A waste mercury catalyst recovery and treatment device and method

Abstract

The invention discloses a waste mercury catalyst recovery and treatment device and method, and relates to the technical field of waste mercury catalyst recovery; the device comprises a calcining furnace, a recovery furnace is connected to the top of the calcining furnace, a dry distillation tube is arranged inside the recovery furnace; a cleaning mechanism is arranged on the top cover, the cleaning mechanism comprises a counterweight push seat hoisted on the top cover, and the inner wall of the dry distillation tube is cleaned by the counterweight push seat; a scraping and unloading mechanism is arranged at the bottom end of the dry distillation tube, the scraping and unloading mechanism comprises a matching conical seat slidably matched at the bottom end of the dry distillation tube, and a scraping frame rotatably mounted on the inner side of the bottom end of the dry distillation tube, and a pressing mechanism is arranged inside the matching conical seat; a calcining tube is slidably arranged inside the calcining furnace, and materials fall from the dry distillation tube into the calcining tube; the invention can perform secondary calcination on the waste mercury catalyst, and the index is far better than the original recovered mercury catalyst level, and the process is compact, there is no cumbersome transfer and transportation process, and it is convenient for unloading and maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of waste mercury catalyst recovery, and in particular to a waste mercury catalyst recovery and treatment device and method. Background Art

[0002] The recycling of waste mercury catalysts involves a special chemical treatment process that aims to extract mercury from used catalysts and safely dispose of it, while recovering and reusing other useful components as much as possible; the recycling of waste mercury catalysts is a complex technical task that usually requires special equipment and expertise to perform. During implementation, the principles of safety and environmental protection must be strictly followed to ensure the effectiveness and safety of the treatment process. At present, the recycling of waste mercury catalysts generally uses a retort furnace to calcine the waste mercury catalyst and then discharge it, cools down the residual temperature, and then packages it, sells it out or processes it. The indicators can only meet the indicators of waste mercury catalysts, and cannot reach the indicators of new mercury catalysts; and during the treatment process, the unloading and transportation process of the materials is complicated, easy to block and inconvenient to clear and maintain; based on this, the present invention proposes a recycling and treatment method for waste mercury catalysts, which can perform secondary calcination on waste mercury catalysts, and the indicators are far better than the original recovered mercury catalyst level, and the process is compact, without cumbersome transfer and transportation processes, which is convenient for unloading and maintenance. Summary of the invention

[0003] In order to solve the above technical problems, the waste mercury catalyst can be subjected to secondary calcination, with indicators far superior to those of the original recovered mercury catalyst. The process is compact, without complicated transfer and transportation procedures, and is easy to unload and maintain.

[0004] The scheme used in the present invention is: a waste mercury catalyst recovery and treatment device, including a calcining furnace, a recovery furnace is connected to the top of the calcining furnace, a heating tube 2 is arranged inside the calcining furnace, a top cover is rotatably arranged on the top of the recovery furnace, a heating tube 1 is arranged in an array inside the recovery furnace, and a dry distillation tube is arranged inside the recovery furnace, and the dry distillation tube is located on the inner side of the heating tube 1; a cleaning mechanism is arranged on the top cover, and the cleaning mechanism includes a counterweight push seat hoisted on the top cover, and the inner wall of the dry distillation tube is cleaned by the counterweight push seat; A scraping and unloading mechanism is arranged at the bottom end of the distillation cylinder, and the scraping and unloading mechanism comprises a matching conical seat which is slidably fitted on the bottom end of the distillation cylinder, and a scraping frame which is rotatably installed on the inner side of the bottom end of the distillation cylinder, and a clamping mechanism is arranged inside the matching conical seat, and the matching conical seat cooperates with the bottom end of the distillation cylinder, and the clamping mechanism presses the lower end surface of the scraping frame to drive the scraping frame to rotate; a calcining cylinder is slidably arranged inside the calcining furnace, and the material falls from the distillation cylinder into the calcining cylinder, and a pushing mechanism is arranged at one end of the calcining furnace for pushing the calcining cylinder.

[0005] Furthermore, the recovery furnace is connected to an absorption transmission device 1 for collecting waste gas; the calcining furnace is connected to a supplementary transmission device and an absorption transmission device 2, the supplementary transmission device is used to transmit supplementary oxygen, and the absorption transmission device 2 is used to collect waste gas.

[0006] Furthermore, the cleaning mechanism includes a lifting motor and a lifting drum arranged in an array on the top cover, the lifting motor is used to drive the lifting drum, a lifting rope is provided on the lifting drum, the free end of the lifting rope is connected to the counterweight push seat, and the top cover is fixed to the recovery furnace by a latch.

[0007] Furthermore, the scraping and unloading mechanism includes a mounting plate arranged inside the recovery furnace, a unloading cylinder is arranged on the mounting plate, a unloading mounting seat is arranged on the telescopic rod of the unloading cylinder, a rotating motor is arranged on the unloading mounting seat, and the rotating motor is used to drive the matching conical seat.

[0008] Furthermore, the clamping mechanism includes a clamping motor fixedly arranged inside the mating conical seat, a clamping turntable is arranged on the output shaft of the clamping motor, a connecting rod is rotatably mounted on the clamping turntable, a radial slide is slidably mounted inside the mating conical seat, the radial slide is rotatably connected to one end of the connecting rod, and a push wheel is arranged at one end of the radial slide.

[0009] Furthermore, the clamping mechanism includes a pressure rod slidably installed inside the matching conical seat, and a pushing part is provided on the pressure rod. The pushing part is pushed by a push wheel to move the pressure rod, and a spring for providing elastic force is connected between the pushing part and the matching conical seat.

[0010] Furthermore, a baffle motor and a discharge baffle are arranged between the recovery furnace and the calcining furnace. The baffle motor is used to drive the discharge baffle, and the release of materials is controlled by the discharge baffle. A buffer mechanism is arranged at the discharge end of the calcining furnace. The buffer mechanism includes a buffer plate slidably arranged on the outside of the discharge end of the calcining furnace, and a buffer spring is sleeved on the buffer plate to provide buffer elastic force.

[0011] Furthermore, a slide groove is arranged inside the calcining furnace, a pulley is arranged on the calcining cylinder, the pulley moves in the slide groove, a clamping part is arranged at one end of the calcining cylinder, and the clamping part cooperates with the pushing mechanism to control the movement of the calcining cylinder.

[0012] Furthermore, the pushing mechanism comprises a pushing oil cylinder arranged at one end of the calcining furnace, a matching seat is arranged on the telescopic rod of the pushing oil cylinder, an electromagnetic clamping rod is arranged on the matching seat, and the electromagnetic clamping rod is used to clamp the clamping part.

[0013] A method for recovering and treating waste mercury catalyst comprises the following steps:

[0014] N10: After the waste mercury catalyst is recovered, it is heated at high temperature in a dry distillation recovery furnace. The material is placed in the recovery furnace, and the furnace body is sealed to isolate it from the outside world to ensure that the waste mercury catalyst is heated in a nearly oxygen-free environment. After the addition is completed, a certain amount of nitrogen is added to prevent the activated carbon from burning into powder.

[0015] N20: The material is transferred to a high-temperature furnace for secondary calcination, and oxygen is introduced to increase the temperature in the furnace. The waste mercury catalyst is discharged after secondary high-temperature calcination;

[0016] The original indicators without secondary calcination are: iodine value 300-400 mg / g, strength 95%, CTC <2%, specific surface area 500 m 2 / g, after secondary calcination, the current indicators are: iodine value 800-1050mg / g, strength 95%, CTC>40%, specific surface area 600-800m 2 / g, which can be sold as a product; after secondary calcination, although it cannot be compared with the new activated carbon indicators, it is far better than the original recovered mercury catalyst level.

[0017] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention recovers the waste mercury catalyst, and the current indicators after secondary calcination are: iodine value 800-1050mg / g, strength 95%, CTC>40%, specific surface area 600-800m 2 / g, which can be sold as a product; after secondary calcination, although it cannot be compared with the new activated carbon index, it is far better than the original recovered mercury catalyst level; (2) The process of the present invention is compact and continuous. The mercury catalyst discharged from the retort furnace has a residual high temperature of more than 800 degrees. It does not need to be cooled and quickly enters the high-temperature furnace. Its residual temperature is used and oxygen is added for secondary calcination, eliminating the cumbersome transfer and transportation process; (3) The oil cylinder is pushed to control the movement of the calcination cylinder to shake the material to ensure that the accumulated material is dispersed and fully calcined; (4) The pressure rod The bottom of the scraper frame is contacted and pressed, and when the conical seat rotates, the scraper frame can be driven to rotate. The scraper frame rotates inside the bottom end of the distillation barrel to stir and scrape the material. Combined with the mutual sliding of the conical seat and the bottom end of the distillation barrel, the material can be fully unloaded without any residue. Furthermore, the hoisting reel can be driven by the hoisting motor to control the lifting and lowering of the counterweight push seat. The counterweight push seat slides in cooperation with the inner side of the distillation barrel, and the residual material on the inner side of the distillation barrel can be pushed and scraped off, which can prevent material residue and facilitate subsequent maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the internal structure of the recovery furnace of the present invention.

[0020] Figure 3 It is a schematic diagram of the structure of the dry distillation cylinder of the present invention.

[0021] Figure 4 It is a schematic diagram of the structure of the cleaning mechanism of the present invention.

[0022] Figure 5 It is a schematic diagram of the bottom structure of the dry distillation cylinder of the present invention.

[0023] Figure 6 It is a schematic diagram of the structure of the scraping and unloading mechanism of the present invention.

[0024] Figure 7 It is a schematic diagram of the structure of the clamping mechanism of the present invention.

[0025] Figure 8 It is a partial schematic diagram of the overall structure of the present invention.

[0026] Fig. 9 It is a schematic diagram of the structure of the calcining furnace of the present invention.

[0027] Fig.10 It is a schematic diagram of the internal structure of the calcining furnace of the present invention.

[0028] Fig.11 It is a schematic diagram of the structure of the calcining tube of the present invention.

[0029] 1-recovery furnace; 2-top cover; 3-absorption and transmission equipment one; 4-absorption and transmission equipment two; 5-supplementary transmission equipment; 6-calcining furnace; 7-buffer plate; 8-buffer spring; 9-heating tube one; 10-counterweight push seat; 11-hoisting motor; 12-hoisting reel; 13-retorting tube; 15-mounting plate; 16-unloading cylinder; 17-unloading mounting seat; 18-rotating motor; 19-matching conical seat; 20-scraping frame; 21-pressing motor; 22-pressing turntable; 23-connecting rod; 24-radial slide; 25-push wheel; 26-pressure rod; 27-pushing part; 28-spring one; 29-baffle motor; 30-unloading baffle; 31-pushing cylinder; 32-calcining tube; 33-pulley; 34-matching seat; 35-electromagnetic clamping rod; 36-heating tube two; 37-clamping part. DETAILED DESCRIPTION

[0030] Example: Figures 1 to 11 As shown, a recovery furnace 1 is connected to the top of the calcining furnace 6, a heating tube 36 is arranged inside the calcining furnace 6, a top cover 2 is rotatably arranged on the top of the recovery furnace 1, a heating tube 9 is arranged in an array on the inner side of the recovery furnace 1, and a distillation tube 13 is arranged inside the recovery furnace 1, and the distillation tube 13 is located on the inner side of the heating tube 9; the recovery furnace 1 is connected to an absorption transmission device 3 for collecting waste gas; the calcining furnace 6 is connected to a supplementary transmission device 5 and an absorption transmission device 4, the supplementary transmission device 5 is used to transmit supplementary oxygen, and the absorption transmission device 4 is used to collect waste gas.

[0031] A cleaning mechanism is provided on the top cover 2, and the cleaning mechanism includes a counterweight push seat 10 hoisted on the top cover 2, and the inner wall of the distillation tube 13 is cleaned by the counterweight push seat 10; the cleaning mechanism includes a hoisting motor 11 and a hoisting drum 12 arranged in an array on the top cover 2, the hoisting motor 11 is used to drive the hoisting drum 12, and a hoisting rope is provided on the hoisting drum 12, and the free end of the hoisting rope is connected to the counterweight push seat 10, and the top cover 2 is fixed to the recovery furnace 1 by a latch.

[0032] A scraping and unloading mechanism is provided at the bottom end of the distillation cylinder 13, and the scraping and unloading mechanism includes a matching conical seat 19 that is slidably fitted at the bottom end of the distillation cylinder 13, and a scraping frame 20 that is rotatably installed on the inner side of the bottom end of the distillation cylinder 13; a clamping mechanism is provided inside the matching conical seat 19, and the matching conical seat 19 cooperates with the bottom end of the distillation cylinder 13, and the clamping mechanism presses the lower end surface of the scraping frame 20 to drive the scraping frame 20 to rotate; a calcining cylinder 32 is slidably provided inside the calcining furnace 6, and the material falls from the distillation cylinder 13 into the calcining cylinder 32, and a pushing mechanism is provided at one end of the calcining furnace 6 for pushing the calcining cylinder 32.

[0033] The scraping and unloading mechanism includes a mounting plate 15 arranged inside the recovery furnace 1, a unloading oil cylinder 16 is arranged on the mounting plate 15, a unloading mounting seat 17 is arranged on the telescopic rod of the unloading oil cylinder 16, a rotating motor 18 is arranged on the unloading mounting seat 17, and the rotating motor 18 is used to drive the matching conical seat 19; the pressing mechanism includes a pressing motor 21 fixedly arranged inside the matching conical seat 19, a pressing rotary disk 22 is arranged on the output shaft of the pressing motor 21, and a rotating motor 18 is rotatably mounted on the pressing rotary disk 22. The connecting rod 23 is slidably mounted with a radial slide seat 24 inside the mating conical seat 19. The radial slide seat 24 is rotationally connected to one end of the connecting rod 23, and a push wheel 25 is provided at one end of the radial slide seat 24; the clamping mechanism includes a pressure rod 26 slidably mounted inside the mating conical seat 19, and a pushing portion 27 is provided on the pressure rod 26. The pushing portion 27 is pushed by the push wheel 25 to move the pressure rod 26, and a spring 28 for providing elastic force is connected between the pushing portion 27 and the mating conical seat 19.

[0034] A baffle motor 29 and a discharge baffle 30 are arranged between the recovery furnace 1 and the calcining furnace 6. The baffle motor 29 is used to drive the discharge baffle 30, and the release of the material is controlled by the discharge baffle 30; a buffer mechanism is arranged at the discharge end of the calcining furnace 6, and the buffer mechanism includes a buffer plate 7 slidably arranged on the outside of the discharge end of the calcining furnace 6, and a buffer spring 8 is sleeved on the buffer plate 7 to provide buffering elastic force; a slide groove is arranged inside the calcining furnace 6, and a pulley 33 is arranged on the calcining cylinder 32, and the pulley 33 moves in the slide groove, and a clamping part 37 is arranged at one end of the calcining cylinder 32, and the clamping part 37 cooperates with the pushing mechanism to control the movement of the calcining cylinder 32; the pushing mechanism includes a pushing cylinder 31 arranged at one end of the calcining furnace 6, and a matching seat 34 is arranged on the telescopic rod of the pushing cylinder 31, and an electromagnetic clamping rod 35 is arranged on the matching seat 34, and the electromagnetic clamping rod 35 is used to clamp the clamping part 37.

[0035] The principle of implementing the present invention is as follows: the material is put into the distillation tube 13 from the top of the recovery furnace 1, and then the recovery furnace 1 is sealed and isolated from the outside world, so that the material is heated in an oxygen-free environment; that is, the heating tube 9 works to perform high-temperature heating operation; further, after the heating is completed, the unloading baffle 30 is controlled to rotate by the baffle motor 29, so that the calcining furnace 6 and the recovery furnace 1 are converted into a connected state, and the unloading mounting seat 17 is controlled to move by the unloading cylinder 16, so that the matching conical seat 19 is disengaged from the bottom end of the distillation tube 13, so as to unload the material, that is, transfer it from the distillation tube 13 to the calcining furnace 6; specifically, when unloading, in order to ensure that the material is fully unloaded, the matching conical seat 19 is matched with the bottom end of the distillation tube 13, and the matching conical seat 19 is in contact with the bottom end of the scraper frame 20, and the pressing motor 21 is used. When working, the pressing turntable 22 rotates, and under the connecting action of the connecting rod 23, the radial slide seat 24 and the push wheel 25 slide, and the push wheel 25 pushes the pushing part 27 to make the pressure rod 26 slide, and the pressure rod 26 contacts and presses the bottom of the scraper frame 20, and when the conical seat 19 rotates, the scraper frame 20 can be driven to rotate. The scraper frame 20 rotates inside the bottom end of the distillation cylinder 13, and the material can be stirred and scraped. Combined with the mutual sliding of the conical seat 19 and the bottom end of the distillation cylinder 13, the material can be fully unloaded without residue. Further, the hoisting reel 12 can be driven by the hoisting motor 11 to control the lifting and lowering of the counterweight push seat 10. The counterweight push seat 10 slides with the inner side of the distillation cylinder 13, and the residual material inside the distillation cylinder 13 can be pushed and scraped, which can prevent material residue and facilitate subsequent maintenance.

[0036] The material in the calcining tube 32 is operated through the heating tube 36, which transmits supplementary oxygen to the inside through the supplementary transmission equipment 5 to carry out secondary calcination of the material. During calcination, it can cooperate with the clamping part 37 through the matching seat 34, and the electromagnetic clamping rod 35 clamps and fixes the clamping part 37, that is, the oil cylinder 31 is pushed to control the movement of the calcining tube 32 to shake the material, ensure that the accumulated material is dispersed, and achieve sufficient calcination. Furthermore, when unloading, the unloading port at one end of the calcining furnace 6 is opened, and the calcining tube 32 can be pushed out by pushing the oil cylinder 31. When the calcining tube 32 extends to the outside of the calcining furnace 6, it can be buffered and blocked by the buffer plate 7.

[0037] The recovery method of the present invention comprises the following steps:

[0038] N10: After the waste mercury catalyst is recovered, it is heated at high temperature in a dry distillation recovery furnace. The material is placed in the recovery furnace, and the furnace body is sealed to isolate it from the outside world to ensure that the waste mercury catalyst is heated in a nearly oxygen-free environment. After the addition is completed, a certain amount of nitrogen is added to prevent the activated carbon from burning into powder.

[0039] N20: The material is transferred to a high-temperature furnace for secondary calcination, and oxygen is introduced to increase the temperature in the furnace. The waste mercury catalyst is discharged after secondary high-temperature calcination;

[0040] In the recovery method of the present invention, the original indicators without secondary calcination are: iodine value 300-400 mg / g, strength 95%, CTC <2%, specific surface area 500m 2 / g, after secondary calcination, the current indicators are: iodine value 800-1050mg / g, strength 95%, CTC>40%, specific surface area 600-800m 2 / g, which can be sold as a product; after the second calcination, although it cannot be compared with the new activated carbon indicators, it is far better than the original recovered mercury catalyst level; the process continuity is compact, and the mercury catalyst discharged from the distillation furnace has a residual high temperature of more than 800 degrees. It does not need to be cooled and quickly enters the high-temperature furnace, using its residual temperature and adding oxygen for secondary calcination.

Claims

1. A waste mercury catalyst recovery and treatment device, comprising a calcining furnace (6), a recovery furnace (1) is connected to the calcining furnace (6), a heating tube 2 (36) is arranged inside the calcining furnace (6), a top cover (2) is rotatably arranged on the top of the recovery furnace (1), heating tubes 1 (9) are arranged in an array inside the recovery furnace (1), and a dry distillation tube (13) is arranged inside the recovery furnace (1), and the dry distillation tube (13) is located inside the heating tube 1 (9); the characteristics are: The top cover (2) is provided with a cleaning mechanism, the cleaning mechanism comprising a counterweight push seat (10) hoisted on the top cover (2), and the inner wall of the distillation cylinder (13) is cleaned by the counterweight push seat (10); a scraping and unloading mechanism is provided at the bottom end of the distillation cylinder (13), the scraping and unloading mechanism comprising a matching conical seat (19) slidably fitted on the bottom end of the distillation cylinder (13), and a scraping frame (20) rotatably mounted on the inner side of the bottom end of the distillation cylinder (13), A pressing mechanism is arranged inside the matching conical seat (19), and the matching conical seat (19) cooperates with the bottom end of the dry distillation cylinder (13). The pressing mechanism presses the lower end surface of the scraper frame (20) to drive the scraper frame (20) to rotate. A calcining cylinder (32) is slidably arranged inside the calcining furnace (6), and materials fall from the dry distillation cylinder (13) into the calcining cylinder (32). A pushing mechanism is arranged at one end of the calcining furnace (6) for pushing the calcining cylinder (32).

2. A waste mercury catalyst recovery and treatment device according to claim 1, characterized in that: The recovery furnace (1) is connected to an absorption transmission device 1 (3) for collecting waste gas; the calcining furnace (6) is connected to a supplementary transmission device (5) and an absorption transmission device 2 (4), the supplementary transmission device (5) is used to transmit supplementary oxygen, and the absorption transmission device 2 (4) is used to collect waste gas.

3. The waste mercury catalyst recovery and treatment device according to claim 1, characterized in that: The cleaning mechanism comprises a hoisting motor (11) and a hoisting drum (12) arranged in an array on the top cover (2); the hoisting motor (11) is used to drive the hoisting drum (12); a hoisting rope is provided on the hoisting drum (12); a free end of the hoisting rope is connected to a counterweight push seat (10); and the top cover (2) is fixed to the recovery furnace (1) by means of a latch.

4. The waste mercury catalyst recovery and treatment device according to claim 1, characterized in that: The scraping and unloading mechanism comprises a mounting plate (15) arranged inside the recovery furnace (1), a unloading oil cylinder (16) being arranged on the mounting plate (15), a unloading mounting seat (17) being arranged on the telescopic rod of the unloading oil cylinder (16), a rotating motor (18) being arranged on the unloading mounting seat (17), and the rotating motor (18) being used to drive the matching conical seat (19).

5. The waste mercury catalyst recovery and treatment device according to claim 1, characterized in that: The clamping mechanism comprises a clamping motor (21) fixedly arranged inside the matching conical seat (19), a clamping turntable (22) being arranged on the output shaft of the clamping motor (21), a connecting rod (23) being rotatably mounted on the clamping turntable (22), a radial slide seat (24) being slidably mounted inside the matching conical seat (19), the radial slide seat (24) being rotatably connected to one end of the connecting rod (23), and a push wheel (25) being arranged at one end of the radial slide seat (24).

6. The waste mercury catalyst recovery and treatment device according to claim 1, characterized in that: The clamping mechanism comprises a pressure rod (26) slidably mounted inside the matching conical seat (19), a pushing portion (27) being provided on the pressure rod (26), the pushing portion (27) being pushed by a push wheel (25) to move the pressure rod (26), and a spring (28) for providing elastic force being connected between the pushing portion (27) and the matching conical seat (19).

7. The waste mercury catalyst recovery and treatment device according to claim 1, characterized in that: A baffle motor (29) and a discharge baffle (30) are provided between the recovery furnace (1) and the calcining furnace (6); the baffle motor (29) is used to drive the discharge baffle (30) to control the release of materials through the discharge baffle (30); a buffer mechanism is provided at the discharge end of the calcining furnace (6); the buffer mechanism comprises a buffer plate (7) slidably arranged on the outside of the discharge end of the calcining furnace (6); a buffer spring (8) is sleeved on the buffer plate (7) to provide a buffer elastic force.

8. The waste mercury catalyst recovery and treatment device according to claim 1, characterized in that: The calcining furnace (6) is provided with a chute inside, and a pulley (33) is provided on the calcining tube (32). The pulley (33) moves in the chute. A clamping portion (37) is provided at one end of the calcining tube (32). The clamping portion (37) cooperates with a pushing mechanism to control the movement of the calcining tube (32).

9. The waste mercury catalyst recovery and treatment device according to claim 1, characterized in that: The pushing mechanism comprises a pushing cylinder (31) arranged at one end of the calcining furnace (6); a matching seat (34) is arranged on the telescopic rod of the pushing cylinder (31); an electromagnetic clamping rod (35) is arranged on the matching seat (34); the electromagnetic clamping rod (35) is used to clamp the clamping portion (37).

10. A method for recycling waste mercury catalyst, characterized in that: The following steps are involved: N10: After the waste mercury catalyst is recovered, it is heated at high temperature in a dry distillation recovery furnace. The material is placed in the recovery furnace, and the furnace body is sealed to isolate it from the outside world to ensure that the waste mercury catalyst is heated in a nearly oxygen-free environment. After the addition is completed, a certain amount of nitrogen is added to prevent the activated carbon from burning into powder. N20: The material is transferred to a high-temperature furnace for secondary calcination, and oxygen is introduced to increase the temperature in the furnace. The waste mercury catalyst is discharged after secondary high-temperature calcination; The original indicators without secondary calcination are: iodine value 300-400 mg / g, strength 95%, CTC <2%, specific surface area 500 m 2 / g, after secondary calcination, the current indicators are: iodine value 800-1050mg / g, strength 95%, CTC>40%, specific surface area 600-800m 2 / g.

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