Equipment for preparing elemental arsenic through continuous reduction of arsenic oxide

Abstract

The utility model discloses equipment for preparing elemental arsenic by continuously reducing arsenic oxide, and belongs to the technical field of elemental arsenic preparation equipment. Comprising a supporting frame, a reaction kettle, a first solid-liquid separation tank, a second solid-liquid separation tank, a first three-way pipe and an air heater, filter cartridges are installed in the first solid-liquid separation tank and the second solid-liquid separation tank, and two outlets of the first three-way pipe penetrate through the first solid-liquid separation tank and the second solid-liquid separation tank and are communicated with inner cavities of the filter cartridges; two outlets of the three-way pipe I are respectively provided with two first electromagnetic valves; according to the utility model, the first solid-liquid separation tank, the second solid-liquid separation tank, the three-way pipe I, the hot-air blower, the three-way pipe II, the first electromagnetic valve and the second electromagnetic valve are arranged in a matched manner, so that after the reaction of reaction liquid is finished, the first solid-liquid separation tank and the second solid-liquid separation tank can be used for alternately carrying out solid-liquid separation on the reaction liquid and drying granular arsenic; and continuous alternate solid-liquid separation and granular arsenic drying of the reaction liquid are ensured, and the preparation efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of elemental arsenic preparation equipment, in particular to equipment for preparing elemental arsenic by continuous reduction of arsenic oxide. Background Art

[0002] Many arsenic compounds are deadly toxic and are often added to herbicides, rodenticides, etc. As a conductor of electricity, it is used in semiconductors. Compounds are generally called arsenides and are often used in the production of paints, wallpapers and pottery.

[0003] A Chinese invention with publication number CN110777260B discloses a wet treatment process for preparing elemental arsenic, which describes a method in which arsenic oxide undergoes multiple reduction reactions in a reactor to produce a reaction liquid, which is then dried after solid-liquid separation to obtain elemental arsenic. A Chinese utility model with publication number CN208574631U discloses a continuous solid-liquid separation reactor, in which, during production, as a solid product is produced, a first discharge valve is opened, a solid-liquid mixture enters a separation tank, and after being filtered through a filter screen, the solid product remains in the filter screen, and a filtrate containing the raw material flows out from a liquid outlet of the separation tank shell, is pressurized by a booster pump, and is returned to the reactor to continue to participate in the reaction, and this process is repeated until the reactants react completely. After the reaction is completed, the second discharge valve is closed, the first discharge valve is opened, and the waste liquid is discharged from the first discharge pipe. The solid product can be directly taken out from the filter screen and dried through subsequent processes.

[0004] Although the reactor in Public Document 2 can meet the requirements for a reactor in Public Document 1, the solid-liquid separation of the reaction liquid by filtering through a single filter cartridge not only has a slow solid-liquid separation efficiency, but also requires drying of the elemental arsenic after the filter cartridge is removed to complete the extraction of the elemental arsenic, resulting in a low preparation efficiency. Utility Model Content

[0005] The purpose of the utility model is to solve the problem that in the prior art, a reactor performs solid-liquid separation on a reaction liquid by filtering with a single filter cartridge, which not only has a slow solid-liquid separation efficiency, but also requires drying the elemental arsenic after the filter cartridge is removed to complete the extraction of the elemental arsenic, resulting in low preparation efficiency. A device is proposed to prepare elemental arsenic by continuous reduction of arsenic oxide.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A device for preparing elemental arsenic by continuous reduction of arsenic oxide, comprising a reaction kettle, a first solid-liquid separation tank, a second solid-liquid separation tank, a three-way pipe and a hot air blower;

[0008] The reactor is fixedly mounted on the support frame and is used for secondary reduction of arsenic oxide to produce a reaction solution containing elemental arsenic;

[0009] The first solid-liquid separation tank and the second solid-liquid separation tank are respectively fixedly arranged on both sides of the support frame, and filter cartridges are installed inside the first solid-liquid separation tank and the second solid-liquid separation tank. The bottom of the filter cartridge is fixedly connected with a discharge pipe, and the discharge pipe is provided with a sealing plug. The bottom end of the discharge pipe passes through the solid-liquid separation tank and extends to the outside of the first solid-liquid separation tank and the second solid-liquid separation tank. The bottoms of the first solid-liquid separation tank and the second solid-liquid separation tank are both fixedly connected with a discharge pipe;

[0010] The water inlet of the three-way pipe 1 is connected to the liquid discharge port at the bottom of the reactor, and the two outlets of the three-way pipe 1 pass through the first solid-liquid separation tank and the second solid-liquid separation tank and are connected to the inner cavity of the filter cartridge. Two first solenoid valves are respectively installed at the two outlets of the three-way pipe 1, and the first solid-liquid separation tank and the second solid-liquid separation tank are cyclically supplied with liquid through the two first solenoid valves being cyclically opened and closed;

[0011] A three-way pipe 2 is installed at the output end of the hot air blower, and the two outlets of the three-way pipe 2 are fixedly connected to the first solid-liquid separation tank and the second solid-liquid separation tank respectively. Two second solenoid valves are installed at the two outlets of the three-way pipe 2 respectively, and the hot air blower circulates hot air to the first solid-liquid separation tank and the second solid-liquid separation tank through the cyclic opening and closing of the three-way pipe 2 and the two second solenoid valves.

[0012] Preferably, the filter cartridge is rotatably arranged inside the first solid-liquid separation tank and the second solid-liquid separation tank, respectively, and the discharge pipe is rotatably sealed with the first solid-liquid separation tank and the second solid-liquid separation tank, a second motor is installed on the bottom surface of the first solid-liquid separation tank and the second solid-liquid separation tank, and the output shaft of the second motor and the bottom of the discharge pipe are fixedly sleeved with pulleys, and the two pulleys are connected by belt drive.

[0013] Preferably, a scraper is fixedly connected to the inner top wall of the first solid-liquid separation tank and the second solid-liquid separation tank, and the scraper is in contact with the inner wall of the filter cartridge.

[0014] Preferably, the reaction kettle comprises a kettle body fixedly connected to a support frame, a heating jacket is installed on the kettle body, and an addition pipe is fixedly connected to the kettle body.

[0015] Preferably, a measuring instrument is installed on the kettle body, and a detection end of the measuring instrument is located inside the kettle body.

[0016] Preferably, a bearing sealing seat is installed on the kettle body, a first motor is fixedly installed on the bearing sealing seat, and an output shaft of the first motor passes through the bearing sealing seat and the kettle body in sequence and is installed with a stirring shaft.

[0017] Compared with the prior art, the utility model provides a device for preparing elemental arsenic by continuous reduction of arsenic oxide, which has the following beneficial effects.

[0018] 1. The utility model coordinates the first solid-liquid separation tank, the second solid-liquid separation tank, the first three-way pipe, the hot air blower, the second three-way pipe, the first solenoid valve and the second solenoid valve. After the reaction of the reaction liquid is completed, the first solid-liquid separation tank and the second solid-liquid separation tank can alternately perform solid-liquid separation on the reaction liquid and dry the arsenic particles, thereby ensuring continuous alternating solid-liquid separation and drying of the arsenic particles, and achieving high preparation efficiency.

[0019] 2. Through the coordinated design of the second motor, the scraper, the pulley and the belt, the discharge pipe and the filter cartridge can be driven to rotate in the first solid-liquid separation tank and the second solid-liquid separation tank. When the output shaft of the second motor drives the discharge pipe to rotate through the belt and the pulley, the filter cartridge in the rotating state will always be in contact with the scraper, so that the scraper can scrape and remove the elemental arsenic attached to the inner wall of the filter cartridge, reduce the residual elemental arsenic in the separation barrel, and also make the drying effect of the elemental arsenic in the filter cartridge better. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional diagram of the utility model.

[0021] Figure 2 It is a cross-sectional view of the utility model.

[0022] Figure 3 It is a schematic structural diagram of the solid-liquid separation tank of the utility model in a cutaway state.

[0023] In the figure:

[0024] 1. Two-way pipe; 2. Hot air blower; 3. Second motor; 4. Kettle body; 5. Heating jacket; 6. Adding pipe; 7. Measuring instrument; 8. Bearing seal seat; 9. First motor; 10. Stirring shaft; 11. One-way pipe; 12. Drain pipe; 13. First solid-liquid separation tank; 14. Second solid-liquid separation tank; 15. Filter cartridge; 16. Scraper; 17. Discharge pipe. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0026] Reference Figure 1-3, an apparatus for preparing elemental arsenic by continuous reduction of arsenic oxide, comprising a support frame, a reactor, a first solid-liquid separation tank 13, a second solid-liquid separation tank 14, a three-way pipe 11 and a hot air blower 2, wherein the reactor is fixedly arranged on the support frame, the reactor comprises a kettle body 4 fixedly connected to the support frame, a heating jacket 5 is installed on the kettle body 4, an addition pipe 6 is fixedly connected to the kettle body 4, the heating jacket 5 is an existing structure, since arsenic oxide requires a certain temperature support during the reaction process, the heating jacket 5 can heat the reaction liquid in the kettle body 4, the heating jacket 5 can be heated by an internal circulation method of conveying hot water or an internal electric heating plate, and is used for the secondary reduction reaction of arsenic oxide to produce a reaction liquid containing elemental arsenic.

[0027] A bearing sealing seat 8 is installed on the kettle body 4. The bearing sealing seat 8 is a bearing seat. A first motor 9 is fixedly connected to the bearing sealing seat 8. The output shaft of the first motor 9 passes through the bearing sealing seat 8 and the kettle body 4 in sequence and is installed with a stirring shaft 10. The bearing sealing seat 8 is used to improve the sealing performance of the connection between the output shaft of the first motor 9 and the kettle body 4. The stirring shaft 10 is driven to rotate by the output shaft of the first motor 9, which can improve the reaction efficiency of arsenic oxide and the reducing product. A measuring instrument 7 is installed on the kettle body 4, and the detection end of the measuring instrument 7 is located in the kettle body 4. The measuring instrument 7 is an existing structure, and there are a temperature detection module and a pH detection module inside it. The measuring instrument 7 can detect the temperature and pH of the solution in the kettle body 4 in real time.

[0028] The first solid-liquid separation tank 13 and the second solid-liquid separation tank 14 are fixedly arranged on both sides of the support frame respectively. Filter cartridges 15 are installed inside the first solid-liquid separation tank 13 and the second solid-liquid separation tank 14. The top and bottom of the filter cartridge 15 are open, and the bottom of the filter cartridge 15 is funnel-shaped. The filter cartridge 15 is the existing technology, and support rings are arranged on the top and bottom thereof. The two support rings are connected to each other by reinforcing ribs. The filter screen is surrounded by a frame formed by the support rings and the reinforcing ribs to form a cylindrical filter screen.

[0029] The top support ring of the filter cartridge 15 is rotatably connected to the first solid-liquid separation tank 13 and the second solid-liquid separation tank 14, so that the filter cartridge 15 is rotatably arranged inside the first solid-liquid separation tank 13 and the second solid-liquid separation tank 14 respectively, and the filter cartridge 15 can complete the separation of elemental arsenic in the reaction liquid.

[0030] The bottom of the filter cartridge 15 is fixedly connected to a discharge pipe 17. Specifically, the discharge pipe 17 is fixed on a steel ring at the bottom of the filter cartridge 15. The bottom end of the discharge pipe 17 passes through the first solid-liquid separation tank 13 and the second solid-liquid separation tank 14 and extends to the outside of the first solid-liquid separation tank 13 and the second solid-liquid separation tank 14. The discharge pipe 17 is rotatably sealed with the first solid-liquid separation tank 13 and the second solid-liquid separation tank 14, so that the elemental arsenic collected in the first solid-liquid separation tank 13 and the second solid-liquid separation tank 14 can be discharged from the discharge pipe 17.

[0031] The discharge pipe 17 is provided with a sealing plug. The sealing plug can completely block the discharge pipe 17 when the discharge pipe 17 is not in the discharge state, so that the reaction liquid entering the first solid-liquid separation tank 13 and the second solid-liquid separation tank 14 will not enter the interior of the discharge pipe 17 before being filtered and dried. The bottom surfaces of the first solid-liquid separation tank 13 and the second solid-liquid separation tank 14 are installed with a second motor 3. The output shaft of the second motor 3 and the bottom of the discharge pipe 17 are fixedly sleeved with pulleys, and the two pulleys are connected by belt drive. Through the coordinated design of the second motor 3, the pulley and the belt, the discharge pipe 17 and the filter cartridge 15 can be driven to rotate in the first solid-liquid separation tank 13 and the second solid-liquid separation tank 14.

[0032] The water inlet of the three-way pipe 11 is connected with the liquid discharge port at the bottom of the reactor, and the two outlets of the three-way pipe 11 pass through the first solid-liquid separation tank 13 and the second solid-liquid separation tank 14 and are connected with the inner cavity of the filter cartridge 15. Two first solenoid valves are respectively installed at the two outlets of the three-way pipe 11, and the first solid-liquid separation tank 13 and the second solid-liquid separation tank 14 are circulatedly supplied with liquid through the cyclic opening and closing of the two first solenoid valves.

[0033] The bottoms of the first solid-liquid separation tank 13 and the second solid-liquid separation tank 14 are fixedly connected with a drain pipe 12, which is used to discharge the solution after the reaction, and the drain pipe 12 is in a continuous discharge state when the reaction liquid is undergoing solid-liquid separation. Specifically, when the reaction of the reaction liquid in the reactor is completed, the first solenoid valve corresponding to the first solid-liquid separation tank 13 is opened to allow the reaction liquid to flow into the corresponding filter cartridge 15, and the arsenic particles in the reaction liquid are intercepted in the filter cartridge 15, while the reaction liquid flows out of the filter cartridge 15 and is discharged from the drain pipe 12. After the first solid-liquid separation tank 13 has been filtered for a period of time, a certain amount of particulate arsenic exists in the filter cartridge 15, the corresponding first solenoid valve is closed and the first solenoid valve corresponding to the second solid-liquid separation tank 14 is opened, and the solid-liquid separation operation is performed through the second solid-liquid separation tank 14.

[0034] A three-way pipe 21 is installed at the output end of the hot air blower 2, and the two outlets of the three-way pipe 21 are fixedly connected to the first solid-liquid separation tank 13 and the second solid-liquid separation tank 14 respectively. Two second solenoid valves are installed at the two outlets of the three-way pipe 21 respectively, and the hot air blower 2 circulates hot air to the first solid-liquid separation tank 13 and the second solid-liquid separation tank 14 through the cyclic opening and closing of the three-way pipe 21 and the two second solenoid valves.

[0035] When the second solid-liquid separation tank 14 replaces the first solid-liquid separation tank 13 to perform solid-liquid separation operations, particulate arsenic is stored in the filter cartridge 15 inside the first solid-liquid separation tank 13 after fixed separation. Opening the second solenoid valve corresponding to the first solid-liquid separation tank 13 can enable the hot air blower 2 to dry the particulate arsenic in the rotating filter cartridge 15 in the first solid-liquid separation tank 13. After drying, the sealing plug is pulled out to collect the arsenic, and then the second solid-liquid separation tank 14 is repeatedly dried. This cycle ensures continuous solid-liquid separation and drying operations on arsenic, improves efficiency, and the drain pipe 12 also serves to discharge heat-dissipated air when in the drying state.

[0036] The inner top walls of the first solid-liquid separation tank 13 and the second solid-liquid separation tank 14 are fixedly connected with a scraper 16, and the scraper 16 is in contact with the inner wall of the filter cartridge 15. When the output shaft of the second motor 3 drives the discharge pipe 17 to rotate through the belt and the pulley, the filter cartridge 15 in the rotating state will always be in contact with the scraper 16, so that the scraper 16 can scrape and remove the elemental arsenic attached to the inner wall of the filter cartridge 15, thereby reducing the elemental arsenic remaining in the first solid-liquid separation tank 13 and the second solid-liquid separation tank 14, and also making the drying effect of the elemental arsenic in the filter cartridge 15 better.

[0037] Working principle: First, pour arsenic oxide into the kettle body 4 through the addition tube 6, and add sulfur dioxide into the kettle body 4 through the addition tube 6 according to a certain proportion, then start the first motor 9, so that the output shaft of the first motor 9 drives the stirring shaft 10 to rotate, which can improve the reaction efficiency of arsenic oxide and the reducing agent. After 2 hours, the pH value and temperature of the solution in the kettle body 4 are detected by the measuring instrument 7, and sulfuric acid is added into the kettle body 4 through the addition tube 6, and the pH value of the solvent in the kettle body 4 is controlled. Subsequently, the solvent in the kettle body 4 is heated by the heating jacket 5, and a certain proportion of aluminum powder is added through the addition tube 6, so that the stirring shaft 10 continues to stir the solvent for 2 hours to produce a reaction liquid, and finally, the reaction liquid is transported to the first solid-liquid separation tank 13 through the three-way pipe 11.

[0038] At this time, the corresponding second motor 3 is started, so that the output shaft of the second motor 3 drives the discharge pipe 17 to rotate through the belt and the pulley. Under the action of centrifugal force, the reaction liquid passes through the filter cartridge 15 for solid-liquid separation. When rotating in the first solid-liquid separation tank 13, the scraper 16 can scrape the inner wall of the filter cartridge 15 to prevent the filtered elemental arsenic from adhering to the inner wall of the filter cartridge 15 for a long time.

[0039] Then, by opening the corresponding first solenoid valve, the reaction liquid is transported to the second solid-liquid separation tank 14 through the three-way pipe 11. At this time, particulate arsenic exists in the filter cartridge 15 inside the first solid-liquid separation tank 13. The corresponding second solenoid valve is opened to allow the hot air blower 2 to dry the particulate arsenic in the rotating filter cartridge 15 in the first solid-liquid separation tank 13. After drying, the sealing plug is pulled out to collect the arsenic, and then the second solid-liquid separation tank 14 is repeatedly dried. This cycle is repeated, and the first solid-liquid separation tank 13 and the second solid-liquid separation tank 14 are alternately solid-liquid separated and dried to ensure continuous solid-liquid separation and drying of the arsenic.

Claims

1. An apparatus for preparing elemental arsenic by continuous reduction of arsenic oxide, characterized in that: It comprises a reaction kettle, a first solid-liquid separation tank (13), a second solid-liquid separation tank (14), a three-way pipe (11) and a hot air blower (2); the reaction kettle is fixedly arranged on a support frame and is used for performing a secondary reduction reaction on arsenic oxide to produce a reaction liquid containing elemental arsenic; The first solid-liquid separation tank (13) and the second solid-liquid separation tank (14) are fixedly arranged on both sides of the support frame, respectively; filter cartridges (15) are installed inside the first solid-liquid separation tank (13) and the second solid-liquid separation tank (14); the bottom of the filter cartridge (15) is fixedly connected to a discharge pipe (17); the discharge pipe (17) is provided with a sealing plug; the bottom end of the discharge pipe (17) passes through the solid-liquid separation tank (13) and extends to the outside of the first solid-liquid separation tank (13) and the second solid-liquid separation tank (14); the bottoms of the first solid-liquid separation tank (13) and the second solid-liquid separation tank (14) are both fixedly connected to a discharge pipe (12); The water inlet of the three-way pipe (11) is connected to the liquid discharge port at the bottom of the reactor, and the two outlets of the three-way pipe (11) penetrate the first solid-liquid separation tank (13) and the second solid-liquid separation tank (14) and are connected to the inner cavity of the filter cartridge (15). Two first solenoid valves are respectively installed at the two outlets of the three-way pipe (11), and the first solid-liquid separation tank (13) and the second solid-liquid separation tank (14) are cyclically opened and closed to perform liquid supply to the first solid-liquid separation tank (13) and the second solid-liquid separation tank (14); The output end of the hot air blower (2) is provided with a three-way pipe (2) and the two outlets of the three-way pipe (2) are respectively fixedly connected to the first solid-liquid separation tank (13) and the second solid-liquid separation tank (14). Two second solenoid valves are respectively installed at the two outlets of the three-way pipe (2) and the two second solenoid valves. The hot air blower (2) circulates hot air to the first solid-liquid separation tank (13) and the second solid-liquid separation tank (14) through the cyclic opening and closing of the three-way pipe (2) and the two second solenoid valves.

2. The device for preparing elemental arsenic by continuous reduction of arsenic oxide according to claim 1, characterized in that: The filter cartridge (15) is rotatably arranged inside the first solid-liquid separation tank (13) and the second solid-liquid separation tank (14), respectively, and the discharge pipe (17) is rotatably sealed with the first solid-liquid separation tank (13) and the second solid-liquid separation tank (14). A second motor (3) is installed on the bottom surface of the first solid-liquid separation tank (13) and the second solid-liquid separation tank (14), and the output shaft of the second motor (3) and the bottom of the discharge pipe (17) are both fixedly sleeved with pulleys, and the two pulleys are connected by belt transmission.

3. The device for preparing elemental arsenic by continuous reduction of arsenic oxide according to claim 2, characterized in that: A scraper (16) is fixedly connected to the inner top walls of the first solid-liquid separation tank (13) and the second solid-liquid separation tank (14), and the scraper (16) is in contact with the inner wall of the filter cartridge (15).

4. The device for preparing elemental arsenic by continuous reduction of arsenic oxide according to claim 3, characterized in that: The reaction kettle comprises a kettle body (4) fixedly connected to a support frame, a heating jacket (5) is installed on the kettle body (4), and an addition pipe (6) is fixedly connected to the kettle body (4).

5. The device for preparing elemental arsenic by continuous reduction of arsenic oxide according to claim 4, characterized in that: A measuring instrument (7) is installed on the kettle body (4), and a detection end of the measuring instrument (7) is located inside the kettle body (4).

6. The device for preparing elemental arsenic by continuous reduction of arsenic oxide according to claim 4, characterized in that: A bearing seal seat (8) is installed on the kettle body (4), a first motor (9) is fixedly installed on the bearing seal seat (8), and an output shaft of the first motor (9) passes through the bearing seal seat (8) and the kettle body (4) in sequence and is installed with a stirring shaft (10).

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