Indirect thermal desorption treatment equipment for mercury-containing polluted soil and solid waste

Abstract

The invention discloses indirect thermal desorption treatment equipment for mercury-containing polluted soil and solid waste. The indirect thermal desorption treatment equipment comprises an equipment box body, a preheating assembly and a thermal desorption assembly, wherein the preheating assembly and the thermal desorption assembly are sequentially arranged in the equipment box body; an exhaust pipe is arranged on the outer side wall of the equipment box body; the preheating assembly comprises a preheating cylinder, a first rotating shaft, a first auger and a first auger motor; a steam generator communicated with the interior of the preheating cylinder is arranged on the outer side wall of the equipment box body; the thermal desorption assembly comprises a heating cylinder, a heat preservation cylinder, a second rotating shaft, a second auger, a second auger motor and a combustion component; the mercury-containing polluted soil thermal desorption remediation device is reasonable in structural design, thermal desorption remediation is conducted on mercury-containing polluted soil in an indirect heating mode, the tail gas generation amount is small, the operation energy consumption of equipment can be reduced, and green and low-carbon effects are achieved; after the mercury-containing polluted soil is repaired by the equipment, the mercury can be recovered to the maximum extent, and the resource utilization of the mercury-containing polluted soil is realized.

Description

Technical Field

[0001] This invention relates to the field of heavy metal remediation technology, specifically to an indirect thermal desorption treatment device for mercury-contaminated soil and solid waste. Background Technology

[0002] Mercury is a global pollutant. Due to its persistence, bioaccumulation, neurotoxicity, and strong mobility, mercury pollution has received widespread attention from scholars worldwide since the Minamata disease in Japan, one of the world's eight major environmental disasters in the 1950s. my country is a major mercury producer, and serious soil mercury pollution has been caused by mercury mining, gold smelting, and the production of mercury products.

[0003] Remediation methods for mercury-contaminated soil mainly include off-site landfill, soil leaching remediation, solidification and stabilization remediation, electrokinetic remediation, bioremediation, and thermal desorption remediation. Among these, thermal desorption technology uses direct or indirect heat exchange to heat the pollutants in the soil to a sufficient temperature, causing the pollutants to volatilize or separate from the soil, and then centrally treats these gaseous pollutants. Due to its good treatment effect, short treatment time, and minimal secondary pollution, it is considered one of the optimal technologies for treating mercury-contaminated soil and solid waste.

[0004] Thermal desorption can be divided into direct contact and indirect contact. Direct heating thermal desorption involves the heat source directly contacting the contaminated soil, resulting in high heat transfer efficiency, but requires a large volume of flue gas to be treated. Indirect heating thermal desorption does not involve the heat source directly contacting the contaminated soil, resulting in a smaller volume of exhaust gas. Existing indirect thermal desorption devices have lower heat transfer efficiency, requiring longer desorption cylinders and larger footprints to ensure desorption effectiveness. Furthermore, existing indirect thermal desorption devices do not pre-dry contaminated soil with high moisture content during operation, leading to increased steam generation during thermal desorption and increased exhaust gas volume. Additionally, the intercrystalline water layer in the soil inhibits the thermal desorption of pollutants, reducing treatment efficiency, and the dried exhaust gas requires further treatment. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides an indirect thermal desorption treatment device for mercury-contaminated soil and solid waste.

[0006] The technical solution of the present invention is as follows: an indirect thermal desorption treatment device for mercury-contaminated soil and solid waste, comprising a device housing, a preheating component disposed at the upper end of the device housing, and a thermal desorption component disposed at the lower end of the device housing and connected to the preheating component; a first partition and a second partition are arranged sequentially from top to bottom inside the device housing; an exhaust pipe is provided on the outer wall of the device housing and is connected to both the preheating component and the thermal desorption component. The preheating assembly includes a preheating cylinder disposed on the upper surface of the first partition, a first rotating shaft rotatably engaged inside the preheating cylinder, a first auger sleeved outside the first rotating shaft, and a first auger motor disposed at the right end of the preheating cylinder with its output end connected to the first rotating shaft; a steam generator is disposed on the outer wall of the equipment housing and communicates with the inside of the preheating cylinder through a conduit; a feed hole is disposed on the upper end of the outer wall of the preheating cylinder and on the side near the first auger motor; The thermal desorption assembly includes a heating cylinder positioned above the second partition, an insulation cylinder sleeved outside the heating cylinder and fixedly connected to the second partition, a second rotating shaft rotatably engaged inside the heating cylinder, a second auger sleeved on the second rotating shaft, a second auger motor positioned at the left end of the heating cylinder with its output end connected to the second rotating shaft, and a combustion component positioned at the bottom of the equipment housing. A connecting pipe communicating with the interior of the preheating cylinder is provided on the upper end face of the heating cylinder and the side near the second auger motor. Several micro-holes are provided through the area on the outer wall of the heating cylinder located inside the insulation cylinder. A discharge hopper connected to the right end of the heating cylinder is provided through the outer wall of the equipment housing. The exhaust pipe is connected to both the preheating cylinder and the heating cylinder.

[0007] Furthermore, the combustion components include a fuel tank located at the bottom of the equipment housing and several burners equidistantly distributed on the upper surface of the fuel tank and sequentially penetrating the second partition and the insulation cylinder. An igniter is provided at the connection point between each burner and the fuel tank. Instructions: When in use, a mixture of natural gas and air is introduced into the fuel tank, and the combustible gas flowing through the burner is ignited by the igniter to form a combustion flame, which heats the heating cylinder.

[0008] Furthermore, there are two first rotating shafts and two first augers, and the two first augers are staggered; a gearbox is provided at the right end of the preheating cylinder, and small gears are provided at the ends of the two first rotating shafts, which are located inside the gearbox and mesh with each other. The first auger motor is located on the outer wall of the gearbox, and the output end of the first auger motor passes through the gearbox and is connected to a drive gear that meshes with one of the small gears. Explanation: By setting up two first rotating shafts and a first auger, the contaminated soil is continuously squeezed and broken between the two first augers rotating in opposite directions, which further refines the soil particles; at the same time, the staggered first augers can remove the soil adhering to the first rotating shaft.

[0009] Furthermore, an air inlet box is provided at the left end of the preheating cylinder, and the steam generator is connected to the air inlet box through a conduit. The first rotating shaft is hollow inside and is connected to the inside of the air inlet box. The first auger is hollow inside and is connected to the inside of the first rotating shaft. Several heat dissipation holes are provided through the outer wall of the first auger. Explanation: Hot steam enters the first auger through the first rotating shaft and then enters the contaminated soil through the heat dissipation holes on the first auger, which helps to improve the preheating efficiency of the contaminated soil.

[0010] Furthermore, a rotating cylinder is rotatably engaged with the heating cylinder and the area inside the insulation cylinder. A gear ring is sleeved on the outside of the rotating cylinder. An auxiliary shaft is rotatably engaged with the inside of the insulation cylinder. An auxiliary gear that meshes with the gear ring is sleeved on the auxiliary shaft. An auxiliary motor with its output end connected to the auxiliary shaft is provided on the outer wall of the insulation cylinder. Explanation: During the heating process, an auxiliary motor drives the auxiliary shaft and auxiliary gear to rotate synchronously. The meshing action of the auxiliary gear and gear ring causes the rotating cylinder to rotate on the heating cylinder, which helps to improve the heating uniformity of the soil inside the heating cylinder.

[0011] Furthermore, a transfer assembly is provided on the outer wall of the equipment housing, corresponding to the position of the discharge hopper; the transfer assembly includes a material box inclinedly arranged on the outer wall of the equipment housing, rotating wheels respectively rotatably engaged at both ends inside the material box, a conveyor belt sleeved on the outside of the two rotating wheels, and a conveyor motor arranged on the outer wall of the material box and providing rotational power to one of the rotating wheels. Explanation: After thermal desorption, the soil particles fall through the discharge hopper onto the upper surface of the conveyor belt. The conveyor motor drives the rotating wheel to rotate, thereby enabling the conveyor belt to transfer the thermally desorbed particles.

[0012] Furthermore, a pretreatment assembly connected to the feed port is provided at the top of the equipment housing; the pretreatment assembly includes a mixing cylinder at the top of the equipment housing, a crushing blade component inside the mixing cylinder, and a crushing motor at the top of the mixing cylinder that provides power to the crushing blade component; a conical hopper is connected to the bottom of the mixing cylinder, and a discharge pipe penetrating the equipment housing and connected to the feed port is connected to the bottom of the conical hopper; a filter grid is provided inside the mixing cylinder; a main feed pipe is provided on the outer wall of the mixing cylinder, and an auxiliary material input pipe is provided on the outer wall of the conical hopper; a stirring rod connected to the crushing blade component is provided inside the conical hopper; a discharge auger connected to the crushing blade component is rotatably engaged inside the discharge pipe; a baffle for closing the feed port is slidably engaged inside the outer wall of the preheating cylinder, and an electric push rod connected to the baffle is provided inside the equipment housing; Instructions: During use, contaminated soil is added into the mixing cylinder through the main feed pipe. The crushing motor drives the crushing blades to rotate forward, crushing the contaminated soil. The crushed soil particles pass through the filter grid and enter the conical hopper. Quicklime is added into the conical hopper through the auxiliary material input pipe, and the quicklime is mixed evenly with the contaminated soil particles by the stirring rod. Finally, the baffle is pulled by the electric push rod, and the crushing motor drives the crushing blades and the discharge screw to rotate in the opposite direction. The soil particles continuously enter the preheating cylinder under the action of the discharge screw. Furthermore, the crushing blade component includes a main crushing blade rotatably engaged inside the mixing cylinder and follower crushing blades rotatably engaged inside the mixing cylinder and located circumferentially to the main crushing blade; a first gear is provided at the top of the main crushing blade, and a second gear is provided at the top of each follower crushing blade to mesh with the first gear; a scraper plate is connected to the bottom of the main crushing blade to abut against the upper surface of the filter grid; the output end of the crushing motor is connected to the main crushing blade, and the stirring rod and the discharge screw are connected to the main crushing blade; Explanation: During the rotation of the main crusher, the meshing of the first and second gears enables each follower crusher to rotate in opposite directions around the main crusher, which is beneficial to improving the crushing effect of contaminated soil and creating favorable conditions for the thermal desorption treatment of contaminated soil; while the scraper can prevent soil particles from accumulating on the upper surface of the filter grid and causing filter grid blockage.

[0013] Furthermore, a door is hinged at the rear end of the equipment enclosure; Note: The installation of a door facilitates the maintenance and replacement of various components inside the equipment enclosure.

[0014] The working principle of this invention is as follows: In operation, mercury-contaminated soil is added to the mixing drum through the main feed pipe. The crushing motor drives the crushing blades to rotate forward, crushing the contaminated soil. The crushed soil particles pass through the filter grid and enter the conical hopper. Quicklime is added to the conical hopper through the auxiliary material input pipe, and the quicklime is mixed evenly with the contaminated soil particles by the stirring rod. Finally, the baffle is pulled by the electric push rod, and the crushing motor drives the crushing blades and the discharge screw to rotate in the opposite direction. The soil particles continuously enter the preheating cylinder under the action of the discharge screw. The hot steam generated by the steam generator is introduced into the air inlet box. The hot steam enters the first rotating part and diffuses into the contaminated soil through the heat dissipation holes on the first auger to preheat the contaminant. The first auger motor drives the first shaft and the first auger to rotate. The preheated contaminated soil enters the heating cylinder through the connecting pipe under the action of the first auger. A mixture of natural gas and air is introduced into the fuel tank and ignited by an igniter. The combustible gas flowing through the burner forms a combustion flame, which heats the heating cylinder. The heat from the heating cylinder is transferred to the contaminated soil inside, thus treating the contaminated soil. Gaseous mercury volatilized during the preheating and heating process is discharged through the exhaust pipe for further treatment. The second screw conveyor motor drives the second shaft and the second screw conveyor to rotate synchronously. The contaminated soil after thermal desorption treatment is discharged through the discharge hopper by the action of the second screw conveyor.

[0015] Compared with the prior art, the beneficial effects of the present invention are reflected in the following aspects: First, the present invention has a reasonable structural design and uses indirect heating to thermally desorb and remediate mercury-contaminated soil, resulting in a small amount of exhaust gas and reducing the energy consumption of the equipment, making it green and low-carbon. After the mercury-contaminated soil is remediated by the equipment, mercury can be recovered to the maximum extent, realizing the resource utilization of mercury-contaminated soil. Secondly, the integrated equipment structure of this invention facilitates installation and relocation, and has high ease of use; moreover, all components of this invention are integrated inside the equipment housing, which can effectively prevent secondary pollution caused by mercury vapor escape. Third, by sequentially conveying hot steam to the contaminated soil through the first rotating shaft and the first auger, the present invention can not only improve the utilization efficiency of hot steam, but also improve the preheating of the contaminated soil. At the same time, during the thermal desorption of the contaminated soil, the auxiliary motor drives the rotating drum to rotate, making the heating of the contaminated soil more uniform and promoting the thermal desorption effect of the contaminated soil. Attached Figure Description

[0016] Figure 1 This is a longitudinal sectional view of the present invention; Figure 2 This is the front view of the present invention; Figure 3 This is the right view of the present invention; Figure 4 This is a schematic diagram of the connection between the first auger motor and the first rotating shaft of the present invention; Figure 5 This is a schematic diagram of the connection between the first auger and the first rotating shaft of the present invention; Figure 6 This is a schematic diagram showing the connection between the heat preservation cylinder and the heating cylinder of the present invention; Figure 7 This is a schematic diagram of the pretreatment component of the present invention; Among them, 1-equipment housing, 10-first partition, 11-second partition, 12-door, 2-preheating component, 20-preheating cylinder, 200-feed hole, 201-gearbox, 202-air inlet box, 203-baffle, 21-first rotating shaft, 210-pinion gear, 22-first auger, 220-heat dissipation hole, 23-first auger motor, 230-drive gear, 24-steam generator, 25-electric push rod, 3-thermal desorption component, 30-heating cylinder, 300-connecting pipe, 301-rotating cylinder, 302-gear ring, 303-auxiliary shaft, 304-auxiliary gear, 31-insulation cylinder, 32-second rotating shaft, 33-second auger, 34-second Screw motor, 35-combustion component, 350-fuel tank, 351-burner, 352-igniter, 36-discharge hopper, 37-auxiliary motor, 4-exhaust pipe, 5-transfer assembly, 50-material bin, 51-rotating wheel, 52-conveyor belt, 53-conveyor motor, 6-pretreatment assembly, 60-mixing cylinder, 600-conical hopper, 601-drop pipe, 602-filter grid, 603-main feed pipe, 604-auxiliary material input pipe, 605-stirring rod, 61-crushing blade assembly, 610-main crushing blade, 611-follower crushing blade, 612-first gear, 613-second gear, 62-crushing motor, 63-discharge screw, 64-scraper plate. Detailed Implementation

[0017] Example 1 like Figure 1 , 2 The device shown is an indirect thermal desorption treatment device for mercury-contaminated soil and solid waste, including a device housing 1, a preheating component 2 disposed at the upper part of the device housing 1, and a thermal desorption component 3 disposed at the lower part of the device housing 1 and connected to the preheating component 2; a first partition 10 and a second partition 11 are arranged sequentially from top to bottom inside the device housing 1; an exhaust pipe 4 is provided on the outer wall of the device housing 1 and is connected to both the preheating component 2 and the thermal desorption component 3; and a door 12 is movably hinged to the rear end of the device housing 1. like Figure 1 , 2 As shown in Figure 4, the preheating assembly 2 includes a preheating cylinder 20 disposed on the upper end face of the first partition plate 10, a first rotating shaft 21 rotatably engaged inside the preheating cylinder 20, a first auger 22 sleeved outside the first rotating shaft 21, and a first auger motor 23 disposed at the right end of the preheating cylinder 20 with its output end connected to the first rotating shaft 21; a steam generator 24 is disposed on the outer wall of the equipment housing 1 and communicates with the interior of the preheating cylinder 20 through a conduit; a feed hole 200 is disposed on the upper end of the outer wall of the preheating cylinder 20 and on the side near the first auger motor 23; like Figure 1 , 6As shown, the thermal desorption assembly 3 includes a heating cylinder 30 disposed above the second partition 11, a heat preservation cylinder 31 sleeved outside the heating cylinder 30 and fixedly connected to the second partition 11, a second rotating shaft 32 rotatably engaged inside the heating cylinder 30, a second auger 33 sleeved on the second rotating shaft 32, a second auger motor 34 disposed at the left end of the heating cylinder 30 and whose output end is connected to the second rotating shaft 32, and a combustion component 35 (commercially available product) disposed at the bottom of the equipment housing 1; a connecting pipe 300 communicating with the interior of the preheating cylinder 20 is disposed on the upper end surface of the heating cylinder 30 and near the second auger motor 34; several micro-holes are provided through the area on the outer wall of the heating cylinder 30 located inside the heat preservation cylinder 31; a discharge hopper 36 connected to the right end of the heating cylinder 30 is provided through the outer wall of the equipment housing 1. like Figure 2 As shown, the exhaust pipe 4 is connected to both the preheating cylinder 20 and the heating cylinder 30.

[0018] Example 2 The difference between this embodiment and Embodiment 1 is that: like Figure 1 As shown. The combustion component 35 includes a fuel tank 350 located at the bottom of the equipment housing 1 and five burners 351 equidistantly distributed on the upper surface of the fuel tank 350 and passing through the second partition 11 and the insulation cylinder 31 in sequence. Each burner 351 is provided with an igniter 352 at the connection between it and the fuel tank 350. In use, a mixture of natural gas and air is introduced into the fuel tank 350, and the combustible gas flowing through the burner 351 is ignited by the igniter 352, thereby forming a combustion flame and heating the heating cylinder 30.

[0019] Example 3 The difference between this embodiment and Embodiment 2 is that: like Figure 4 As shown, there are two first rotating shafts 21 and two first augers 22, and the two first augers 22 are staggered. A gearbox 201 is provided at the right end of the preheating cylinder 20. The ends of the two first rotating shafts 21 are provided with small gears 210 located inside the gearbox 201 and meshing with each other. The first auger motor 23 is provided on the outer wall of the gearbox 201. The output end of the first auger motor 23 passes through the gearbox 201 and is connected to a drive gear 230 that meshes with one of the small gears 210. By setting two first rotating shafts 21 and two first augers 22, the contaminated soil is continuously squeezed and broken between the two first augers 22 rotating in opposite directions, so that the soil particles are further refined. At the same time, the staggered first augers 22 can remove the soil adhering to the first rotating shaft 21.

[0020] Example 4 The difference between this embodiment and embodiment 3 is that: like Figure 4 , 5 As shown, an air inlet box 202 is provided at the left end of the preheating cylinder 20. The steam generator 24 is connected to the air inlet box 202 through a conduit. The first rotating shaft 21 is hollow inside and is connected to the inside of the air inlet box 202. The first auger 22 is hollow inside and is connected to the inside of the first rotating shaft 21. Several heat dissipation holes 220 are provided through the outer wall of the first auger 22. Hot steam enters the interior of the first auger 22 through the first rotating shaft 21 and enters the contaminated soil through the heat dissipation holes 220 on the first auger 22, which helps to improve the preheating efficiency of the contaminated soil.

[0021] Example 5 The difference between this embodiment and embodiment 4 is that: like Figure 6 As shown, a rotating cylinder 301 is rotatably engaged with the heating cylinder 30 and the area inside the insulation cylinder 31. A gear ring 302 is sleeved on the outside of the rotating cylinder 301. An auxiliary shaft 303 is rotatably engaged with the inside of the insulation cylinder 31. An auxiliary gear 304 is sleeved on the auxiliary shaft 303 and meshes with the gear ring 302. An auxiliary motor 37 with its output end connected to the auxiliary shaft 303 is provided on the outer wall of the insulation cylinder 31. During the heating process of the heating cylinder 30, the auxiliary motor 37 drives the auxiliary shaft 303 and the auxiliary gear 304 to rotate synchronously. The meshing action of the auxiliary gear 304 and the gear ring 302 causes the rotating cylinder 301 to rotate on the heating cylinder 30, which helps to improve the heating uniformity of the soil inside the heating cylinder 30.

[0022] Example 6 The difference between this embodiment and embodiment 5 is that: like Figure 1 , 3 As shown, a transfer assembly 5 is provided on the outer wall of the equipment housing 1, corresponding to the position of the discharge hopper 36. The transfer assembly 5 includes a material box 50 inclinedly arranged on the outer wall of the equipment housing 1, rotating wheels 51 respectively rotatably engaged at both ends inside the material box 50, a conveyor belt 52 sleeved on the outside of the two rotating wheels 51, and a conveyor motor 53 arranged on the outer wall of the material box 50 and providing rotational power for one of the rotating wheels 51. The soil particles after thermal desorption treatment fall through the discharge hopper 36 to the upper surface of the conveyor belt 52. The conveyor motor 53 drives the rotating wheel 51 to rotate, so that the conveyor belt 52 can transfer the thermally desorbed particles.

[0023] Example 7 The difference between this embodiment and embodiment 6 is that: like Figure 2 , 7As shown, a pretreatment component 6 connected to the feed hole 200 is provided at the top of the equipment housing 1; the pretreatment component 6 includes a mixing cylinder 60 provided at the top of the equipment housing 1, a crushing blade component 61 provided inside the mixing cylinder 60, and a crushing motor 62 provided at the top of the mixing cylinder 60 and providing power to the crushing blade component 61; a conical hopper 600 is connected to the bottom of the mixing cylinder 60, and a discharge pipe 601 penetrating the equipment housing 1 and connected to the feed hole 200 is connected to the bottom of the conical hopper 600; a filter grid 602 is provided inside the mixing cylinder 60; and a filter screen 602 is provided on the outer wall of the mixing cylinder 60. The main feed pipe 603 and the outer wall of the conical hopper 600 are provided with an auxiliary material input pipe 604; the conical hopper 600 is provided with a stirring rod 605 connected to the crushing blade component 61; the discharge pipe 601 is rotatably engaged with a discharge screw 63 connected to the crushing blade component 61; the outer wall of the preheating cylinder 20 is slidably engaged with a baffle 203 for closing the feed hole 200; the equipment housing 1 is provided with an electric push rod 25 connected to the baffle 203; the crushing blade component 61 includes a main crushing blade 610 rotatably engaged with the mixing cylinder 60 and a main crushing blade 610 rotatably engaged with the mixing cylinder 60. Inside the main crusher 610, there are follower crushers 611 located circumferentially around the main crusher 610; a first gear 612 is provided at the top of the main crusher 610, and a second gear 613 is provided at the top of each follower crusher 611 to mesh with the first gear 612; a scraper 64 is connected to the bottom of the main crusher 610 and abuts against the upper surface of the filter grid 602; the output end of the crushing motor 62 is connected to the main crusher 610, and the stirring rod 605 and the discharge screw 63 are connected to the main crusher 610; contaminated soil is added into the mixing cylinder 60 through the main feed pipe 603, and the crushing motor... The machine 62 drives the crushing blade component 61 to rotate in the forward direction, and uses the crushing blade component 61 to crush the contaminated soil. The crushed soil particles enter the conical hopper 600 through the filter grid 602. Quicklime is added into the conical hopper 600 through the auxiliary material input pipe 604, and the quicklime and contaminated soil particles are mixed evenly by the stirring rod. Finally, the baffle 203 is pulled by the electric push rod 25, and the crushing motor 62 drives the crushing blade component 61 and the discharge screw 63 to rotate in the reverse direction. The soil particles continuously enter the preheating cylinder 20 under the action of the discharge screw 63.

[0024] It should be noted that the first auger motor 23, steam generator 24, second auger motor 34, igniter 352, auxiliary motor 37, conveyor motor 53 and crushing motor 62 used in this invention all adopt existing technologies and are not specifically limited here. Those skilled in the art can select the corresponding products according to actual needs.

Claims

1. An apparatus for treating mercury-containing contaminated soil and solid waste by indirect thermal desorption, characterized in that, The device box (1), the preheating assembly (2) arranged on the upper end inside the device box (1), and the thermal desorption assembly (3) arranged on the lower end inside the device box (1) and connected with the preheating assembly (2); the first partition plate (10) and the second partition plate (11) are sequentially arranged from top to bottom inside the device box (1); the exhaust pipe (4) connected with the preheating assembly (2) and the thermal desorption assembly (3) is arranged on the outer wall of the device box (1); The preheating assembly (2) comprises the preheating cylinder (20) arranged on the upper end surface of the first partition plate (10), the first rotating shaft (21) rotatably connected inside the preheating cylinder (20), the first auger (22) sleeved outside the first rotating shaft (21), and the first auger motor (23) arranged on the right end of the preheating cylinder (20) and connected with the output end of the first rotating shaft (21); the steam generator (24) in communication with the inside of the preheating cylinder (20) through a conduit is arranged on the outer wall of the device box (1); the feeding hole (200) is arranged on the outer wall of the preheating cylinder (20) and close to one side of the first auger motor (23); The thermal desorption assembly (3) comprises the heating cylinder (30) arranged above the second partition plate (11), the heat preservation cylinder (31) sleeved outside the heating cylinder (30) and fixedly connected with the second partition plate (11), the second rotating shaft (32) rotatably connected inside the heating cylinder (30), the second auger (33) sleeved on the second rotating shaft (32), the second auger motor (34) arranged on the left end of the heating cylinder (30) and connected with the output end of the second rotating shaft (32), and the combustion member (35) arranged on the bottom of the device box (1); the communication pipe (300) in communication with the inside of the preheating cylinder (20) is arranged on the upper end surface of the heating cylinder (30) and close to one side of the second auger motor (34), and a plurality of micropores are arranged through the region of the outer wall of the heating cylinder (30) and located inside the heat preservation cylinder (31); the discharge hopper (36) connected with the right end of the heating cylinder (30) is arranged through the outer wall of the device box (1); The exhaust pipe (4) is connected with the preheating cylinder (20) and the heating cylinder (30).

2. The apparatus for treating soil and solid waste contaminated with mercury by indirect thermal desorption according to claim 1, characterized in that, The combustion member (35) comprises the fuel tank (350) arranged on the bottom of the device box (1) and a plurality of burners (351) equidistantly arranged on the upper end surface of the fuel tank (350) and sequentially penetrating the second partition plate (11) and the heat preservation cylinder (31); the igniter (352) is arranged at the connection between each burner (351) and the fuel tank (350).

3. The apparatus for treating soil and solid waste contaminated with mercury by indirect thermal desorption according to claim 1, characterized in that, The first rotating shaft (21) and the first auger (22) are provided with two, and the two second augers (22) are staggered; the right end of the preheating cylinder (20) is provided with a gear box (201), the ends of the two first rotating shafts (21) are provided with pinions (210) located in the gear box (201) and connected with each other, the first auger motor (23) is arranged on the outer side wall of the gear box (201), the output end of the first auger motor (23) penetrates the gear box (201), and the output end is connected with a driving gear (230) engaged with one of the pinions (210).

4. The apparatus for treating soil and solid waste contaminated with mercury by indirect thermal desorption according to claim 3, characterized in that, The left end of the preheating cylinder (20) is provided with an air inlet box (202), the steam generator (24) is connected with the air inlet box (202) through a pipeline, the first rotating shaft (21) is hollow, and the first rotating shaft (21) is in communication with the inside of the air inlet box (202); the first auger (22) is hollow, the first auger (22) is in communication with the inside of the first rotating shaft (21), and a plurality of heat dissipation holes (220) are arranged on the outer side wall of the first auger (22).

5. The apparatus for processing soil and solid waste containing mercury according to claim 1, wherein The area of the heating cylinder (30) and the inside of the heat preservation cylinder (31) is rotationally connected with a rotating cylinder (301), the rotating cylinder (301) is externally sleeved with a gear ring (302), the heat preservation cylinder (31) is rotationally connected with an auxiliary shaft (303) in the inside, the auxiliary shaft (303) is sleeved with an auxiliary gear (304) engaged with the gear ring (302); the outer side wall of the heat preservation cylinder (31) is provided with an auxiliary motor (37) with an output end connected with the auxiliary shaft (303).

6. The apparatus for processing soil and solid waste containing mercury according to claim 1, wherein The outer side wall of the equipment box (1) and the position corresponding to the discharge hopper (36) is provided with a transfer assembly (5); the transfer assembly (5) comprises a material box (50) obliquely arranged on the outer side wall of the equipment box (1), rotating wheels (51) rotationally connected at both ends in the inside of the material box (50), a conveying belt (52) sleeved outside the two rotating wheels (51), and a conveying motor (53) arranged on the outer side wall of the material box (50) and providing rotating power for one of the rotating wheels (51).

7. The apparatus for processing soil and solid waste containing mercury according to claim 1, wherein The device box (1) top is provided with the pretreatment assembly (6) connected with the feeding hole (200); the pretreatment assembly (6) includes the mixing barrel (60) arranged at the top of the device box (1), the crushing cutter member (61) arranged in the mixing barrel (60) and the crushing motor (62) arranged at the top of the mixing barrel (60) and providing power for the crushing cutter member (61); the bottom end of the mixing barrel (60) is connected with the conical hopper (600), the bottom end of the conical hopper (600) is connected with the blanking pipe (601) penetrating through the device box (1) and connected with the feeding hole (200); the inside of the mixing barrel (60) is provided with a filter grid (602); the outer side wall of the mixing barrel (60) is provided with a main feeding pipe (603), the outer side wall of the conical hopper (600) is provided with an auxiliary material input pipe (604), and the inside of the conical hopper (600) is provided with a stirring rod (605) connected with the crushing cutter member (61); the inside of the blanking pipe (601) is rotatably connected with the discharging screw (63) connected with the crushing cutter member (61); the inside of the outer side wall of the preheating cylinder (20) is slidably connected with the baffle (203) for closing the feeding hole (200), and the inside of the device box (1) is provided with the electric push rod (25) connected with the baffle (203).

8. The apparatus for treating soil and solid waste contaminated with mercury by indirect thermal desorption according to claim 7, characterized in that, The crushing cutter member (61) includes the main crushing cutter (610) rotatably connected in the mixing barrel (60) and the follow-up crushing cutter (611) rotatably connected in the mixing barrel (60) and located in the circumferential direction of the main crushing cutter (610); the top end of the main crushing cutter (610) is provided with the first gear (612), and the top end of each follow-up crushing cutter (611) is provided with the second gear (613) meshingly connected with the first gear (612); the bottom end of the main crushing cutter (610) is connected with the scraping plate (64) abutting against the upper end surface of the filter grid (602); the output end of the crushing motor (62) is connected with the main crushing cutter (610), and the discharging screw (63) is connected with the main crushing cutter (610).

9. The apparatus for treating soil and solid waste contaminated with mercury by indirect thermal desorption according to claim 1, characterized in that, The rear end of the device box (1) is movably hinged with the box door (12).

10. The apparatus for processing soil and solid waste containing mercury according to claim 1, wherein The top end of the device box (1) is provided with the pretreatment assembly (6).

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