Device for producing tellurium powder by using tellurium dioxide

Abstract

The utility model relates to a device for producing tellurium powder by using tellurium dioxide, and belongs to the technical field of tellurium powder production equipment. Comprising a leaching kettle, a plate-and-frame filter press, a primary reduction kettle, a primary reduction filter barrel, a secondary reduction kettle, a secondary reduction filter barrel and a waste liquid tank which are sequentially connected, materials in the leaching kettle are conveyed into the plate-and-frame filter press through a first conveying pump, and the leaching kettle is further connected with a hydrochloric acid storage tank through a pipeline; the opening of the primary reduction kettle is positioned right above the primary reduction filter barrel, and the primary reduction kettle is also connected with a sulfur dioxide steel cylinder; materials in the primary reduction filter barrel are conveyed into a secondary reduction kettle through a second conveying pump; an outlet of the secondary reduction kettle is positioned right above the secondary reduction filter barrel, and the secondary reduction kettle is also connected with a sulfur dioxide steel cylinder; materials of the secondary reduction filter barrel are input into the waste liquid tank through a third conveying pump; the tellurium dioxide is produced by adopting the method, the technological operation is simple, the production efficiency is high, the tellurium content of the liquid after secondary reduction is low, the liquid can be reused in a leaching kettle, and the use amount of hydrochloric acid is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of tellurium powder production equipment, and in particular to an apparatus for producing tellurium powder using tellurium dioxide. Background Technology

[0002] Tellurium, as the rare dispersed element with the best metallic properties among nonmetallic elements, has two allotropes: amorphous tellurium, which is a black powder, and crystalline tellurium, which has a silvery-white orthorhombic crystal system. Although tellurium has a very low average abundance in the Earth's crust (6 × 10⁻⁵), its excellent metallic properties have led to its widespread application in metallurgy, medicine, petrochemicals, electronics, glass and ceramics, aerospace, and other fields. In recent years, tellurium consumption has shown a growing trend, and its applications are shifting from traditional metallurgy and petrochemicals to emerging fields such as solar energy, semiconductors, and infrared detection. Tellurium is destined to become one of the most important strategic resources.

[0003] Currently, industrially produced tellurium mainly comes from the anode mud of copper electrolytic refining, with a content typically ranging from 2% to 10%. Smaller amounts originate from alkaline slag produced during lead refining, tellurium-bismuth-gold ore, sludge from sulfuric acid plants, and dust from sulfuric acid plants and smelters. Tellurium dioxide is an important intermediate product obtained from tellurium-containing materials through pyrometallurgical and hydrometallurgical processes. The traditional method for producing tellurium from tellurium dioxide is electrowinning, but this process has a cycle exceeding 10 days, involves high labor intensity for workers handling the electrowinning process, and results in extremely low tellurium production efficiency, making it difficult to achieve rapid extraction and production of tellurium from tellurium dioxide. Utility Model Content

[0004] To solve or partially solve the problems existing in related technologies, this utility model provides an apparatus for producing tellurium powder using tellurium dioxide, and provides a new apparatus for producing tellurium.

[0005] The above-mentioned apparatus for producing tellurium powder using tellurium dioxide includes a leaching kettle 1, a plate and frame filter press 2, a primary reduction kettle 3, a primary reduction filter barrel 4, a secondary reduction kettle 5, a secondary reduction filter barrel 6, and a waste liquid tank 7, which are connected in sequence by pipelines.

[0006] A first conveying pump 101 is installed on the connecting pipe between the discharge port of the leaching kettle 1 and the feed port of the plate and frame filter press 2, and the leaching kettle 1 is also connected to the hydrochloric acid storage tank 9 through a pipe.

[0007] The lower outlet of the primary reduction reactor 3 is located directly above the primary reduction filter barrel 4. The primary reduction reactor 3 is also connected to the outlet of the sulfur dioxide cylinder 10 via a pipe.

[0008] A second conveying pump 401 is provided on the connecting pipe between the bottom outlet of the primary reduction filter 4 and the top inlet of the secondary reduction reactor 5.

[0009] The lower outlet of the secondary reduction reactor 5 is located directly above the secondary reduction filter barrel. The secondary reduction reactor 5 is also connected to the sulfur dioxide cylinder 10 via a pipe.

[0010] A third conveying pump 601 is provided on the connecting pipe between the bottom outlet of the secondary reduction filter 6 and the top inlet of the waste liquid tank 7.

[0011] The bottom outlet of the waste liquid tank 7 is also connected to the inlet of the fourth transfer pump 701 via a pipe, and the outlet of the fourth transfer pump 701 is connected to the inlet of the leaching tank 1 via a pipe.

[0012] In some schemes, a radar wave level gauge 11 is installed on the outside of the leaching tank 1, the primary reduction tank 3, the secondary reduction tank 5, and the waste liquid tank 7, and the radar wave level gauge 11 is connected to the signal input terminal of the controller.

[0013] Each of the primary reduction filter tank 4 and the secondary reduction filter tank 6 is equipped with a float-type level gauge; the float-type level gauge is connected to the signal input terminal of the controller;

[0014] The signal output terminal of the controller is connected to the fourth delivery pump 701, the first delivery pump 101, the second delivery pump 401, and the third delivery pump 601, respectively.

[0015] In some embodiments, a platinum group thermometer 13 is installed inside the leaching vessel 1, the primary reduction vessel 3, and the secondary reduction vessel 5;

[0016] The platinum group thermometer 13 is connected to the signal input terminal of the controller, and the signal output terminal of the controller is connected to the first valve on the steam pipe of the leaching vessel 1, the second valve on the steam pipe of the primary reduction vessel 3, and the third valve on the steam pipe of the secondary reduction vessel 5.

[0017] In some schemes, the top of the leaching tank 1, the primary reduction tank 3, and the secondary reduction tank 5 are respectively provided with a waste gas outlet, which is connected to the alkaline desulfurization system.

[0018] In some embodiments, the outlet of the fourth transfer pump 701 is equipped with a three-way valve, with one outlet end discharging to the wastewater treatment system and the other outlet end connected to the feed inlet of the leaching tank 1.

[0019] In some embodiments, the primary reduction filter 4 is also connected to a vacuum pump 8 via a pipe.

[0020] The technical solution provided by this utility model can include the following beneficial effects:

[0021] The production of tellurium dioxide using this application is simple to operate, has high production efficiency, and produces low tellurium content in the liquid after secondary reduction, which can be reused in the leaching reactor, thus reducing the amount of hydrochloric acid used.

[0022] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the present invention. Attached Figure Description

[0023] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally represent like parts.

[0024] Figure 1 This is a schematic diagram of the pipeline of the apparatus for producing tellurium powder according to an embodiment of the present invention;

[0025] Figure label:

[0026] 1. Leaching vessel; 101. First transfer pump; 2. Plate and frame filter press; 3. Primary reduction vessel; 4. Primary reduction filter barrel; 401. Secondary transfer pump; 5. Secondary reduction vessel; 6. Secondary reduction filter barrel; 601. Third transfer pump; 7. Waste liquid tank; 701. Fourth transfer pump; 8. Vacuum pump; 9. Hydrochloric acid storage tank; 10. Sulfur dioxide cylinder; 11. Radar wave level gauge; 12. Exhaust gas outlet; 13. Platinum group thermometer. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited to the content described.

[0028] Please see Figure 1This application provides an apparatus for producing tellurium powder from tellurium dioxide, comprising a leaching kettle 1, a plate and frame filter press 2, a primary reduction kettle 3, a primary reduction filter barrel 4, a secondary reduction kettle 5, a secondary reduction filter barrel 6, and a waste liquid tank 7 connected in sequence by pipelines; a first conveying pump 101 is installed on the connecting pipeline between the discharge port of the leaching kettle 1 and the inlet of the plate and frame filter press 2, and the leaching kettle 1 is also connected to a hydrochloric acid storage tank 9 via a pipeline; the lower outlet of the primary reduction kettle 3 is located directly above the primary reduction filter barrel 4, and the primary reduction kettle 3 is also connected to the outlet of a sulfur dioxide cylinder 10 via a pipeline; the bottom outlet of the primary reduction filter barrel 4... A second conveying pump 401 is installed on the connecting pipe to the top inlet of the secondary reduction reactor 5. The primary reduction filter 4 is also connected to the vacuum pump 8 via a pipe. The lower outlet of the secondary reduction reactor 5 is located directly above the secondary reduction filter. The secondary reduction reactor 5 is also connected to the sulfur dioxide cylinder 10 via a pipe. A third conveying pump 601 is installed on the connecting pipe between the bottom outlet of the secondary reduction filter 6 and the top inlet of the waste liquid tank 7. The bottom outlet of the waste liquid tank 7 is also connected to the inlet of the fourth conveying pump 701 via a pipe. The outlet of the fourth conveying pump 701 is connected to the inlet of the leaching reactor 1 via a pipe.

[0029] The specific operating steps for producing tellurium powder are as follows:

[0030] Tellurium dioxide powder and concentrated hydrochloric acid are added to leaching vessel 1 at a liquid-to-solid ratio of 2-4:1, and stirring is started. Then, steam is turned on to heat the material to 60-90℃. After leaching for 1-2 hours, tellurium dioxide reacts with hydrochloric acid to generate tellurium tetrachloride solution. After leaching, sodium sulfide is added as a purification agent and stirred for 30-60 minutes to remove impurities such as copper, lead, and arsenic. Then, sulfur dioxide is introduced for 1-5 minutes to remove selenium impurities. After purification, the solution is transported to plate and frame filter press 2 by the first transfer pump 101 for solid-liquid separation. The leaching residue obtained after separation is bagged and stored, and the leachate enters the primary reduction vessel 3. The stirring and steam in the primary reduction vessel 3 are turned on to heat the leachate in the primary reduction vessel 3 to 60-90℃, and then... After adding sulfur dioxide for 4-8 hours, when no obvious black precipitate is found after adding sodium sulfite during the reduction process, the material in the primary reduction reactor 3 is placed into the primary reduction filter tank 4 for filtration. The filter residue is the primary tellurium powder. The liquid after the primary reduction is transported to the secondary reduction reactor 5 through the second transfer pump 501. The stirring and steam in the secondary reduction reactor 5 are turned on, and the leaching liquid in the secondary reduction reactor 5 is heated to 60-90℃. Then, sulfur dioxide is introduced or iron powder is added, and the reaction is continued for 1-4 hours. When no obvious black precipitate is found after adding sodium sulfite during the reduction process, the material in the secondary reduction reactor 5 is placed into the secondary reduction filter tank 6 for filtration again. The filter residue is the secondary tellurium powder. The liquid after the secondary reduction is transported to the waste liquid tank 7 for storage through the third transfer pump 601.

[0031] The hydrochloric acid in the waste tank 7 is pumped back to the leaching tank 1 by the fourth transfer pump 701 for reuse, which effectively reduces the use of hydrochloric acid.

[0032] In this embodiment, the first delivery pump 101, the second delivery pump 501, the third delivery pump 601, and the fourth delivery pump 701 are all engineering plastic pumps, and all of them can be remotely started and stopped. The pipes are all made of PE.

[0033] In this embodiment, a radar level gauge 11 is installed on the outside of the leaching tank 1, the primary reduction tank 3, the secondary reduction tank 5, and the waste liquid tank 7, and the radar level gauge 11 is connected to the signal input terminal of the controller; a float level gauge is installed inside the primary reduction filter tank 4 and the secondary reduction filter tank 6, and the float level gauge is connected to the signal input terminal of the controller;

[0034] The signal output terminal of the controller is connected to the fourth delivery pump 701, the first delivery pump 101, the second delivery pump 401, and the third delivery pump 601, respectively.

[0035] During operation, each radar level gauge 11 and float level gauge detects the liquid level in the leaching tank 1, primary reduction tank 3, secondary reduction tank 5, waste liquid tank 7, primary reduction filter 4, and secondary reduction filter 6, and transmits the relevant data to the controller. The controller controls the start and stop of the fourth transfer pump 701, the first transfer pump 101, the second transfer pump 401, and the third transfer pump 601 according to the input signal, so as to realize the automated control of the leaching tank 1, primary reduction tank 3, secondary reduction tank 5, waste liquid tank, primary reduction filter 4, and secondary reduction filter 6 in the device, which helps to reduce the labor intensity and improve the automation level of the device.

[0036] In this embodiment, platinum group thermometers 13 are installed inside the leaching tank 1, the primary reduction tank 3, and the secondary reduction tank 5. The platinum group thermometers 13 are connected to the signal input terminal of the controller, and the signal output terminal of the controller is connected to the first valve on the steam pipe of the leaching tank 1, the second valve on the steam pipe of the primary reduction tank 3, and the third valve on the steam pipe of the secondary reduction tank 5, respectively.

[0037] During operation, each platinum group thermometer transmits the temperature of leaching tank 1, primary reduction tank 3, and secondary reduction tank 5 to the controller. The controller adjusts the opening of the corresponding valves according to the input signal, thereby achieving automatic temperature control within leaching tank 1, primary reduction tank 3, and secondary reduction tank 5.

[0038] In this embodiment, the top of the leaching tank 1, the primary reduction tank 3, the secondary reduction tank 5, and the decomposition reaction tank are all equipped with exhaust gas outlets 12, which are connected to the alkaline desulfurization system. This effectively reduces the emission of exhaust gas and thus reduces air pollution.

[0039] In this embodiment, the outlet of the fourth delivery pump 701 is equipped with a three-way valve, one end of which discharges to the wastewater treatment system, and the other end is connected to the feed inlet of the leaching tank 1.

[0040] In this embodiment, the primary reduction filter 4 is also connected to the vacuum pump 8 via a pipe. Specifically, the suction end of the vacuum pump 8 is connected to the bottom cavity of the primary reduction filter 4 via a pipe, that is, to the cavity below the filter plate of the primary reduction filter 4. Thus, when the primary reduction filter 4 filters materials, the filtration efficiency of the primary reduction filter 4 can be accelerated by turning on the vacuum pump 8.

[0041] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. An apparatus for producing tellurium powder from tellurium dioxide, characterized by: The device comprises a leaching kettle (1), a plate and frame filter press (2), a first reduction kettle (3), a first reduction filter bucket (4), a second reduction kettle (5), a second reduction filter bucket (6), and a waste liquid tank (7) connected in sequence through pipelines. A first conveying pump (101) is arranged on the connecting pipeline between the discharge port of the leaching kettle (1) and the feed port of the plate and frame filter press (2), and the leaching kettle (1) is further connected with a hydrochloric acid storage tank (9) through a pipeline. The lower end outlet of the first reduction kettle (3) is located directly above the first reduction filter bucket (4), and the first reduction kettle (3) is further connected with the gas outlet of a sulfur dioxide steel cylinder (10) through a pipeline. A second conveying pump (401) is arranged on the connecting pipeline between the bottom outlet of the first reduction filter bucket (4) and the top feed port of the second reduction kettle (5). The lower end outlet of the second reduction kettle (5) is located directly above the second reduction filter bucket, and the second reduction kettle (5) is further connected with the sulfur dioxide steel cylinder (10) through a pipeline. A third conveying pump (601) is arranged on the connecting pipeline between the bottom outlet of the second reduction filter bucket (6) and the top feed port of the waste liquid tank (7). The bottom outlet of the waste liquid tank (7) is further connected with the feed port of a fourth conveying pump (701) through a pipeline, and the discharge port of the fourth conveying pump (701) is connected with the feed port of the leaching kettle (1) through a pipeline.

2. The device for producing tellurium powder from tellurium dioxide according to claim 1, characterized in that: A radar wave liquid level meter (11) is arranged outside the leaching kettle (1), the first reduction kettle (3), the second reduction kettle (5), and the waste liquid tank (7) respectively, and the radar wave liquid level meter (11) is connected with the signal input end of a controller; A float ball type liquid level meter is arranged in the first reduction filter bucket (4) and the second reduction filter bucket (6) respectively, and the float ball type liquid level meter is connected with the signal input end of the controller; The signal output end of the controller is connected with the fourth conveying pump (701), the first conveying pump (101), the second conveying pump (401), and the third conveying pump (601) respectively.

3. The device for producing tellurium powder from tellurium dioxide according to claim 2, characterized in that: A platinum group thermometer (13) is arranged inside the leaching kettle (1), the first reduction kettle (3), and the second reduction kettle (5); The platinum group thermometer (13) is connected with the signal input end of the controller, and the signal output end of the controller is connected with a first valve arranged on the steam pipeline of the leaching kettle (1), a second valve arranged on the steam pipeline of the first reduction kettle (3), and a third valve arranged on the steam pipeline of the second reduction kettle (5).

4. The device for producing tellurium powder from tellurium dioxide according to claim 1, characterized in that: An exhaust gas discharge port is arranged on the top of the leaching kettle (1), the first reduction kettle (3), and the second reduction kettle (5) respectively, and the exhaust gas discharge port is connected with an alkali desulfurization system.

5. The device for producing tellurium powder from tellurium dioxide according to claim 1, characterized in that: The fourth delivery pump (701) outlet is provided with a three-way valve, one outlet end is connected to the wastewater treatment system, and the other outlet end is connected to the feed inlet of the leaching kettle (1).

6. The device for producing tellurium powder from tellurium dioxide according to claim 1, characterized in that: The primary reduction filter bucket (4) is also connected to a vacuum pump (8) through a pipeline.

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