A high-efficiency non-pollution high-purity arsenic preparation device and preparation method

Abstract

The application discloses a high-efficiency and pollution-free high-purity arsenic preparation device and a preparation method, and belongs to the technical field of high-purity arsenic preparation. The output shaft of a driving motor drives a screw rod to rotate, the screw rod can drive raw arsenic to be upwardly conveyed and simultaneously subjected to preliminary crushing treatment, meanwhile, a flow valve is opened, hydrogen sulfide gas enters a flow guide pipe, and is sprayed out from four spray pipes at the bottom of the flow guide pipe, when the raw arsenic moves to the position of a discharge hole, the hydrogen sulfide gas sprayed out from the spray pipes directly contacts the raw arsenic fully, due to the continuous rotation of the screw rod, the raw arsenic can be discharged from the four discharge holes, the crushed and mixed raw arsenic can be again concentrated at the bottom of the tank body, the raw arsenic is upwardly conveyed by the screw rod, and the hydrogen sulfide gas is again sprayed to the raw arsenic, the contact area of the hydrogen sulfide gas and the raw arsenic is increased, the circulation is continued, the flowability of the raw arsenic in the tank body is increased, the preparation efficiency of the high-purity arsenic is improved, and meanwhile, the quality of the product is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-purity arsenic preparation, and particularly relates to a high-efficiency and pollution-free high-purity arsenic preparation device and a preparation method. BACKGROUND

[0002] Arsenic, commonly known as arsenic, element symbol As, is a non-metallic element in the periodic table of chemical elements, located in the 4th period and VA group, with an atomic number of 33, and the single substance exists in the form of three allotropes of gray arsenic, black arsenic and yellow arsenic. Arsenic exists widely in nature, and hundreds of arsenic minerals have been found. Arsenic and its compounds are used in pesticides, herbicides, insecticides, and many alloys. Its compound arsenic trioxide is called arsenic, which is a highly toxic substance.

[0003] (1) The main method for preparing high-purity arsenic at present is sublimation distillation and chlorination reduction. Although the sublimation distillation method has a short process, it has the defect that lead, antimony and other impurities are easy to contaminate the product. The chlorination reduction method has the problems of corrosion of hydrogen chloride to equipment and environmental pollution, harsh production conditions, high energy consumption, large equipment investment, and improper operation condition control is easy to cause leakage, which causes great harm to the human body and the environment.

[0004] (2) In the process of preparing high-purity arsenic, the broken arsenic usually needs to be mixed with a reaction agent for reaction. The mixing method is relatively single, and the stirring mechanism usually rotates in the horizontal direction for mixing, so that the raw materials at the bottom of the tank and the upper layer of raw materials in the tank cannot be fully mixed, and the reaction agent is difficult to fully contact with the raw materials, which makes the flowability of the raw materials poor, greatly reduces the preparation efficiency, and further affects the quality of the product.

[0005] Therefore, a high-efficiency and pollution-free high-purity arsenic preparation device and a preparation method are provided to solve the above problems. SUMMARY

[0006] In order to overcome the above defects, the application provides a high-efficiency and pollution-free high-purity arsenic preparation device and a preparation method, which solves the problems of corrosion of hydrogen chloride to equipment and environmental pollution in the chlorination reduction method, harsh production conditions, high energy consumption, large equipment investment, and improper operation condition control is easy to cause leakage, which causes great harm to the human body and the environment. At the same time, in the process of preparing high-purity arsenic, the broken arsenic usually needs to be mixed with a reaction agent for reaction. The mixing method is relatively single, and the stirring mechanism usually rotates in the horizontal direction for mixing, so that the raw materials at the bottom of the tank and the upper layer of raw materials in the tank cannot be fully mixed, and the reaction agent is difficult to fully contact with the raw materials, which makes the flowability of the raw materials poor.

[0007] In order to achieve the above object, the present application provides the following technical scheme: a high-efficiency and pollution-free high-purity arsenic preparation device, comprising a tank body, a conveying assembly is arranged in the tank body, a driving motor is connected to the top of the conveying assembly, the driving motor body is fixedly connected to the top of the tank body, a flow guide assembly is embedded in the top of the conveying assembly, the flow guide assembly is located between the conveying assembly and the driving motor, a feeding pipe is arranged on one side of the top of the tank body, a rotating assembly is clamped at the upper part in the tank body, a driving assembly is connected to the top of the rotating assembly, and the driving assembly is fixedly connected to the outer wall of the tank body through the tank body.

[0008] As a further scheme of the present application: two toothed discs are arranged in the rotating assembly, a connecting shaft is clamped in the middle of the toothed disc, a plurality of stirring mechanisms are arranged outside the connecting shaft, the stirring mechanisms and the stopper are arranged in a staggered manner, the top of the connecting shaft is connected with the sliding block through a shaft sleeve, the stirring mechanism comprises six groups of stirring rods, and the number of stirring rods in each group is three, one end of the stirring rod is hingedly connected with the connecting shaft outside through a pin shaft, a blocking bar is arranged in front of and behind the stirring rod, the blocking bar is fixed with the connecting shaft, one of the blocking bars is overlapped with the stirring rod, and the other end of the stirring rod is provided with a scraping rod.

[0009] As a further scheme of the present application: a sliding rail is arranged in the tank body, the sliding block is slidably connected in the sliding rail, the sliding block is designed in a T shape, and the shape is matched with the shape of the sliding rail.

[0010] As a further scheme of the present application: a cavity is arranged in the tank body, six supporting legs are arranged at the bottom of the tank body, a discharge valve is arranged between the six supporting legs, the discharge valve is communicated with the top of the tank body, the bottom of the tank body is designed in a slope, and an exhaust valve pipe is arranged at the top of the tank body.

[0011] As a further scheme of the present application: the conveying assembly comprises a conveying cylinder, the conveying cylinder is fixedly connected with the inner wall of the tank body through a fixing frame, a spiral rod is connected in the conveying cylinder, the bottom of the spiral rod extends out of the conveying cylinder, four discharge holes are arranged on the upper part of the outer wall of the conveying cylinder, and a plurality of stoppers are fixedly connected outside the conveying cylinder.

[0012] As a further scheme of the present application: the flow guide assembly comprises a flow guide pipe, an input pipe is communicated with the back of the flow guide pipe, a flow valve is arranged outside the input pipe, the flow guide pipe is designed in a ring shape, and four spray pipes are connected to the bottom of the flow guide pipe, the four spray pipes are clamped in and communicated with the inside of the conveying cylinder.

[0013] As a further scheme of the present application: the rotating assembly comprises a bearing, the bearing is clamped in the inner part of the tank body, a gear ring is arranged in the bearing, a group of gear teeth are arranged on the inner wall and top of the gear ring, the number of the gear teeth is several, the inner gear teeth of the gear ring are engaged with two toothed discs, and the gear teeth on the top of the gear ring are engaged with the driving assembly.

[0014] As a further scheme of the present application: the driving assembly comprises a fixing block, a driving motor is clamped on the fixing block, the driving motor is fixedly connected with the side wall of the tank body, a driving gear is fixedly connected with the output shaft of the driving motor, and the driving gear is engaged with the gear teeth on the top of the gear ring.

[0015] A high-efficiency and pollution-free high-purity arsenic preparation method comprises the following steps:

[0016] S1, arsenic raw materials are loaded into the tank body through the feeding pipe, and the raw arsenic is sublimated and condensed under the condition that the vacuum degree is Pa, the sublimation temperature is 400-750 DEG C, and the condensation temperature is 230-380 DEG C, then hydrogen sulfide gas is introduced into the input pipe, and the flow valve is in a closed state at this time;

[0017] S2, after the arsenic raw materials are loaded, the two feeding pipes are closed, the driving motor is controlled to work, the output shaft of the driving motor drives the screw rod to rotate, part of the raw arsenic is concentrated at the bottom of the tank body and contacts the bottom of the screw rod due to the inclined design of the bottom of the tank body, the screw rod can drive the raw arsenic to be upwardly conveyed and simultaneously subjected to preliminary crushing treatment;

[0018] S3, the flow valve is opened at the same time, the hydrogen sulfide gas enters the flow guide pipe and is sprayed out from the four spray pipes at the bottom of the flow guide pipe, when the raw arsenic moves to the position of the discharge hole, the hydrogen sulfide gas sprayed out from the spray pipes directly contacts the raw arsenic, and the raw arsenic can be discharged from the four discharge holes due to the continuous rotation of the screw rod;

[0019] S4, after the raw arsenic is discharged from the discharge hole, the driving motor works synchronously with the driving motor, the driving motor drives the driving gear to rotate, the gear ring can rotate in the bearing due to the mutual engagement of the driving gear and the gear teeth on the top of the gear ring, the inner gear teeth of the gear ring can drive the two toothed discs to rotate, the toothed discs can make circular motion around the inner ring of the gear ring in the process of rotation, the toothed discs drive the plurality of stirring mechanisms to rotate through the connecting shaft, the connecting shaft drives the sliding block to move in the sliding rail through the shaft sleeve, the stirring mechanisms can scatter the raw arsenic discharged from the discharge hole, cooperate with the blocking knives outside the conveying cylinder, and make the stirring mechanisms continuously rotate between the adjacent two blocking knives, so that the crushing effect and mixing effect of the raw arsenic are improved, and the rate of preparing arsenic by using the hydrogen sulfide gas reduction method is accelerated;

[0020] S5, the broken and mixed raw material arsenic can be again concentrated in the tank bottom, the raw material arsenic is transported upwards by the screw rod, and hydrogen sulfide gas is sprayed to the raw material arsenic again, the contact area of hydrogen sulfide gas and raw material arsenic is increased, so the cycle is increased, and the mobility of raw material arsenic in the tank is increased, the reaction is carried out in the same S1 environment, and the sublimation time is 5-8h, the hydrogen sulfide is used to reduce the raw material arsenic trioxide, and hydrogen is used to reduce the polysulfide into elemental arsenic, and the reaction process is as follows:

[0021] As2O3+3H2S→As2S3+3H2O

[0022] As n S m +mH2→nAs +mH2S

[0023] That is, the preparation of high-purity arsenic is completed.

[0024] Compared with the prior art, the beneficial effects of the present application are that:

[0025] 1. In the present application, the raw material arsenic is placed in the tank, the two feeding pipes are closed after the arsenic raw material is filled, the driving motor is controlled to work, the output shaft of the driving motor drives the screw rod to rotate, part of the raw material arsenic is concentrated in the bottom of the tank and contacts the bottom of the screw rod due to the inclined design of the bottom of the tank, the screw rod can transport the raw material arsenic upwards and preliminarily crush the raw material arsenic at the same time, the flow valve is opened at the same time, hydrogen sulfide gas enters the flow guide pipe, and is sprayed from the four spray pipes at the bottom of the flow guide pipe, when the raw material arsenic moves to the position of the discharge hole, the hydrogen sulfide gas sprayed from the spray pipe directly contacts the raw material arsenic, due to the continuous rotation of the screw rod, the raw material arsenic can be discharged from the four discharge holes, the broken and mixed raw material arsenic can be again concentrated in the bottom of the tank, the raw material arsenic is transported upwards by the screw rod, and hydrogen sulfide gas is sprayed to the raw material arsenic again, the contact area of hydrogen sulfide gas and raw material arsenic is increased, so the cycle is increased, and the mobility of raw material arsenic in the tank is increased, the preparation efficiency of high-purity arsenic is improved, and the quality of the product is improved at the same time;

[0026] 2. In the application, the raw material arsenic is conveyed by the conveying cylinder and discharged from the discharge hole, and the driving machine works synchronously with the driving motor. The driving machine drives the driving gear to rotate. Since the driving gear is engaged with the teeth on the top of the gear ring, the gear ring can rotate in the bearing. The teeth inside the gear ring can drive the two tooth plates to rotate. The tooth plates can make circular motion around the inner ring of the gear ring during rotation. The tooth plates drive the plurality of stirring mechanisms to rotate through the connecting shaft. The connecting shaft drives the sliding block to move in the slide rail through the shaft sleeve. The stirring mechanism can scatter the raw material arsenic discharged from the discharge hole. The stirring mechanism is continuously rotated between the adjacent two baffles with the cooperation of the baffles outside the conveying cylinder, which improves the crushing effect and mixing effect of the raw material arsenic, speeds up the preparation of arsenic by hydrogen sulfide gas reduction method, and controls the driving motor to work in reverse during cleaning of the inner wall of the tank body. During the process of making circular motion around the gear ring, the tooth plates can drive the stirring rods to rotate clockwise. The stirring rods can be deflected outside the connecting shaft and contact with one of the baffle strips to achieve the purpose of limiting the stirring rods. The scraper on the stirring rod can contact with the inner wall of the tank body. With the continuous rotation of the connecting shaft, the scraper can scrape the residues on the inner wall of the tank body, which is convenient for cleaning the inner wall of the tank body and prevents the normal reaction from being affected by the long-term attachment of impurities in the tank body. When the connecting shaft rotates in reverse, the stirring rod can contact with the other baffle strip during rotation. The stirring rod rotates around the pin shaft on the connecting shaft. Since the stirring rod is deflected, the scraper can be separated from the inner wall of the tank body, so it will not affect the normal mixing reaction of the material.

[0027] 3. In the application, the connecting shaft is limited by the T-shaped sliding block. The connecting shaft moves in the slide rail through the shaft sleeve. The shaft sleeve can ensure the normal rotation of the connecting shaft, the tooth plate and the stirring mechanism, improve the stability of the device operation, and freely adjust the amount of hydrogen sulfide gas sprayed according to the production needs and the particle size of the raw material arsenic. The effect of the reduction reaction is increased. The setting of the multi-directional spray pipe can ensure that the hydrogen sulfide gas contacts with the raw material arsenic more fully and uniformly, further improving the reaction effect. In the preparation of high-purity arsenic by hydrogen sulfide reduction method, no waste liquid, waste gas and waste are generated during the preparation process, which reduces the harm to the human body and the environment and reduces the safety hidden danger. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a three-dimensional structure schematic diagram of the application;

[0029] Figure 2 It is a sectional structure schematic diagram of the application;

[0030] Figure 3 It is a sectional structure schematic diagram of the conveying assembly of the application;

[0031] Figure 4 It is a structure schematic diagram of the flow guide assembly of the application;

[0032] Figure 5 This is a schematic diagram of the connection between the rotating component and the driving component of the present invention;

[0033] Figure 6 This is a schematic diagram of the cross-sectional structure of the tank body of the present invention;

[0034] Figure 7 For the present invention Figure 2 Enlarged structural diagram at point A;

[0035] Figure 8 This is a schematic diagram of the stirring mechanism of the present invention;

[0036] In the diagram: 1. Tank; 2. Conveying assembly; 201. Conveying cylinder; 202. Screw rod; 203. Fixing frame; 204. Discharge hole; 3. Drive motor; 4. Flow guiding assembly; 401. Flow guiding pipe; 402. Spray pipe; 403. Input pipe; 404. Flow valve; 5. Feed pipe; 6. Rotating assembly; 601. Bearing; 602. Gear ring; 603. Gear teeth; 7. Drive assembly; 701. Fixing block; 702. Drive motor; 703. Drive gear; 8. Connecting shaft; 9. Gear disc; 10. Stirring mechanism; 101. Stirring rod; 102. Baffle; 103. Scraper; 11. Bushing; 12. Sliding block; 13. Slide rail; 14. Cavity; 15. Discharge valve; 16. Support leg; 17. Baffle. Detailed Implementation

[0037] The technical solution of this application will be further described in detail below with reference to specific embodiments.

[0038] like Figures 1-8 As shown, the present invention provides a technical solution: a high-efficiency and pollution-free high-purity arsenic preparation device, including a tank 1, with a cavity 14 inside the tank 1, six support legs 16 at the bottom of the tank 1, and a discharge valve 15 between the six support legs 16. The discharge valve 15 is connected to the top of the tank 1. The bottom of the tank 1 is designed with a slope, and an exhaust valve pipe is provided at the top of the tank 1. Because the bottom of the tank 1 is designed with a slope, some of the raw material arsenic is concentrated at the bottom of the tank 1 and contacts the bottom of the screw rod 202. The screw rod 202 can drive the raw material arsenic to be transported upward, preventing some of the raw material arsenic from accumulating at the bottom of the tank 1 and failing to mix.

[0039] The tank body 1 is provided with a conveying assembly 2, the top of the conveying assembly 2 is connected with a driving motor 3, the conveying assembly 2 comprises a conveying cylinder 201, the conveying cylinder 201 is fixedly connected with the inner wall of the tank body 1 through a fixing frame 203, a spiral rod 202 is connected in the conveying cylinder 201, the bottom of the spiral rod 202 extends out of the conveying cylinder 201, four discharge holes 204 are formed in the upper portion of the outer wall of the conveying cylinder 201, and a plurality of blocking knives 17 are fixedly connected outside the conveying cylinder 201, because the spiral rod 202 is arranged, the spiral rod 202 can drive the raw material arsenic to be upwardly conveyed and simultaneously perform a preliminary crushing treatment on the raw material arsenic, so that the raw material arsenic at the bottom of the tank body 1 can be stacked on the upper layer of raw material arsenic in the tank body 1, the raw material arsenic can be fully mixed in multiple directions, and the reaction effect is improved.

[0040] The body of the driving motor 3 is fixedly connected with the top of the tank body 1, the top of the conveying assembly 2 is embedded with a flow guide assembly 4, the flow guide assembly 4 is located between the conveying assembly 2 and the driving motor 3, the flow guide assembly 4 comprises a flow guide pipe 401, the back surface of the flow guide pipe 401 is communicated with an input pipe 403, the input pipe 403 is externally provided with a flow valve 404, the flow guide pipe 401 is designed in a ring shape and is connected with four spray pipes 402 at the bottom, the four spray pipes 402 are clamped in and communicated with the inside of the conveying cylinder 201, because the flow valve 404 is arranged, the amount of hydrogen sulfide gas sprayed can be freely adjusted according to the production needs and the particle size of the raw material arsenic, the effect of the reduction reaction is increased, and the arrangement of the multiple spray pipes 402 can ensure that the hydrogen sulfide gas and the raw material arsenic are more fully and uniformly contacted, and the reaction effect is further improved.

[0041] High-purity arsenic is prepared by using the hydrogen sulfide reduction method through the input of hydrogen sulfide gas into the input pipe 403, no waste liquid, waste gas and waste are generated in the preparation process, the harm to the human body and the environment is reduced, and the safety hidden danger is reduced.

[0042] A feeding pipe 5 is arranged on one side of the top of the tank body 1, a rotating assembly 6 is clamped in the upper portion of the tank body 1, two toothed discs 9 are arranged in the rotating assembly 6, a connecting shaft 8 is clamped in the middle portion of the toothed disc 9, a plurality of stirring mechanisms 10 are arranged outside the connecting shaft 8, the stirring mechanisms 10 and the blocking knives 17 are arranged in a staggered manner, and the top of the connecting shaft 8 is connected with a sliding block 12 through a shaft sleeve 11.

[0043] The stirring mechanism 10 comprises six groups of stirring rods 101, and the number of stirring rods 101 in each group is three, one end of the stirring rod 101 is hingedly connected with the outside of the connecting shaft 8, a blocking strip 102 is arranged on the front and back of the stirring rod 101, the blocking strip 102 is fixed with the connecting shaft 8, the stirring rod 101 can be kept horizontally swung left and right and is respectively abutted and blocked by two stirring rods 101 left and right, one of the blocking strips 102 is overlapped with the stirring rod 101, the other end of the stirring rod 101 is provided with a scraping rod 103, the scraping rod 103 and the blocking knife 17 are arranged in a staggered manner and will not affect the normal work.

[0044] Initially, a baffle bar abuts against the stirring rod 101. At this time, the length of the stirring rod 101 is equal to the distance from the inner wall of the tank 1 to the connecting shaft 8. The hanging rod 103 at the end of the stirring rod 101 is in contact with the inner wall of the tank (the stirring rod 101 is along the inner diameter of the tank). As... Figure 8 When rotating counterclockwise as shown, the baffle 102 on the right side remains in contact with the stirring rod 101, and the hanging rod 103 at the end of the stirring rod 101 can scrape the inner wall of the tank. When rotating in the opposite direction, the stirring rod 101 swings horizontally in the other direction and is eventually contacted by another baffle 102. At this time, the hanging rod 103 at the end of the stirring rod 101 does not contact the inner wall of the tank and will not affect normal operation.

[0045] When cleaning the inner wall of tank 1, the drive motor 3 is controlled to work in reverse, so that the gear disc 9 can drive several stirring rods 101 to rotate clockwise as it moves in a circular motion around the gear ring 602. The stirring rods 101 can deflect outside the connecting shaft 8 and contact one of the baffles 102, thus limiting the stirring rods 101. Then, during the rotation, the scraper 103 on the stirring rod 101 can contact the inner wall of tank 1. As the connecting shaft 8 continues to rotate, the scraper 103 can scrape the residue on the inner wall of tank 1, which is convenient for cleaning the inner wall of tank 1 and prevents the normal reaction from being affected by impurities that have been attached to the inner wall of tank 1 for a long time. When the connecting shaft 8 rotates in the reverse direction, the stirring rod 101 can contact another baffle 102 during the rotation. The stirring rod 101 rotates around the pin on the connecting shaft 8. Because the stirring rod 101 deflects, the scraper 103 can disengage from the inner wall of tank 1, so as not to affect the normal mixing reaction of materials.

[0046] A slide rail 13 is provided at the top of the tank body 1. A sliding block 12 is slidably connected in the slide rail 13. The sliding block 12 has a T-shaped design and its shape is adapted to the shape of the slide rail 13. The T-shaped sliding block 12 limits the connecting shaft 8. The connecting shaft 8 drives the sliding block 12 to move in the slide rail 13 through the bushing 11. The bushing 11 can ensure the normal rotation of the connecting shaft 8, the toothed disc 9 and the stirring mechanism 10, and improve the stability of the device operation.

[0047] The top of the rotating assembly 6 is connected with a driving assembly 7, the driving assembly 7 is fixedly connected with the outer wall of the tank body 1, the rotating assembly 6 comprises a bearing 601, the bearing 601 is clamped in the tank body 1, the bearing 601 is provided with a gear ring 602 in the inside, the inner wall and the top of the gear ring 602 are provided with a group of gear teeth 603, the number of the gear teeth 603 is several, the inner gear teeth 603 of the gear ring 602 are engaged with two toothed discs 9, the gear teeth 603 on the top of the gear ring 602 are engaged with the driving assembly 7, through the mutual cooperation between the toothed disc 9 and the stirring mechanism 10, the gear ring 602 can rotate in the bearing 601, the inner gear teeth 603 of the gear ring 602 can drive the two toothed discs 9 to rotate, the toothed disc 9 can make the circular motion around the inner circle of the gear ring 602 in the rotating process, then the toothed disc 9 drives the plurality of stirring mechanisms 10 to rotate through the connecting shaft 8, the stirring mechanism 10 can scatter the raw material arsenic discharged from the discharge hole 204, and cooperates with the blocking knives 17 outside the conveying cylinder 201, so that the stirring mechanism 10 continuously rotates between the adjacent two blocking knives 17, and the crushing effect and the mixing effect of the raw material arsenic are improved.

[0048] The driving assembly 7 comprises a fixed block 701, the fixed block 701 is clamped with a driving machine 702, the driving machine 702 is fixedly connected with the side wall of the tank body 1, the output shaft of the driving machine 702 is fixedly connected with a driving gear 703, the driving gear 703 is engaged with the gear teeth 603 on the top of the gear ring 602, because the gear ring 602 is provided, and the top and the inside of the gear ring 602 are provided with the gear teeth 603, the toothed disc 9 and the driving gear 703 can be driven to rotate synchronously, so that the toothed disc 9 can make the circular motion around the inner circle of the gear ring 602 in the rotating process, and the stability of the mixing work of the stirring mechanism 10 is greatly improved.

[0049] A high-efficiency and pollution-free high-purity arsenic preparation method comprises the following steps:

[0050] S1, the arsenic raw material is loaded into the tank body 1 through the feeding pipe 5, and the raw material arsenic is sublimated and condensed in the environment that the vacuum degree is Pa, the sublimation temperature is 400-750 DEG C, and the condensation temperature is 230-380 DEG C, then the hydrogen sulfide gas is introduced into the input pipe 403, and the flow valve 404 is in the closed state;

[0051] S2, when the arsenic raw material is loaded, the two feeding pipes 5 are closed, the driving motor 3 is controlled to work, the output shaft of the driving motor 3 drives the spiral rod 202 to rotate, because the bottom of the tank body 1 is designed as an inclined surface, part of the raw material arsenic is concentrated at the bottom of the tank body 1 and contacts the bottom of the spiral rod 202, the spiral rod 202 can drive the raw material arsenic to be upwardly conveyed and preliminarily crushed;

[0052] S3, the flow valve 404 is opened at the same time, hydrogen sulfide gas enters the flow guide pipe 401, and is sprayed out from the four spray pipes 402 at the bottom of the flow guide pipe 401, when the raw material arsenic moves to the position of the discharge hole 204, the hydrogen sulfide gas sprayed out from the spray pipe 402 directly contacts the raw material arsenic, and due to the continuous rotation of the screw rod 202, the raw material arsenic can be discharged from the four discharge holes 204;

[0053] S4, when the raw material arsenic is discharged from the discharge hole 204, the drive machine 702 works synchronously with the drive motor 3, the drive machine 702 drives the drive gear 703 to rotate, the drive gear 703 is meshed with the teeth 603 at the top of the gear ring 602, so that the gear ring 602 can rotate in the bearing 601, the teeth 603 inside the gear ring 602 can drive the two toothed discs 9 to rotate, the toothed discs 9 can make circular motion around the inner circle of the gear ring 602 in the process of rotation, then the toothed discs 9 drive the plurality of stirring mechanisms 10 to rotate through the connecting shaft 8, the connecting shaft 8 drives the sliding block 12 to move in the sliding rail 13 through the shaft sleeve 11, and the stirring mechanism 10 can scatter the raw material arsenic discharged from the discharge hole 204, cooperate with the blocking knife 17 outside the conveying cylinder 201, so that the stirring mechanism 10 continuously rotates between adjacent two blocking knives 17, improve the crushing effect and mixing effect of the raw material arsenic, and speed up the rate of preparing arsenic by using hydrogen sulfide gas reduction method;

[0054] S5, the crushed and mixed raw material arsenic can be concentrated again at the bottom of the tank body 1, the raw material arsenic is upwardly conveyed by the screw rod 202, and hydrogen sulfide gas is sprayed to the raw material arsenic again, so as to increase the contact area between hydrogen sulfide gas and the raw material arsenic, so as to increase the flowability of the raw material arsenic in the tank body 1, and the reaction is carried out in the same S1 environment, and the sublimation time is 5-8h, the raw material arsenic is reduced by hydrogen sulfide, and the polysulfide is reduced into elemental arsenic by hydrogen, and the reaction process is as follows:

[0055] As2O3+3H2S→As2S3+3H2O

[0056] As n S m +mH2→nAs +mH2S

[0057] That is, the preparation of high-purity arsenic is completed.

[0058] In the description of the present application, it should be pointed out that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] While the preferred embodiments of the application have been described above, it will be recognized and understood that various modifications can be made to the application and the appended claims are intended to cover all such modifications which are within the scope of the application, includinghandicapped individuals.

Claims

1. A highly efficient and pollution-free method for preparing high-purity arsenic, characterized in that, A high-efficiency and pollution-free high-purity arsenic preparation device includes a tank (1), a conveying assembly (2) is provided inside the tank (1), a drive motor (3) is connected to the top of the conveying assembly (2), the body of the drive motor (3) is fixedly connected to the top of the tank (1), a flow guiding assembly (4) is embedded in the top of the conveying assembly (2), the flow guiding assembly (4) is located between the conveying assembly (2) and the drive motor (3), a feed pipe (5) is provided on one side of the top of the tank (1), a rotating assembly (6) is snapped into the upper part of the tank (1), a drive assembly (7) is connected to the top of the rotating assembly (6), and the drive assembly (7) passes through the tank (1) and is fixedly connected to the outer wall of the tank (1); The rotating assembly (6) is provided with two toothed discs (9), and a connecting shaft (8) is snapped into the middle of the toothed discs (9). Several stirring mechanisms (10) are provided outside the connecting shaft (8). The stirring mechanisms (10) and the baffle (17) are arranged in an alternating manner. The top of the connecting shaft (8) is connected to the sliding block (12) through the bushing (11). The stirring mechanism (10) includes six sets of stirring rods (101), and each set of stirring rods (101) has three rods. One end of the stirring rod (101) is hinged to the connecting shaft (8) through a pin. The stirring rod (101) is provided with baffles (102) at both the front and rear. The baffles (102) are fixed to the connecting shaft (8). One baffle (102) overlaps with the stirring rod (101). The other end of the stirring rod (101) is provided with a scraper (103). The top of the tank (1) is provided with a slide rail (13), and the sliding block (12) is slidably connected in the slide rail (13). The sliding block (12) is T-shaped and its shape is adapted to the shape of the slide rail (13). The tank (1) has an internal cavity (14), and the bottom of the tank (1) has six support legs (16). A discharge valve (15) is provided between the six support legs (16). The discharge valve (15) is connected to the top of the tank (1). The bottom of the tank (1) is designed with a slope. The top of the tank (1) has an exhaust valve pipe. The conveying assembly (2) includes a conveying cylinder (201). The conveying cylinder (201) is fixedly connected to the inner wall of the tank (1) through a fixing frame (203). A spiral rod (202) is connected inside the conveying cylinder (201). The bottom of the spiral rod (202) extends out of the conveying cylinder (201). Four discharge holes (204) are opened on the upper part of the outer wall of the conveying cylinder (201). Several baffles (17) are fixedly connected to the outside of the conveying cylinder (201). The flow guiding assembly (4) includes a flow guiding pipe (401), the back of which is connected to an input pipe (403), and a flow valve (404) is installed on the outside of the input pipe (403). The flow guiding pipe (401) is annular and has four nozzles (402) connected to its bottom. The four nozzles (402) are snapped into the inside of the conveying cylinder (201) and communicate with the inside of the conveying cylinder (201). The rotating assembly (6) includes a bearing (601), which is snapped into the inside of the tank (1). A gear ring (602) is provided inside the bearing (601). A set of teeth (603) is provided on the inner wall and top of the gear ring (602). The number of teeth (603) is several. The teeth (603) inside the gear ring (602) mesh with two gear discs (9). The teeth (603) on the top of the gear ring (602) mesh with the drive assembly (7). The drive assembly (7) includes a fixing block (701), on which a drive machine (702) is snapped. The drive machine (702) is fixedly connected to the side wall of the tank (1). The output shaft of the drive machine (702) is fixedly connected to a drive gear (703). The drive gear (703) meshes with the teeth (603) on the top of the gear ring (602). The efficient and pollution-free method for preparing high-purity arsenic includes the following steps: S1. The arsenic raw material is loaded into the tank (1) through the feed pipe (5) and placed under a vacuum of 100°C. In an environment with a sublimation temperature of 400-750℃ and a condensation temperature of 230-380℃, the raw material arsenic is sublimated and condensed, and then hydrogen sulfide gas is introduced into the input pipe (403). At this time, the flow valve (404) is in the closed state. S2. After the arsenic raw material is loaded, the two feed pipes (5) are closed and the drive motor (3) is controlled to work. The output shaft of the drive motor (3) drives the screw rod (202) to rotate. Since the bottom of the tank (1) is designed with a slope, some of the raw arsenic is concentrated at the bottom of the tank (1) and contacts the bottom of the screw rod (202). The screw rod (202) can drive the raw arsenic to be conveyed upward and perform preliminary crushing treatment on the raw arsenic. S3. At the same time, the flow valve (404) is opened, and the hydrogen sulfide gas enters the guide pipe (401) and is sprayed out from the four nozzles (402) at the bottom of the guide pipe (401). When the raw material arsenic moves to the position of the discharge hole (204), the hydrogen sulfide gas sprayed out by the nozzle (402) directly contacts the raw material arsenic. As the screw rod (202) continues to rotate, the raw material arsenic can be discharged from the four discharge holes (204). S4. After the raw material arsenic is discharged from the discharge hole (204), the drive machine (702) works synchronously with the drive motor (3). The drive machine (702) drives the drive gear (703) to rotate. Since the drive gear (703) meshes with the teeth (603) on the top of the gear ring (602), the gear ring (602) can rotate in the bearing (601). The teeth (603) inside the gear ring (602) can drive the two gear discs (9) to rotate. During the rotation, the gear discs (9) can make a circle around the inner ring of the gear ring (602). In the cycle motion, the toothed disc (9) drives multiple stirring mechanisms (10) to rotate through the connecting shaft (8). The connecting shaft (8) then drives the sliding block (12) to move within the slide rail (13) through the bushing (11). The stirring mechanism (10) can break up the raw arsenic discharged from the discharge hole (204). With the help of the baffle (17) outside the conveying cylinder (201), the stirring mechanism (10) rotates continuously between two adjacent baffles (17), improving the crushing and mixing effect of the raw arsenic and accelerating the rate of arsenic preparation by hydrogen sulfide gas reduction method. S5. The crushed and mixed raw arsenic can be concentrated again at the bottom of the tank (1). The raw arsenic is then conveyed upward by the screw (202), and hydrogen sulfide gas is sprayed onto the raw arsenic again to increase the contact area between the hydrogen sulfide gas and the raw arsenic. This cycle is repeated to increase the fluidity of the raw arsenic in the tank (1). The reaction is carried out in the same environment as in S1, and the sublimation time is 5-8 hours. The raw arsenic trioxide is reduced by hydrogen sulfide, and then hydrogen is passed through to reduce the polysulfides to elemental arsenic. The reaction process is as follows: As₂O₃ + 3H₂S → As₂S₃ + ​​3H₂O As n S m +mH2→nAs +mH2S; This completes the preparation of high-purity arsenic.

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