Acid liquor leaching device for bismuth processing

By using jet and exhaust mechanisms in the acid liquid leaching device for bismuth processing, the pressure imbalance caused by heat accumulation during bismuth processing is solved, and the stability and operation safety of the reaction process are achieved.

CN119876599APending Publication Date: 2025-04-25GUIXI SANYUAN METALS CO LTD
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Patent Information

Application Number
CN202510148122.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-11
Publication Date
2025-04-25

AI Technical Summary

Technical Problem

During bismuth processing, due to chemical properties, a large amount of heat will be generated, resulting in an imbalance between the internal pressure of the reactor and the external pressure, which poses a risk of frying the furnace.

Method used

A bismuth-processed acid liquid leaching device is designed, including a reactor, a hydraulic cylinder, a jet mechanism and an exhaust mechanism. The cooling gas is injected through the jet mechanism, and the motor drives the rotating assembly to move, so that the cooling gas is evenly injected into the reactor, reducing heat accumulation; at the same time, the exhaust mechanism filters and purifies the toxic gas to ensure safe discharge of the gas.

Benefits of technology

It effectively avoids heat accumulation in the reactor, stabilizes the reaction process, prevents abnormal reactions caused by overheating, and ensures safe operation by purifying the gas.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the field of chemical material processing, in particular to an acid liquor leaching device for bismuth processing, which comprises a reaction kettle, two first hydraulic cylinders are mounted at the left part of the reaction kettle, a lifting plate is connected between telescopic ends of the first hydraulic cylinders, a cover plate is rotatably connected to the right part of the lifting plate, and a driving motor is mounted in the middle of the cover plate; a mounting plate is mounted at the upper part in the reaction kettle, a rotating assembly is rotationally arranged on the mounting plate, the top of the rotating assembly is clamped with the driving motor, an air injection mechanism is arranged between the mounting plate and the rotating assembly, and an exhaust mechanism is arranged on the cover plate. Cooling gas is injected into the rotating assembly through the gas injection mechanism, meanwhile, the driving motor is started, and the driving motor drives the rotating assembly to move, so that the cooling gas can be uniformly injected into the reaction kettle, a large amount of heat generated in the reaction process is avoided, the reaction tends to be stable, and reaction abnormity caused by overheating is avoided.
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Description

Technical Field

[0001] The invention relates to the field of chemical material processing, and in particular to an acid solution leaching device for bismuth processing. Background Art

[0002] In bismuth processing, leaching is an important step in the metal extraction process. It uses acid to dissolve the target metal components in the mineral, thereby separating them from other insoluble impurities. In the specific operation process, it is generally carried out in a specific reactor, and constant stirring is carried out to allow the materials to be fully mixed and reacted. However, when the bismuth is reacted and processed, a large amount of heat will be generated due to chemical properties. All of this heat is gathered in the reactor. If the corresponding treatment is not carried out in time, the internal pressure value of the reactor will be unbalanced with the external pressure value, resulting in the risk of furnace explosion.

[0003] Therefore, a kind of acid solution leaching device of bismuth processing is now developed for the problems referred to above. Summary of the invention

[0004] In order to overcome the disadvantage that when the existing device performs reaction processing on bismuth, a large amount of heat will be generated due to chemical properties, and all of this heat will be gathered in the reactor. If the corresponding treatment is not carried out in time, the internal pressure value and the external pressure value of the reactor will be unbalanced, thereby causing the risk of furnace explosion, the present invention provides an acid leaching device for bismuth processing.

[0005] The technical solution of the present invention is: an acid leaching device for bismuth processing, comprising:

[0006] Reactor;

[0007] A first hydraulic cylinder, wherein the first hydraulic cylinder is mounted on the reactor, and the telescopic ends of the first hydraulic cylinder are both arranged to face upward;

[0008] A lifting plate connected between the telescopic ends of the first hydraulic cylinder;

[0009] A cover plate, the cover plate is rotatably connected to the lifting plate, and the cover plate is used to perform a sealing and protective operation on the reactor;

[0010] A driving motor, wherein the driving motor is mounted on the cover plate;

[0011] A mounting plate, the mounting plate being mounted in the reactor;

[0012] A rotating assembly, the rotating assembly is rotatably disposed on the mounting plate, and the top of the rotating assembly is engaged with the driving motor;

[0013] An air jet mechanism, which is arranged between the mounting plate and the rotating assembly and is used for cooling down in advance to prevent the temperature from being too high;

[0014] An exhaust mechanism is arranged on the cover plate and is used for filtering the toxic gas generated after the reaction.

[0015] Preferably, the rotating assembly includes an air inlet frame and an air outlet, the air inlet frame is rotatably connected to the mounting plate, the top of the air inlet frame is clamped with the drive motor, and the air outlet is provided on the air inlet frame.

[0016] Preferably, the jet mechanism includes an air inlet pipe, which is arranged at the front side of the reactor and is through-connected to the reactor. A heat pipe is installed at the rear of the air inlet pipe. Two liquid inlet pipes are arranged on the heat pipe and are through-connected to the reactor. A mounting frame is connected to the rear end of the air inlet pipe, the mounting frame is connected to the mounting plate, and the mounting frame is rotatably connected to the rotating assembly.

[0017] Preferably, the exhaust mechanism includes a second hydraulic cylinder, which is installed on the upper left side of the cover plate, and the telescopic end of the second hydraulic cylinder is set to face upward. The exhaust component is connected to the telescopic end of the second hydraulic cylinder, and the exhaust component is used to discharge the gas after adsorption treatment. The grille plate is installed at the bottom of the cover plate, and the grille plate is used to perform preliminary filtration on the gas. The adsorption plate is connected to the bottom of the exhaust component, and the adsorption plate is used to adsorb and guide the gas.

[0018] Preferably, a spraying mechanism is further included, which includes a water inlet pipe, which is installed on the upper part of the reactor, and the water inlet pipe and the reactor are in a through-type connection structure. A liquid separation frame is connected to the rear end of the water inlet pipe, and the liquid separation frame is connected to the mounting plate. Four nozzles are installed at the bottom of the mounting plate, and the nozzles are connected to the liquid separation frame.

[0019] Preferably, a stirring and cleaning mechanism is also included, which includes a mounting frame, the mounting frame is mounted on the mounting frame, the planetary gear set is arranged in the mounting frame, the outer gear of the planetary gear set is mounted on the mounting frame, the core gear in the middle of the planetary gear set is mounted on the rotating assembly, and the rotating frame is mounted on the gear ring in the planetary gear set.

[0020] Preferably, a clamping mechanism is also included, which includes a third hydraulic cylinder, which is installed on the right side of the reactor, the telescopic end of the third hydraulic cylinder is set upward, the lifting member is connected to the telescopic end of the third hydraulic cylinder, the fixed seat is set on the upper side of the right side of the reactor, and the fixed seat is rotatably connected with a pressure plate for clamping and limiting the cover plate.

[0021] Preferably, a supporting mechanism is further included, the supporting mechanism includes a fixing frame, the fixing frame is connected to the front and rear sides of the lifting plate, the fixing plates are both connected to the fixing frame, and the fixing plates are used to push and support the cover plate.

[0022] Preferably, the rotating frame is in a U-shaped structure as a whole, which is used to scrape and clean the inner wall of the reactor and to stir the reactor during the reaction.

[0023] Preferably, the pressing plate is through-connected to the lifting member.

[0024] By adopting the above technical solution, the beneficial effects of the present invention are:

[0025] 1. The present invention injects cooling gas into the rotating component through the jet mechanism and starts the driving motor at the same time. The driving motor drives the rotating component to move, so that the cooling gas can be evenly injected into the reactor, avoiding the generation of a large amount of heat during the reaction, so that the reaction can be stabilized, avoiding overheating and causing abnormal reactions, and relying on the exhaust mechanism to filter and purify the toxic gas generated by the reaction, so that the gas can be safely discharged.

[0026] 2. In the present invention, as the rotating assembly starts to rotate, the core gear in the middle of the planetary gear set will start to rotate, thereby causing the gears installed on the mounting frame to rotate synchronously, and then causing the gear ring to rotate. The rotation of the gear ring will drive the rotating frame to rotate, scrape and clean the inner wall of the reactor, and stir the reactor during the reaction process to avoid material residue on the inner wall of the reactor, further improve the reaction efficiency, and allow the materials to react in a mixed manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0028] Figure 2 It is a partial cross-sectional three-dimensional structural schematic diagram of the present invention.

[0029] Figure 3 It is a schematic diagram of a first partial cross-sectional stereoscopic structure of the jet mechanism of the present invention.

[0030] Figure 4 It is a schematic diagram of a second partial cross-sectional three-dimensional structure of the jet mechanism of the present invention.

[0031] Figure 5 It is a schematic diagram of the three-dimensional structure of the exhaust mechanism of the present invention.

[0032] Figure 6 It is a partial cross-sectional three-dimensional structural schematic diagram of the exhaust mechanism of the present invention.

[0033] Figure 7 It is a partial cross-sectional three-dimensional structural schematic diagram of the spraying mechanism of the present invention.

[0034] Figure 8 It is a partial cross-sectional three-dimensional structural schematic diagram of the stirring and cleaning mechanism of the present invention.

[0035] Fig. 9 It is a partial cross-sectional three-dimensional structural schematic diagram of the clamping mechanism of the present invention.

[0036] Fig.10 It is a schematic diagram of the three-dimensional structure of the support mechanism of the present invention.

[0037] Explanation of the accompanying drawings: 1_reactor, 2_lifting plate, 3_first hydraulic cylinder, 4_cover plate, 5_drive motor, 6_mounting plate, 7_rotating assembly, 71_air inlet frame, 72_air outlet, 8_jet mechanism, 81_air inlet pipe, 82_heat conduction pipe, 83_liquid inlet pipe, 84_mounting frame, 9_exhaust mechanism, 91_second hydraulic cylinder, 92_exhaust assembly, 93_grid plate, 94_adsorption plate, 10_spraying mechanism, 101_water inlet pipe, 102_liquid separation frame, 103_spray head, 11_stirring and cleaning mechanism, 111_mounting frame, 112_planetary gear set, 113_rotating frame, 12_pressing mechanism, 121_third hydraulic cylinder, 122_lifting member, 123_pressing plate, 124_fixed seat, 13_support mechanism, 131_fixed frame, 132_fixed plate. DETAILED DESCRIPTION

[0038] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0039] Example 1

[0040] An acid leaching device for bismuth processing, such as Figure 1 and Figure 2As shown, it includes a reactor 1, two first hydraulic cylinders 3 are installed on the left side of the reactor 1, and the telescopic ends of the first hydraulic cylinders 3 are all set to face upward. A lifting plate 2 is connected between the telescopic ends of the first hydraulic cylinders 3, and a cover plate 4 is rotatably connected to the right side of the lifting plate 2. The cover plate 4 is used to seal and protect the reactor 1. A driving motor 5 is installed in the middle of the cover plate 4. A mounting plate 6 is installed on the upper part of the reactor 1. A rotating assembly 7 is rotatably arranged on the mounting plate 6. The rotating assembly 7 includes an air inlet frame 71 and an air outlet 72. The air inlet frame 71 is rotatably connected to the mounting plate 6. The top of the air inlet frame 71 is clamped with the driving motor 5. The air inlet frame 71 is provided with an air outlet 72. The top of the rotating assembly 7 is clamped with the driving motor 5. It also includes: an injection mechanism 8, a jet mechanism 8 is provided between the mounting plate 6 and the rotating assembly 7, and the jet mechanism 8 is used to cool down in advance to prevent the temperature from being too high; an exhaust mechanism 9, which is arranged on the cover plate 4 and is used to filter the toxic gas generated after the reaction.

[0041] It should be noted that the acid leaching device in bismuth processing generally refers to a device used to extract metallic bismuth from minerals. Leaching is an important step in the metal extraction process. It uses acid to dissolve the target metal component in the mineral, thereby separating it from other insoluble impurities. In the specific operation process, the device can be used to perform processing operations. First, the material is injected into the reactor 1, and then the cooling gas is injected into the rotating component 7 through the jet mechanism 8. At the same time, the drive motor 5 is started. The drive motor 5 will drive the rotating component 7 to move, so that the cooling gas can be evenly injected into the reactor 1, avoiding the generation of a large amount of heat during the reaction process, so that the reaction can be stabilized, and overheating can be avoided to cause abnormal reactions. The exhaust mechanism 9 is used to filter and purify the toxic gas generated by the reaction, so that the gas can be safely discharged. After the processing is completed, the acid and solid materials in the reactor 1 are precipitated and taken out, and then the telescopic end of the first hydraulic cylinder 3 is controlled to move upward, so that the lifting plate 2 drives the cover plate 4 to move upward. At this time, the drive motor 5 is disengaged from the rotating component 7, and finally the cover plate 4 is flipped upward to open, which is convenient for the operator to quickly clean it.

[0042] like Figure 1 , Figure 3 and Figure 4 As shown, the jet mechanism 8 includes an air inlet pipe 81, the air inlet pipe 81 is arranged on the front side of the reactor 1, the air inlet pipe 81 is connected to the reactor 1 in a through-type manner, a heat conduction pipe 82 is installed at the rear of the air inlet pipe 81, two liquid inlet pipes 83 are arranged on the heat conduction pipe 82, the liquid inlet pipes 83 are both connected to the reactor 1 in a through-type manner, a mounting frame 84 is connected to the rear end of the air inlet pipe 81, the mounting frame 84 is connected to the mounting plate 6, and the mounting frame 84 is rotatably connected to the rotating component 7.

[0043] It should be noted that when the reaction is being processed, the coolant is first introduced into the heat transfer tube 82 through the liquid inlet pipe 83, and then the gas is introduced through the air inlet pipe 81. The gas is cooled down by the coolant and then enters the rotating assembly 7. The gas after entering the rotating assembly 7 will be discharged through the air outlet 72, thereby cooling the interior of the reactor 1, causing the internal temperature of the reactor 1 to begin to decrease, thereby reducing the heat generated during the reaction process.

[0044] like Figure 1 , Figure 5 and Figure 6 As shown, the exhaust mechanism 9 includes a second hydraulic cylinder 91, which is installed on the upper left side of the cover plate 4, and the telescopic end of the second hydraulic cylinder 91 is set to face upward. An exhaust component 92 is connected to the telescopic end of the second hydraulic cylinder 91, and the exhaust component 92 is used to discharge the gas after adsorption treatment. A grille plate 93 is installed at the bottom of the cover plate 4, and the grille plate is used to perform preliminary filtering on the gas. An adsorption plate 94 is connected to the bottom of the exhaust component 92, and the adsorption plate 94 is used to adsorb and guide the gas.

[0045] It should be noted that when performing exhaust treatment, the gas is initially filtered by relying on the grid plate 93, and then under the action of the adsorption plate 94, the gas will pass through the adsorption plate 94 into the exhaust component 92. At this time, the gas will be adsorbed and filtered, so that the toxic substances remain on the adsorption plate 94, and then the gas will be discharged by the exhaust component 92 to avoid the direct discharge of toxic gases and the impact on the environment and operators.

[0046] Example 2

[0047] On the basis of Example 1, Figure 1 and Figure 7 As shown, a spraying mechanism 10 is also included, and the spraying mechanism 10 includes a water inlet pipe 101. The water inlet pipe 101 is installed on the upper part of the reactor 1. The water inlet pipe 101 and the reactor 1 are in a through-type connection structure. The rear end of the water inlet pipe 101 is connected to a liquid separation frame 102, and the liquid separation frame 102 is connected to the mounting plate 6. Four nozzles 103 are installed at the bottom of the mounting plate 6, and the nozzles 103 are connected to the liquid separation frame 102.

[0048] It should be noted that after the reaction is completed, in order to improve the cleaning efficiency, water can be introduced into the liquid separation frame 102 through the water inlet pipe 101, and then the water is sent to the nozzle 103 by relying on the liquid separation frame 102, so as to achieve comprehensive spray cleaning of the interior of the reactor 1, thereby achieving the effect of improving the cleaning efficiency.

[0049] like Figure 2 and Figure 8As shown, it also includes a stirring and cleaning mechanism 11, which includes a mounting frame 111. The mounting frame 111 is mounted on the mounting frame 84. A planetary gear set 112 is arranged in the mounting frame 111. The outer gears of the planetary gear set 112 are mounted on the mounting frame 111. The core gear in the middle of the planetary gear set 112 is mounted on the rotating component 7. A rotating frame 113 is mounted on the gear ring in the planetary gear set 112. The rotating frame 113 has a U-shaped structure as a whole, which is used to scrape and clean the inner wall of the reactor 1 and stir the reactor 1 during the reaction process.

[0050] It should be noted that as the rotating component 7 starts to rotate, the core gear in the middle of the planetary gear set 112 will start to rotate, so that the gear installed on the mounting frame 111 will rotate synchronously, and then the gear ring will rotate. The rotation of the gear ring will drive the rotating frame 113 to rotate, scrape and clean the inner wall of the reactor 1, and stir the reaction during the reaction process to avoid material residue on the inner wall of the reactor 1, and further improve the reaction efficiency, so that the materials can be mixed and reacted.

[0051] like Figure 1 and Fig. 9 As shown, it also includes a clamping mechanism 12, which includes a third hydraulic cylinder 121. The third hydraulic cylinder 121 is installed on the right side of the reactor 1, and the telescopic end of the third hydraulic cylinder 121 is set to face upward. A lifting member 122 is connected to the telescopic end of the third hydraulic cylinder 121. A fixed seat 124 is provided on the upper side of the right side of the reactor 1, and a pressing plate 123 for clamping and limiting the cover plate 4 is rotatably connected to the fixed seat 124. The pressing plate 123 is through-connected with the lifting member 122.

[0052] It should be noted that in order to further improve the compression and sealing of the cover plate 4, the pressure plate 123 is relied on to compress and limit the cover plate 4. When the cover plate 4 needs to be opened, it is first necessary to control the telescopic end of the third hydraulic cylinder 121 to move upward, so that the telescopic end of the third hydraulic cylinder 121 drives the lifting member 122 to move upward. At this time, the lifting member 122 will push the pressure plate 123 to flip upward, so that the pressure plate 123 no longer compresses and limits the cover plate 4, and the locked state of the cover plate 4 is released.

[0053] like Figure 1 and Fig.10 As shown, a support mechanism 13 is also included, and the support mechanism 13 includes a fixing frame 131. The front and rear sides of the lifting plate 2 are connected to the fixing frame 131, and the fixing frame 131 is connected to a fixing plate 132. The fixing plate 132 is used to push and support the cover plate 4.

[0054] It should be noted that when the lifting plate 2 is pushed and starts to move upward, the lifting plate 2 will drive the fixing frame 131 to move upward, thereby causing the fixing plate 132 to move upward synchronously. During the upward movement of the fixing plate 132, a pushing force will be applied to the cover plate 4 to avoid the problem that the cover plate 4 is too heavy and cannot be lifted normally.

[0055] The above description is only an example of the present invention and is not intended to limit the present invention. Any equivalent substitutions made within the principles of the present invention should be included in the protection scope of the present invention. The contents not elaborated in detail in the present invention belong to the existing technologies known to those skilled in the art.

Claims

1. An acid leaching device for bismuth processing, characterized in that: Included are: Reactor (1); A first hydraulic cylinder (3), the first hydraulic cylinder (3) being mounted on the reaction kettle (1), and the telescopic ends of the first hydraulic cylinder (3) being arranged to face upward; A lifting plate (2), the lifting plate (2) being connected between the telescopic ends of the first hydraulic cylinder (3); A cover plate (4), the cover plate (4) being rotatably connected to the lifting plate (2), and the cover plate (4) being used to perform a sealing and protective operation on the reaction kettle (1); A driving motor (5), wherein the driving motor (5) is mounted on the cover plate (4); A mounting plate (6), wherein the mounting plate (6) is mounted in the reaction kettle (1); A rotating assembly (7), the rotating assembly (7) being rotatably arranged on the mounting plate (6), and the top of the rotating assembly (7) being snap-connected with the driving motor (5); An air jet mechanism (8), the air jet mechanism (8) being arranged between the mounting plate (6) and the rotating assembly (7), the air jet mechanism (8) being used for early cooling to prevent the temperature from being too high; An exhaust mechanism (9) is arranged on the cover plate (4) and is used to filter the toxic gas generated after the reaction.

2. The acid leaching device for bismuth processing according to claim 1, characterized in that: The rotating assembly (7) comprises an air inlet frame (71) and an air outlet (72); the air inlet frame (71) is rotatably connected to the mounting plate (6); the top of the air inlet frame (71) is clamped to the driving motor (5); and the air outlet (72) is provided on the air inlet frame (71).

3. The acid leaching device for bismuth processing according to claim 2, characterized in that: The jet mechanism (8) comprises an air inlet pipe (81), the air inlet pipe (81) is arranged at the front side of the reaction kettle (1), the air inlet pipe (81) is connected to the reaction kettle (1) in a through-type manner, a heat conduction pipe (82) is installed at the rear of the air inlet pipe (81), two liquid inlet pipes (83) are arranged on the heat conduction pipe (82), the liquid inlet pipes (83) are both connected to the reaction kettle (1) in a through-type manner, a mounting frame (84) is connected to the rear end of the air inlet pipe (81), the mounting frame (84) is connected to the mounting plate (6), and the mounting frame (84) is rotatably connected to the rotating assembly (7).

4. The acid leaching device for bismuth processing according to claim 3, characterized in that: The exhaust mechanism (9) comprises a second hydraulic cylinder (91), the second hydraulic cylinder (91) is mounted on the upper left side of the cover plate (4), the telescopic end of the second hydraulic cylinder (91) is arranged to face upward, an exhaust assembly (92) is connected to the telescopic end of the second hydraulic cylinder (91), the exhaust assembly (92) is used to discharge the gas after adsorption treatment, a grille plate (93) is mounted on the bottom of the cover plate (4), the grille plate is used to perform preliminary filtering on the gas, an adsorption plate (94) is connected to the bottom of the exhaust assembly (92), and the adsorption plate (94) is used to adsorb and guide the gas.

5. The acid leaching device for bismuth processing according to claim 4, characterized in that: The invention also comprises a spraying mechanism (10), wherein the spraying mechanism (10) comprises a water inlet pipe (101), the water inlet pipe (101) is installed on the upper part of the reaction kettle (1), the water inlet pipe (101) and the reaction kettle (1) are in a through-type connection structure, a liquid separation frame (102) is connected to the rear end of the water inlet pipe (101), the liquid separation frame (102) is connected to the mounting plate (6), four spray heads (103) are installed on the bottom of the mounting plate (6), and the spray heads (103) are in communication with the liquid separation frame (102).

6. The acid leaching device for bismuth processing according to claim 5, characterized in that: The invention also comprises a stirring and cleaning mechanism (11), wherein the stirring and cleaning mechanism (11) comprises a mounting frame (111), wherein the mounting frame (111) is mounted on the mounting frame (84), a planetary gear set (112) is arranged in the mounting frame (111), an outer gear of the planetary gear set (112) is mounted on the mounting frame (111), a core gear in the middle of the planetary gear set (112) is mounted on the rotating assembly (7), and a rotating frame (113) is mounted on a gear ring in the planetary gear set (112).

7. The acid leaching device for bismuth processing according to claim 6, characterized in that: The invention also comprises a clamping mechanism (12), wherein the clamping mechanism (12) comprises a third hydraulic cylinder (121), wherein the third hydraulic cylinder (121) is mounted on the right side of the reactor (1), wherein the telescopic end of the third hydraulic cylinder (121) is arranged to face upward, wherein a lifting member (122) is connected to the telescopic end of the third hydraulic cylinder (121), wherein a fixing seat (124) is arranged on the upper side of the right side of the reactor (1), and wherein a pressing plate (123) for clamping and limiting the cover plate (4) is rotatably connected to the fixing seat (124).

8. The acid leaching device for bismuth processing according to claim 7, characterized in that: It also includes a support mechanism (13), the support mechanism (13) includes a fixing frame (131), the fixing frame (131) is connected to the front and rear sides of the lifting plate (2), and the fixing plates (132) are connected to the fixing frames (131), and the fixing plates (132) are used to push and support the cover plate (4).

9. The acid leaching device for bismuth processing according to claim 6, characterized in that: The rotating frame (113) is in a U-shaped structure as a whole and is used to scrape and clean the inner wall of the reaction kettle (1) and to perform stirring during the reaction process.

10. The acid leaching device for bismuth processing according to claim 7, characterized in that: The pressing plate (123) is connected to the lifting member (122) in a through-connection manner.