A control system and method for simultaneous resin and liquid phase compaction transport and metering

Abstract

The present application relates to the technical field of uranium ore in-situ leaching, and particularly discloses a control system and method for synchronous compaction migration and metering of resin phase and liquid phase, wherein compressed air is introduced into an air chamber, a lower resin valve is opened, a piston is pushed to move downwards, and then the compaction resin in a resin chamber is pushed into a tower, so that the resin phase and the liquid phase are synchronously compacted and migrated in the tower; the displacement of the piston is monitored by a displacement sensor, the volume V of the resin into the tower is equal to L multiplied by pi d / 4, wherein d is the inner diameter of the resin chamber; when the volume V of the resin into the tower reaches a set value, the lower resin valve and the compressed air inlet are closed, and an emptying valve is opened, so that the resin migration is completed. 2 The present application can ensure the compact migration of the resin into the tower, solve the problem of misplacement of ion equilibrium concentration caused by the inconsistent migration speed of the resin phase and the liquid phase during the migration of the resin in the ion exchange tower, and reduce the influence of uneven supply of previous materials on the stable operation of the ion exchange tower.

Description

Technical Field

[0001] This invention belongs to the field of uranium leaching technology, specifically relating to a control system and method for the synchronous compaction and metering of resin phase and liquid phase. Background Technology

[0002] Ion exchange is a crucial component of post-treatment for leaching solutions in domestic in-situ leaching mines. During ion exchange, the resin bed and the contacting liquid phase reach a dynamic equilibrium. Depending on the process, the resin bed within the tower can be either stationary or intermittently moving during each ion exchange cycle. During tower operation, it is essential to maintain a dense resin bed to prevent backmixing and disruption of the target ion concentration within the resin layer.

[0003] Currently, the movement of the resin bed inside the tower is mainly achieved by gravity. Resin enters from the top of the tower, and the elevation difference between the inlet and outlet propels the resin to overcome pipe resistance. This method has the following drawbacks:

[0004] 1) Because the resin is more obstructed than the liquid phase in the tower and at the inlet and outlet, the resin phase and the liquid phase have different movement speeds in and out of the tower and in the tower. The liquid phase has a faster speed, which causes the equilibrium concentrations of the two phases to be misaligned, which is not conducive to the formation of a concentration enrichment section in the tower.

[0005] 2) To ensure the upper bed of the tower is compacted during transport, the resin exit speed should not be too fast;

[0006] 3) There needs to be a certain height difference between the resin inlet and outlet to ensure that the resin driving force generated by the height difference can overcome the resistance of the pipeline and outlet, so that the resin can move smoothly in the tower. This places higher demands on the design height of some special structure towers. Summary of the Invention

[0007] The purpose of this invention is to provide a control system and method for the synchronous compaction and metering of the resin phase and the liquid phase, so as to realize the synchronous movement of the resin phase and the liquid phase in the tower and pipeline.

[0008] The technical solution of the present invention is as follows:

[0009] A control system for the synchronous compaction and metering of resin phase and liquid phase includes a resin chamber and a resin storage tank.

[0010] The main bodies of the resin chamber and the resin storage tank are both cylindrical tanks;

[0011] The resin storage tank is provided with a resin and solution mixture inlet, an air outlet and a level gauge at the top, and an upper overflow outlet on the upper side wall of the resin storage tank.

[0012] A resin inlet is provided on the lower part of the side wall of the resin chamber, and a liquid inlet is machined below the resin inlet.

[0013] An overflow outlet is provided on the upper part of the side wall of the resin chamber for discharging the solution to ensure that the resin in the resin chamber is dense.

[0014] An air chamber is provided above the resin chamber, and an exhaust valve and a compressed air inlet are provided at the top of the air chamber. A piston is connected between the air chamber and the resin chamber.

[0015] A displacement sensor is provided on the piston rod of the piston;

[0016] The bottom of the resin storage tank is connected to the resin inlet on the side wall of the resin chamber via pipe A, and pipe A is controlled to open and close via an upper resin valve.

[0017] The bottom of the resin chamber is connected to the ion exchange tower via pipe B, and the opening and closing of pipe B is controlled by the lower resin valve.

[0018] The overflow port of the resin storage tank is connected to the upper liquid collection tank through pipe C, and the upper liquid collection tank is connected to the liquid inlet of the resin chamber through pipe D.

[0019] A solution pump is provided on the pipeline D to pump the solution in the upper collection tank into the resin chamber and drive the piston that has descended to the bottom of the resin chamber to reset.

[0020] The lower overflow port of the resin chamber is connected to the lower collection tank via pipe E, and the lower collection tank is connected to the top of the resin storage tank via pipe F.

[0021] A circulation pump is installed on the pipeline F, which can pump the solution in the lower collection tank back to the resin storage tank.

[0022] A graduated viewing window is provided on the side of the resin storage tank for observing the height of the resin layer inside the tank.

[0023] A lower pipeline is provided at the bottom of the upper liquid collection tank.

[0024] The bottoms of both the resin chamber and the resin storage tank are machined into funnel structures.

[0025] A method for synchronous compaction and metering of resin phase and liquid phase based on the control system includes the following steps:

[0026] Step 1: Close the drain valve, circulation pump, lower overflow port, lower resin valve, liquid inlet, upper resin valve, solution pump, and drain port; pass the saturated resin and adsorption stock solution produced in the adsorption process into the resin storage tank through the resin and solution mixture inlet, and let the excess adsorption stock solution flow out to the upper collection tank through the upper overflow port.

[0027] Step 2: Turn on the solution pump and the drain valve to inject the adsorbent stock solution in the upper collection tank into the resin chamber through pipeline D, thereby pushing the piston back to the top of the resin chamber, and then turn off the solution pump and the drain valve.

[0028] Step 3: Open the lower resin valve, upper resin valve and lower overflow port. The saturated resin in the resin storage tank flows into the resin chamber along with the adsorption solution through pipeline A and gradually accumulates on the resin layer of the ion exchange tower. At the same time, the adsorption solution flows out from the lower overflow port to the lower collection tank and is pumped back into the resin storage tank by the circulation pump, thereby ensuring that the liquid level in the resin storage tank is always higher than the resin level.

[0029] Step 4: Observe the resin level and scale in the resin storage tank through the graduated viewing window. When the resin level in the resin storage tank no longer drops, reduce the flow rate of the circulation pump and continue to run it for a period of time to make the saturated resin in the resin chamber fully compacted. Then close the circulation pump, the lower overflow port, the drain valve and the upper resin valve.

[0030] Step 5: Introduce compressed air into the gas chamber through the compressed air inlet, open the lower resin valve, push the piston downward, and then push the dense resin in the resin chamber into the tower. At this time, the resin phase and the liquid phase move synchronously and densely in the tower.

[0031] Step 6: Monitor the piston's movement distance L using a displacement sensor. The formula for calculating the resin volume V entering the tower is as follows:

[0032] V=L×πd 2 / 4,

[0033] Where d is the inner diameter of the resin chamber;

[0034] When the resin volume V entering the tower reaches the set value, close the lower resin valve and compressed air inlet, open the vent valve, and complete this resin transfer.

[0035] Step 7: Repeat steps 1 to 6 to achieve synchronous, dense, and continuous transport of the resin phase and the liquid phase.

[0036] In step 1, the volume ratio of the adsorption stock solution to the saturated resin is 1.2 to 2.2.

[0037] In step 1, the resin level in the resin storage tank is between 0.5 and 0.8 tanks.

[0038] In step 4, reduce the circulation pump flow rate to 8-12% of the original flow rate and continue running for 1-3 minutes.

[0039] In step 1, if the liquid level in the upper collection tank is too high, the solution will be discharged through the lower pipe at the bottom of the upper collection tank.

[0040] The significant advantages of this invention are:

[0041] 1) Ensure that the resin entering the tower can be transported in a compact manner;

[0042] 2) Ensure that air does not mix into the resin layer and enter the ion exchange tower;

[0043] 3) Overcome pipeline resistance and ensure resin transport within the long-pipeline ion exchange tower;

[0044] 4) Ensure constant velocity transport of the resin phase within the long-pipeline ion exchange tower;

[0045] 5) Solve the problem of misaligned ion equilibrium concentrations caused by inconsistent transport rates between the resin phase and the liquid phase during resin transport within the ion exchange tower;

[0046] 6) Reduce the impact of uneven supply of preceding materials on the stable operation of the ion exchange tower. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of a resin-liquid phase synchronous compaction transport system.

[0048] In the diagram: 1. Drain valve; 2. Gas chamber; 3. Piston; 4. Circulation pump; 5. Lower collection tank; 6. Lower overflow port; 7. Resin chamber; 8. Lower resin valve; 9. Inlet; 10. Upper resin valve; 11. Upper collection tank; 12. Solution pump; 13. Displacement sensor; 14. Resin storage tank; 15. Scaled viewing window; 16. Upper overflow port; 17. Drain port; 18. Level gauge. Detailed Implementation

[0049] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] like Figure 1 The control system shown includes a gas chamber 2, a piston 3, a circulating pump 4, a lower collection tank 5, a resin chamber 7, a lower resin valve 8, an upper resin valve 10, an upper collection tank 11, a solution pump 12, a displacement sensor 13, a resin storage tank 14, and a level gauge 18.

[0051] The main bodies of the resin chamber 7 and the resin storage tank 14 are both cylindrical tanks, and the bottoms are both machined into funnel structures.

[0052] The resin storage tank 14 is equipped with a resin and solution mixture inlet, an air drain 17, and a level gauge 18 at its top. An overflow outlet 16 is located on the upper side wall of the resin storage tank 14. The level gauge 18 is used to monitor the liquid level in the resin storage tank 14 in real time. A graduated viewing window 15 is provided on the side of the resin storage tank 14 for observing the height of the resin layer within the tank.

[0053] A resin inlet is provided on the lower part of the side wall of the resin chamber 7, and a liquid inlet 9 is machined below the resin inlet. A lower overflow outlet 6 is provided on the upper part of the side wall of the resin chamber 7 for discharging the solution to ensure that the resin in the resin chamber 7 is dense.

[0054] An air chamber 2 is located above the resin chamber 7. An air vent valve 1 and a compressed air inlet are located at the top of the air chamber 2. A piston 3 is connected between the air chamber 2 and the resin chamber 7. A displacement sensor 13 is located on the piston rod of the piston 3.

[0055] The bottom of the resin storage tank 14 is connected to the resin inlet on the side wall of the resin chamber 7 via pipe A, and pipe A is controlled to open and close via upper resin valve 10. The bottom of the resin chamber 7 is connected to the ion exchange tower via pipe B, and pipe B is controlled to open and close via lower resin valve 8.

[0056] The overflow port 16 of the resin storage tank 14 is connected to the upper collection tank 11 via pipe C, and the upper collection tank 11 is connected to the inlet 9 of the resin chamber 7 via pipe D. A solution pump 12 is installed on pipe D to pump the solution in the upper collection tank 11 into the resin chamber 7, driving the piston 3, which has descended to the bottom of the resin chamber 7, to reset. A lower pipe is provided at the bottom of the upper collection tank 11, through which the solution is discharged when the liquid level in the upper collection tank 11 is too high.

[0057] The lower overflow port 6 of the resin chamber 7 is connected to the lower collection tank 5 via pipe E, and the lower collection tank 5 is connected to the top of the resin storage tank 14 via pipe F. A circulation pump 4 is installed on the pipe F, which can pump the solution in the lower collection tank 5 back to the resin storage tank 14.

[0058] A method for simultaneous compact transport and metering of resin phase and liquid phase includes the following steps:

[0059] Step 1: Close the drain valve 1, circulation pump 4, lower overflow port 6, lower resin valve 8, liquid inlet 9, upper resin valve 10, solution pump 12, and drain port 17; introduce the saturated resin and adsorption stock solution produced in the adsorption process into the resin storage tank 14 through the resin and solution mixture inlet. The volume ratio of adsorption stock solution to saturated resin is 1.2 to 2.2. The resin liquid level in the resin storage tank 14 is between 0.5 and 0.8 tanks. Excess adsorption stock solution flows out from the upper overflow port 16 to the upper collection tank 11. If the liquid level in the upper collection tank 11 is too high, it is discharged through the lower pipe at the bottom of the upper collection tank 11.

[0060] Step 2: Turn on the solution pump 12 and the drain valve 1 to inject the adsorption stock solution in the upper collection tank 11 into the resin chamber 7 through the pipeline D, thereby pushing the piston 3 to return to the top of the resin chamber 7, and then turn off the solution pump 12 and the drain valve 1.

[0061] Step 3: Open the lower resin valve 8, the upper resin valve 10 and the lower overflow port 6. The saturated resin in the resin storage tank 14 flows into the resin chamber 7 along with the adsorption solution through the pipeline A and gradually accumulates on the resin layer of the ion exchange tower. At the same time, the adsorption solution flows out from the lower overflow port 6 to the lower collection tank 5 and is pumped back into the resin storage tank 14 by the circulation pump 4, thereby ensuring that the liquid level in the resin storage tank 14 is always higher than the resin level.

[0062] Step 4: Observe the resin level and scale in the resin storage tank 14 through the graduated viewing window 15. When the resin level in the resin storage tank 14 no longer drops, reduce the flow rate of the circulation pump 4 to 10% of the original flow rate and continue to run for 2 minutes to make the saturated resin in the resin chamber 7 fully compacted. Then close the circulation pump 4, the lower overflow port 6, the drain valve 1 and the upper resin valve 10.

[0063] Step 5: Introduce compressed air into the air chamber 2 through the compressed air inlet, open the lower resin valve 8, push the piston 3 downward, and then push the dense resin in the resin chamber 7 into the tower. At this time, the resin phase and the liquid phase move synchronously and densely in the tower.

[0064] Step 6: Monitor the moving distance L of piston 3 using displacement sensor 13. The formula for calculating the resin volume V entering the tower is as follows:

[0065] V=L×πd 2 / 4,

[0066] Where d is the inner diameter of resin chamber 7;

[0067] When the resin volume V entering the tower reaches the set value, close the lower resin valve 8 and the compressed air inlet, and open the vent valve 1 to complete this resin transfer.

[0068] Step 7: Repeat steps 1 to 6 to achieve synchronous, dense, and continuous transport of the resin phase and the liquid phase.

Claims

1. A control system for the synchronous compact transport and metering of resin phase and liquid phase, characterized in that: It includes a resin chamber (7) and a resin storage tank (14); The main bodies of the resin chamber (7) and the resin storage tank (14) are both cylindrical tanks; The resin storage tank (14) is provided with a resin and solution mixture inlet, an air vent (17) and a level gauge (18) at the top, and an upper overflow port (16) is provided on the upper side wall of the resin storage tank (14). A resin inlet is provided on the lower part of the side wall of the resin chamber (7), and a liquid inlet (9) is machined below the resin inlet; An overflow port (6) is provided on the upper side wall of the resin chamber (7) to discharge the solution, so as to ensure that the resin in the resin chamber (7) is dense; A gas chamber (2) is provided above the resin chamber (7). An exhaust valve (1) and a compressed air inlet are provided at the top of the gas chamber (2). A piston (3) is connected between the gas chamber (2) and the resin chamber (7), thereby pushing the dense resin in the resin chamber (7) into the long pipeline ion exchange tower. At this time, the resin phase and the liquid phase move synchronously and densely in the long pipeline ion exchange tower. A displacement sensor (13) is provided on the piston rod of the piston (3); The bottom of the resin storage tank (14) is connected to the resin inlet on the side wall of the resin chamber (7) via pipe A, and pipe A is controlled to open and close via upper resin valve (10). The bottom of the resin chamber (7) is connected to the long pipeline ion exchange tower via pipeline B, and pipeline B is controlled to open and close via the lower resin valve (8). The overflow port (16) of the resin storage tank (14) is connected to the upper liquid collection tank (11) through pipe C, and the upper liquid collection tank (11) is connected to the liquid inlet (9) of the resin chamber (7) through pipe D. A solution pump (12) is provided on the pipeline D to pump the solution in the upper collection tank (11) into the resin chamber (7) and drive the piston (3) that has descended to the bottom of the resin chamber (7) to reset. The lower overflow port (6) of the resin chamber (7) is connected to the lower collection tank (5) through pipe E, and the lower collection tank (5) is connected to the top of the resin storage tank (14) through pipe F. A circulation pump (4) is provided on the pipeline F, which can pump the solution in the lower collection tank (5) back to the resin storage tank (14).

2. The control system for synchronous compact transport and metering of resin phase and liquid phase as described in claim 1, characterized in that: A graduated viewing window (15) is provided on the side of the resin storage tank (14) for observing the height of the resin layer in the resin storage tank (14).

3. The control system for synchronous compact transport and metering of resin phase and liquid phase as described in claim 2, characterized in that: A lower pipeline is provided at the bottom of the upper liquid collection tank (11).

4. The control system for synchronous compact transport and metering of resin phase and liquid phase as described in claim 3, characterized in that: The bottoms of the resin chamber (7) and the resin storage tank (14) are both machined into funnel structures.

5. A method for synchronous compaction and metering of resin phase and liquid phase based on the control system described in claim 3, characterized in that: Includes the following steps: Step 1: Close the drain valve (1), circulation pump (4), lower overflow port (6), lower resin valve (8), liquid inlet (9), upper resin valve (10), solution pump (12), and drain port (17); saturated resin and adsorption stock solution produced in the adsorption process are introduced into the resin storage tank (14) through the resin and solution mixture inlet, and excess adsorption stock solution flows out from the upper overflow port (16) to the upper collection tank (11); Step 2: Turn on the solution pump (12) and the drain valve (1) to inject the adsorbent stock solution in the upper collection tank (11) into the resin chamber (7) through the pipeline D, thereby pushing the piston (3) to reset to the top of the resin chamber (7), and then turn off the solution pump (12) and the drain valve (1). Step 3: Open the lower resin valve (8), upper resin valve (10) and lower overflow port (6). The saturated resin in the resin storage tank (14) flows into the resin chamber (7) along with the adsorption solution through pipeline A and gradually accumulates on the resin layer of the long pipeline ion exchange tower. At the same time, the adsorption solution flows out from the lower overflow port (6) to the lower collection tank (5) and is pumped back into the resin storage tank (14) by the circulation pump (4), thereby ensuring that the liquid level in the resin storage tank (14) is always higher than the resin level. Step 4: Observe the resin surface and scale in the resin storage tank (14) through the graduated viewing window (15). When the resin surface in the resin storage tank (14) no longer drops, reduce the flow rate of the circulation pump (4) and continue to run for a period of time to make the saturated resin in the resin chamber (7) fully compacted. Then close the circulation pump (4), the lower overflow port (6), the drain valve (1) and the upper resin valve (10). Step 5: Compressed air is introduced into the air chamber (2) through the compressed air inlet, the lower resin valve (8) is opened, the piston (3) is pushed down, and the dense resin in the resin chamber (7) is pushed into the long pipeline ion exchange tower. At this time, the resin phase and the liquid phase move synchronously and densely in the long pipeline ion exchange tower. Step 6: Monitor the moving distance L of piston (3) using displacement sensor (13). The formula for calculating the resin volume V in the long pipeline ion exchange tower is as follows: V = L × πd² / 4, Where d is the inner diameter of the resin chamber (7); When the resin volume V entering the long pipeline ion exchange tower reaches the set value, close the lower resin valve (8) and the compressed air inlet, open the vent valve (1), and complete this resin transfer. Step 7: Repeat steps 1 to 6 to achieve synchronous, dense, and continuous transport of the resin phase and the liquid phase.

6. The method for simultaneous compact transport and metering of resin phase and liquid phase as described in claim 5, characterized in that: In step 1, the volume ratio of the adsorption stock solution to the saturated resin is 1.2 to 2.

2.

7. The method for simultaneous compact transport and metering of resin phase and liquid phase as described in claim 6, characterized in that: In step 1, the resin level in the resin storage tank (14) is between 0.5 and 0.8 tanks.

8. The method for simultaneous compact transport and metering of resin phase and liquid phase as described in claim 7, characterized in that: In step 4, reduce the flow rate of the circulating pump (4) to 8-12% of the original flow rate and continue running for 1-3 minutes.

9. The method for simultaneous compact transport and metering of resin phase and liquid phase as described in claim 8, characterized in that: In step 1, if the liquid level in the upper collection tank (11) is too high, the solution is discharged through the lower pipe at the bottom of the upper collection tank (11).

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