Art

[0002] SCR denitration catalyst is mainly used to remove nitrogen oxides from flue gas of coal-fired boilers. Nitrogen oxides react with ammonia to generate nitrogen and water under the catalyst and certain temperature conditions. Denitration catalyst will gradually deactivate during use, resulting in a decrease in denitration efficiency. Waste denitration catalyst has certain resource value. Through resource utilization, it can be converted into valuable resources to reduce resource waste.

[0003] The Chinese patent with the authorization announcement number CN116139851B discloses a method for resource utilization of waste denitration catalysts, which comprises: (1) crushing the pretreated waste SCR denitration catalyst, mixing and roasting with a sodium source, crushing the roasted material and then soaking it in water according to a liquid-solid ratio of 5-8mL:1g; (2) separating the slurry solid-liquid to obtain a filtrate and a filter residue, washing the filter residue, and combining the washing liquid and the filtrate; (3) adding monoethanolamine and an active component source and a co-catalyst component source to the combined liquid, so that the active component metal element in the solution is 3-5% by weight, and the co-catalyst component metal element is 1-8% by weight, and stirring; (4) mixing the raw material solution with a titanium source, pre-extruding the mixed mud, extrusion molding, drying and roasting, and obtaining a new denitration catalyst. The method of the present invention has a high leaching rate of vanadium and tungsten, and the leached vanadium and tungsten can be 100% used to prepare a new denitration catalyst.

[0004] However, when high-arsenic coal is burned, the flue gas will contain a large amount of arsenic oxides. As the denitrification system runs for a long time, the SCR denitrification catalyst will be partially blocked by dust in the flue gas and poisoned by arsenic. The catalyst deactivated due to arsenic poisoning contains a large amount of arsenic oxides, which are hazardous wastes. The above-mentioned resource utilization method does not completely remove the arsenic oxides in the denitrification catalyst. Arsenic oxides mixed in the new denitrification catalyst are likely to affect the denitrification effect of the new denitrification catalyst. Summary of the invention

[0005] The present invention provides a method for removing arsenic from a flat plate catalyst, so as to solve the technical problem that the current resource utilization method fails to completely remove arsenic oxides from the denitration catalyst, and arsenic oxides are mixed in the new denitration catalyst, which easily affects the denitration effect of the new denitration catalyst.

[0006] In order to solve the above technical problems, the present invention discloses a method for removing arsenic in a flat plate catalyst, comprising the following steps: screening and removing ash from the arsenic-containing flat plate catalyst and then grinding it to form a waste catalyst material; then mixing the waste catalyst material with sodium carbonate and roasting it, and then washing the roasted mixture, the washing comprising first washing the mixture with water, then drying the washed mixture and then acid washing it, and then washing it with water again after the acid washing is completed to form a mixed liquid; performing solid-liquid separation on the mixed liquid to obtain a filtrate and a filter residue; filtering the filter residue to obtain a powder, drying the powder and then grinding it to obtain a denitration catalyst raw material; evaporating and crystallizing the filtrate, and then filtering and drying the finished product to obtain tungsten trioxide.

[0007] Preferably, the particle size of the spent catalyst material is 30-60 mesh.

[0008] Preferably, the spent catalyst material and sodium carbonate are mixed in a mass ratio of 1:0.1.

[0009] Preferably, the spent catalyst material is mixed with sodium carbonate and calcined at a temperature of 750-850°C.

[0010] Preferably, the mixed material is pickled with a 5% dilute sulfuric acid solution.

[0011] Preferably, the finished product is calcined after drying, and the calcination temperature is 400-500°C.

[0012] Preferably, a flushing device is used to flush the mixed material, the flushing device comprises a flushing box, discharge ports are arranged on the left and right sides of the flushing box, a box door is arranged at the discharge port, a placement box is arranged in the flushing box, a filter is arranged at the bottom of the placement box, discharge ports are arranged on the left and right sides of the placement box, a material door is arranged at the discharge port, a flushing port is arranged at the upper end of the placement box, two liquid storage tanks are arranged on the flushing box, a pump body is arranged between the two liquid storage tanks, the liquid storage tank is connected with the input end of the pump body through a connecting pipe, a first valve is arranged on the connecting pipe, two conveying pipes are symmetrically arranged above the placement box, one end of the two conveying pipes is far away from each other and is rotatably connected to the inner wall of the flushing box through a rotating shaft, a plurality of nozzles are arranged on the lower surface of the conveying pipe, the upper end of the nozzle is connected with the inside of the conveying pipe, the conveying pipe is connected with one end of the diverter pipe through a telescopic hose, and the other end of the diverter pipe is connected with the output end of the pump body.

[0013] Preferably, a drain pipe is provided at the bottom of the flushing box, and a drain valve is provided on the drain pipe.

[0014] Preferably, a dryer is arranged outside the flushing box, an air pipe is arranged at the output end of the dryer, the other end of the air pipe is connected to the shunt pipe, and a second valve is arranged on the air pipe.

[0015] Preferably, a driving mechanism is arranged in the flushing box, and the driving mechanism is used to drive the conveying pipe to rotate. The driving mechanism includes a first driving motor, the first driving motor is arranged on the inner wall of the rear side of the flushing box, a first rotating shaft is arranged at the output end of the first driving motor, a first pulley is arranged on the first rotating shaft, a second pulley is arranged above the first pulley, the second pulley is rotatably connected to the inner wall of the flushing box through the second rotating shaft, third rotating shafts are symmetrically arranged on both sides of the second rotating shaft, the third rotating shaft is rotatably connected to the inner wall of the flushing box, a third pulley is arranged on the third rotating shaft, and the first pulley, the second pulley and the third pulley are connected by a transmission belt. A cam is arranged on the third rotating shaft, a fixed plate is arranged under the cam, the fixed plate is fixedly connected to the inner wall of the flushing box, a sliding hole is arranged at the center of the fixed plate, a sliding rod is slidably arranged in the sliding hole, the upper end of the sliding rod extends to the bottom of the cam and a contact plate is arranged, the contact plate contacts the outer wall of the cam, the lower end of the sliding rod extends to the bottom of the fixed plate and a sliding sleeve is arranged, the sliding rod is rotatably connected to the side wall of the sliding sleeve, the sliding sleeve is arranged on the outside of the conveying pipe, the outer wall of the conveying pipe is slidably connected to the inner wall of the sliding sleeve, a compression spring is arranged on the outside of the sliding rod, one end of the compression spring is connected to the contact plate, and the other end of the compression spring is connected to the fixed plate.

[0016] The technical solution of the present invention has the following advantages: the present invention provides a method for removing arsenic elements from a flat plate catalyst, and relates to the technical field of resource utilization of denitration catalysts, comprising the following steps: screening and deashing the arsenic-containing flat plate catalyst and then grinding it to form a waste catalyst material; then mixing the waste catalyst material with sodium carbonate and roasting it, and then washing the roasted mixed material, the washing comprising first washing the mixed material with water, then drying the washed mixed material and then acid washing it, and washing it again after the acid washing is completed to form a mixed liquid; performing solid-liquid separation on the mixed liquid to obtain a filtrate and a filter residue; filtering the filter residue to obtain a powder, drying the powder and then grinding it to obtain a denitration catalyst raw material; evaporating and crystallizing the filtrate, and then filtering and drying the finished product to obtain tungsten trioxide. In the present invention, by mixing and roasting the waste catalyst material with sodium carbonate, the arsenic-containing oxide in the waste catalyst material can be converted into arsenic-containing salt substances, and the arsenic-containing salt substances can be removed by washing to avoid mixing into the denitration catalyst raw material, thereby ensuring the denitration effect of the new denitration catalyst and improving the resource utilization effect.

[0017] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the devices particularly pointed out in the written description and the drawings of the description.

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 This is a process flow chart of a method for removing arsenic from a flat plate catalyst according to the present invention;

[0021] Figure 2 It is a schematic diagram of the internal structure of the flushing device in the present invention;

[0022] Figure 3 For the present invention Figure 2 A magnified view of the structure at center;

[0023] Figure 4 It is a schematic diagram of the internal structure of the placement box in the present invention.

[0024] In the figure: 1, flushing box; 2, discharge port; 3, box door; 4, storage box; 5, filter screen; 6, discharge port; 7, material door; 8, liquid storage box; 9, pump body; 10, connecting pipe; 11, conveying pipe; 12, rotating shaft; 13, nozzle; 14, telescopic hose; 15, diverter pipe; 16, discharge pipe; 17, first pulley; 18, second pulley; 19, third pulley; 20, transmission belt; 21, cam; 22, fixed plate; 23, sliding rod; 24, contact plate; 25, sliding sleeve; 26, compression spring; 27, swing plate; 28, first connecting rod ; 29. ​​Second connecting rod; 30. Connecting column; 31. Semicircular gear; 32. Driving gear; 33. Slide; 34. Sliding column; 35. Fixed block; 36. Return spring; 37. First rack; 38. Second rack; 39. Fan gear; 40. Fourth shaft; 41. Swing rod; 42. First slide column; 43. Connecting plate; 44. Toggle plate; 45. Scraper; 46. Connecting spring; 47. Driving plate; 48. Second slide column; 49. Moving plate; 50. Moving block; 51. Reciprocating screw; 52. Second driving motor; 53. Guide rod. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0026] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] Example 1

[0028] The present invention provides a method for removing arsenic from a flat plate catalyst. Figure 1 As shown, the process comprises the following steps: screening and removing ash from the arsenic-containing flat plate catalyst and then grinding it to form a waste catalyst material; then mixing the waste catalyst material with sodium carbonate and roasting it, and then washing the roasted mixture, wherein the washing comprises first washing the mixture with water, then drying the washed mixture and then acid washing it, and then washing it with water again after the acid washing is completed to form a mixed liquid; performing solid-liquid separation on the mixed liquid to obtain a filtrate and a filter residue; filtering the filter residue to obtain a powder, drying the powder and then grinding it to obtain a denitration catalyst raw material; evaporating and crystallizing the filtrate, and then filtering and drying the finished product to obtain tungsten trioxide;

[0029] Wherein, the particle size of the spent catalyst material is 30-60 mesh;

[0030] The spent catalyst material and sodium carbonate are mixed in a mass ratio of 1 to 0.1;

[0031] The spent catalyst material is mixed with sodium carbonate and calcined at a temperature of 750-850°C;

[0032] The mixed material is pickled with a 5% dilute sulfuric acid solution;

[0033] The finished product is then dried and calcined at a temperature of 400-500°C.

[0034] The working principle and beneficial effects of the above technical solution are as follows: the main components of the flat plate catalyst are TiO2, WO3, V2O5, SiO2, Al2O3, Na2O, K2O, As2O3 and other substances. When the flat plate catalyst is poisoned by arsenic, the arsenic-containing flat plate catalyst is first screened and deashed, and then ground to form a waste catalyst material. The particle size of the waste catalyst material after grinding is 30-60 mesh; then the waste catalyst material is mixed with sodium carbonate in a mass ratio of 1 to 0.1, and the mixture is melt-calcined. The sodium carbonate is decomposed into sodium oxide and carbon dioxide by heat, and the sodium oxide reacts with the arsenic oxide in the waste flat plate catalyst powder to generate arsenic salt substances. The roasting temperature is 750-850°C, preferably 800°C, and the roasting time can be 4-6h, and then rinse the calcined mixed material. The rinsing includes washing the mixed material with water until the pH is neutral, and then drying the washed mixed material and acid-washing the mixed material with 5% dilute sulfuric acid solution. Under acidic conditions, arsenic salts are easy to react with acid to generate soluble arsenates or arsenites, which are then washed away. After the acid washing is completed, wash it with water again until the pH is neutral to form a mixed solution; separate the solid and liquid of the mixed solution to obtain a filtrate and a filter residue; filter the filter residue to obtain a powder, dry the powder and grind it to obtain a denitration catalyst raw material; evaporate and crystallize the filtrate, and then dry the finished product after filtering. After the finished product is dried, roast it at a temperature of 400-500°C and a roasting time of 1-5h to finally obtain tungsten trioxide. In the present invention, by mixing and roasting the waste catalyst material with sodium carbonate, the arsenic oxide in the waste catalyst material can be converted into arsenic salt substances, which can be removed by washing to prevent the arsenic oxide from mixing into the denitration catalyst raw material, thereby ensuring the denitration effect of the new denitration catalyst. In addition, the denitration catalyst raw material and tungsten trioxide can be obtained through the above scheme, and the denitration catalyst raw material is used to prepare a new denitration catalyst, thereby improving the resource utilization effect of the waste flat-plate catalyst.

[0035] Example 2

[0036] On the basis of the above-mentioned embodiment 1, Figure 2-Figure 4As shown, a flushing device is used to flush the mixed material, and the flushing device includes a flushing box 1, discharge ports 2 are arranged on the left and right sides of the flushing box 1, a box door 3 is arranged at the discharge port 2, a placement box 4 is arranged in the flushing box 1, a filter screen 5 is arranged at the bottom of the placement box 4, discharge ports 6 are arranged on the left and right sides of the placement box 4, a material door 7 is arranged at the discharge port 6, a flushing port is arranged at the upper end of the placement box 4, two liquid storage tanks 8 are arranged on the flushing box 1, a pump body 9 is arranged between the two liquid storage tanks 8, the liquid storage tank 8 is connected with the input end of the pump body 9 through a connecting pipe 10, a first valve is arranged on the connecting pipe 10, two conveying pipes 11 are symmetrically arranged above the placement box 4, one end of the two conveying pipes 11 is away from each other and is rotatably connected to the inner wall of the flushing box 1 through a rotating shaft 12, a plurality of nozzles 13 are arranged on the lower surface of the conveying pipe 11, the upper end of the nozzle 13 is connected with the inside of the conveying pipe 11, the conveying pipe 11 is connected with one end of the diverter pipe 15 through a telescopic hose 14, and the other end of the diverter pipe 15 is connected with the output end of the pump body 9.

[0037] The working principle and beneficial effects of the above technical solution are as follows: the flushing device is used to flush the mixed material, wherein one liquid storage tank 8 stores clean water, and the other liquid storage tank 8 stores a 5% dilute sulfuric acid solution. The flushing process includes a water washing-drying-acid washing-water washing process, and the flushing process can be completed in the flushing device, thereby reducing the number of loading and unloading times and improving the flushing efficiency. Taking the first water washing as an example, the mixed material is first loaded into the placement box 4, and then the first valve on the connecting pipe 10 connected to the liquid storage tank 8 storing clean water is opened, the pump body 9 is started, and the clean water enters the pump body 9 through the connecting pipe 10, and then is diverted to the two telescopic hoses 14 through the diverter pipe 15, and is transported to the delivery pipe 1 through the telescopic hose 14. 1, and then spray the mixed material in the placement box 4 from the nozzle 13, so as to rinse the mixed material. The rinsed liquid flows to the bottom of the rinse box 1 through the filter 5. The flushing method of the nozzle 13 can save clean water and achieve energy saving. Similarly, when pickling, the first valve on the connecting pipe 10 connected to the clean water storage tank 8 is closed, and the first valve on the connecting pipe 10 connected to the dilute sulfuric acid solution storage tank 8 is opened, so that the switching between clean water and dilute sulfuric acid solution can be realized, and the pickling of the mixed material can be realized, so as to clean and remove the arsenic salt substances in the mixed material; by arranging the filter 5 at the bottom of the placement box 4, the filter 5 can intercept part of the filter residue, so as to improve the subsequent solid-liquid separation efficiency.

[0038] Example 3

[0039] On the basis of Example 2, Figure 2 As shown, a drain pipe 16 is provided at the bottom of the flushing box 1, and a drain valve is provided on the drain pipe 16.

[0040] The working principle and beneficial effects of the above technical solution are as follows: the mixed liquid after flushing is stored at the bottom of the flushing tank 1, and the mixed liquid can be discharged by opening the drain valve, which makes it easy to obtain the mixed liquid and provides convenience for the subsequent solid-liquid separation of the mixed liquid.

[0041] Example 4

[0042] On the basis of Embodiment 2 or 3, a dryer is arranged outside the flushing box 1, an air pipe is arranged at the output end of the dryer, the other end of the air pipe is connected to the shunt pipe 15, and a second valve is arranged on the air pipe.

[0043] The working principle and beneficial effects of the above technical solution are as follows: after the first water washing, the mixed material needs to be dried. At this time, the first valve is closed, and then the second valve and the dryer are opened. The drying gas can flow into the diversion pipe 15 through the air pipe, and then flow into the delivery pipe 11 through the telescopic hose 14, and finally sprayed from the nozzle 13 to the mixed material in the placement box 4. The drying gas can dry the mixed material in the placement box 4, and there is no need to take out the mixed material after the first water washing and then dry it, which improves the drying speed and greatly improves the production efficiency.

[0044] Example 5

[0045] On the basis of any one of Examples 2-4, Figure 2 , Figure 3 As shown, a driving mechanism is arranged in the flushing box 1, and the driving mechanism is used to drive the conveying pipe 11 to rotate. The driving mechanism includes a first driving motor, and the first driving motor is arranged on the inner wall of the rear side of the flushing box 1. A first rotating shaft is arranged at the output end of the first driving motor, and a first pulley 17 is arranged on the first rotating shaft. A second pulley 18 is arranged above the first pulley 17, and the second pulley 18 is rotatably connected to the inner wall of the flushing box 1 through the second rotating shaft. Third rotating shafts are symmetrically arranged on both sides of the second rotating shaft, and the third rotating shaft is rotatably connected to the inner wall of the flushing box 1. A third pulley 19 is arranged on the third rotating shaft, and the first pulley 17, the second pulley 18 and the third pulley 19 are connected through a transmission belt 20 for transmission, and a cam 21 is arranged on the third rotating shaft. A fixed plate 22 is arranged below the wheel 21, and the fixed plate 22 is fixedly connected to the inner wall of the flushing box 1. A sliding hole is arranged at the center of the fixed plate 22, and a sliding rod 23 is slidingly arranged in the sliding hole. The upper end of the sliding rod 23 extends to the bottom of the cam 21 and is provided with a contact plate 24, and the contact plate 24 contacts the outer wall of the cam 21. The lower end of the sliding rod 23 extends to the bottom of the fixed plate 22 and is provided with a sliding sleeve 25. The sliding rod 23 is rotatably connected to the side wall of the sliding sleeve 25, and the sliding sleeve 25 is sleeved on the outside of the conveying pipe 11. The outer wall of the conveying pipe 11 is slidably connected to the inner wall of the sliding sleeve 25. A compression spring 26 is sleeved on the outside of the sliding rod 23, and one end of the compression spring 26 is connected to the contact plate 24, and the other end of the compression spring 26 is connected to the fixed plate 22.

[0046] The working principle and beneficial effects of the above technical solution are as follows: when the nozzle 13 sprays fluid, the first drive motor is started, and the rotation of the first drive motor drives the first rotating shaft to rotate, and the rotation of the first rotating shaft drives the first pulley 17 to rotate, and the rotation of the first pulley 17 drives the third pulley 19 and the second pulley 18 to rotate through the transmission belt 20, and the rotation of the third pulley 19 drives the third rotating shaft to rotate, and the rotation of the third rotating shaft drives the cam 21 to rotate, and the cam 21 contacts the contact plate 24, and under the action of the compression spring 26, the cam 21 can drive the contact plate 24 to reciprocate up and down above the fixed plate 22, and the contact plate 24 drives the sliding rod 23 to reciprocate up and down, and the sliding rod 23 drives the sliding sleeve 25 to move, and the sliding sleeve 25 can drive the conveying pipe 11 to swing up and down with the rotating shaft 12 as the center, thereby adjusting the spray angle of the nozzle 13, expanding the flushing range, and further improving the flushing efficiency and flushing effect.

[0047] Example 6

[0048] On the basis of Example 5, Figure 2 , Figure 3 As shown, an auxiliary mechanism is arranged above the placement box 4, and the auxiliary mechanism includes two swing plates 27, and the two swing plates 27 are symmetrically arranged on the left and right sides of the diverter pipe 15, and the swing plates 27 are located above the conveying pipe 11. The two swing plates 27 are respectively provided with a first connecting rod 28 close to one end of each other, one end of the first connecting rod 28 is hingedly connected to the end of the swing plate 27, and the other end of the first connecting rod 28 is rotatably connected to the inner wall of the flushing box 1, and a second connecting rod 29 is arranged between the swing plate 27 and the cam 21, one end of the second connecting rod 29 is hingedly connected to the swing plate 27 near the middle position, and the other end of the second connecting rod 29 is rotatably connected to the eccentric position of the rear side wall of the cam 21.

[0049] The working principle and beneficial effects of the above technical solution are as follows: when the cam 21 rotates, it can drive the second connecting rod 29 to move, and the second connecting rod 29 drives the swing plate 27 to swing. When the swing plate 27 swings, it can fan the air in the flushing box 1, thereby generating airflow. The airflow impacts the fluid sprayed from the nozzle 13, thereby dispersing the sprayed fluid, further expanding the flushing range.

[0050] Example 7

[0051] On the basis of any one of Examples 2-6, Figure 2 , Figure 4As shown, connecting columns 30 are respectively arranged on the inner walls of the front and rear sides of the flushing box 1, and the two connecting columns 30 are symmetrically arranged front and back. One end of the connecting column 30 is fixedly connected to the inner wall of the flushing box 1, and the other end of the connecting column 30 is rotatably connected to the outer wall of the placement box 4. A semicircular gear 31 is arranged on the connecting column 30, and a rotating column is arranged above the semicircular gear 31. One end of the rotating column is rotatably connected to the outer wall of the placement box 4. A driving gear 32 is arranged on the rotating column, and the driving gear 32 is meshed with the semicircular gear 31. A slide 33 is arranged above the driving gear 32, and the slide 33 is slidably arranged on the sliding column 34. The two ends of the sliding column 34 are respectively connected to the fixed block 35 The fixed block 35 is arranged on the upper surface of the placement box 4, and the return springs 36 are symmetrically arranged on both sides of the slide 33. The return springs 36 are sleeved on the sliding column 34. One end of the return spring 36 is connected to the slide 33, and the other end of the return spring 36 is connected to the fixed block 35. A first rack 37 is arranged at one end of the slide 33 close to the driving gear 32. The first rack 37 is meshed with the driving gear 32. A second rack 38 is arranged at the other end of the slide 33. The second rack 38 is meshed with a fan gear 39. The fan gear 39 is connected to a fourth rotating shaft 40. The fourth rotating shaft 40 is rotatably connected to the inner wall of the placement box 4. The lower side wall of the fourth rotating shaft 40 is arranged A swing rod 41 is provided with a first rectangular hole near the lower end of the swing rod 41, a first slide column 42 is slidably provided in the first rectangular hole, one end of the first slide column 42 is connected to a connecting plate 43, a lower end of the connecting plate 43 is connected to a toggle plate 44, a sliding cavity is provided in the toggle plate 44, a scraper 45 is slidably provided in the sliding cavity, the scraper 45 is connected to the top wall of the sliding cavity through a connecting spring 46, the lower end of the scraper 45 contacts the upper surface of the filter 5, a driving plate 47 is provided on the lower side wall of the placement box 4, an upper end of the driving plate 47 is fixedly connected to the lower side wall of the placement box 4, a second rectangular hole is provided in the driving plate 47, a second slide column is slidably provided in the second rectangular hole 48. One end of the second sliding column 48 is connected to the moving plate 49, and the lower end of the moving plate 49 is connected to the moving block 50. The moving block 50 is slidably set on the reciprocating screw 51. The reciprocating screw 51 is located below the placement box 4. One end of the reciprocating screw 51 is rotatably connected to the side wall of the placement box 4, and the other end of the reciprocating screw 51 is connected to the output end of the second drive motor 52. The second drive motor 52 is arranged outside the flushing box 1. A guide hole is set in the moving block 50. The moving block 50 is slidably connected to the guide rod 53 through the guide hole. The guide rod 53 is parallel to the reciprocating screw 51, and the left and right ends of the guide rod 53 are respectively connected to the inner wall of the flushing box 1.

[0052] The working principle and beneficial effects of the above technical solution are as follows: when flushing, the second drive motor 52 is started, the second drive motor 52 rotates to drive the reciprocating screw 51 to rotate, and under the guidance of the guide rod 53, the reciprocating screw 51 rotates to drive the moving block 50 to reciprocate along the axial direction of the reciprocating screw 51, the moving block 50 drives the moving plate 49 to move, the moving plate 49 drives the second slide post 48 to move, the second slide post 48 is slidably arranged in the second rectangular hole of the driving plate 47, and when the second slide post 48 moves, it slides in the second rectangular hole and drives the driving plate 47 to the left and right. The driving plate 47 drives the placing box 4 to swing back and forth left and right with the connecting column 30 as the center, and the mixed material in the placing box 4 slides on the filter screen 5. During the sliding process, the nozzle 13 continuously sprays fluid to improve the washing effect of the mixed material. Similarly, the drying efficiency can be improved during drying. When the placing box 4 swings left and right, the driving gear 32 meshes with the semicircular gear 31, and the driving gear 32 rolls along the outer wall of the semicircular gear 31. The driving gear 32 rotates to drive the first rack 37 to reciprocate left and right, and the first rack 37 drives the sliding The platform 33 slides on the upper surface of the placement box 4, and the slide 33 drives the second rack 38 to reciprocate left and right. The second rack 38 drives the fan gear 39 to swing by meshing with the fan gear 39. The fan gear 39 drives the swing rod 41 to swing back and forth left and right through the fourth rotating shaft 40. The swing rod 41 drives the first slide post 42 to move through the first rectangular hole. The first slide post 42 drives the toggle plate 44 to toggle the mixed material in the placement box 4 through the connecting plate 43. At the same time, the toggle plate 44 drives the scraper 45 to scrape the mixed material accumulated on the filter screen 5 to prevent the filter screen from being blocked. 5 is blocked, thereby extending the service life of the filter screen 5; when the toggle plate 44 is tilted to the maximum angle, the mixed material can flow to the other side of the placement box 4 through the scraper 45. Under the reciprocating toggle of the toggle plate 44, the mixed material in the placement box 4 can be turned over, so that the mixed material is fully in contact with the cleaning liquid, further improving the flushing effect and flushing efficiency, improving the cleaning and removal effect of arsenic salt substances, avoiding arsenic oxides from mixing into the denitration catalyst raw materials, ensuring the denitration effect of the new denitration catalyst, and improving the resource utilization effect of the waste flat-plate catalyst.

[0053] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A method for removing arsenic from a flat plate catalyst, characterized in that: The following steps are involved: The arsenic-containing flat plate catalyst is screened, deashed and then ground to form a waste catalyst material; the waste catalyst material is then mixed with sodium carbonate and roasted, and the roasted mixture is rinsed, the rinse includes first washing the mixture with water, then drying the washed mixture and then acid washing, and then washing it again after the acid washing is completed to form a mixed liquid; the mixed liquid is subjected to solid-liquid separation to obtain a filtrate and a filter residue; the filter residue is filtered to obtain a powder, the powder is dried and ground to obtain a denitration catalyst raw material; the filtrate is evaporated and crystallized, and then filtered and the finished product is dried to obtain tungsten trioxide.

2. The method for removing arsenic from a flat plate catalyst according to claim 1, characterized in that: The particle size of the spent catalyst material is 30-60 mesh.

3. The method for removing arsenic from a flat plate catalyst according to claim 1, characterized in that: The spent catalyst material is mixed with sodium carbonate in a mass ratio of 1 to 0.

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4. The method for removing arsenic from a flat plate catalyst according to claim 1, characterized in that: The spent catalyst material is mixed with sodium carbonate and calcined at a temperature of 750-850°C.

5. The method for removing arsenic from a flat plate catalyst according to claim 1, characterized in that: The mixed material is pickled with a 5% dilute sulfuric acid solution.

6. The method for removing arsenic from a flat plate catalyst according to claim 1, characterized in that: The finished product is then dried and calcined at a temperature of 400-500°C.

7. The method for removing arsenic from a flat plate catalyst according to claim 1, characterized in that: A flushing device is used to flush the mixed material. The flushing device comprises a flushing box (1). The flushing box (1) is provided with discharge ports (2) on both sides. A box door (3) is provided at the discharge port (2). A placement box (4) is provided in the flushing box (1). A filter screen (5) is provided at the bottom of the placement box (4). Discharge ports (6) are provided on both sides of the placement box (4). A material door (7) is provided at the discharge port (6). A flushing port is provided at the upper end of the placement box (4). Two liquid storage tanks (8) are provided on the flushing box (1). A pump body (9) is provided between the two liquid storage tanks (8). The liquid storage tanks (8) are connected to the pump body (9). A through pipe (10) is connected to the input end of the pump body (9), a first valve is arranged on the connecting pipe (10), two delivery pipes (11) are symmetrically arranged above the placement box (4), one end of the two delivery pipes (11) is away from each other and is rotatably connected to the inner wall of the flushing box (1) through a rotating shaft (12), a plurality of nozzles (13) are arranged on the lower surface of the delivery pipe (11), the upper end of the nozzle (13) is connected to the inside of the delivery pipe (11), the delivery pipe (11) is connected to one end of a diverter pipe (15) through a telescopic hose (14), and the other end of the diverter pipe (15) is connected to the output end of the pump body (9).

8. The method for removing arsenic from a flat plate catalyst according to claim 7, characterized in that: A liquid discharge pipe (16) is arranged at the bottom of the flushing box (1), and a liquid discharge valve is arranged on the liquid discharge pipe (16).

9. The method for removing arsenic from a flat plate catalyst according to claim 7, characterized in that: A dryer is arranged outside the flushing box (1), an air pipe is arranged at the output end of the dryer, the other end of the air pipe is connected to the shunt pipe (15), and a second valve is arranged on the air pipe.

10. The method for removing arsenic from a flat plate catalyst according to claim 7, characterized in that: A driving mechanism is arranged in the flushing box (1), and the driving mechanism is used to drive the conveying pipe (11) to rotate. The driving mechanism comprises a first driving motor, and the first driving motor is arranged on the inner wall of the rear side of the flushing box (1). A first rotating shaft is arranged at the output end of the first driving motor, and a first belt pulley (17) is arranged on the first rotating shaft, and a second belt pulley (18) is arranged above the first belt pulley (17). The second belt pulley (18) is rotatably connected to the inner wall of the flushing box (1) through the second rotating shaft, and third rotating shafts are symmetrically arranged on both sides of the second rotating shaft, and the third rotating shaft is rotatably connected to the inner wall of the flushing box (1), and a third belt pulley (19) is arranged on the third rotating shaft. The first belt pulley (17), the second belt pulley (18) and the third belt pulley (19) are connected by a transmission belt (20). A cam (21) is arranged on the third rotating shaft, and a fixing plate is arranged below the cam (21). (22), the fixed plate (22) is fixedly connected to the inner wall of the flushing box (1), a sliding hole is arranged at the center of the fixed plate (22), a sliding rod (23) is slidably arranged in the sliding hole, the upper end of the sliding rod (23) extends to the bottom of the cam (21) and is provided with a contact plate (24), the contact plate (24) contacts the outer wall of the cam (21), the lower end of the sliding rod (23) extends to the bottom of the fixed plate (22) and is provided with a sliding sleeve (25), the sliding rod (23) is rotatably connected to the side wall of the sliding sleeve (25), the sliding sleeve (25) is sleeved on the outside of the conveying pipe (11), the outer wall of the conveying pipe (11) is slidably connected to the inner wall of the sliding sleeve (25), a compression spring (26) is sleeved on the outside of the sliding rod (23), one end of the compression spring (26) is connected to the contact plate (24), and the other end of the compression spring (26) is connected to the fixed plate (22).

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