A device for treating arsenic-containing waste residue and a method for treating arsenic-containing waste residue

Abstract

The application discloses a kind of arsenic-containing waste residue processing device, including sealed pipe, the sealed pipe includes heating reduction section and condensing section, the heating reduction section is located above the condensing section, reaction load part is equipped in the heating reduction section, and the heating reduction section and condensing section are respectively equipped with reduction temperature control part and condensing temperature control part for controlling the temperature of heating reduction section and condensing section.The application also provides a kind of method for processing arsenic-containing waste residue using the above-mentioned arsenic-containing waste residue processing device.The arsenic-containing waste residue processing device of the application includes integrated heating reduction section and condensing section, arsenic vapor generated by heating reduction section directly enters condensing section for condensation, and the temperature of heating reduction section and condensing section is controlled by reduction temperature control part and condensing temperature control part respectively, which can realize the condensation of arsenic vapor within a certain temperature range to obtain α-single-element arsenic, and the purity of single-element arsenic is higher.

Description

Technical Field

[0001] This invention belongs to the field of solid waste treatment, and particularly relates to a treatment device for arsenic-containing waste residue and a method for treating arsenic-containing waste residue. Background Technology

[0002] Arsenic is widely distributed in nature, primarily existing as sulfides alongside gold, copper, lead, tin, zinc, nickel, and cobalt ores. During the mining and smelting of these minerals, arsenic-containing waste slag and arsenic-containing dust are generated, and some arsenic also enters wastewater. Currently, precipitation and solidification are the most common methods for treating arsenic-containing wastewater, resulting in a large amount of arsenic-containing waste slag generated in metallurgical production. Most companies treat this waste slag through landfill or stockpiling, but arsenic compounds are highly toxic, and untreated arsenic poses a significant threat to the environment and human health. Furthermore, arsenic is also an important resource, used in the production of wood preservatives and pesticides. In the alloy industry, it can be used as an alloying additive to manufacture arsenic-lead alloys and arsenic-copper alloys. High-purity arsenic is a raw material for producing compound semiconductors such as indium arsenide and gallium arsenide, and is also a doping element in semiconductor materials such as silicon and germanium. Additionally, arsenic has pharmacological and physiological effects and is widely used in the medical and health fields. Arsenic compounds are all highly toxic, but elemental arsenic is non-toxic. Therefore, extracting and recovering non-toxic and useful elemental arsenic from arsenic-containing waste residue is a full utilization of secondary resources and also contributes to environmental protection.

[0003] Currently, the main treatment methods for arsenic-containing waste residue fall into two categories: stabilization and solidification, and resource utilization. Stabilization involves using inert materials to encapsulate the arsenic in the waste residue, ensuring good sealing or altering the form of arsenic to a chemically stable form such as arsenates. However, the stabilization effect is poor, secondary pollution is prone to occur, and large amounts of landfill space are required. Resource utilization uses pyrometallurgical or hydrometallurgical processes to recover valuable resources such as copper, zinc, and arsenic from the arsenic-containing waste residue. Pyrometallurgical processes mainly convert arsenic compounds into arsenic trioxide and recover arsenic from the flue gas, but this method produces low-purity products and causes severe secondary pollution. Hydrometallurgical processes mainly use acid or alkaline leaching to separate different valuable elements, and then further recover copper, zinc, arsenic, etc. However, hydrometallurgical processes are lengthy, generate large amounts of wastewater, and generally have high production costs.

[0004] For arsenic-containing waste residue, patent CN111304447A discloses a method and equipment for recovering arsenic from titanium arsenic slag. Using titanium arsenic slag as raw material, the slag is first pyrolyzed to obtain arsenic oxide vapor. Then, the arsenic oxide vapor is reduced to arsenic vapor using a carbon layer, which is then condensed to obtain elemental arsenic. While the method and equipment are simple, their processing capacity is small and cannot meet the needs of large-scale industrial production. Furthermore, the method and equipment only perform a crude condensation of arsenic vapor, making it difficult to guarantee the purity of the obtained elemental arsenic. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the background art above, and to provide a treatment device for arsenic-containing waste residue with high product purity that is conducive to industrial production, as well as a method for treating arsenic-containing waste residue using the above treatment device.

[0006] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows:

[0007] A device for treating arsenic-containing waste residue includes a sealed tube, which includes a heating reduction section and a condensation section. The heating reduction section is located above the condensation section. The heating reduction section is provided with a reactant support part. The heating reduction section and the condensation section are respectively provided with a reduction temperature control part and a condensation temperature control part for controlling the temperature of the heating reduction section and the condensation section.

[0008] This invention fully utilizes the high density of arsenic vapor, which naturally settles due to gravity. By placing the condensation section below the heating and reduction section, it facilitates efficient condensation of arsenic vapor. Furthermore, this invention integrates the heating and reduction section and the condensation section into a single sealed tube. The arsenic vapor generated in the heating and reduction section falls directly into the condensation section, eliminating the need for external transition connections and insulation. This results in a simpler overall device, better temperature control in the condensation section, and a higher probability of producing purer elemental arsenic.

[0009] In the aforementioned arsenic-containing waste treatment device, preferably, the condensation section is equipped with a product collection section for collecting the condensed products. The product collection section facilitates the condensation and adhesion of arsenic vapor, promoting efficient condensation and enrichment of arsenic vapor, and preventing arsenic vapor from directly condensing on the inner wall of the sealed pipe, which would hinder arsenic collection.

[0010] In the aforementioned arsenic-containing waste treatment device, preferably, the product collection section is a collection sleeve attached to the wall of the condensation section. The collection sleeve can be made of stainless steel, and its close attachment to the inner wall of the condensation section facilitates the condensation and enrichment of arsenic vapor. Once the arsenic vapor has completely condensed, the stainless steel collection sleeve can be directly removed, and the attached elemental arsenic can be peeled off.

[0011] In the aforementioned arsenic-containing waste treatment device, preferably, the product collection section includes a collection sleeve and a conical cylinder. The collection sleeve is attached to the pipe wall of the condensation section, and the conical cylinder is disposed in the condensation section. The conical cylinder is wider at the bottom and narrower at the top, and an exhaust port is provided at the top of the conical cylinder. The bottom of the conical cylinder is seamlessly connected to the collection sleeve. If the collection sleeve is used directly in this invention, in order to ensure the recovery rate of arsenic vapor, the condensation section generally needs to be set to be relatively long. Otherwise, some arsenic vapor will be discharged directly without condensation, reducing the recovery rate, or it may not be condensed within the temperature range required by this invention, resulting in non-α-elemental arsenic and a decrease in product purity. At the same time, if a large amount of product adheres to the collection sleeve, elemental arsenic may peel off, resulting in product waste. In addition, setting the condensation section to be relatively long will result in a larger equipment size and an increase in the cost of the corresponding insulation device, especially in industrial production, where the requirements for production site and production cost are higher. The product collection section of this invention employs an interconnected collection sleeve and a conical cylinder. Through the guiding and restricting effect of the conical cylinder, the arsenic vapor flowing from the heating reduction section into the condensation section exhibits a bottom-to-top and then outward discharge trend. This significantly increases the residence time of arsenic vapor in the condensation section, facilitating efficient condensation and enrichment of all arsenic vapor within the condensation section, resulting in higher product purity and recovery rate. It also reduces the length of the condensation section while achieving better condensation performance. Simultaneously, the interconnected collection sleeve and conical cylinder increase the area available for arsenic vapor enrichment and facilitate arsenic vapor condensation. Furthermore, the seamless connection between the bottom of the conical cylinder and the collection sleeve creates a product collection trough, collecting products detached from the cylinder wall and preventing product waste. For better product collection, the collection sleeve and conical cylinder can be connected via a base plate to form a square-like trough.

[0012] In this invention, the product collection section adopts a structure of a collection sleeve and a conical cylinder. Targeted improvements and optimizations can be made to other components as follows: 1. The reaction vessel opening faces upwards, and the outer diameter of the reaction vessel is controlled to be similar to the inner diameter of the sealing tube. For example, the outer diameter of the reaction vessel is 4 / 5 of the inner diameter of the sealing tube. This allows most of the arsenic vapor generated in the heating reduction section to flow downwards along the inner wall of the condensation section, facilitating better coordination with the product collection section. 2. The conical cylinder can be directly connected to the support frame of the reactant carrier (preferably a detachable connection). For example, the conical cylinder is fitted onto the support frame, with its top connected to the support frame, and an exhaust port is reserved at the connection point. In this case, the product collection section and the reactant carrier are a single integrated structure, allowing simultaneous loading and unloading, reducing the need for separate loading and unloading steps. 3. The conical cylinder essentially covers the support frame in the condensation section, preventing arsenic vapor from condensing and accumulating on the support frame.

[0013] In the aforementioned arsenic-containing waste residue treatment device, preferably, the reactant support unit includes a reaction vessel and a support frame. The support frame has a lower flange at its bottom, and the sealing pipe has an upper flange at its bottom. The reactant support unit is detachably mounted in the sealing pipe via the connection between the upper and lower flanges. A corrugated pipe can be installed on the lower flange. The corrugated pipe's function is to make the pipe connection flexible, protect the sealing pipe, and facilitate connection. The connection between the upper and lower flanges facilitates the loading and unloading of the reactant support unit and makes disassembly more convenient.

[0014] In the aforementioned arsenic-containing waste residue treatment device, preferably, two sealing pipes are fixedly installed side-by-side with one sealing pipe support. A downward-extending guide support column is provided in the middle of the two side-by-side sealing pipes. The reactant carrying parts are arranged in two groups of four. The lower flanges below the two reactant carrying parts in each group are connected as a whole by a lower flange support. Each group of two reactant carrying parts is slidably and rotatably mounted on the guide support column, supported by the lower flange. This treatment device with the above-mentioned structure includes two reduction-condensation systems and four infeed / discharge systems. While the two reduction-condensation systems are reacting, the other two infeed / discharge systems can be loaded, improving production efficiency. Specifically, when one group of two reactant carrying parts is working, the other group of two reactant carrying parts is in a feeding or discharging state. When the first group of two reactant carrying parts has finished working, it is disassembled from the bottom of the sealing pipe via the flange and slid and rotated downwards via the guide support column so as not to affect the docking of the other group of two reactant carrying parts with the sealing pipe. After the first set of two reactant carriers is disassembled, the second set of two reactant carriers rotates and slides up and down to connect with the sealing tube, and is sealed by the flange to continue operation. The two reactant carriers disassembled in the first set are then used for unloading and feeding. In this way, the device can operate efficiently and continuously. Of course, to further increase efficiency, more sealing tubes and reactant carriers can be added.

[0015] In the aforementioned arsenic-containing waste residue treatment device, preferably, the reduction temperature control unit includes a first heating unit, a first insulation layer, and a first outer shell. The first heating unit directly contacts the outer wall of the sealing tube, the first insulation layer is wrapped around the first heating unit, and the first outer shell is wrapped around the first insulation layer. The condensation temperature control unit includes a second heating unit, a second insulation layer, and a second outer shell. The second heating unit directly contacts the outer wall of the sealing tube, the second insulation layer is wrapped around the second heating unit, and the second outer shell is wrapped around the second insulation layer. The aforementioned reduction temperature control unit and condensation temperature control unit can adopt an integrated structure, that is, their outer shells are a single unit, which is more aesthetically pleasing and easier to manage. Furthermore, the heat generated by the first heating unit diffuses downwards, which helps to reduce the energy consumption of the second heating unit. The aforementioned reduction temperature control unit and condensation temperature control unit can be a vertical split heating furnace, which can be wrapped around the sealed tube (such as a single-hole quartz tube) and connected by resistance wire wrapped around refractory material. It can heat the inside of the single-hole quartz tube. The insulation layer is wrapped around the electric heating layer, which can ensure that the internal temperature of the quartz tube remains constant after heating stops. The outer shell is wrapped around the insulation layer, which plays a further role in protection and insulation.

[0016] In the aforementioned arsenic-containing waste treatment device, preferably, the top of the sealing pipe is arc-shaped, and the bottom of the sealing pipe is provided with a tail gas discharge port. The arc-shaped top is more conducive to the downward movement of arsenic vapor. The tail gas discharge port facilitates the treatment of uncondensed tail gas, and the tail gas discharge port can be connected to a tail gas treatment device.

[0017] In the above-mentioned arsenic-containing waste residue treatment device, the sealing pipe can be made of heat-resistant materials such as single-port quartz tube.

[0018] As a general technical concept, the present invention also provides a method for treating arsenic-containing waste residue using the above-mentioned arsenic-containing waste residue treatment device, comprising the following steps: mixing the arsenic-containing waste residue with a reducing agent, adding it to the reactant support section, and then sealing the sealing tube; using the reduction temperature control section and the condensation temperature control section to control the temperature of the heating reduction section and the condensation section respectively, the arsenic-containing vapor generated by the reactant support section moves from the heating reduction section to the condensation section and is condensed and enriched in the condensation section, and the collected arsenic is obtained as elemental arsenic.

[0019] In the above method for treating arsenic-containing waste residue, preferably, the arsenic-containing waste residue is mainly composed of calcium arsenate, sodium arsenate or ferric arsenate, and the reducing agent includes carbon powder; the temperature of the heating reduction section is controlled to be not lower than 700℃, and the temperature of the condensation section is controlled to be 350-450℃.

[0020] In the above-mentioned method for treating arsenic-containing waste residue, preferably, when the arsenic-containing waste residue and carbon powder are mixed evenly and then loaded into the reaction vessel of the reactant carrier, the total amount of material shall not be less than two-thirds and not more than three-quarters of the reaction vessel volume.

[0021] In this invention, the temperatures of the heating reduction section and the condensation section are controlled by the reduction temperature control section and the condensation temperature control section, respectively. Arsenic-containing waste residue reacts with the reducing agent in the reactant support section to produce CO / CO2 and arsenic vapor. Because of its higher density, the arsenic vapor settles downwards under gravity and is condensed in the condensation section to obtain elemental arsenic, which is then collected in an arsenic collection tank. By controlling the temperature of the condensation section, arsenic vapor can be condensed within a certain temperature range to obtain α-elemental arsenic, resulting in higher purity elemental arsenic.

[0022] Compared with the prior art, the advantages of the present invention are as follows:

[0023] 1. The arsenic-containing waste residue treatment device of the present invention includes an integrated heating reduction section and a condensation section. The arsenic vapor generated in the heating reduction section directly enters the condensation section for condensation. The temperature of the heating reduction section and the condensation section are controlled by the reduction temperature control section and the condensation temperature control section respectively, so that the arsenic vapor can be condensed within a certain temperature range to obtain α-elemental arsenic with higher purity.

[0024] 2. The processing device and method of the present invention reduce arsenic in arsenic-containing waste residue to elemental arsenic product under relatively short process conditions, with a large one-time processing capacity, simple structure, and meets the needs of industrial production. This process and equipment provide a technical basis for short-process open-loop treatment and resource recovery of arsenic-containing waste residue in the metallurgical industry. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a front view of the arsenic-containing waste residue treatment device of the present invention.

[0027] Figure 2 This is a side view of the arsenic-containing waste treatment apparatus of the present invention.

[0028] Figure 3 This is a top view of the arsenic-containing waste treatment apparatus of the present invention.

[0029] Figure 4 for Figure 1 Cross-sectional view of surface AA.

[0030] Figure 5 for Figure 1 A cross-sectional view of the AA surface, another structural form in the design.

[0031] Legend:

[0032] 1. Sealing pipe; 101. Heating and reduction section; 102. Condensation section; 2. Reactant support section; 201. Reactor; 202. Support frame; 3. Reduction temperature control section; 301. First heating section; 302. First insulation layer; 303. First outer shell; 4. Condensation temperature control section; 401. Second heating section; 402. Second insulation layer; 403. Second outer shell; 5. Collection sleeve; 6. Conical cylinder; 7. Lower flange; 8. Upper flange; 9. Sealing pipe support; 10. Guide support column; 11. Lower flange support; 12. Exhaust gas outlet; 13. Connecting corrugated pipe. Detailed Implementation

[0033] To facilitate understanding of the present invention, the present invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0034] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0035] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0036] Example 1:

[0037] like Figures 1-3 As shown, the arsenic-containing waste residue treatment device of this embodiment includes a sealing tube 1. The sealing tube 1 includes a heating reduction section 101 and a condensation section 102. The heating reduction section 101 is located above the condensation section 102. A reactant support section 2 is provided in the heating reduction section 101. A reduction temperature control section 3 and a condensation temperature control section 4 are respectively provided outside the heating reduction section 101 and the condensation section 102 for controlling the temperature of the heating reduction section 101 and the condensation section 102.

[0038] In this embodiment, the condensation section 102 is provided with a product collection section for collecting condensed products.

[0039] Specifically, such as Figure 4 As shown, in this embodiment, the product collection part is a collection sleeve 5 attached to the wall of the condensation section 102. Specifically, the collection sleeve 5 can be a stainless steel sleeve.

[0040] Specifically, such as Figure 5As shown, another structural form of the product collection section is also possible. The product collection section includes a collection sleeve 5 and a conical cylinder 6. The collection sleeve 5 is attached to the wall of the condensation section 102, and the conical cylinder 6 is located within the condensation section 102. The conical cylinder 6 is wider at the bottom and narrower at the top, and an exhaust port is provided at the top. The bottom of the conical cylinder 6 is seamlessly connected to the collection sleeve 5. Both the collection sleeve 5 and the conical cylinder 6 can be made of stainless steel. The top of the conical cylinder 6 can be directly connected to the support frame 202 to achieve synchronous loading and unloading with the reactant support section 2. Figure 5 The product collection section can save the length of the condensation section 102, which is beneficial for industrial production.

[0041] In this embodiment, the reactant support 2 includes a reaction vessel 201 and a support frame 202. The support frame 202 has a lower flange 7 at its bottom, and the sealing tube 1 has an upper flange 8 at its bottom. The reactant support 2 is detachably disposed in the sealing tube 1 through the connection between the upper flange 8 and the lower flange 7. A corrugated pipe 13 can be installed on the lower flange 7 to protect the sealing tube 1 and facilitate docking.

[0042] In this embodiment, two sealing tubes 1 are fixed in parallel by a sealing tube support 9. A guide support column 10 extending downward is provided in the middle of the two parallel sealing tubes 1. The reactant carrier 2 is provided in two groups of four. The lower flanges 7 below the two reactant carriers 2 in each group are connected into a whole by a lower flange support 11. The two reactant carriers 2 in each group are slidably and rotatably mounted on the guide support column 10 by the lower flange support 11.

[0043] In this embodiment, the reduction temperature control unit 3 includes a first heating unit 301, a first insulation layer 302, and a first outer shell 303. The first heating unit 301 is in direct contact with the outer wall of the sealing tube 1, the first insulation layer 302 is wrapped around the first heating unit 301, and the first outer shell 303 is wrapped around the first insulation layer 302. The condensation temperature control unit 4 includes a second heating unit 401, a second insulation layer 402, and a second outer shell 403. The second heating unit 401 is in direct contact with the outer wall of the sealing tube 1, the second insulation layer 402 is wrapped around the second heating unit 401, and the second outer shell 403 is wrapped around the second insulation layer 402. The reduction temperature control unit 3 and the condensation temperature control unit 4 can be integrated into one unit.

[0044] In this embodiment, the top of the sealing tube 1 is arc-shaped, and the bottom of the sealing tube 1 is provided with an exhaust port 12.

[0045] The method for treating arsenic-containing waste using the aforementioned arsenic-containing waste treatment device in this embodiment includes the following steps: mixing the arsenic-containing waste with carbon black or activated carbon and adding it to the reaction vessel 201 of the reactant support section 2, and sealing it with a flange; using the reduction temperature control section 3 and the condensation temperature control section 4 to control the temperatures of the heating reduction section 101 and the condensation section 102 to 900°C and 370°C respectively; the arsenic-containing vapor generated in the reaction vessel 201 moves from the heating reduction section 101 to the condensation section 102 and is condensed in the condensation section 102, and is enriched by a stainless steel sleeve attached to the inner wall of the condensation section 102, and α-elemental arsenic (purity ≥ 99.99%) is obtained by collection; the entire reduction-condensation process takes 60 minutes, and the arsenic recovery rate is 98.03%.

[0046] The chemical composition of the above-mentioned arsenic-containing waste residue is shown in Table 1 below:

[0047] Table 1: Chemical composition of arsenic-containing waste residue in Example 1

[0048]

[0049] Example 2:

[0050] The treatment device for arsenic-containing waste residue in this embodiment is the same as that in Embodiment 1.

[0051] The method for treating arsenic-containing waste using the above-mentioned arsenic-containing waste treatment device in this embodiment includes the following steps: mixing arsenic-containing waste (whose composition is the same as in Example 1) with carbon black or activated carbon, adding it to the reaction vessel 201 of the reactant support section 2, and sealing it with a flange; using the reduction temperature control section 3 and the condensation temperature control section 4 to control the temperatures of the heating reduction section 101 and the condensation section 102 to 1000°C and 370°C respectively, the arsenic-containing vapor generated in the reaction vessel 201 moves from the heating reduction section 101 to the condensation section 102 and is condensed in the condensation section 102, and is enriched by a stainless steel sleeve attached to the inner wall of the condensation section 102, and α-elemental arsenic (purity ≥ 99.99%) is obtained by collection. The entire reduction-condensation process takes 60 minutes, and the arsenic recovery rate is 99.3%.

Claims

1. A device for treating arsenic-containing waste residue, characterized in that, The device includes a sealing tube (1), which includes a heating reduction section (101) and a condensation section (102). The heating reduction section (101) is located above the condensation section (102). The heating reduction section (101) is provided with a reactant support section (2). The heating reduction section (101) and the condensation section (102) are respectively provided with a reduction temperature control section (3) and a condensation temperature control section (4) for controlling the temperature of the heating reduction section (101) and the condensation section (102). The condensation section (102) is provided with a product collection section for collecting condensed products; The product collection section includes a collection sleeve (5) and a conical cylinder (6). The collection sleeve (5) is attached to the pipe wall of the condensation section (102). The conical cylinder (6) is located in the condensation section (102). The conical cylinder (6) is larger at the bottom and smaller at the top, and an exhaust port is provided at the top of the conical cylinder (6). The bottom of the conical cylinder (6) is seamlessly connected to the collection sleeve (5). The reactant support (2) includes a reaction vessel (201) and a support frame (202). The conical cylinder (6) is fitted onto the support frame (202). The top of the conical cylinder (6) is detachably connected to the support frame (202). An exhaust port is reserved at the fixed connection position between the two. The conical cylinder (6) basically covers the support frame (202) in the condensation section (102). The support frame (202) has a lower flange (7) at the bottom, the sealing tube (1) has an upper flange (8) at the bottom, and the reactant carrier (2) is detachably disposed in the sealing tube (1) through the connection between the upper flange (8) and the lower flange (7). The sealing tube (1) is fixed in two parallel positions by a sealing tube support (9). A guide support column (10) extending downward is provided in the middle of the two parallel sealing tubes (1). The reactant carrier (2) is provided in four groups. The lower flange (7) below the two reactant carriers (2) in each group is connected into a whole by a lower flange support (11). The two reactant carriers (2) in each group are slidable and rotatable on the guide support column (10) by the lower flange support (11).

2. The arsenic-containing waste residue treatment device according to claim 1, characterized in that, The reduction temperature control unit (3) includes a first heating unit (301), a first insulation layer (302), and a first outer shell (303). The first heating unit (301) is in direct contact with the outer wall of the sealing tube (1). The first insulation layer (302) is wrapped around the first heating unit (301), and the first outer shell (303) is wrapped around the first insulation layer (302). The condensation temperature control unit (4) includes a second heating unit (401), a second insulation layer (402), and a second outer shell (403). The second heating unit (401) is in direct contact with the outer wall of the sealing tube (1). The second insulation layer (402) is wrapped around the second heating unit (401), and the second outer shell (403) is wrapped around the second insulation layer (402).

3. The arsenic-containing waste residue treatment device according to claim 1, characterized in that, The top of the sealing tube (1) is arc-shaped, and the bottom of the sealing tube (1) is provided with an exhaust port (12).

4. A method for treating arsenic-containing waste residue using the treatment apparatus according to any one of claims 1-3, characterized in that, Includes the following steps: Arsenic-containing waste residue is mixed with reducing agent and added to the reactant support section (2), and then the sealing tube (1) is sealed. The temperature of the heating reduction section (101) and the condensation section (102) are controlled by the reduction temperature control section (3) and the condensation temperature control section (4) respectively. The arsenic-containing vapor generated by the reactant support section (2) moves from the heating reduction section (101) to the condensation section (102) and is condensed and enriched in the condensation section (102). Elemental arsenic is obtained by collecting the vapor.

5. The method for treating arsenic-containing waste residue according to claim 4, characterized in that, The arsenic-containing waste residue is mainly composed of calcium arsenate, sodium arsenate or ferric arsenate, and the reducing agent includes carbon powder; the temperature of the heating reduction section (101) is controlled to be no less than 700°C, and the temperature of the condensation section (102) is controlled to be 350-450°C.

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