A method for acid leaching of mixed tungsten concentrate

Abstract

This invention discloses an acid leaching experimental method for tungsten mixed concentrate, relating to the technical field of acid leaching equipment; the raw materials are prepared as follows: raw materials include ore one, ore two, and a mixture, with the mixture being a 1:1 mass ratio of ore one and ore two; ore one has a mass percentage of WO3 ≥ 31.0%, CaCO3 ≥ 15.2%, and total calcium ≥ 12.1%; ore two has a mass percentage of WO3 ≥ 24.0%, CaCO3 ≥ 20.0%, and total calcium ≥ 18.2%; the slurry is prepared by mixing ore one, ore two, and... The mixture is mixed with bottom water and stirred to prepare a 50% concentration slurry. The slurry is then fed into a reactor, and the volume of dilute hydrochloric acid solution added is recorded. Addition is stopped when no more bubbles are generated between the dilute hydrochloric acid solution and the slurry. The mixed solution is pumped out to obtain ore filter residue, which is then rinsed with 75 ml of clean water. The mixture is stirred for 3-5 minutes, allowed to stand, and filtered to obtain a primary filtrate. The ore filter residue rinsed in step 6 is then rinsed again with 500 ml of clean water, stirred for 3-5 minutes, allowed to stand, and filtered to obtain a secondary filtrate and filter residue. This invention solves the technical problem of difficulty in observing or continuously observing the reaction within the existing reactor.

Description

Technical Field

[0001] This invention relates to the field of acid leaching equipment technology, specifically to an experimental method for acid leaching of tungsten mixed concentrate. Background Technology

[0002] For acid leaching tests on concentrates, hydrochloric acid solution is used to remove calcium carbonate and improve the tungsten grade of the concentrate. Currently, enterprises receive various raw materials, requiring raw material testing and acid leaching tests with different concentrations of hydrochloric acid. The tests need to assess tungsten loss in the filtrate, the improvement in tungsten concentrate quality, and the consumption of hydrochloric acid and water. This is necessary for large-scale industrial production of ore, and therefore requires corresponding experimental acid leaching equipment for testing.

[0003] Acid leaching equipment requires both the addition of solid raw materials and the continuous addition of hydrochloric acid solution. Currently, most acid leaching equipment operates on a single-chamber, single-experiment basis, which results in excessively long processing times for large-scale sampling experiments. Secondly, the gas produced by the reaction between dilute hydrochloric acid solution and calcium carbonate is carbon dioxide. When no gas is produced, it can be assumed that the calcium carbonate has relatively completely reacted. Therefore, it is necessary to observe whether bubbles are generated to determine the optimal ratio for continuous addition of dilute hydrochloric acid solution. However, the reaction inside the reactor is difficult to observe, and even with observation ports, continuous monitoring is challenging.

[0004] To address these issues, we have developed a novel elastomer and testing mechanism for high-pressure roller mill cylinders. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A method for acid leaching of tungsten mixed concentrate includes the following steps:

[0007] Step 1: Assemble the raw materials, which include mineral material one, mineral material two, and a mixture. The mixture is a 1:1 mass ratio of mineral material one to mineral material two.

[0008] Step 2: The first type of ore has a mass percentage of WO3 ≥ 31.0%, CaCO3 ≥ 15.2%, and total calcium ≥ 12.1%;

[0009] The second type of ore has a mass percentage of WO3 ≥ 24.0%, CaCO3 ≥ 20.0%, and total calcium ≥ 18.2%;

[0010] Step 3, preparing the slurry: Using a comparative control test, mineral material one, mineral material two and the mixture were respectively added to bottom water and stirred to prepare a slurry with a concentration of 50%;

[0011] Step 4: Dilute the raw hydrochloric acid to a hydrochloric acid solution, and prepare groups with concentrations of 1 mol / L and 2 mol / L;

[0012] Step 5: Pass the slurry into the reactor and install an inlet pipe on the reactor. Add dilute hydrochloric acid solution into the reactor continuously. Record the volume of dilute hydrochloric acid solution added. Stop adding dilute hydrochloric acid when no more bubbles are generated between the dilute hydrochloric acid solution and the slurry.

[0013] Step 6: Pump out the mixed solution to obtain mineral filter residue, add 75ml of water to rinse the mineral filter residue; stir for 3-5 minutes, let stand and filter to obtain the first filtrate;

[0014] Step 7: Add 500ml of clean water to the ore filter residue after rinsing in Step 6, stir for 3-5 minutes, let stand and filter to obtain secondary filtrate and filter residue.

[0015] In a further technical solution, the reaction vessel required for acid leaching in step 5 is provided with multiple reaction chambers and a drain pipe at the bottom of the reaction vessel; a fixing plate is installed inside the reaction vessel, and a filter screen frame is installed between the fixing plate and the drain pipe; the filter screen frame and the fixing plate are both funnel-shaped and fixedly connected.

[0016] A leakage hole is provided on the fixing plate;

[0017] A gas detector and a rotor flow meter are installed on the reactor. Each reaction chamber is provided with an exhaust port, and the exhaust port is connected to a gas pipeline connected to the gas detector. The gas detector is connected to the inlet of the rotor flow meter, and the outlet of the rotor flow meter is connected to an exhaust pipeline. An exhaust valve is connected to the outside of the exhaust pipeline.

[0018] A displacement sensor is installed on the rotor flow meter, and a rotor is installed in the rotor flow meter, with a light-blocking plate installed on the rotor.

[0019] In a further technical solution, a valve one is installed on the drain pipe; a valve two is installed on the inlet pipe; a separating pipe is provided between adjacent reaction chambers, and a shut-off valve one is installed on the separating pipe; when using a single set of reaction chambers independently, the shut-off valve one on the separating pipe is closed, and the single set of reaction chambers is inserted.

[0020] In a further technical solution, a discharge opening plate is installed on the reactor, and a closing ring is provided inside the reaction chamber; the closing ring is installed on a fixed plate.

[0021] Each reaction chamber is equipped with a pressurizing port, which is connected to a pressurizing pipe. Multiple pressurizing pipes are connected to a common main pressure pipe. An electromagnetic control valve and a pressure regulating valve are connected in series outside the main pressure pipe. A shut-off valve is installed on the pressurizing pipe. After the dilute hydrochloric acid solution reacts with the slurry, pressurized airflow needs to be introduced through the pressurizing port 9, and valve 1 needs to be opened to drain the liquid.

[0022] In a further technical solution, a position frame is detachably installed on the top of the reactor, and the gas detector is installed on the position frame;

[0023] The reactor is equipped with a stirring shaft and a liquid inlet pipe, and stirring blades are installed at the bottom of the stirring shaft.

[0024] In a further technical solution, the position frame is bent upwards, and a position plate is installed on the position frame, and a main motor is installed on the position plate. The output end of the main motor is set downwards, and a drive gear is installed on the output end.

[0025] The position frame has a lateral opening on the side facing the stirring shaft, and the drive gear is adapted to extend out of the lateral opening and be equipped with a double-sided rack. Both sides of the double-sided rack have teeth, and one side meshes with the drive gear.

[0026] A secondary gear is installed at the top of the reactor extending from the stirring shaft, and the secondary gear meshes with the tooth profile on the other side of the double-sided rack.

[0027] In a further technical solution, a guide plate is installed on the outside of the position frame, the guide plate is bent and a slide bar is provided inside; a slide groove is opened on the upper side of the double-sided rack, and the slide bar and the slide groove are adapted to each other.

[0028] In a further technical solution, a baffle is provided on one side of the double rack relative position frame, and a limit switch is installed on the position frame; two sets of limit switches are provided and are arranged opposite each other, and a protective plate is installed on the opposite side of the two sets of limit switches, and the protective plate is fixedly connected to the position frame at the side opening;

[0029] The protection plate has an opening slot, and the contact rod of the limit switch extends out of the opening slot;

[0030] In step 5, the main motor is turned on, driving the drive gear to mesh with the racks on both sides to move, and the racks on both sides drive multiple sets of auxiliary gears to rotate; simultaneously, the baffle moves to the limit switch contact rod, completing the opening and closing of the limit switch, and sending a signal to the controller. The controller is installed inside the reactor and transmits the signal to control the main motor to rotate in the opposite direction.

[0031] In a further technical solution, in step 5, the gas detector and displacement sensor detect two sets of signal graphs. The displacement range of the rotor flowmeter is ∈ [a,b], and when it is at the value b, no airflow passes through. The signal graph of the displacement sensor at the top of the rotor flowmeter converts to a digital graph that follows the trend of a→b→a. When the value a appears again, the valve two is closed by controlling the peripheral circuit board.

[0032] Compared with existing technologies, it has the following advantages:

[0033] This invention utilizes multiple reaction chambers for simultaneous reaction, facilitating observation of the reaction effect. A gear and rack system at the top enables simultaneous stirring, reducing equipment operating costs and achieving synchronized testing. A pressurized pipeline provides pressurized airflow for rapid discharge of the molten mineral through the drain pipe. This pressurized airflow also quickly cleans the inner walls of the reaction chambers, rapidly pressing the molten mineral onto a solid plate. This solid plate performs primary filtration of the molten mineral, while the molten mineral that falls onto the filter screen performs secondary filtration. The invention employs double-sided racks to achieve synchronous rotation of the drive and auxiliary gears. A limit switch located in the center of the positioning frame enables a pressing-triggering-reversing mechanism, allowing for reciprocating low-speed rotation. Attached Figure Description

[0034] Figure 1 This is a front view of the acid leaching equipment of the present invention;

[0035] Figure 2 This is a top view schematic diagram of the acid leaching equipment of the present invention;

[0036] Figure 3 This is a top cross-sectional view of the acid leaching equipment of the present invention;

[0037] Figure 4 for Figure 3 Enlarged view of part A;

[0038] Figure 5 for Figure 3 Enlarged view of part B;

[0039] Figure 6 This is a cross-sectional schematic diagram of the reaction vessel in this invention;

[0040] Figure 7 This is a schematic diagram of the external reaction chamber of the present invention;

[0041] Figure 8 This is a rotor structure diagram of the present invention;

[0042] Figure 9 This is a schematic diagram of the guide plate of the present invention;

[0043] Figure 10 This is a schematic diagram of the position frame of the present invention;

[0044] Figure 11 This is a graph showing the rotor displacement versus time in the acid leaching test method of the present invention.

[0045] In the picture:

[0046] 1. Reactor; 2. Reaction chamber; 3. Drain pipe; 4. Fixing plate; 5. Filter frame; 6. Gas detector; 7. Rotor flow meter; 8. Exhaust port; 10. Displacement sensor; 11. Rotor; 12. Valve 1; 13. Valve 2; 14. Separating pipe; 15. Shut-off valve 1; 16. Discharge opening plate; 17. Pressurization pipe; 18. Total pressure pipe; 19. Electromagnetic control valve; 20. Pressure regulating valve; 21. Shut-off valve 2; 22. Positioning frame; 23. Stirring shaft; 24. Main motor; 25. Side opening; 26. Drive gear; 27. Double-sided rack; 28. Secondary gear; 29. ​​Guide plate; 30. Slide groove; 31. Slide bar; 32. Baffle; 33. Limit switch; 34. Protection plate. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0048] Please see Figure 1-11 This invention provides a technical solution, a method for acid leaching of tungsten mixed concentrate, comprising the following steps:

[0049] Step 1: Assemble the raw materials, which include mineral material one, mineral material two, and a mixture. The mixture is a 1:1 mass ratio of mineral material one to mineral material two.

[0050] Step 2: The first type of ore has a mass percentage of WO3 ≥ 31.0%, CaCO3 ≥ 15.2%, and total calcium ≥ 12.1%;

[0051] The second type of ore has a mass percentage of WO3 ≥ 24.0%, CaCO3 ≥ 20.0%, and total calcium ≥ 18.2%;

[0052] Step 3, preparing the slurry: Using a comparative control test, mineral material one, mineral material two and the mixture were respectively added to bottom water and stirred to prepare a slurry with a concentration of 50%;

[0053] Step 4: Dilute the raw hydrochloric acid to a hydrochloric acid solution, and prepare groups with concentrations of 1 mol / L and 2 mol / L;

[0054] Step 5: Pass the slurry into reactor 1, and install a liquid inlet pipe on reactor 1. Add dilute hydrochloric acid solution into reactor 1, and add the dilute hydrochloric acid solution continuously; record the volume of dilute hydrochloric acid solution added; stop adding dilute hydrochloric acid when no more bubbles are generated between the dilute hydrochloric acid solution and the slurry.

[0055] Step 6: Pump out the mixed solution to obtain mineral filter residue, add 75ml of water to rinse the mineral filter residue; stir for 3-5 minutes, let stand and filter to obtain the first filtrate;

[0056] Step 7: Add 500ml of clean water to the ore filter residue after rinsing in Step 6, stir for 3-5 minutes, let stand and filter to obtain secondary filtrate and filter residue.

[0057] Table 1 below lists a set of components of the raw ore:

[0058] Table 1. Elemental analysis results of experimental raw materials

[0059]

[0060] Further, through the above-mentioned acid leaching and refining methods, the following acid leaching indicators were obtained, as shown in Table 2-4 below:

[0061] Table 2. Results of acid leaching of ore

[0062]

[0063] Table 3. Results of acid leaching of persimmon concentrate

[0064]

[0065]

[0066] Table 4. Results of acid leaching of mixed concentrate

[0067]

[0068] The consumption of hydrochloric acid and water during the acid leaching process is shown in Table 5-7:

[0069] Table 5. Consumption of Dongbo Concentrate Materials

[0070] Hydrochloric acid concentration (mol) Hydrochloric acid consumption (mol / kg concentrate) Industrial water consumption (L / kg concentrate) 2 3.12 26.11 1 3.36 61.63

[0071] Table 6. Consumption of Concentrates in Persimmon Selection

[0072] Hydrochloric acid concentration (mol) Hydrochloric acid consumption (mol / kg concentrate) Industrial water consumption (L / kg concentrate) 2 3.61 31.24 1 3.75 68.87

[0073] Table 7. Consumption of Concentrated Minerals

[0074] Hydrochloric acid concentration (mol) Hydrochloric acid consumption (mol / kg concentrate) Industrial water consumption (L / kg concentrate) 2 3.74 34.82 1 3.78 75.11

[0075] Experimental conclusion:

[0076] 1. The acid leaching index shows that when the calcium carbonate content in the tungsten concentrate fluctuates within the range of 15.54%-20.11%, the calcium carbonate content in the concentrate after acid leaching does not exceed 0.5%. At the same time, the grade of the tungsten concentrate increases from 31%, 24%, and 27% to 37%, 31%, and 34%, respectively, with an increase of 6 to 7 percentage points.

[0077] 2. When using 1 mol / L (3.65%) and 2 mol / L (7.30%) hydrochloric acid solutions as raw materials for acid leaching tests, the tungsten content in the filtrate after acid leaching fluctuated within the range of 0.5 mg / L to 1.5 mg / L, and the loss rate of tungsten metal in the filtrate did not exceed 0.0025%.

[0078] 3. According to the test results, the hydrochloric acid consumption of Dongbo tungsten concentrate is 3.24 mol / (kg concentrate), that is, 0.394 tons of industrial hydrochloric acid (30% concentration) are consumed per ton of tungsten concentrate; the hydrochloric acid consumption of Shixuan tungsten concentrate is 3.68 mol / (kg concentrate), that is, 0.448 tons of industrial hydrochloric acid (30% concentration) are consumed per ton of tungsten concentrate; and the hydrochloric acid consumption of mixed concentrate is 3.76 mol / (kg concentrate), that is, 0.458 tons of industrial hydrochloric acid (30% concentration) are consumed per ton of tungsten concentrate.

[0079] 4. The industrial water consumption during acid leaching is as follows: Under high-concentration hydrochloric acid solution (2 mol / L), the concentrate from the eastern beneficiation process requires 26.11 m³ of water. 3 / ton of concentrate; water required for persimmon concentrate beneficiation is 31.24m³. 3 / ton of concentrate; mixed concentrate requires 34.82m³ of water. 3 / ton of concentrate. Under low-concentration hydrochloric acid solution (1mol / L) conditions, the concentrate from the eastern beneficiation process requires 61.63m³ of water. 3 / ton of concentrate; water required for persimmon concentrate beneficiation is 68.87m³. 3 / ton of concentrate; mixed concentrate requires 75.11m of water. 3 / ton concentrate;

[0080] 5. Finally, a high-concentration hydrochloric acid solution (2 mol / L) was used as the condition, with the mixed concentrate as the raw material. Each ton of concentrate consumed 0.458 tons of industrial hydrochloric acid. The pH of the acid leaching filtrate was maintained at approximately 2.5. Calculating based on pH=2, the residual hydrochloric acid in the filtrate was 0.01 mol / L (concentration 0.0365%). The water consumption was 34.82 m³ / ton of concentrate, resulting in 348.2 mol of residual hydrochloric acid, or 0.042 tons of industrial hydrochloric acid, representing a residual amount of 9.17%.

[0081] Further, such as Figure 1-3As shown, the reaction vessel 1, which requires acid leaching in step 5, is provided with multiple reaction chambers 2 and a drain pipe 3 at the bottom of the reaction vessel 1; a fixing plate 4 is installed inside the reaction vessel 1, and a filter screen frame 5 is installed between the fixing plate 4 and the drain pipe 3; the filter screen frame 5 and the fixing plate 4 are both funnel-shaped and fixedly connected; a drain hole is provided on the fixing plate 4;

[0082] A gas detector 6 and a rotor flow meter 7 are installed on the reaction vessel 1. Each reaction chamber 2 is provided with an exhaust port 8, and the exhaust port 8 is connected to the gas detector 6 via a gas pipeline. The gas detector 6 is connected to the inlet of the rotor flow meter 7. A displacement sensor 10 is installed on the rotor flow meter 7, and a rotor 11 is provided in the rotor flow meter 7. A light-blocking plate is provided on the rotor 11. Figure 8 As shown.

[0083] A valve 12 is installed on the drain pipe 3; a valve 13 is installed on the inlet pipe; a separation pipe 14 is provided between adjacent reaction chambers 2, and a shut-off valve 15 is installed on the separation pipe 14; when using a single set of reaction chambers 2 independently, the shut-off valve 15 on the separation pipe 14 is closed, and the single set of reaction chambers is placed in.

[0084] A discharge opening plate 16 is installed on the reactor 1, and a closing ring is provided inside the reaction chamber 2; the closing ring is installed on the fixed plate 4; as Figure 2 and 3 As shown, each reaction chamber 2 is equipped with a pressurization port 9, and the pressurization port 9 is equipped with a pressurization pipe 17 and a total pressure pipe 18. An electromagnetic control valve 19 and a pressure regulating valve 20 are connected in series outside the total pressure pipe 18. A shut-off valve 21 is installed on the pressurization pipe 17. After the dilute hydrochloric acid solution reacts with the slurry, pressurized airflow needs to be introduced through the pressurization port 9 and the valve 12 needs to be opened to drain the liquid.

[0085] A position frame 22 is detachably installed on the top of the reactor 1, and the gas detector 6 is installed on the position frame 22; a stirring shaft 23 and a liquid inlet pipe are installed on the reactor 1, and stirring blades are installed at the bottom of the stirring shaft 23.

[0086] like Figure 4 , 5As shown in Figure 10, the position frame 22 is bent upwards, and a position plate is installed on the position frame 22. A main motor 24 is installed on the position plate. The output end of the main motor 24 is set downwards, and a drive gear 26 is installed on the output end. A lateral opening 25 is opened on the side of the position frame 22 facing the stirring shaft 23. The drive gear 26 is adapted to extend out of the lateral opening 25 and is equipped with a double-sided rack 27. Both sides of the double-sided rack 27 are provided with teeth, and one side meshes with the drive gear 26. A secondary gear 28 is installed at the top of the reactor 1 where the stirring shaft 23 extends. The secondary gear 28 meshes with the other side of the teeth of the double-sided rack 27.

[0087] like Figure 9 As shown, a guide plate 29 is installed on the outside of the position frame 22. The guide plate 29 is bent and a slide bar 31 is provided inside. A slide groove 30 is provided on the upper side of the double-sided rack 27. The slide bar 31 and the slide groove 30 are adapted to each other.

[0088] like Figure 5 As shown, a baffle 32 is provided on one side of the double-sided rack 27 relative to the position frame 22, and a limit switch 33 is installed on the position frame 22; two sets of limit switches 33 are provided and installed opposite each other, and a protective plate 34 is installed on the opposite side of each set of limit switches 33. The protective plate 34 is fixedly connected to the position frame 22 at the lateral opening 25; the baffle 32 is located between the limit switches, and reciprocating movement control is achieved by moving the baffle between the two sets of limit switches. An opening slot is opened on the protective plate 34, and the contact rod of the limit switch 33 extends out of the opening slot;

[0089] In step 5, the main motor 24 is turned on, which drives the drive gear 26 to mesh with the double-sided rack 27 to move. The double-sided rack 27 drives multiple sets of auxiliary gears 28 to rotate. Simultaneously, the baffle 32 moves to the limit switch 33 to abut the rod, completing the opening and closing of the limit switch 33 and sending a signal to the controller. The controller is installed inside the reactor 1 and transmits the signal to control the main motor 24 to rotate in the opposite direction.

[0090] like Figure 11 As shown, in step 5, the gas detector 6 and displacement sensor 10 detect two sets of signal graphs. The displacement range of the rotor flowmeter 7 is ∈ [a, b], and when it is at value b, no airflow passes through. The signal graph of the displacement sensor 10 at the top of the rotor flowmeter 7 converts to a digital graph following the trend a→b→a. When value a reappears, valve 13 is closed via the external circuit board. The change between a and b is a continuous curve or straight line, referring to the continuity of the actual reaction.

[0091] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0092] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for acid leaching of tungsten mixed concentrate, characterized in that, Includes the following steps: Step 1: Assemble the raw materials, which include mineral material one, mineral material two, and a mixture. The mixture is a 1:1 mass ratio of mineral material one to mineral material two. Step 2: The ore sample 1 has the following mass percentages: WO3 ≥ 31.0%, CaCO3 ≥ 15.2%, and total calcium ≥ 12.1%; The second type of ore has the following mass percentages: WO3 ≥ 24.0%, CaCO3 ≥ 20.0%, and total calcium ≥ 18.2%; Step 3, preparing the slurry: Using a comparative control test, mineral material one, mineral material two and the mixture were respectively added to bottom water and stirred to prepare a slurry with a concentration of 50%; Step 4: Dilute the raw hydrochloric acid to a hydrochloric acid solution, and prepare groups with concentrations of 1 mol / L and 2 mol / L; Step 5: The slurry is fed into the reactor (1), and an inlet pipe is installed on the reactor (1). Dilute hydrochloric acid solution is added to the reactor (1) continuously. The volume of dilute hydrochloric acid solution added is recorded. A detection device is set up. When no bubbles are generated between the dilute hydrochloric acid solution and the slurry, the addition of dilute hydrochloric acid is stopped. The reactor (1) is provided with multiple reaction chambers (2), and a position frame (22) is detachably installed on the top of the reactor (1). A stirring shaft (23) is installed on the reactor (1). The position frame (22) is bent upwards, and a position plate is installed on the position frame (22), and a main motor (24) is installed on the position plate. The output end of the main motor (24) is set downwards, and a drive gear (26) is installed on the output end. The position frame (22) has a lateral opening (25) on the side facing the stirring shaft (23), and the drive gear (26) is adapted to extend out of the lateral opening (25) and be equipped with a double-sided rack (27). The double-sided rack (27) has teeth on both sides, and one side meshes with the drive gear (26). A secondary gear (28) is installed on the top of the reactor (1) extending from the stirring shaft (23), and the secondary gear (28) meshes with the tooth profile on the other side of the double-sided rack (27); A baffle (32) is provided on one side of the double-sided rack (27) relative to the position frame (22), and a limit switch (33) is installed on the position frame (22); two sets of limit switches (33) are provided and installed opposite each other, and a protective plate (34) is installed on the opposite side of each set of limit switches (33), and the protective plate (34) is fixedly connected to the position frame (22) at the side opening (25); The protective plate (34) has an opening slot, and the contact rod of the limit switch (33) extends out of the opening slot; Turn on the main motor (24), which drives the drive gear (26) to mesh with the racks on both sides (27) to move. The racks on both sides (27) drive multiple sets of auxiliary gears (28) to rotate. At the same time, the baffle (32) moves to the limit switch (33) to abut the rod, completing the opening and closing of the limit switch (33) and sending a signal to the controller. The controller is installed inside the reactor (1) and sends a signal to control the main motor (24) to rotate in the opposite direction. Step 6: Pump out the mixed solution to obtain mineral filter residue, add 75ml of water to rinse the mineral filter residue; stir for 3-5 minutes, let stand and filter to obtain the first filtrate; Step 7: Add 500ml of clean water to the ore filter residue after rinsing in Step 6, stir for 3-5 minutes, let stand and filter to obtain secondary filtrate and filter residue.

2. The acid leaching experimental method for tungsten mixed concentrate according to claim 1, characterized in that, A drain pipe (3) is provided at the bottom of the reactor (1); a fixing plate (4) is installed inside the reactor (1), and a filter screen frame (5) is installed between the fixing plate (4) and the drain pipe (3); the filter screen frame (5) and the fixing plate (4) are both funnel-shaped and fixedly connected; A leakage hole is provided on the fixing plate (4); The detection device is installed on the reactor (1), including a gas detector (6) and a rotor flow meter (7). Each set of reaction chambers (2) is provided with an exhaust port (8), and the exhaust port (8) is connected to the gas pipeline connected to the gas detector (6), and the gas detector (6) is connected to the inlet of the rotor flow meter (7). A displacement sensor (10) is installed on the rotor flowmeter (7), and a rotor (11) is provided in the rotor flowmeter (7), and a light-blocking plate is provided on the rotor (11).

3. The acid leaching experimental method for tungsten mixed concentrate according to claim 2, characterized in that, A valve 1 (12) is installed on the drain pipe (3); a valve 2 (13) is installed on the inlet pipe; a separation pipe (14) is provided between adjacent reaction chambers (2), and a shut-off valve 1 (15) is installed on the separation pipe (14); when using a single reaction chamber (2) independently, the shut-off valve 1 (15) on the separation pipe (14) is closed, and the single reaction chamber is placed in.

4. The acid leaching experimental method for tungsten mixed concentrate according to claim 3, characterized in that, A discharge opening plate (16) is installed on the reactor (1), and a closing ring is provided in the reaction chamber (2); the closing ring is installed on the fixed plate (4); Each reaction chamber (2) is equipped with a pressurizing port (9), and a pressurizing pipe (17) is installed on the pressurizing port (9). A total pressure pipe (18) is connected to the outside of the pressurizing pipe (17), and an electromagnetic control valve (19) and a pressure regulating valve (20) are connected in series outside the total pressure pipe (18). A shut-off valve (21) is installed on the pressurizing pipe (17). After the dilute hydrochloric acid solution reacts with the slurry, pressurized airflow needs to be introduced from the pressurizing port (9), and valve one (12) needs to be opened to drain the liquid.

5. The acid leaching experimental method for tungsten mixed concentrate according to claim 3, characterized in that, The gas detector (6) is mounted on the positioning frame (22); The bottom of the stirring shaft (23) is equipped with stirring blades.

6. The acid leaching experimental method for tungsten mixed concentrate according to claim 5, characterized in that, The position frame (22) is equipped with a guide plate (29), which is bent and has a slide bar (31) inside; a slide groove (30) is provided on the upper side of the double-sided rack (27), and the slide bar (31) and the slide groove (30) are compatible.

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