High-arsenic slag pyrolysis recovery device

Abstract

The invention relates to the technical field of recovery equipment, and provides a high-arsenic slag pyrolysis recovery device which comprises a steel belt type drying furnace and a steel belt type pyrolysis reduction furnace, and the steel belt type drying furnace and the steel belt type pyrolysis reduction furnace each comprise a furnace body, a furnace pipe penetrating through a hearth in the furnace body and a steel belt penetrating through the furnace pipe and rotating circularly. A combustion nozzle used for heating the furnace tube in a radiation mode is arranged in the furnace body. A furnace tube of the steel belt type drying furnace is respectively connected with a feeding device, a first cooling device, a first discharging device and a waste gas exhausting device; and a furnace tube of the steel belt type pyrolysis reduction furnace is respectively connected with the feeding device, the second cooling device, the second discharging device and the metal arsenic collecting device. The continuous drying and pyrolysis reduction reaction of the high-arsenic slag is realized by adopting the circularly rotating steel belt, the working steps of automatic feeding, spreading, deslagging and arsenic collection of the high-arsenic slag are realized, and the working efficiency of equipment operation is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of recovery equipment, and in particular to a high-arsenic slag pyrolysis recovery device. Background Art

[0002] A large amount of arsenic-containing wastewater is generated during chemical and metallurgical production. The treatment of arsenic-containing wastewater usually uses the sulfide precipitation method to remove arsenic from the wastewater, producing arsenic sulfide slag. At present, the comprehensive treatment methods of arsenic sulfide slag are roughly divided into two directions:

[0003] 1. Solidification, storage and landfill: This method mainly involves mixing arsenic sulfide slag with solidification agents, flocculants, solid powder adsorbents and water in a certain proportion, stirring evenly, and curing under natural conditions before storage or landfill. This method is simple in process and low in cost, and has been applied to a certain extent. However, arsenic itself is also a resource widely used in various industries. Direct solidification and landfilling will not effectively utilize arsenic resources, resulting in waste of resources and loss of its economic value.

[0004] 2. Comprehensive resource utilization: converting the arsenic in the arsenic sulfide slag into valuable substances such as elemental arsenic, arsenic trioxide or pure arsenic sulfide for recycling, thereby creating significant economic, social and environmental benefits.

[0005] Chinese patent CN112626346A discloses a method for recovering metallic arsenic by reducing arsenic sulfide slag with hydrogen, which comprises: A. Drying: the arsenic sulfide slag produced by the wastewater treatment system is heated and dried to control the water content to ≤0.2%; B. Volatilization: the dried arsenic sulfide slag is added to a volatilizer and heated to 710°C to 780°C, and the arsenic sulfide is sublimated and then enters a reactor; C. Reduction: the reactor is heated to control the temperature at 750°C to 900°C, and hydrogen is introduced to mix with arsenic sulfide vapor for reduction reaction. D. Purification: The metallic arsenic vapor, hydrogen sulfide and residual arsenic sulfide vapor produced by the reduction reaction enter the purifier, and the temperature is controlled at 630℃~680℃ to make the residual arsenic sulfide vapor condense, settle and separate; E. Arsenic collection: The metallic arsenic vapor and hydrogen sulfide gas enter the arsenic settler. The metallic arsenic vapor solidifies after cooling. Part of it settles to the bottom of the arsenic settler, and part of it adheres to the inner wall of the arsenic settler. At regular intervals, the outer wall of the arsenic settling barrel is knocked with a rubber hammer to open the overflow spiral at the lower end of the arsenic settler to collect the metallic arsenic.

[0006] The above patent can recover metallic arsenic with high purity, but the process is discontinuous, the work efficiency is low, and the arsenic recovery step requires manual operation, which is labor-intensive. Summary of the invention

[0007] The purpose of the present invention is to solve the shortcomings of the existing high-arsenic slag decomposition process, which is discontinuous and has low working efficiency, and to propose a high-arsenic slag pyrolysis recovery device.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A high-arsenic slag pyrolysis recovery device comprises a steel belt drying furnace and a steel belt pyrolysis reduction furnace.

[0010] The steel belt drying furnace comprises a plurality of furnace bodies arranged on a first furnace bottom frame in sequence, a furnace pipe 1 passing through the furnace chamber of each furnace body in sequence, and a first steel belt passing through the furnace pipe 1 and driven by a first active roller and a first passive roller to circulate and rotate; a plurality of combustion nozzles for radiantly heating the furnace pipe are arranged in each furnace body; the furnace pipe 1 comprises a feeding section furnace pipe, a heating section furnace pipe 1, a cooling section furnace pipe 1 and a discharging section furnace pipe 1 which are connected in sequence, the feeding section furnace pipe extends from the front end of the furnace body to connect to the feeding device, the cooling section furnace pipe 1 extends from the rear end of the furnace body to connect to the first cooling device, and the discharging section furnace pipe 1 extends from the first cooling device to connect to the first discharging device; the heating section furnace pipe 1 located in the furnace body is connected to the exhaust gas exhaust device;

[0011] The steel belt type pyrolytic reduction furnace comprises a plurality of furnace bodies arranged on a second furnace bottom frame in sequence, a furnace tube 2 passing through the furnace chamber of each furnace body in sequence, and a second steel belt passing through the furnace tube 2 and driven by a second active roller and a second passive roller to circulate and rotate; a plurality of combustion nozzles for radiantly heating the furnace tube 2 are arranged in each furnace body; the furnace tube 2 comprises a feed section furnace tube, a heating section furnace tube 2, a cooling section furnace tube 2 and a discharge section furnace tube 2 which are connected in sequence, the feed section furnace tube extends from the front end of the furnace body to connect to the feed device, the cooling section furnace tube 2 extends from the rear end of the furnace body to connect to the second cooling device, and the discharge section furnace tube 2 extends from the second cooling device to connect to the second discharge device; the heating section furnace tube 2 located in the furnace body is connected to a metal arsenic collecting device;

[0012] The high-arsenic slag raw material is evenly distributed on the first steel belt of the feed section furnace tube through the feeding device, and enters the furnace hall of the furnace body as the first steel belt rotates. In the furnace hall, the first steel belt and the high-arsenic slag raw material on the first steel belt are heated by the combustion nozzle and the temperature rises, and the moisture in the high-arsenic slag raw material begins to evaporate. The evaporated water vapor and organic waste gas are sucked into the exhaust gas exhaust device for leaching and purification. The high-arsenic slag raw material with dried moisture is cooled by the first cooling device and then enters the first discharging device. It is crushed into small particles in the first discharging device and then enters the feeding device; the dried high-arsenic slag raw material The powdered high-arsenic slag raw material and the catalyst are evenly mixed through the feeding device and then evenly distributed on the second steel belt of the feeding section furnace tube. As the second steel belt rotates, it enters the furnace hall of the furnace body. The reducing gas is introduced into the furnace hall from the rear end of the heating section furnace tube (II). In the furnace hall, the high-arsenic slag raw material and the reducing gas undergo a reduction reaction to generate arsenic vapor. The arsenic vapor enters the metal arsenic collecting device and is cooled into solid particles. The waste slag generated by the reduction reaction is cooled by the second cooling device and then enters the second discharging device. It is crushed into small particles in the second discharging device and then output.

[0013] Preferably, the feeding device includes a belt conveyor and a distributor, the belt conveyor is arranged in a shell, a feed hopper is arranged at the front end of the shell, and the feed hopper is used to spread the arsenic slag on the conveyor belt of the belt conveyor; a discharge hopper is arranged at the rear end of the shell, and the bottom of the discharge hopper is inserted into furnace tube one, so as to fully spread the arsenic slag dropped from the belt onto the steel belt in furnace tube one along the width direction; the distributor includes a distributor shell which is installed on the upper opening of furnace tube one and the bottom is open, and a pneumatic seasoning flap, a pneumatic shear knife and a powder thickness adjustment scraper are arranged in the distributor shell in sequence, the pneumatic seasoning flap is driven to rotate by a cylinder to adjust the distance between the flap and the steel belt, thereby adjusting the thickness of the slag layer laid on the steel belt by the belt conveyor, the pneumatic shear knife is driven by the cylinder to move up and down to loosen the slag layer, and the powder thickness adjustment scraper is used to adjust the distance between the scraper and the steel belt, thereby adjusting the thickness of the slag layer on the steel belt entering the furnace body.

[0014] Preferably, the exhaust gas device includes an exhaust gas branch pipe arranged in the furnace body and passing through the furnace and connected to the heating section furnace tube, an exhaust gas main pipe connecting all the exhaust gas branch pipes, a spray tank connected to the exhaust gas main pipe, and an exhaust gas fan connected to the spray tank.

[0015] Preferably, the first discharging device includes a receiving bin for receiving the arsenic slag falling from the first steel belt coming out of the furnace tube 2 at the discharging end, a pair of relatively rotating crushing rollers arranged at the bottom outlet of the receiving bin for crushing the arsenic slag powder falling from the outlet of the receiving bin into small particles, and a hood-type powder receiving bin for accommodating the receiving bin and the crushing roller.

[0016] Preferably, the second discharging device includes a slag receiving bin for receiving the slag falling from the second steel belt coming out of the second furnace pipe at the discharging end, a pair of relatively rotating slag crushing rollers arranged at the bottom outlet of the slag receiving bin for crushing the slag powder falling from the outlet of the slag receiving bin into small particles, a hood-type powder receiving machine for accommodating the slag receiving bin and the slag crushing rollers, and a slag conveyor arranged at the bottom of the hood-type powder receiving machine.

[0017] Preferably, the feeding device includes a feeding bin, a screw feeder arranged at the bottom outlet of the feeding bin, a feeding pipe whose upper end is connected to the screw feeder and whose lower end is inserted into furnace tube 2, a spreader connected to the feeding pipe, a mixing crusher connected to the feeding bin through the feeding pipe, and a high-arsenic slag bin and a catalyst bin respectively connected to the two feeding ports of the mixing crusher.

[0018] Preferably, the metallic arsenic collection device comprises a closed box with a double-conical bottom, a pair of relatively rotating water-cooled collection rollers arranged in the closed box, and two scrapers respectively arranged on the outsides of the two water-cooled collection rollers and used to scrape the metallic arsenic solidified on the surfaces of the water-cooled collection rollers to the bottom of the closed box, and both conical bottoms are provided with arsenic block collection and cleaning ports.

[0019] Preferably, the first cooling device and the second cooling device have the same structure, both comprising cooling jacket 1 and cooling jacket 2 sleeved on the outer circumference of the furnace tube, water inlet pipe 1 and water inlet pipe 2 for introducing cooling water into cooling jacket 1 or cooling jacket 2, and water outlet pipe 1 and water outlet pipe 2 for discharging hot water in cooling jacket 1 and cooling jacket 2.

[0020] Preferably, the bottoms of the feeding section furnace tube, cooling section furnace tube 1, cooling section furnace tube 2, discharge end furnace tube 1 and discharge end furnace tube 2 are all provided with a first roller or a second roller, and the first roller is slidably connected to a first slide rail laid on the first furnace bottom frame; the bottoms of the feeding section furnace tube, cooling section furnace tube 1 and discharge end furnace tube 1 are all provided with a first roller or a second roller, and the second roller is slidably connected to a second slide rail laid on the second furnace bottom frame.

[0021] Preferably, the passive rollers of the steel belt drying furnace and the steel belt pyrolysis reduction furnace are both provided with a steel belt tensioning device, which includes a base frame, a tensioning pulley, a roller trolley, a traction rope and a counterweight. The base frame is provided with a guide rail, and the passive roller is rotatably mounted on the roller trolley. A roller is installed at the bottom of the roller trolley, and the roller rolls on the guide rail. One end of the traction rope is fixedly connected to the counterweight, and the other end passes around the tensioning pulley and is fixedly connected to the roller trolley.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The circulating steel belt furnace is used to achieve continuous drying and pyrolysis reduction reaction of high-arsenic slag, fully automatic feeding, material laying, slag discharge and arsenic collection, with high production efficiency, safety and environmental protection.

[0024] 2. The raw materials are dried and reduced by indirect heating of the furnace tubes. The gas produced by the reaction does not come into direct contact with the furnace body, ensuring the safety of the furnace body and operators. The temperature of each furnace body can be freely adjusted under the condition of ensuring normal production, with high thermal efficiency.

[0025] 3. Use a belt conveyor to spread the arsenic slag on the steel belt, and then use a distributor to loosen the slag layer and control the thickness, so that the internal moisture of the arsenic slag entering the furnace body can be easily volatilized and fully dried.

[0026] 4. A receiving bin is used to realize the sealed discharge of the dried arsenic slag, and a pair of crushing rollers are used to crush the compacted arsenic slag after drying, which is beneficial to the next reduction reaction of the arsenic slag.

[0027] 5. A feeding device is used to achieve the mixing of reaction raw materials and catalysts and the uniform distribution of the mixed raw materials on the steel belt to ensure the full progress of the reaction.

[0028] 6. The reaction efficiency can be improved by using the method of countercurrent reaction between dried arsenic slag and reducing gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a high-arsenic slag pyrolysis recovery device of the present invention.

[0030] Figure 2 It is a side view of the furnace body portion of the steel belt drying furnace of the present invention.

[0031] Figure 3 It is a structural schematic diagram of a feeding device of a steel belt drying furnace of the present invention.

[0032] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle.

[0033] Figure 5 It is a structural schematic diagram of a discharging device, an active roller and a cooling device of a steel belt drying furnace of the present invention.

[0034] Figure 6 It is a structural schematic diagram of a steel belt tensioning device of a steel belt drying furnace of the present invention.

[0035] Figure 7 It is a structural schematic diagram of a feeding device of a steel belt type pyrolysis reduction furnace of the present invention.

[0036] Figure 8 It is a structural schematic diagram of a discharging device, a cooling device and an active roller of a steel belt type pyrolysis reduction furnace of the present invention.

[0037] Fig. 9 It is a structural schematic diagram of a metal arsenic collecting device of a steel belt type pyrolysis reduction furnace of the present invention.

[0038] In the figure: 110, first furnace bottom frame; 111, first slide rail; 112, first roller; 113, first guide roller; 121, first furnace body; 122, second furnace body; 123, third furnace body; 130, furnace tube 1; 131, furnace tube in feeding section; 1311, end cover; 1312, soft curtain; 1313, supporting steel plate; 1314, elastic pressure roller; 132, furnace tube 1 in heating section; 133, furnace tube 1 in cooling section; 134, furnace tube 1 in discharging section; 140, charging device; 141, belt conveyor; 1411, shell; 1412, feed hopper; 1413, conveyor belt; 1414, discharging hopper; 142, distributor; 1421, distributor shell; 1422, pneumatic seasoning flap; 1423, pneumatic shear knife; 1424, powder thickness adjustment scraper; 150, first cooling device; 151, cooling jacket one; 152, water inlet pipe one; 153, water outlet pipe one; 160, first discharging device; 161, receiving bin one; 162, crushing roller one; 163, wire roller brush one; 1631, discharging port; 164, scraper one; 165, bag dust collector one; 171, first active roller; 1711, first belt; 1712, first motor; 1713, first supporting wheel; 172, first passive roller; 173, first steel belt; 174, steel belt tensioning device; 1741, bottom frame; 1742, tensioning pulley; 1743, roller trolley; 1744, traction rope; 1745, counterweight; 180, exhaust device; 1 81. Exhaust gas main pipe; 182. Spray tank; 183. Exhaust gas fan; 184. Exhaust chimney; 191. First sealing device; 1911. Sealing shell; 1912. Heat-insulating sealing curtain; 192. Bellows expansion joint; 193. Second sealing device; 210. Second furnace bottom frame; 211. Second slide rail; 212. Second roller; 213. Second guide roller; 221. Furnace body 1; 222. Furnace body 2; 230. Furnace pipe 2; 231. Furnace pipe in feeding section; 2311. Furnace head sealing felt roller; 2312. Nitrogen blowing sealing pipe; 232. Furnace pipe 2 in heating section; 233. Furnace pipe 2 in cooling section; 234. Furnace pipe 2 in discharging section; 240. Feeding device; 241. Sealing cover; 242. Spreader; 243. Feed pipe 1; 244, spiral feeder; 245, feed bin; 246, feed pipe 2; 247, mixing mill; 248, catalyst bin; 249, high arsenic slag bin; 250, second cooling device; 251, cooling jacket 2; 252, water inlet pipe 2; 253, water outlet pipe 2; 260, second discharging device; 261, receiving bin 2; 262, crushing roller 2; 263, cover; 264, scraper 2; 265, bag dust collector 2; 266, screw conveyor; 267, wire roller brush 2; 271, second active roller; 2711, second belt; 2712, second motor; 2713, second support wheel; 272, second passive roller; 273, second steel belt; 280, metal arsenic collecting device;2801, closed box; 281, exhaust pipe; 282, water cooling collection roller; 283, scraper three; 284, cleaning port; 285, air intake short pipe; 286, radial roller; 287, rail steel; 288, trolley; 289, clamping cylinder; 291, third sealing device; 292, displacement compensator; 293, fourth sealing device. ; DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Embodiment 1

[0041] Reference Figure 1-Figure 9 , a high-arsenic slag pyrolysis recovery device. In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described in conjunction with the accompanying drawings and a preferred implementation method.

[0042] See also Figure 1 , a high-arsenic slag pyrolysis recovery device, comprising: a steel belt drying furnace and a steel belt pyrolysis reduction furnace,

[0043] The steel belt drying furnace comprises three furnace bodies, namely, a first furnace body 121, a second furnace body 122 and a third furnace body 123, which are sequentially arranged on a first furnace bottom frame 110, a furnace tube 130 which sequentially passes through the furnace chambers of the first furnace body 121, the second furnace body 122 and the third furnace body 123, and a first steel belt 173 which passes through the furnace tube 130 and is driven to rotate cyclically by a first active roller 171 and a first passive roller 172; each furnace body is provided with a plurality of combustion nozzles for radiantly heating the furnace tube 130; the furnace tube 130 comprises a plurality of The connected feeding section furnace pipe 131, heating section furnace pipe 132, cooling section furnace pipe 133 and discharging section furnace pipe 134, the feeding section furnace pipe 131 extends from the front end of the first furnace body 121 to connect the feeding device (belt conveyor 141 and distributor 142), the cooling section furnace pipe 133 extends from the rear end of the third furnace body 123 to connect the first cooling device 150, and the discharging section furnace pipe 134 extends from the first cooling device 150 to connect the first discharging device 160; the heating section furnace pipe located in the furnace body is connected to the exhaust gas exhaust device 180;

[0044] The steel belt type pyrolysis reduction furnace comprises two furnace bodies, furnace body 1 221 and furnace body 222, which are sequentially arranged on a second furnace bottom frame 210; furnace pipes which sequentially pass through the furnace chambers of furnace body 1 221 and furnace body 222; and a second steel belt 273 which passes through the furnace pipe and is driven by a second active roller 271 and a second passive roller 272 to circulate and rotate; a plurality of combustion nozzles for radiantly heating the furnace pipe are arranged in furnace body 1 221 and furnace body 222; the furnace pipe comprises a feeding section furnace connected sequentially; Tube 231, heating section furnace tube 232, cooling section furnace tube 233 and discharging section furnace tube 234, the feeding section furnace tube 231 extends from the front end of the furnace body 221 to connect with the feeding device 240, the cooling section furnace tube 233 extends from the rear end of the furnace body 222 to connect with the second cooling device 250, and the discharging section furnace tube 234 extends from the second cooling device 250 to connect with the second discharging device 260; the heating section furnace tube 232 located in the furnace body is connected with the metal arsenic collecting device 280.

[0045] In specific implementation, the main body structures of the steel belt drying furnace and the steel belt pyrolysis reduction furnace are the same, that is, the furnace base frame, furnace body, furnace tube and steel belt all adopt the same structural design.

[0046] The first furnace bottom frame 110 and the second furnace bottom frame 210 are both made of welded steel. In order to facilitate transportation and installation, the furnace bottom can be made into several sections, which are used to support the furnace body and the furnace pipe respectively. The upper part of the furnace bottom frame is used to install the furnace body, and the lower part of the furnace bottom frame is provided with guide rollers, such as the first guide roller 113 installed on the first furnace bottom frame 110 and the second guide roller 213 installed on the second furnace bottom frame 210. The first guide roller 113 is used to roll and support the first steel belt 173 to rotate, and the second guide roller 213 is used to roll and support the second steel belt 273 to rotate.

[0047] The first active roller 171 and the second active roller 271 are both rotatably mounted on the active roller bracket through the bearing seat, and the active roller bracket is fixedly mounted at the rear end of the furnace bottom frame. Figure 5 The first active roller 171 is connected to the first motor 1712 through the first belt 1711, and the first motor 1712 drives the first steel belt 173 to rotate; in order to reduce the load of the bearing seat, the bottom of the first active roller 171 is also rollingly supported by the first supporting wheel 1713.

[0048] The first passive roller 172 and the second passive roller 272 are both rotatably arranged at the front end of the furnace bottom frame through the steel belt tensioning device 174. Figure 6The steel belt tensioning device 174 is composed of a base frame 1741, a tensioning pulley 1742, a roller trolley 1743, a traction rope 1744 and a counterweight 1745. The base frame 1741 is welded from channel steel, and a guide rail is installed on the base frame 1741. The first passive roller 172 is rotatably mounted on the roller trolley 1743, and a roller is installed at the bottom of the roller trolley 1743, and the roller rolls on the guide rail. One end of the traction rope 1744 is fixedly connected to the counterweight 1745, and the other end passes around the tensioning pulley 1742 and is fixedly connected to the roller trolley 1743. The first steel belt 173 bypasses the first passive roller 172, passes through the furnace tube, bypasses the first active roller 171, passes through the first guide roller 113 and returns to the first passive roller 172, and is driven by the first active roller 171 to rotate in a cycle; when the first steel belt 173 is extended, the counterweight block 1745 pulls the traction rope 1744 downward, and the traction rope 1744 pulls the roller trolley 1743 and the first passive roller 172 forward, so that the first steel belt 173 is finally in a tensioned state.

[0049] The furnace body and furnace body are mainly welded by Q235 steel and steel plates, and are lined with reinforcing ribs. The shell 1411 consists of two layers, the inner shell 1411 is used to fix heating elements, insulation cotton, etc.; the outer shell 1411 is used to install the protective cover. The furnace lining adopts an insulation structure with an insulation layer ≥250mm. The three side walls are aluminum silicate fiber modules. The inner side of the furnace bottom adopts ultra-light energy-saving bricks, and the furnace pipe support is high-aluminum or heavy special-shaped support pier bricks. The insulation structure has good thermal insulation effect, low energy storage and small heat loss. The furnace body is a sealed structure, and reinforcing ribs are set to increase the service life. Taking the furnace body as an example, refer to Figure 2 The furnace body adopts a wide muffle structure. The furnace shell is welded with steel and steel plates. The combustion port of the combustion nozzle is located at the bottom of the furnace tube, between the furnace bottom plate and the fire channel between the furnace bottom. The furnace tube in the furnace is heated by radiation, which is uniform, accurate and reliable in temperature control, and easy to repair and replace.

[0050] Each furnace body and furnace body are provided with six combustion nozzles (not shown in the figure), and the six combustion nozzles of each furnace body are connected to a combustion fan through an air duct. Each furnace body is also provided with a set of combustion gas exhaust fan and chimney for exhausting combustion waste gas.

[0051] Both the furnace tube 130 and the furnace tube 230 are made of 8mm thick SUS316L stainless steel plate. The cross section of the furnace tube cavity is roughly flat rectangular. The top surface of the rectangular cavity is convex upward as an arc surface to enhance the structural strength of the furnace tube and allow the dry exhaust gas to smoothly enter the top exhaust gas branch pipe. The bottom surface of the rectangular cavity is provided with a wave structure extending along the length direction of the furnace tube, which can enhance the structural strength of the furnace tube on the one hand and supplement the deformation of the furnace tube after heating on the other hand. In order to facilitate transportation and installation, the furnace tube can be made into several sections. During installation, two adjacent sections of the furnace tube are connected by flanges.

[0052] The first roller 112 is installed at the bottom of the feeding section furnace tube 131, the cooling section furnace tube 133, and the discharging section furnace tube 134 of the furnace tube 130. The first roller 112 rolls on the first slide rail 111, and the first slide rail 111 is fixedly installed on the first furnace bottom frame 110. The furnace tube 130 expands due to heat and will be displaced in the axial direction. It is supported by the first roller 112 to move on the slide rail to prevent deviation. Figure 5 The discharge section furnace pipe 134 is also connected to the first discharge device 160 through a corrugated expansion joint 192, and the corrugated expansion joint 192 is used to compensate for the deformation of the furnace pipe. In this embodiment, a corrugated expansion joint can be selected as the displacement compensator 292.

[0053] The second roller 212 is installed at the bottom of the feeding section furnace tube 231, the cooling section furnace tube 233, and the discharging section furnace tube 234 of the second furnace tube 230. The second roller 212 rolls on the second slide rail 211, and the second slide rail 211 is fixedly installed on the second furnace bottom frame 210. The second furnace tube 230 expands due to heat and will be displaced in the axial direction. It is supported by the second roller 212 to move on the slide rail to prevent deviation. Figure 8 The second discharge section furnace pipe 234 is also connected to the second discharge device 260 through a displacement compensator 292, and the displacement compensator 292 is used to compensate for the deformation of the furnace pipe. In this embodiment, a bellows expansion joint can be selected as the displacement compensator 292.

[0054] The additional devices of the steel belt drying furnace and the steel belt pyrolysis reduction furnace, such as the feeding and discharging device, the cooling device, the sealing device, the exhaust gas exhaust device 180 and the metal arsenic collecting device 280, are described in detail below.

[0055] See also Figure 1The exhaust gas exhaust device 180 of the steel belt drying furnace includes an exhaust gas branch pipe arranged in the furnace body and connected to the heating section furnace pipe 132 through the furnace chamber, an exhaust gas main pipe 181 connecting all the exhaust gas branch pipes, a spray tank 182 connected to the exhaust gas main pipe 181, and an exhaust gas fan 183 connected to the spray tank 182. In specific implementation, two DN150 exhaust gas branch pipes are arranged in the first furnace body 121, the second furnace body 122, and the third furnace body 123. The exhaust gas branch pipes pass through the furnace chamber and are connected to the furnace pipes. A regulating valve is arranged on the exhaust gas branch pipe. Six exhaust gas branch pipes are connected to a spray tank 182 through a DN400 exhaust gas main pipe 181. The spray tank 182 is connected to an exhaust gas fan 183 with a suction capacity greater than 3000m3 / h. The outlet of the exhaust gas fan 183 is connected to an exhaust chimney 184. In order to facilitate transportation and installation, the exhaust gas main pipe 181 can be made into several sections. For example, in this embodiment, the exhaust gas main pipe 181 is made into three sections, which are respectively connected to the exhaust gas branch pipes of the three furnace bodies, and the two adjacent sections of the main pipe are connected by a bellows to compensate for thermal deformation. The water vapor and organic waste gas generated by the high-arsenic slag in the furnace tube after being heated and dried are sucked into the spray tank 182 through the exhaust gas fan 183 for leaching and purification, and then discharged through the exhaust chimney 184.

[0056] See also Figure 3The feeding device 140 of the steel belt drying furnace includes a belt conveyor 141 and a distributor 142. In specific implementation, the top of the feeding section furnace tube 131 is provided with a first opening, a second opening and a third opening along its width direction. The first opening is used to connect the first sealing device 191. The first sealing device 191 includes a rectangular sealing shell 1911 installed at the third opening and open at the bottom. A plurality of soft heat-insulating sealing curtains 1912 are sequentially arranged in the sealing shell 1911 along the feeding direction. The multi-layer heat-insulating sealing curtains 1912 are height-adjustable. When installed, a gap is left between the arsenic slag powder and the arsenic slag powder, which can effectively prevent the dust generated when spreading the material from entering the heating section furnace tube. The second opening is used to connect the distributor 142. In this embodiment, the distributor 142 includes a distributor housing 1421 installed at the second opening and open at the bottom, and a pneumatic seasoning flap 1422, two pneumatic shearing knives 1423 and a powder thickness adjustment scraper 1424 are arranged in sequence from front to back in the distributor housing 1421. The pneumatic seasoning flap 1422 is rotatably and tiltably arranged at the front end of the distributor housing 1421 through a rotating shaft, and the two ends of the rotating shaft extend out of the furnace pipe to connect two connecting rods, and the two connecting rods are respectively connected to two flap cylinders, and the base of the flap cylinder is hinged on the first furnace bottom frame 110. The piston rod of the flap cylinder is telescopic, and the pneumatic seasoning flap 1422 is driven to rotate upward or downward through the connecting rod, and the distance between the flap and the steel belt is adjusted to adjust the thickness of the slag layer laid on the steel belt by the belt conveyor 141. The two pneumatic shearing knives 1423 are vertically arranged in the distributor housing 1421, and are driven up and down by the cylinder to loosen the slag layer. The powder thickness adjustment scraper 1424 is vertically installed on the rear side of the distributor housing 1421 through an adjustment screw. The thickness of the slag layer on the steel belt entering the furnace body is adjusted by adjusting the distance between the powder thickness adjustment scraper 1424 and the steel belt. The third opening is used to connect the discharge hopper 1414 of the belt conveyor 141. The belt conveyor 141 is arranged in the housing 1411, and the housing 1411 is fixed above the steel belt tensioning device 174 through a bracket. The front end of the housing 1411 is provided with a feed hopper 1412, and the feed hopper 1412 is used to lay the arsenic slag on the conveyor belt 1413 of the belt conveyor 141; the rear end of the housing 1411 is provided with a discharge hopper 1414, and the bottom of the discharge hopper 1414 is connected to the third opening, so as to fully spread the arsenic slag dropped from the belt on the steel belt in the furnace tube along the width direction.

[0057] See also Figure 4The end of the tube 131 of the feeding section of the steel belt drying furnace is closed by an end cover 1311. The bottom of the end cover 1311 is provided with a strip opening for passing the steel belt, and a soft curtain 1312 for sealing the strip opening is provided in the furnace tube. A steel belt flattening mechanism is provided at the front end of the outer side of the end cover 1311. The steel belt flattening mechanism includes an elastic pressure roller 1314 arranged along the width direction of the steel belt and connected to the steel belt by friction rotation, and a support steel plate 1313 arranged below the elastic pressure roller 1314 for supporting the steel belt. When the steel belt enters the furnace body, the elastic pressure roller 1314 flattens the steel belt to ensure that the steel belt is not deformed when laying the material, and then enters the material distribution device through the sealing of the soft curtain 1312.

[0058] See also Figure 5 The discharge section furnace pipe 134 of the steel belt drying furnace is provided with two sections, each section is provided with a first cooling device 150, and the first cooling device 150 includes a cooling jacket 151 sleeved on the outer periphery of the furnace pipe, an inlet pipe 152 for introducing cooling water into the cooling jacket 151, and an outlet pipe 153 for discharging waste water from the cooling jacket. The last section of the discharge section furnace pipe is connected to the first discharge device 160 through a second sealing device 193 and a corrugated expansion joint 192. The structure of the second sealing device 193 is the same as that of the first sealing device 191. The first discharge device 160 includes a receiving bin 161 and a pair of relatively rotating crushing rollers 162. In specific implementation, the receiving bin 161 and the crushing roller 162 are arranged in a cover body 263 with a conical bottom. The cover body 263 is sealed and connected to the discharge section furnace pipe through a connecting pipe. The front side of the cover body 263 and the bottom of the connecting pipe are provided with an opening for accommodating the first active roller 171. The bottom of the cover body 263 is provided with a discharge port 1631. The inner cavity of the cover body 263 is divided into a feeding chamber and a crushing chamber by two inclined plates. The feeding chamber and the cover body 263 surrounding the feeding chamber form the receiving bin 161. The outlet formed by the two inclined plates is the discharge port 1631 of the receiving bin. The upper part of the inclined plate close to the active roller forms the feeding port. The inclined plate forms a scraper 164 for scraping off the arsenic slag on the steel strip. A pair of crushing rollers 162 are arranged below the outlet of the receiving bin 161 and are driven by a motor to rotate relative to each other. The crushing rollers are provided with blades. The blades of the two crushing rollers shear each other to crush the clusters into small particles. A wire roller brush 163 for cleaning arsenic slag adhering to the steel strip is arranged below the crushing roller 162. An exhaust port is arranged at the top of the cover body 263, and a bag dust collector 165 is installed in the exhaust port.

[0059] See also Figure 7The tube end of the feed section furnace tube 231 of the steel belt type pyrolysis reduction furnace is closed by an end cover, and the bottom of the end cover is provided with a strip opening for passing the steel belt. A pair of furnace head sealing felt rollers 2311 that rotate relatively are provided on the outside of the end cover. The steel belt from the second passive roller 272 passes through the two furnace head sealing felt rollers 2311 and is flattened before entering the furnace tube to ensure that the steel belt is not deformed when laying the material. A nitrogen blowing sealing pipe 2312 is provided on the furnace tube on the inner side of the end cover to pass the sealing nitrogen. The top of the feed section furnace tube 231 is provided with a first opening and a second opening along its width direction. The first opening is used to connect the third sealing device 291. The structure of the third sealing device 291 is the same as that of the first sealing device 191. The second opening is used to connect the feeding device 240.

[0060] See also Figure 7 The feeding device 240 of the steel belt pyrolysis reduction furnace includes a sealing cover 241 installed at the second opening and open at the bottom, a spreader 242 installed in the sealing cover 241 and movable up and down, a feed pipe 1 243 fixed on the sealing cover 241, the lower end of which is slidably connected to the spreader 242 and the upper end of which extends out of the sealing cover 241, a spiral feeder 244 whose outlet is connected to the feed pipe 1 243, a feed bin 245 whose lower feeding port is connected to the inlet of the spiral feeder 244, a feed pipe 246 connected to the top feed port of the feed bin 245, a feed valve installed on the feed pipe 246, a mixing crusher 247 whose outlet is connected to the feed pipe 246, and a high-arsenic slag bin 249 and a catalyst bin 248 respectively connected to the two feed ports of the mixing crusher 247. During specific implementation, the spreader 242 is a rectangular barrel with a width slightly smaller than the width of the steel strip. The rectangular barrel is connected to two nuts through a bracket, and the two nuts are respectively connected to two screws. The two screws spirally pass through the top of the sealing cover 241 to connect two hand wheels. When the hand wheels are turned, the nuts drive the spreader 242 to move up and down along the screws, thereby adjusting the thickness of the material layer. The end of the feed pipe 1 243 extending into the sealing cover 241 is connected to a pipe joint adapted to the rectangular barrel of the spreader 242, and the pipe joint is set in the rectangular barrel. The arsenic slag raw material from the high arsenic slag bin 249 and the catalyst from the catalyst bin 248 are mixed evenly in the mixing pulverizer 247 and enter the feed bin 245 through the feed pipe 2 246, and then quantitatively discharge the material to the furnace tube through the spiral feeder 244, and then evenly spread on the second steel strip 273 through the spreader 242.

[0061] See also Figure 8The discharge section furnace pipe 234 of the steel belt type pyrolysis reduction furnace is provided with five sections in total, each section is provided with a second cooling device 250, and the second cooling device 250 includes a cooling jacket 251 sleeved on the outer periphery of the discharge section furnace pipe 234, a water inlet pipe 252 for introducing cooling water into the cooling jacket 251, and a water outlet pipe 253 for discharging waste water from the cooling jacket. A fourth sealing device 293 is also provided on the discharge section furnace pipe 234, and the structure of the fourth sealing device 293 is the same as that of the third sealing device 291. The discharge section furnace pipe 234 is connected to the second discharge device 260 through a displacement compensator 292. The displacement compensator 292 is used to compensate for the deformation of the furnace pipe. In this embodiment, a bellows expansion joint can be selected as the displacement compensator 292.

[0062] See also Figure 8 The second discharging device 260 includes a second receiving bin 261, a second bag dust collector 265 disposed on the upper part of the receiving bin, a pair of crushing rollers disposed at the bottom outlet of the receiving bin, a screw conveyor 266 disposed below the crushing rollers, and a cover 263 for accommodating the receiving bin, the crushing rollers and the screw conveyor 266. In specific implementation, the cover 263 is sealed and connected to the discharging section furnace pipe through a connecting pipe, and an opening for accommodating the second active roller 271 is provided on the front side of the cover 263 and the bottom of the connecting pipe. The inner cavity of the cover 263 is divided into a feeding cavity and a crushing cavity by two inclined plates. The feeding cavity and the cover 263 surrounding the feeding cavity form a receiving bin, and the outlet formed by the two inclined plates is the discharging port 1631 of the receiving bin. The upper part of the inclined plate close to the active roller forms a feeding port, and the inclined plate forms a scraper 264 for scraping off the arsenic slag on the steel strip. A pair of crushing rollers 262 are arranged below the outlet of the receiving bin 261 and are driven by a motor to rotate relative to each other. Blades are arranged on the crushing rollers. The blades of the two crushing rollers shear against each other to crush the agglomerates into small particles. A wire roller brush 267 is arranged below the crushing roller 262 to clean the arsenic slag adhered to the steel belt. An exhaust port is arranged at the top of the cover body 263, and a bag dust collector 265 is installed in the exhaust port.

[0063] See also Figure 1 and Fig. 9 The top surface of the heating section furnace tube 232 of the steel belt type pyrolysis reduction furnace is provided with an exhaust port, which is connected to the metal arsenic collecting device 280 through an exhaust pipe 281 .

[0064] The metal arsenic collecting device 280 includes a closed box 2801 with a double-conical bottom, a pair of relatively rotating water-cooled collecting rollers 282 arranged in the closed box, and two scrapers 283 respectively arranged on the outside of the two water-cooled collecting rollers 282 for scraping the metal arsenic solidified on the surface of the water-cooled collecting rollers 282 to the bottom of the closed box 2801. In specific implementation, radial rollers 286 are arranged at the lower ends of both sides of the closed box 2801, and the radial rollers 286 roll on two rail steels 287. The two rail steels 287 are arranged on a trolley 288 that can slide axially and can be lifted and lowered through a clamping cylinder 289. The closed box 2801 is arranged on the trolley 288 that can slide axially, which can adapt to the axial expansion and contraction of the furnace tube, so that the air intake short pipe 285 and the exhaust pipe 281 are always sealed and connected. The provision of the radial roller 286 and the rail steel 287 allows the metal arsenic collecting device 280 to be conveniently removed from the furnace top when the metal arsenic needs to be removed, thereby facilitating operation.

[0065] In specific implementation, an exhaust gas inlet is provided between the bottom of the closed box 2801 and the two cones, and the exhaust gas inlet is connected to the air intake short pipe 285, and the air intake short pipe 285 is slidably sealed and connected to the exhaust pipe 281 through a sealing gasket. In the production state, the compression cylinder 289 retracts to drive the closed box 2801 to move downward, and the air intake short pipe 285 is pressed against the upper end surface of the exhaust pipe 281; when the metal arsenic needs to be cleaned, the compression cylinder 289 extends, the closed box 2801 moves upward, and the air intake short pipe 285 is separated from the upper end surface of the exhaust pipe 281, and the closed box 2801 can be pulled out of the rail steel 287. The water-cooled collection roller 282 is a hollow closed roller, one of which is an active roller driven to rotate by a motor, and the other is a passive roller that rotates by friction. Both ends of the two water-cooled collection rollers are connected to the cooling water inlet pipe and the cooling water drain pipe respectively through a rotating joint. Two scrapers 283 are respectively arranged on both sides of the two water-cooled collection rollers 282 through a rotating shaft, and blades are arranged at the free ends of the scrapers, which are in contact with the roller surfaces of the cooling collection rollers 282. Chilled water is passed into the two water-cooled collection rollers 282 through a cold water inlet pipe, and the arsenic vapor generated by the reduction reaction enters the closed box 2801 through an exhaust pipe 281, condenses into solid particles on the surface of the water-cooled collection rollers 282, and is scraped by the scrapers 283 to the conical bottom of the closed box 2801 as the water-cooled collection rollers 282 rotate. After a certain period of accumulation, the metal arsenic collection device 280 is removed from the furnace top, and the arsenic blocks are removed from the arsenic block collection and cleaning port 284.

[0066] When the present invention works,

[0067] The high-arsenic slag raw material is evenly distributed on the first steel belt 173 of the feeding section furnace tube 131 through the feeding device 140 (belt conveyor 141 and distributor 142), and enters the furnace halls of the first furnace body 121, the second furnace body 122 and the third furnace body 123 in sequence as the first steel belt 173 rotates. In the furnace hall, the first steel belt 173 and the high-arsenic slag raw material on the first steel belt 173 are heated by the combustion nozzle and the temperature rises, and the moisture in the high-arsenic slag raw material begins to evaporate. The evaporated water vapor and organic waste gas are sucked into the spray tank 182 by the exhaust gas fan 183 for elution and purification, and then discharged from the smoke chimney 184. The dried high-arsenic slag raw material is cooled by the first cooling device 150 and then enters the first discharging device 160. After being crushed into small particles in the first discharging device 160, it enters the high-arsenic slag silo 249;

[0068] The powdered high-arsenic slag raw material in the high-arsenic slag silo 249 and the catalyst in the catalyst silo 248 are evenly mixed by the mixing crusher 247, and then evenly distributed on the second steel belt 273 of the feeding section furnace tube 231 by the spreading device 242. As the second steel belt 273 rotates, they enter the furnaces of the furnace body 1 221 and the furnace body 2 222 in turn. The reducing gas enters the furnace hall from the rear end of the heating section furnace tube 232. In the furnace hall, the high-arsenic slag raw material reacts with the reducing gas to produce arsenic vapor. The arsenic vapor enters the closed box 2801 through the exhaust pipe 281, is cooled into solid particles, adheres to the water-cooled collecting roller 282, and is scraped to the bottom of the box by the scraper three 283 for temporary collection. The waste slag produced by the reduction reaction is cooled by the second cooling device 250 and then enters the second discharging device 260. It is crushed into small particles in the second discharging device 260 and then output through the screw conveyor 266.

[0069] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-arsenic slag pyrolysis recovery device, characterized in that: include: Steel belt drying furnace and steel belt pyrolysis reduction furnace, The steel belt drying furnace comprises a plurality of furnace bodies arranged in sequence on a first furnace bottom frame (110), a furnace tube (130) passing through the furnace chamber of each furnace body in sequence, and a first steel belt (173) passing through the furnace tube (130) and driven by a first active roller (171) and a first passive roller (172) to circulate and rotate; a plurality of combustion nozzles for radiantly heating the furnace tube are arranged in each furnace body; the furnace tube (130) comprises a feeding section furnace tube (131), a heating section furnace tube (132) and a heating section furnace tube (133) connected in sequence. The furnace body comprises a first furnace pipe (132), a first cooling section furnace pipe (133) and a first discharge section furnace pipe (134); the first feeding section furnace pipe (131) extends from the front end of the furnace body to connect to the feeding device (140); the first cooling section furnace pipe (133) extends from the rear end of the furnace body to connect to the first cooling device (150); the first discharge section furnace pipe (134) extends from the first cooling device (150) to connect to the first discharge device (160); the first heating section furnace pipe (132) located in the furnace body is connected to the exhaust gas exhaust device (180); The steel belt type pyrolysis reduction furnace comprises a plurality of furnace bodies arranged in sequence on a second furnace bottom frame (210), a furnace tube (230) passing through the furnace chamber of each furnace body in sequence, and a second steel belt (273) passing through the furnace tube (230) and driven by a second active roller (271) and a second passive roller (272) to circulate and rotate; each furnace body is provided with a plurality of combustion nozzles for radiantly heating the furnace tube (230); the furnace tube (230) comprises a feed section furnace tube (231), a heating section furnace tube (231) and a heating section furnace tube (231) connected in sequence. The furnace body comprises a second furnace tube (232), a second cooling furnace tube (233) and a second discharge furnace tube (230), wherein the feeding furnace tube (231) extends from the front end of the furnace body to be connected to the feeding device (240), the second cooling furnace tube (233) extends from the rear end of the furnace body to be connected to the second cooling device (250), and the second discharge furnace tube (230) extends from the second cooling device (250) to be connected to the second discharge device (260); the second heating furnace tube (232) located in the furnace body is connected to the metal arsenic collecting device (280); The high-arsenic slag raw material is evenly distributed on the first steel belt (173) of the feed section furnace tube (231) through the feeding device (140), and enters the furnace hall of the furnace body as the first steel belt (173) rotates. In the furnace hall, the first steel belt (173) and the high-arsenic slag raw material on the first steel belt (173) are heated by the combustion nozzle and the temperature rises, and the moisture in the high-arsenic slag raw material begins to evaporate. The evaporated water vapor and organic waste gas are sucked into the exhaust gas exhaust device (180) for elution and purification. The high-arsenic slag raw material with dried moisture is cooled by the first cooling device (150) and then enters the first discharging device (160). It is crushed into small particles in the first discharging device (160) and then enters the feeding device (240). The dried powdered high-arsenic slag raw material and the catalyst are mixed evenly through the feeding device (240) and then evenly distributed on the second steel belt (273) of the feeding section furnace tube (231). As the second steel belt (273) rotates, it enters the furnace chamber of the furnace body. The reducing gas is introduced into the furnace chamber from the rear end of the heating section furnace tube (232). In the furnace chamber, the high-arsenic slag raw material and the reducing gas undergo a reduction reaction to generate arsenic vapor. The arsenic vapor enters the metal arsenic collecting device (280) and is cooled into solid particles. The waste slag generated by the reduction reaction is cooled by the second cooling device (250) and then enters the second discharging device (260). It is crushed into small particles in the second discharging device (260) and then output.

2. The high-arsenic slag pyrolysis recovery device according to claim 1, characterized in that: The feeding device (140) includes a belt conveyor (141) and a distributor (142). The belt conveyor (141) is arranged in a shell (1411). A feed hopper (1412) is arranged at the front end of the shell (1411). The feed hopper (1412) is used to spread the arsenic slag on the conveyor belt (1413) of the belt conveyor (141); a discharge hopper (1414) is arranged at the rear end of the shell (1411). The bottom of the discharge hopper (1414) is inserted into the furnace tube (130) to fully spread the arsenic slag dropped from the belt on the steel belt in the furnace tube (130) along the width direction; the distributor (142) includes a A distributor (142) shell (1411) with an opening on the top and an open bottom (130), a pneumatic material seasoning flap (1422), a pneumatic shearing knife and a powder thickness adjustment scraper (1424) are sequentially arranged in the distributor (142) shell (1411), the pneumatic material seasoning flap (1422) is driven to rotate by a cylinder to adjust the distance between the flap and the steel belt, thereby adjusting the thickness of the slag layer laid on the steel belt by the belt conveyor (141), the pneumatic shearing knife is driven by the cylinder to move up and down to loosen the slag layer, and the powder thickness adjustment scraper (1424) is used to adjust the distance between the scraper and the steel belt, thereby adjusting the thickness of the slag layer on the steel belt entering the furnace body.

3. The high-arsenic slag pyrolysis recovery device according to claim 1, characterized in that: The exhaust gas exhaust device (180) includes an exhaust gas branch pipe arranged in the furnace body and passing through the furnace chamber and connected to the heating section furnace pipe 1 (132), an exhaust gas main pipe (181) connecting all the exhaust gas branch pipes, a spray tank (182) connected to the exhaust gas main pipe (181), and an exhaust gas fan (183) connected to the spray tank (182).

4. The high-arsenic slag pyrolysis recovery device according to claim 1, characterized in that: The first discharging device (160) comprises a receiving bin (161) for receiving the arsenic slag falling from the first steel belt (173) coming out of the second discharging end furnace tube (234), a pair of relatively rotating crushing rollers (162) arranged at the bottom outlet of the receiving bin (161) for crushing the arsenic slag powder falling from the outlet of the receiving bin (161) into small particles, and a hood-type powder receiving bin (1611) for accommodating the receiving bin (161) and the crushing rollers (162).

5. The high-arsenic slag pyrolysis recovery device according to claim 1, characterized in that: The second discharging device (260) comprises a slag receiving bin for receiving slag falling from the second steel belt (273) from the second discharging end furnace pipe (234), a pair of slag crushing rollers arranged at the bottom outlet of the slag receiving bin for crushing slag powder falling from the outlet of the slag receiving bin into small particles, a hood-type powder receiving machine (2611) for accommodating the slag receiving bin and the slag crushing rollers, and a slag conveyor arranged at the bottom of the hood-type powder receiving machine (2611).

6. The high-arsenic slag pyrolysis recovery device according to claim 1, characterized in that: The feeding device (240) includes a feeding bin (245), a screw feeder (244) arranged at the bottom outlet of the feeding bin (245), a feeding pipe (246)(243) whose upper end is connected to the screw feeder (244) and whose lower end is inserted into the second furnace tube (230), a spreader (242) connected to the feeding pipe (246)(243), a mixing and pulverizing machine (247) connected to the feeding bin (245) through the feeding pipe (246)(243), and a high-arsenic slag bin (249) and a catalyst bin (248) respectively connected to two feeding ports of the mixing and pulverizing machine (247).

7. The high-arsenic slag pyrolysis recovery device according to claim 1, characterized in that: The metal arsenic collection device (280) comprises a closed box (2801) with a double-conical bottom, a pair of relatively rotatable water-cooled collection rollers (282) arranged in the closed box (2801), and two scrapers respectively arranged on the outsides of the two water-cooled collection rollers (282) for scraping the metal arsenic solidified on the surfaces of the water-cooled collection rollers (282) to the bottom of the closed box (2801), and both conical bottoms are provided with arsenic block collection and cleaning ports (284).

8. The high-arsenic slag pyrolysis recovery device according to claim 1, characterized in that: The first cooling device (150) and the second cooling device (250) have the same structure, and both include a cooling jacket 1 (151) and a cooling jacket 2 (251) sleeved on the outer circumference of the furnace tube, a water inlet pipe 1 (152) and a water inlet pipe 2 (252) for introducing cooling water into the cooling jacket 1 (151) or the cooling jacket 2 (251), and a water outlet pipe 1 (153) and a water outlet pipe 2 (253) for discharging hot water from the cooling jacket 1 (151) and the cooling jacket 2 (251).

9. The high-arsenic slag pyrolysis recovery device according to claim 1, characterized in that: The bottoms of the feed section furnace tube (231), the cooling section furnace tube 1 (133), the cooling section furnace tube 2 (233), the discharge end furnace tube 1 (134) and the discharge end furnace tube 2 (234) are all provided with a first roller (112) or a second roller (212), and the first roller (112) is slidably connected to a first slide rail (111) laid on a first furnace bottom frame (110); the bottoms of the feed section furnace tube (231), the cooling section furnace tube 1 (133) and the discharge end furnace tube 1 (234) are all provided with a first roller (112) or a second roller (212), and the second roller (212) is slidably connected to a second slide rail (211) laid on a second furnace bottom frame (210).

10. The high-arsenic slag pyrolysis recovery device according to claim 1, characterized in that: The passive rollers of the steel belt drying furnace and the steel belt pyrolysis reduction furnace are both provided with a steel belt tensioning device (174), which comprises a base frame (1741), a tensioning pulley (1742), a roller trolley (1743), a traction rope (1744) and a counterweight (1745). The base frame (1741) is provided with a guide rail, the passive roller is rotatably mounted on the roller trolley (1743), a roller is mounted at the bottom of the roller trolley (1743), and the roller rolls on the guide rail, one end of the traction rope (1744) is fixedly connected to the counterweight (1745), and the other end of the traction rope passes around the tensioning pulley (1742) and is fixedly connected to the roller trolley (1743).

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