A reaction kettle for improving tellurium leaching rate

Abstract

The utility model discloses a kind of reaction kettle of improving tellurium leaching rate, including kettle body, the bottom of kettle body is provided with support, material frame is installed in the inner chamber of kettle body, flange is installed at the top of kettle body by screw rod, the center of flange is installed with the stirring paddle extending into material frame, the top of stirring paddle penetrates flange;Oxygen nozzle is installed on one side of stirring paddle, oxygen nozzle is gradually reduced to form throat pipe with top air inlet downwards, and Venturi tube is gradually expanded in lower portion of throat pipe;Flange is installed with pressure relief pipeline, and pressure relief valve is installed on the outer outlet of pressure relief pipeline.In the utility model, oxygen nozzle is designed into Venturi tube, so that oxygen is continuously accelerated in nozzle, finally enters into reaction cavity, and accelerated oxygen can penetrate liquid film boundary layer on the surface of mineral particle, effectively overcome mass transfer resistance;Under same oxygen partial pressure, the leaching rate of tellurium, gold, silver and other metals can be improved by 5%-15%, reaction time is shortened by 20%, especially suitable for refractory mineral.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical equipment technology, specifically to a reaction vessel for improving tellurium leaching rate. Background Technology

[0002] Tellurium, an important rare and dispersed element, has wide applications in semiconductor materials, such as thermoelectric materials, solar thin films, and infrared detectors. However, independent tellurium deposits are extremely rare and difficult to obtain; it is mostly found as an associated element in metal deposits such as copper, lead, and zinc. The tellurium content in the anode slime produced during copper electrolytic refining is considerable. As an indispensable raw material for the development of high-tech industries and cutting-edge technologies, the efficient separation of tellurium from copper anode slime has become a research focus in the field of hydrometallurgy.

[0003] Tellurium in copper anode slime mainly exists in the form of compounds such as Ag₂Te, Au₂Te, and Cu₂Te. Currently, major smelters have proposed different recovery processes based on the differences in raw materials. The mainstream recovery processes include roasting, leaching, separation, extraction, and refining. Among these, leaching is a crucial step in tellurium extraction, and the leaching rate directly affects the final tellurium recovery rate. Oxygen-pressure acid leaching, as a low-reagent, environmentally friendly, and efficient process, is more effective at leaching tellurium from anode slime due to the higher oxygen solubility in the solution. The oxygen-pressure leaching unit, as the core equipment of the oxygen-pressure acid leaching process, is a key link in the extraction of tellurium from anode slime. However, conventional oxygen-pressure leaching units use ordinary stainless steel round pipes for the oxygen inlet. When the temperature is too high during leaching, the oxygen dissolution capacity of the liquid phase is limited by temperature and pressure. Once the inlet velocity exceeds the saturation value, excess oxygen escapes, and the leaching rate no longer significantly increases, or even wastes gas. Utility Model Content

[0004] The purpose of this invention is to provide a reactor that improves tellurium leaching rate. By setting a venturi tube as an oxygen nozzle, the oxygen intake rate in the reactor is increased, the gas-liquid contact area (such as the number of bubbles) is increased, and mass transfer is enhanced, thereby accelerating the reaction and improving the tellurium leaching rate.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A reactor for improving tellurium leaching rate includes a vessel body, a support at the bottom of the vessel body, a material frame installed in the inner cavity of the vessel body, and a flange installed at the top of the vessel body via a screw. A stirring paddle extending into the material frame is installed at the center of the flange, with the top of the stirring paddle penetrating the flange. An oxygen nozzle is installed on one side of the stirring paddle. The oxygen nozzle is a Venturi tube with a top air inlet that gradually narrows downwards to form a throat and then gradually widens at the bottom. A pressure relief pipe is installed on the flange, and a pressure relief valve is installed at the outer outlet of the pressure relief pipe.

[0006] Preferably, a cooling pipe is installed in the middle of the flange, the lower part of the cooling pipe extends to the material frame, and the top end of the cooling pipe is connected to a cooling circulation system located outside the vessel body.

[0007] Preferably, the top of the oxygen nozzle is threadedly connected to a flange, the oxygen nozzle is detachable, and the air inlet of the oxygen nozzle is connected to an oxygen cylinder located outside the vessel body.

[0008] Preferably, a thermocouple is installed on the flange.

[0009] Preferably, the top side of the material frame is positioned between the flange and the vessel body, and a sealing ring is provided at the connection between the flange and the material frame, with the sealing ring placed in a groove on the upper surface of the side of the material frame.

[0010] Preferably, a heating coil is installed on the inner wall of the vessel.

[0011] In use, this invention involves placing materials such as anode mud, leaching agent, and oxidant into a material frame, which is then placed inside the reactor. A flange is installed on the reactor body via screws. Oxygen at a certain pressure is introduced into the oxygen nozzle, where it is accelerated to supersonic speeds in the Venturi tube's contraction-expansion structure. This significantly increases the oxygen's kinetic energy, and the high-speed airflow creates strong turbulence within the reactor cavity. The oxygen can penetrate the liquid film boundary layer on the surface of mineral particles, effectively overcoming mass transfer resistance. The oxygen breaks down into fine bubbles, increasing the specific surface area by more than 30% compared to conventional nozzles. This greatly improves the gas-liquid-solid three-phase contact efficiency, directly promoting the oxygen pressure acid leaching reaction rate of the anode mud.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: In this invention, the oxygen nozzle is designed as a Venturi tube, which allows the oxygen to be continuously accelerated in the oxygen nozzle and eventually enter the reaction chamber. The accelerated oxygen can penetrate the liquid film boundary layer on the surface of mineral particles, effectively overcoming mass transfer resistance. Under the same oxygen partial pressure, the leaching rate of metals such as tellurium, gold, and silver can be increased by 5%-15%, and the reaction time can be shortened by 20%, making it particularly suitable for difficult-to-process minerals.

[0013] In this invention, the flange is installed on top of the reactor body via several screws, while the material frame is securely installed between the flange and the reactor body. A sealing ring is installed at the connection between the flange and the material frame, which improves the pressure requirements of the reactor and ensures the reliability of the equipment. Furthermore, the material frame can be easily removed from the reactor body after the reaction is complete, facilitating the handling of the leached reactants.

[0014] This utility model relates to a cooling pipe that is installed and connected to a circulating cooling system for controlling the temperature of the leachate.

[0015] The present invention features a heating coil installed on the inner wall of the reactor body, which facilitates the control of the reaction temperature. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the disassembly structure of the parts of this utility model; Figure 2 This is a schematic diagram of the overall structure of this utility model; In the diagram: 1. Flange, 2. Oxygen nozzle, 3. Cooling pipe, 4. Pressure relief pipe, 5. Thermocouple, 6. Agitator, 7. Material frame, 8. Reactor body, 9. Support, 10. Sealing ring, 11. Heating coil. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings.

[0018] like Figure 1 , Figure 2 The reactor shown is for improving tellurium leaching rate. It includes a reactor body 8, a support 9 at the bottom of the reactor body 8, a material frame 7 installed in the inner cavity of the reactor body 8, a flange 1 installed at the top of the reactor body 8 by a screw, a stirring paddle 6 extending into the material frame 7 installed at the center of the flange 1, and the top of the stirring paddle 6 penetrating the flange 1; an oxygen nozzle 2 is installed on one side of the stirring paddle 6, the oxygen nozzle 2 is a venturi tube with the top air inlet gradually narrowing downward to form a throat, and the lower part of the throat gradually widening; a pressure relief pipe 4 is installed on the flange 1, and a pressure relief valve is installed at the outer outlet of the pressure relief pipe 4.

[0019] A cooling pipe 3 is installed in the middle of the flange 1. The lower part of the cooling pipe 3 extends into the material frame 7, and the top of the cooling pipe 3 is connected to a cooling circulation system located outside the vessel body 8.

[0020] The top of the oxygen nozzle 2 is threaded to the flange 1. The oxygen nozzle 2 is detachable. The air inlet of the oxygen nozzle 2 is connected to an oxygen cylinder placed outside the vessel body 8.

[0021] A thermocouple 5 is installed on flange 1.

[0022] The top side of the material frame 7 is placed between the flange 1 and the connection surface of the vessel body 8. A sealing ring 10 is provided at the connection between the flange 1 and the material frame 7. The sealing ring 10 is placed in the groove opened on the upper surface of the side of the material frame 7.

[0023] A heating coil 11 is installed on the inner wall of the vessel body 8.

[0024] In use, the anode mud, leaching agent, oxidant, and other materials are placed in the material frame 7, and then the material frame 7 is placed inside the reactor body 8. The flange 1 is installed on the reactor body 8 by screws. After oxygen with a certain pressure is introduced into the oxygen nozzle 2, the oxygen is accelerated to supersonic speed in the Venturi tube converging-expanding structure, and the kinetic energy of the oxygen is significantly increased. The high-speed airflow forms strong turbulence in the reactor cavity. The oxygen can penetrate the liquid film boundary layer on the surface of mineral particles, effectively overcoming mass transfer resistance. The oxygen is broken into fine bubbles, and the specific surface area is increased by more than 30% compared with conventional nozzles. The gas-liquid-solid three-phase contact efficiency is greatly improved, which directly promotes the oxygen pressure acid leaching reaction rate of the anode mud.

[0025] Using the reaction vessel described in this utility model, copper anode mud produced in the copper electrolysis workshop of a copper smelting enterprise was used as raw material, sulfuric acid was used as leaching agent, the acidity was 120 g / L, the liquid-solid ratio was 4:1, the oxygen pressure was 1.0 MPa, the reaction temperature was 150℃, and the reaction time was 120 min. The results showed that the leaching rate of tellurium was 70%, and there was no loss of other metals.

[0026] Using a conventional oxygen pressure leaching reactor, with copper anode mud produced in the copper electrolysis workshop of a copper smelting enterprise as raw material, sulfuric acid as leaching agent, acidity of 120 g / L, liquid-solid ratio of 4:1, oxygen pressure of 1.0 MPa, reaction temperature of 150℃, and reaction time of 120 min, the results showed that the leaching rate of tellurium was only 55%, with no loss of other metals.

[0027] A comparison of the two embodiments shows that, under the same leaching process parameters, the tellurium leaching rate using this invention is higher. Compared to the unimproved reactor apparatus, the present invention improves the tellurium leaching rate by 30% through improvements to the oxygen nozzle device.

[0028] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, other equivalent modifications and improvements can be made under the technical guidance provided by this utility model, and these should also be considered within the scope of protection of this utility model.

Claims

1. A reactor for improving tellurium leaching rate, comprising a reactor body (8), a support (9) provided at the bottom of the reactor body (8), a material frame (7) installed in the inner cavity of the reactor body (8), and a flange (1) installed at the top of the reactor body (8) by a screw, characterized in that: A stirring paddle (6) extending into the material frame (7) is installed at the center of the flange (1), and the top of the stirring paddle (6) penetrates the flange (1); an oxygen nozzle (2) is installed on one side of the stirring paddle (6), and the oxygen nozzle (2) is a venturi tube that gradually narrows downward from the top air inlet to form a throat, and gradually widens at the bottom of the throat; a pressure relief pipe (4) is installed on the flange (1), and a pressure relief valve is installed at the outer outlet of the pressure relief pipe (4).

2. The reactor for improving tellurium leaching rate according to claim 1, characterized in that: A cooling pipe (3) is installed in the middle of the flange (1), the lower part of the cooling pipe (3) extends into the material frame (7), and the top of the cooling pipe (3) is connected to a cooling circulation system placed outside the vessel body (8).

3. The reactor for improving tellurium leaching rate according to claim 1, characterized in that: The top of the oxygen nozzle (2) is threadedly connected to the flange (1). The oxygen nozzle (2) is detachable. The air inlet of the oxygen nozzle (2) is connected to an oxygen cylinder placed outside the vessel body (8).

4. The reactor for improving tellurium leaching rate according to claim 1, characterized in that: A thermocouple (5) is installed on the flange (1).

5. The reactor for improving tellurium leaching rate according to claim 1, characterized in that: The top side of the material frame (7) is placed between the flange (1) and the vessel body (8) and a sealing ring (10) is provided at the connection between the flange (1) and the material frame (7). The sealing ring (10) is placed in the groove opened on the upper surface of the side of the material frame (7).

6. The reactor for improving tellurium leaching rate according to claim 1, characterized in that: A heating coil (11) is installed on the inner wall of the vessel body (8).

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