A zinc dust replacement system with deoxygenated lean liquid slurry

Abstract

The utility model discloses a kind of zinc powder replacement systems of deoxygenated lean liquid size mixing, deoxygenated tower top is connected with precious liquid pool, and lower end is connected with replacement pump feed pipe by deoxygenated tower liquid discharge pipe, and another end of replacement pump feed pipe is connected with replacement cabinet by replacement pump, and replacement cabinet is connected with lean liquid pool by electromagnetic flowmeter and replacement cabinet liquid discharge pipe.Mixing tank is connected with liquid level bucket by pipeline.Deoxygenated tower top is also connected with suction chamber of injector by injector vacuum tube, and liquid inlet end of injector is connected with lean liquid pool by injector liquid inlet pipe and jet pump, and diffusion pipe of injector is connected with lean liquid pool by injector discharge pipe;Injector liquid inlet pipe is connected with liquid level bucket inside by liquid level bucket liquid supply pipe and electromagnetic flowmeter.Mixing tank lower end is connected with replacement pump feed pipe by mixing tank discharge pipe;Replacement cabinet liquid discharge pipe is connected with precious liquid pool by replacement cabinet circulation pipe.Solve the problem of damage to replacement system low-oxygen environment by ordinary lean liquid zinc powder size mixing, avoid causing the waste of zinc powder and the fluctuation of lean liquid index.

Description

Technical Field

[0001] This utility model relates to a zinc powder replacement system, specifically a zinc powder replacement system for deoxygenated lean liquor slurry preparation, belonging to the field of gold beneficiation engineering technology. Background Technology

[0002] In the field of gold beneficiation, the zinc powder displacement process is widely used as the primary method for extracting gold from cyanide-containing gold and silver precious solutions. Its workflow includes deoxidation of the precious solution, addition of zinc powder, zinc powder displacement, and solid-liquid separation. The role of zinc powder is to displace gold and silver from the solution.

[0003] The system for implementing the zinc powder replacement process includes a zinc powder adding device, which typically consists of a feed pipe, a zinc powder mixing tank, a zinc powder feeder, and a discharge pipe. The feeding method is as follows: the feed pipe is installed as a branch pipe at the pressure end of the main outlet pipeline of the replacement pump, and the discharge pipe is installed as a branch pipe at the negative pressure end of the main inlet pipeline of the replacement pump. During the operation of the replacement pump, the pressure difference generated at the inlet and outlet drives the fluid within the device to form a forced circulation. The zinc slurry formed by mixing in the zinc powder mixing tank is stably transported to the replacement cabinet through the main pipeline under continuous circulation. The main function of the zinc powder adding device is to achieve efficient mixing and stable transportation of zinc powder and deoxidizing solution, providing a stable and uniformly mixed zinc slurry for the replacement reaction. However, in production use, the zinc powder adding device has the following problems: the mixing tank, feed pipe, and discharge pipe circulate zinc slurry for a long time, causing the zinc powder to react with the solution. Scale formation of reactants easily occurs on the tank and pipe walls, seriously affecting the stable input of zinc powder into the replacement cabinet, causing fluctuations in the lean solution index, and increasing the workload of cleaning.

[0004] To address the scaling problem on tank and pipe walls caused by the reaction of zinc powder with precious metal solutions, some in the industry have proposed using lean solutions as the zinc powder slurry preparation medium. However, the common practice is to directly use lean solutions that have not undergone deoxygenation treatment for slurry preparation. The main drawback is that this leads to an increase in dissolved oxygen content in the system, disrupting the low-oxygen environment required for the zinc powder displacement reaction. This not only increases zinc powder consumption but may also trigger the re-dissolution of precipitated gold elements, thereby reducing the precious metal recovery rate. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a zinc powder replacement system for deoxygenated lean liquor slurry preparation, so as to solve the problem of damage to the low oxygen environment of the replacement system caused by ordinary lean liquor zinc powder slurry preparation, and avoid waste of zinc powder and fluctuation of lean liquor indicators.

[0006] The technical solution of this utility model is as follows:

[0007] A zinc powder displacement system for deoxidizing lean liquor slurry preparation includes a deoxidation tower top connected to a high-quality liquor tank via a deoxidation tower inlet pipe, a displacement pump inlet pipe connected to the bottom of the deoxidation tower via a deoxidation tower outlet pipe, and a displacement pump inlet pipe connected to the other end of the displacement pump inlet pipe. The displacement pump outlet is connected to the inlet of the displacement cabinet via a displacement cabinet inlet pipe, and the outlet of the displacement cabinet is connected to the lean liquor tank via a second electromagnetic flowmeter and the displacement cabinet outlet pipe. A zinc powder feeder is installed above a mixing tank, which is connected to a level tank via a pipeline. The top of the deoxidation tower is connected to the ejector suction chamber via an ejector vacuum pipe, and the ejector inlet is connected to the ejector inlet pipe and... The jet pump is connected to the lean liquor tank, and the diffuser tube of the jet pump is connected to the lean liquor tank through the jet pump discharge pipe; the jet pump inlet pipe is connected to the inside of the level tank through the level tank supply pipe and the first electromagnetic flowmeter; the lower end of the mixing tank is connected to the displacement pump inlet pipe through the mixing tank discharge pipe; the displacement cabinet discharge pipe is connected to the premium liquor tank through the displacement cabinet circulation pipe; valves are installed on the displacement cabinet discharge pipe, displacement cabinet circulation pipe, level tank supply pipe, deoxygenation tower discharge pipe, and displacement pump inlet pipe; valves are installed on the pipes between the jet pump and the lean liquor tank, the pipes between the lean liquor pump and the lean liquor tank, and the pipes between the mixing tank and the mixing tank discharge pipe.

[0008] Preferably, the lean liquid tank is equipped with a baffle plate with an overflow space at the top; the baffle plate divides the lean liquid tank space into two parts: a lean liquid buffer tank and a lean liquid discharge tank.

[0009] Preferably, the feed end of the jet pump is connected to the lean liquid buffer tank via a pipeline.

[0010] Preferably, the lean liquid discharge tank is connected to a lean liquid pump via a pipeline equipped with an eighth valve, and the outlet end of the lean liquid pump is connected to a lean liquid discharge pipe.

[0011] Preferably, the outlet end of the displacement cabinet is connected to the discharge pipe of the displacement cabinet via a second electromagnetic flow meter.

[0012] The lean liquid buffer tank is described above; the diffuser tube of the jet injector is connected to the lean liquid discharge tank through the jet injector discharge pipe.

[0013] Preferably, a float level control mechanism for controlling the liquid supply volume of the liquid level tank is installed on the liquid supply pipe located inside the liquid level tank.

[0014] Preferably, the float level control mechanism includes a butterfly valve installed on the liquid supply pipe of the level tank;

[0015] The butterfly valve plate is connected to a float via a connecting rod.

[0016] The beneficial effects of this utility model are as follows:

[0017] First, in this invention, the zinc powder in the mixing tank and the discharge pipe of the mixing tank comes into contact with the lean liquid. The lean liquid is the freshly replaced liquid, with low dissolved oxygen and solid content, and the free cyanide ions and alkalinity are maintained at suitable concentrations. This liquid environment will not affect the subsequent efficient replacement reaction of zinc powder with gold and silver in the precious liquid. Therefore, the medium transported in the supply pipe of the liquid level tank of this invention is only the newly generated lean liquid after the replacement reaction. No chemical reaction occurs during the transportation process, thus fundamentally eliminating the formation of scale in the supply pipe. Second, the liquid power source of the liquid level tank supply pipe of this invention is a jet-driven pump. The pump can ensure stable liquid pressure in the supply pipe of the liquid level tank, which is beneficial for liquid level control. The outlet end of the discharge pipe of the replacement cabinet is located at the bottom of the lean liquid buffer tank and is always below the liquid surface, which can effectively form a liquid seal, thereby preventing air from being entrained into the lean liquid after replacement and ensuring the low-oxygen state of the lean liquid. Attached Figure Description

[0018] Figure 1 This is a schematic diagram illustrating the structure and working principle of an embodiment of the zinc powder replacement system of this utility model.

[0019] Figure 2 This is a schematic diagram of the float level control mechanism in an embodiment of the zinc powder replacement system of this utility model.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Deoxidizer tower feed pipe; 2. Deoxidizer tower; 3. Ejector vacuum tube; 4. Ejector; 5. Ejector discharge pipe; 6. Ejector inlet pipe; 7. Liquid level tank supply pipe; 8. First electromagnetic flowmeter; 9. Ejector pump; 10. Float level control mechanism; 11. Liquid level tank; 12. Mixing tank; 13. Zinc powder feeder; 14. First valve; 15. Deoxidizer tower discharge pipe; 16. Mixing tank discharge pipe; 17. Displacement pump feed pipe; 18. Displacement pump; 19. Displacement cabinet feed pipe; 20. Displacement cabinet ; 21. Second electromagnetic flowmeter; 22. Displacement cabinet drain pipe; 23. Lean solution buffer tank; 24. Baffle plate; 25. Lean solution tank; 26. Lean solution pump; 27. Lean solution discharge pipe; 28. Displacement cabinet circulation pipe; 29. ​​Precious solution tank; 30. Second valve; 31. Third valve; 32. Fourth valve; 33. Fifth valve; 34. Sixth valve; 35. Seventh valve; 36. Eighth valve; 10-1. Butterfly valve; 10-2. Connecting rod; 10-3. Float; 10-1-1. Butterfly valve plate. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0023] like Figure 1An embodiment of the zinc powder replacement system of this utility model includes a deoxidation tower 2, a high-quality liquid tank 29, an ejector 4, a low-quality liquid tank 25, an interconnected liquid level tank 11 and a mixing tank 12, a replacement pump 18, and a replacement cabinet 20. A zinc powder feeder 13 is installed above the mixing tank 12. The ejector 4 has a suction chamber, a liquid inlet end, and a diffuser.

[0024] The lean liquid tank 25 is equipped with a baffle 24 with an overflow space at the top, which divides the lean liquid tank space into two parts: a lean liquid buffer tank 23 and a lean liquid discharge tank. In use, the lean liquid in the lean liquid buffer tank 23 overflows into the lean liquid discharge tank through the upper side of the baffle 24.

[0025] The top of the deoxygenation tower 2 is connected to the precious liquid tank 29 via a deoxygenation tower feed pipe 1, and the inlet of the deoxygenation tower feed pipe 1 is immersed in the precious liquid in the precious liquid tank 29. The top of the deoxygenation tower 2 is also connected to the suction chamber of the ejector 4 via an ejector vacuum pipe 3. The lower end of the deoxygenation tower 2 is connected to a deoxygenation tower discharge pipe 15, and a fifth valve 33 is installed on the pipe of the deoxygenation tower discharge pipe 15. The inlet end of the ejector 4 is connected to an ejector pump 9 via an ejector inlet pipe 6, and the diffuser of the ejector 4 is connected to the lean liquid 25 via an ejector discharge pipe 5. Specifically, the lower end of the ejector discharge pipe 5 is connected to the lean liquid discharge tank.

[0026] The jet injector inlet pipe 6 is connected to a liquid level tank supply pipe 7, the other end of which is located inside the liquid level tank 11. A first electromagnetic flowmeter 8 and a fourth valve 32 are also installed on the liquid level tank supply pipe 7. A float level control mechanism 10 for controlling the liquid supply volume of the liquid level tank supply pipe 7 is installed on the pipe inside the liquid level tank 11.

[0027] The feed end of the displacement pump 18 is connected to the displacement pump feed pipe 17, and a sixth valve 34 is installed on the displacement pump feed pipe 17. The discharge end is connected to the inlet end of the displacement cabinet 20 through the displacement cabinet feed pipe 19. The lower end of the mixing tank 12 is connected to the mixing tank discharge pipe 16 through the first valve 14. The lower ends of the deoxidation tower discharge pipe 15 and the mixing tank discharge pipe 16 are respectively connected to the displacement pump feed pipe 17.

[0028] The outlet end of the displacement cabinet 20 is connected to a displacement cabinet circulation pipe 28 via a second electromagnetic flow meter 21, and a third valve 31 is installed on the circulation pipe 28. The other end of the displacement cabinet circulation pipe 28 is connected to the precious liquid tank 29. In use, the outlet end of the displacement cabinet circulation pipe 28 is located inside the precious liquid tank 29.

[0029] The outlet end of the displacement tank 20 is also connected to a displacement tank drain pipe 22 via a second electromagnetic flow meter 21. The other end of the displacement tank drain pipe 22 is connected to the lean liquid buffer tank 23, and the outlet end of the displacement tank drain pipe 22 is located at the bottom of the lean liquid buffer tank 23 and is always submerged below the liquid surface. A second valve 30 is installed on the displacement tank drain pipe 22. The feed end of the jet pump 9 is connected to the lean liquid buffer tank 23 via a pipe equipped with a seventh valve 35.

[0030] The lean liquid discharge tank is connected to a lean liquid pump 26 via a pipeline equipped with an eighth valve 36, and the outlet end of the lean liquid pump 26 is connected to a lean liquid discharge pipe 27.

[0031] like Figure 2 The float level control mechanism 10 is composed of a butterfly valve 10-1, a connecting rod 10-2, and a float 10-3. Specifically, a butterfly valve 10-1 for controlling the liquid supply of the liquid level tank 11 is installed on the pipeline of the liquid level tank supply pipe 7 located inside the liquid level tank 11. The butterfly valve plate 10-1-1 of the butterfly valve 10-1 is connected to the float 10-3 through the connecting rod 10-2.

[0032] The working principle of the float level control mechanism 10 is as follows: when the liquid level in the level tank 11 decreases, the float 10-3 descends under the influence of gravity. Simultaneously, the connecting rod 10-2 rotates the butterfly valve plate 10-1-1 downwards, increasing the opening of the butterfly valve 10-1 and thus increasing the liquid supply from the level tank supply pipe 7. As the liquid level in the level tank 11 increases, the float 10-3 rises under the influence of buoyancy, and the connecting rod 10-2 rotates the butterfly valve plate 10-1-1 upwards, decreasing the opening of the butterfly valve 10-1 and thus reducing the liquid supply from the level tank supply pipe 7. Under the control of the float level control mechanism 10, the liquid level in the level tank 11 is kept stable within a certain range.

[0033] The lean liquid in the lean liquid buffer tank 23 enters the jet-driven pump 9 and is pumped into the jet inlet pipe 6. A portion of the liquid is discharged to the lean liquid discharge tank via the jet ejector 4 and the jet ejector discharge pipe 5. The liquid level in the lean liquid discharge tank is always lower than the height of the baffle 24, and the liquid in the lean liquid buffer tank 23 can overflow to the lean liquid discharge tank through the baffle 24. Another portion is discharged to the liquid level tank 11 via the liquid level tank supply pipe 7 for zinc powder slurry preparation. Generally, the outlet of the liquid level tank supply pipe 7 is at least 10 cm below the liquid surface in the liquid level tank 11. The amount of this other portion is monitored by the first electromagnetic flowmeter 8 and controlled by the first valve 14, the fourth valve 32, and the float level control mechanism 10.

[0034] Open valves 35 and 36 to start the jet drive pump 9. The lean liquid in the lean liquid buffer tank 23 flows into the jet injector 4 through the jet injector inlet pipe 6, and then into the lean liquid discharge tank through the jet injector discharge pipe 5. Under the action of high-pressure fluid, the suction chamber of the jet injector 4 generates negative pressure, which creates negative pressure in the deoxygenation tower 2 through the jet injector vacuum pipe 3. Under continuous vacuum, the precious liquid in the precious liquid tank 29 is drawn into the deoxygenation tower 2 through the deoxygenation tower inlet pipe 1 for precious liquid deoxygenation. As the liquid level in the deoxygenation tower 2 rises and the jet injector 4 continues to operate, the vacuum gauge pressure of the deoxygenation tower 2 reaches and stabilizes at -0.09 MPa. At this time, the third valve 31, the sixth valve 34, the first valve 14, and the fourth valve 32 are opened in sequence. The liquid in the ejector inlet pipe 6 enters the liquid level tank 11 and the mixing tank 12 in sequence through the liquid level tank supply pipe 7, and then flows into the displacement pump 18 through the mixing tank discharge pipe 16 and the displacement pump inlet pipe 17, forming a liquid column in the displacement cabinet inlet pipe 19. After the liquid level in the mixing tank 12 stabilizes, the opening of the first valve 14 is reduced, the displacement pump 18 is turned on, and the fifth valve 33 is opened at the same time. The deoxygenated precious liquid in the deoxygenation tower 2 enters the displacement pump 18 through the deoxygenation tower discharge pipe 15 and the displacement pump inlet pipe 17. Under the action of the displacement pump 18, the liquid enters the displacement cabinet 20 through the displacement cabinet inlet pipe 19, flows through the second electromagnetic flowmeter 21, and then flows into the precious liquid pool 29 through the displacement cabinet circulation pipe 28.

[0035] Once the flow rates of the first electromagnetic flowmeter 8 and the second electromagnetic flowmeter 21 are stable, turn on the zinc powder feeder 13, increase the belt speed, and begin zinc powder slurry application. During the process, continuously sample the liquid in the circulation pipe 28 of the replacement cabinet and test the gold content of the liquid. When the gold content of the liquid is lower than 0.05 mg / L, the slurry application ends.

[0036] Adjust the zinc powder feeding speed to the normal feeding speed, open the second valve 30 and close the third valve 31. After replacement, the lean liquor is discharged into the lean liquor buffer tank 23. As the liquid level in the lean liquor buffer tank 23 rises to the height of the baffle 24, the lean liquor begins to overflow into the lean liquor discharge tank. After the liquid level in the lean liquor discharge tank reaches a certain height (below the height of the baffle), the lean liquor pump 26 starts, and the lean liquor is discharged from the system through the lean liquor discharge pipe 27.

[0037] To avoid oversaturation of the metal in the replacement tank 20, which could cause filter cloth to wear through and fluctuations in the lean liquor index, and to better complete the subsequent metal balancing work, it is necessary to count the amount of metal in the replacement tank 20. When the amount of metal in the tank reaches saturation (for example, when it reaches 100kg), the tank should be unloaded.

[0038] The method for calculating metal content is as follows: Each shift, technicians obtain the cumulative processing volume Q1 reading from the first electromagnetic flowmeter 8 and the cumulative processing volume Q2 reading from the second electromagnetic flowmeter 21. The laboratory data for that shift shows the gold grade C1 for the precious solution and C2 for the lean solution. The cumulative metal content per shift is calculated in m. 金=(Q2-Q1)C1+Q1C2-Q2C2.

Claims

1. A zinc powder replacement system for deoxygenated lean liquor slurry preparation, wherein the top of the deoxygenation tower (2) is connected to the precious liquor tank (29) via the deoxygenation tower feed pipe (1), the lower end of the deoxygenation tower (2) is connected to the replacement pump feed pipe (17) via the deoxygenation tower discharge pipe (15), the other end of the replacement pump feed pipe (17) is connected to the feed end of the replacement pump (18), the discharge end of the replacement pump (18) is connected to the inlet end of the replacement cabinet (20) via the replacement cabinet feed pipe (19), the outlet end of the replacement cabinet (20) is connected to the lean liquor tank (25) via a second electromagnetic flow meter (21) and the replacement cabinet discharge pipe (22), and a zinc powder feeder (13) is installed above the mixing tank (12), characterized in that: The mixing tank (12) is connected to the level tank (11) via a pipeline; the top of the deoxygenation tower (2) is connected to the suction chamber of the ejector (4) via the ejector vacuum pipe (3), the liquid inlet end of the ejector (4) is connected to the lean liquid tank (25) via the ejector inlet pipe (6) and the ejector pump (9), and the diffuser pipe of the ejector (4) is connected to the lean liquid tank (25) via the ejector discharge pipe (5); the ejector inlet pipe (6) is connected to the inside of the level tank (11) via the level tank supply pipe (7) and the first electromagnetic flowmeter (8); the lower end of the mixing tank (12) is connected to the mixing tank discharge pipe ( 16) Connect the feed pipe (17) of the displacement pump; the drain pipe (22) of the displacement cabinet is connected to the precious liquid tank (29) through the circulation pipe (28) of the displacement cabinet; valves are installed on the pipes of the drain pipe (22) of the displacement cabinet, the circulation pipe (28) of the displacement cabinet, the liquid level tank supply pipe (7), the drain pipe (15) of the deoxygenation tower and the feed pipe (17) of the displacement pump respectively; valves are installed on the pipes between the jet pump (9) and the lean liquid tank (25), the pipes between the lean liquid pump (26) and the lean liquid tank (25) and the mixing tank (12) and the discharge pipe (16) of the mixing tank respectively.

2. The zinc powder replacement system for deoxygenated lean liquor slurry preparation as described in claim 1, characterized in that: The lean liquid tank (25) is equipped with a baffle (24) with an overflow space above it; the baffle (24) divides the lean liquid tank space into two parts: a lean liquid buffer tank (23) and a lean liquid discharge tank.

3. The zinc powder replacement system for deoxygenated lean liquor slurry preparation as described in claim 2, characterized in that: The feed end of the jet pump (9) is connected to the lean liquid buffer tank (23) via a pipeline.

4. The zinc powder replacement system for deoxygenated lean liquor slurry preparation as described in claim 2, characterized in that: The lean liquid discharge pool is connected to a lean liquid pump (26) via a pipeline equipped with an eighth valve (36), and the outlet end of the lean liquid pump (26) is connected to a lean liquid discharge pipe (27).

5. The zinc powder replacement system for deoxygenated lean liquor slurry preparation as described in claim 2, characterized in that: The outlet end of the displacement cabinet (20) is connected to the lean liquid buffer tank (23) through the second electromagnetic flow meter (21) and the displacement cabinet drain pipe (22); the diffuser of the ejector (4) is connected to the lean liquid discharge tank through the ejector discharge pipe (5).

6. The zinc powder replacement system for deoxygenated lean liquor preparation as described in any one of claims 1 to 5, characterized in that: The liquid level tank supply pipe (7) is located inside the liquid level tank (11) and is equipped with a float liquid level control mechanism (10) for controlling the liquid supply volume of the liquid level tank supply pipe (7).

7. The zinc powder replacement system for deoxygenated lean liquor slurry preparation as described in claim 6, characterized in that: The float level control mechanism (10) includes a butterfly valve (10-1) installed on the liquid supply pipe (7) of the liquid level tank; the butterfly valve plate (10-1-1) of the butterfly valve (10-1) is connected to a float (10-3) via a connecting rod (10-2).

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