A hydrometallurgical pre-neutralization real-time control system and method

Abstract

The present invention relates to a real-time control system and method for pre-neutralization in hydrometallurgy. The system comprises a pre-neutralization tank, a countercurrent washer and thickener, a detection tank, and a control device. The pre-neutralization tank is connected to the countercurrent washer and thickener via a slurry discharge pipe. The detection tank is connected to the slurry discharge pipe and the washing water inlet pipe of the countercurrent washer and thickener via a first detection pipe and a second detection pipe, respectively. The detection tank has a flocculant injector. The control device is used to obtain a flocculation and sedimentation effect signal in the detection tank and adjust the discharge flow rate of the slurry discharge pipe based on the flocculation and sedimentation effect signal. The real-time control system is provided with a detection tank between the pre-neutralization tank and the countercurrent washer and thickener. The pre-neutralized slurry and washing water are input into the detection tank. The control device detects the flocculation and sedimentation effect and timely adjusts the input flow rate of the pre-neutralized slurry based on the sedimentation effect, so that the pre-neutralized slurry maintains a good sedimentation effect during countercurrent washing.

Description

Technical Field

[0001] The present invention relates to the technical field of laterite nickel ore hydrometallurgy, and in particular to a hydrometallurgy pre-neutralization real-time control system and method. Background Art

[0002] Currently, in the hydrometallurgical process of laterite nickel ore, the slurry after high-pressure leaching must be pre-neutralized to ensure effective solid-liquid separation in the subsequent countercurrent washing process. Due to factors such as different batches of laterite nickel ore, adjustments to the front-end processing steps, and differences in actual reactions, the slurry after pre-neutralization at different time periods cannot be exactly the same. This often results in poor flocculation and settling of the pre-neutralized slurry when entering the first stage of countercurrent washing, which in turn affects the solid-liquid separation of the entire multi-stage countercurrent washing process.

[0003] In the existing technology, the pre-neutralized slurry and wash water from the primary countercurrent wash are manually pumped out on-site at regular intervals, mixed and flocculated in the laboratory, and the flow rate of the pre-neutralized slurry entering the countercurrent wash is manually adjusted based on the actual mixing and flocculation results. However, this method is time-consuming and has a lag effect, making timely adjustments difficult. Summary of the Invention

[0004] In view of this, it is necessary to provide a hydrometallurgical pre-neutralization real-time control system and method to solve the technical problem in the existing technology that detection takes a long time and leads to untimely adjustment.

[0005] The present invention provides a real-time control system for pre-neutralization of hydrometallurgy, which comprises: a pre-neutralization tank, a countercurrent washing and thickening machine, a detection tank and a control device. The pre-neutralization tank is connected to the countercurrent washing and thickening machine through a slurry discharge pipe, the detection tank is connected to the slurry discharge pipe and the washing water inlet pipe of the countercurrent washing and thickening machine through a first detection pipe and a second detection pipe respectively, the detection tank is provided with a flocculant injector, and the control device is used to obtain a flocculation and sedimentation effect signal in the detection tank and adjust the discharge flow of the slurry discharge pipe according to the flocculation and sedimentation effect signal.

[0006] Furthermore, a first flow meter and a first valve are provided on the first detection tube, and a second flow meter and a second valve are provided on the second detection tube. The control device is used to obtain the first flow signal and the second flow signal of the first flow meter and the second flow meter respectively, and control the opening of the first valve and the second valve according to the preset slurry and washing water ratio, the first flow signal and the second flow signal.

[0007] Furthermore, a spare tank is included, and the feed end and the discharge end of the spare tank are connected to the slurry discharge pipe through the first diversion pipe and the second diversion pipe respectively.

[0008] Furthermore, a third flow meter and a third valve are provided on the first diversion pipe, and a metering pump is provided on the second diversion pipe. The discharge flow rate of the slurry discharge pipe is adjusted according to the flocculation and sedimentation effect signal, including: obtaining the flocculation and sedimentation effect signal, judging whether the flocculation and sedimentation effect signal is greater than the first threshold value, and if so, determining confluence, and controlling the metering pump to input the slurry of the corresponding flow rate into the slurry discharge pipe according to the difference between the flocculation and sedimentation effect signal and the first threshold value; judging whether the flocculation and sedimentation effect signal is less than the second threshold value, and if so, determining diversion, and controlling the opening degree of the third valve according to the flow rate corresponding to the difference between the second threshold value and the flocculation and sedimentation effect signal and the flow signal detected by the third flow meter; if the flocculation and sedimentation effect signal is between the second threshold value and the first threshold value, controlling the third valve to close and the metering pump to stop working.

[0009] Furthermore, the detection tank is also connected to the countercurrent washing and thickening machine through a discharge pipe, and a fourth valve is provided on the discharge pipe.

[0010] Furthermore, the control device includes a mud layer detector and a solid content detector. The mud layer detector is used to detect the mud layer height in the detection tank after the flocculation and sedimentation set time, and the solid content detector is used to detect the solid content in the pre-neutralized ore slurry. The device is used to obtain the flocculation and sedimentation effect signal in the detection tank, including: obtaining a first signal of the mud layer height and a second signal of the solid content, and determining the flocculation and sedimentation effect signal based on the ratio of the first signal to the second signal.

[0011] The present invention provides a real-time control method for hydrometallurgical pre-neutralization of laterite nickel ore. The real-time control method for hydrometallurgical pre-neutralization of laterite nickel ore adopts a hydrometallurgical pre-neutralization real-time control system, comprising the following steps: pre-neutralized ore pulp and washing water are respectively input into a detection tank through a first detection tube and a second detection tube, a certain amount of flocculant is added into the detection tank through a flocculant injector, a flocculation and sedimentation effect signal in the detection tank is detected by a control device after a set time, and the discharge flow rate of a slurry discharge pipe is adjusted according to the flocculation and sedimentation effect signal.

[0012] In some embodiments, the ratio of the flow rate of the pre-neutralized slurry in the first detection tube to the flow rate of the washing water in the second detection tube is the same as the ratio of the flow rate of the pre-neutralized slurry in the slurry discharge pipe to the flow rate of the washing water in the washing water inlet pipe.

[0013] In some embodiments, after the control device completes the detection, the mixed liquid in the detection tank is transported to a countercurrent washing and thickening machine, and washing water is introduced into the detection tank via a second detection tube to clean the detection tank.

[0014] In some embodiments, when the input flow rate of the pre-neutralized slurry needs to be reduced, the first diversion pipe is opened to allow part of the pre-neutralized slurry to flow into the standby tank; when the input flow rate of the pre-neutralized slurry needs to be increased, the second diversion pipe is opened to allow the pre-neutralized slurry in the standby tank to flow into the countercurrent washing thickener.

[0015] Compared with the existing technology, the hydrometallurgical pre-neutralization real-time control system provided by the present invention is equipped with a detection tank between the pre-neutralization tank and the countercurrent washing thickener. The pre-neutralized slurry and washing water are input into the detection tank, and a control device is used to detect the flocculation and sedimentation effect. The input flow rate of the pre-neutralized slurry is adjusted in time according to the sedimentation effect, so that the pre-neutralized slurry maintains a good sedimentation effect during countercurrent washing, eliminating the negative impact caused by the instability of the pre-neutralized slurry.

[0016] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the description, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. The specific implementation methods of the present invention are given in detail by the following embodiments and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic structural diagram of a preferred embodiment of the hydrometallurgical pre-neutralization and real-time control system provided by the present invention;

[0019] Figure 2 The present invention provides a flow chart of the real-time control method for pre-neutralization of laterite nickel ore hydrometallurgy.

[0020] In the picture:

[0021] 1. Pre-neutralization tank;

[0022] 2. Countercurrent washing thickener;

[0023] 3. Detection tank;

[0024] 4. Control device; 41. Mud layer detector; 42. Solid content detector;

[0025] 51. Slurry discharge pipe; 52. First detection pipe; 53. Second detection pipe; 54. Washing water inlet pipe; 55. First diversion pipe; 56. Second diversion pipe; 57. Discharge pipe;

[0026] 61. First flow meter; 62. Second flow meter; 63. Third flow meter;

[0027] 71, first valve; 72, second valve; 73, third valve; 74, fourth valve;

[0028] 8. Spare tank;

[0029] 9. Metering pump. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0031] See Figure 1 The present invention provides a real-time control system for pre-neutralization in hydrometallurgy. This system is used in the countercurrent washing process in metallurgical production to match the input flow of pre-neutralized slurry with the wash water and flocculant to achieve optimal flocculation and sedimentation effects.

[0032] It should be noted that the hydrometallurgical pre-neutralization and real-time control system of the present invention is used, but not limited to, laterite nickel ore hydrometallurgy. It can also be applied to other production activities requiring countercurrent washing. In this invention, the application of the hydrometallurgical pre-neutralization and real-time control system to laterite nickel ore hydrometallurgy is used as an example for illustration. However, the principles of application to other production processes are essentially the same as those used in laterite nickel ore hydrometallurgy, and therefore will not be elaborated on here.

[0033] This hydrometallurgical pre-neutralization real-time control system includes a pre-neutralization tank 1, a countercurrent washer and thickener 2, a detection tank 3, and a control device 4. The pre-neutralization tank 1 is used for the slurry neutralization reaction within it. When multi-stage pre-neutralization is employed, the pre-neutralization tank 1 in this embodiment can be the tank where the final neutralization reaction occurs. The pre-neutralization tank 1 is connected to the countercurrent washer and thickener 2 via a slurry discharge pipe 51. When multi-stage countercurrent washing is employed, the countercurrent washer and thickener 2 in this embodiment can be the first-stage thickener. The detection tank 3 is connected to the slurry discharge pipe 51 and the washing water inlet pipe 54 of the countercurrent washer and thickener 2 via a first detection pipe 52 and a second detection pipe 53, respectively. The detection tank 3 has a flocculant dispenser for adding a certain amount of flocculant to the detection tank 3. The flocculant dispenser can be a flow-controlled filling pipe or a graduated container that is pre-filled with a certain amount of flocculant before adding it to the detection tank 3. The control device 4 is used to obtain the flocculation and sedimentation effect signal in the detection tank 3 and adjust the discharge flow rate of the slurry discharge pipe 51 according to the flocculation and sedimentation effect signal. That is, in this embodiment, the slurry, washing water and flocculant are input into the detection tank 3 according to the actual reaction ratio to fully mix and cause flocculation and sedimentation. The control device 4 detects the result of flocculation and sedimentation and forms a flocculation and sedimentation effect signal. At the same time, the discharge flow rate of the slurry discharge pipe 51 is adjusted according to the flocculation and sedimentation effect signal, so that the slurry discharge flow rate matches the washing water flow rate and the flocculant addition amount, thereby ensuring the flocculation and sedimentation effect in the washing thickener 2.

[0034] It is easy to understand that the flow of liquids such as pre-neutralized slurry and washing water can be driven by height difference, the liquid's own pressure, or an external driving force provided by a pump. Accordingly, components such as the pre-neutralization tank 1, countercurrent washing thickener 2, and detection tank 3 are placed at appropriate heights, or pumps are installed on the corresponding pipelines to drive the flow.

[0035] This system introduces the pre-neutralized slurry and washing water into the detection tank 3 through the first detection tube 52 and the second detection tube 53 respectively, and uses the control device 4 to detect the flocculation and sedimentation effect. The input flow of the pre-neutralized slurry is adjusted in time according to the sedimentation effect, so that the pre-neutralized slurry maintains a good sedimentation effect during countercurrent washing in the countercurrent washing thickener 2, eliminating the negative impact of the instability of the pre-neutralized slurry.

[0036] In some embodiments, the control device 4 includes a mud layer detector 41 and a solid content detector 42. The mud layer detector 41 is located below the detection tank 3 and is used to detect the mud layer height within the detection tank 3 after a set period of flocculation and sedimentation. The solid content detector 42 is located above the detection tank 3 and is used to detect the solids content in the pre-neutralized slurry. The mud layer detector 41 detects the mud layer height and generates a first signal, while the solid content detector 42 detects the solids content and generates a second signal. The flocculation and sedimentation effect signal is determined by the ratio of the first and second signals.

[0037] In some embodiments, the first detection tube 52 is provided with a first flowmeter 61 and a first valve 71, and the second detection tube 53 is provided with a second flowmeter 62 and a second valve 72. The first flowmeter 61 and the second flowmeter 62 are used to detect the flow rates of the pre-neutralized slurry and wash water in the first detection tube 52 and the second detection tube 53, respectively. The control device 4 can obtain the first flow signal and the second flow signal from the first flowmeter 61 and the second flowmeter 62, respectively, and control the opening of the first valve 71 and the second valve 72 based on the preset slurry-to-wash water ratio and the first flow signal and the second flow signal. This can control the flow rates of the pre-neutralized slurry and wash water, ensuring that the flow rate ratio of the pre-neutralized slurry to wash water in the first detection tube 52 and the second detection tube 53 is the same as the flow rate ratio of the pre-neutralized slurry to wash water in the slurry discharge pipe 51 and the wash water inlet pipe 54. This ensures that the ratio of the pre-neutralized slurry, wash water, and flocculant extracted from the detection tank 3 is the same as that in the countercurrent washer thickener 2, thereby ensuring that the detection results are consistent with the actual conditions within the countercurrent washer thickener 2.

[0038] In some embodiments, the system further includes a standby tank 8, which is connected to the slurry discharge pipe 51 and the countercurrent washer thickener 2 via a first shunt pipe 55 and a second shunt pipe 56, respectively. The pre-neutralized slurry input flow rate to the countercurrent washer thickener 2 is adjusted based on the flocculation and sedimentation results in the detection tank 3. When the pre-neutralized slurry input needs to be reduced, a portion of the slurry in the slurry discharge pipe 51 is directed to the standby tank 8 via the first shunt pipe 55 for temporary storage. When the pre-neutralized slurry input needs to be increased, the pre-neutralized slurry in the standby tank 8 is directed to the countercurrent washer thickener 2 via the second shunt pipe 56, thereby adjusting the pre-neutralized slurry input flow rate.

[0039] In a preferred embodiment, the first diversion pipe 55 is equipped with a third flowmeter 63 and a third valve 73, and the second diversion pipe 56 is equipped with a metering pump 9. Similar to other flowmeters and valves, the opening of the third valve 73 is controlled to control the flow rate of the pre-neutralized slurry flowing through the first diversion pipe 55, thereby quantitatively reducing the pre-neutralized slurry input. The metering pump 9 can pump the pre-neutralized slurry from the backup tank 8 into the countercurrent washer-thickener 2 at a set flow rate, thereby quantitatively increasing the pre-neutralized slurry input. In other embodiments, a similar flowmeter and valve combination can be used in place of the metering pump 9, while utilizing height differences as the flow force for the pre-neutralized slurry.

[0040] In a preferred embodiment, the detection tank 3 is also connected to the countercurrent washer-thickener 2 via a discharge pipe 57, which is provided with a fourth valve 74. After the detection tank 3 completes the test, the fourth valve 74 is opened to transfer the mixed liquid of the pre-neutralized slurry, wash water, and flocculant back to the countercurrent washer-thickener 2 through the discharge pipe 57 to recover the pre-neutralized slurry for testing.

[0041] See Figure 2 The present invention also provides a real-time control method for pre-neutralization of laterite nickel ore hydrometallurgical process. The method utilizes the aforementioned system and includes the following steps: introducing pre-neutralized slurry and washing water into a detection tank 3 via a first detection tube 52 and a second detection tube 53, respectively; injecting a certain amount of flocculant into the detection tank 3 via a flocculant injector; and utilizing the impact force of the pre-neutralized slurry and washing water as they enter the detection tank 3 to uniformly mix them. After a certain amount of pre-neutralized slurry and washing water have been introduced, the first detection tube 52 and the second detection tube 53 are closed.

[0042] After a preset time, the control device 4 is used to detect the flocculation and sedimentation conditions in the detection tank 3. When the sedimentation effect is good, the input flow rate of the pre-neutralized slurry to the countercurrent washer thickener 2 is increased; when the sedimentation effect is normal, the input flow rate of the pre-neutralized slurry is maintained unchanged; when the sedimentation effect is poor, the input flow rate of the pre-neutralized slurry to the countercurrent washer thickener 2 is reduced.

[0043] Specifically, in this embodiment, the mud layer detector 41 detects the height of the mud layer after flocculation and sedimentation, generating a first signal A. The solid content detector 42 detects the solid content in the pre-neutralized slurry, generating a second signal B. The flocculation and sedimentation effect signal C = A / B. As can be easily understood, the more complete the flocculation and sedimentation, the higher the mud layer at the bottom, i.e., the greater A. The lower the solid content in the upper layer, i.e., the smaller B. Therefore, a larger value of C indicates more complete flocculation and sedimentation.

[0044] At the same time, a first threshold value D and a second threshold value E are preset. When E≤C≤D, it indicates that the sedimentation effect is normal and the input flow rate of the pre-neutralized slurry is kept unchanged. When C>D, it indicates that the sedimentation effect is good and confluence is determined. It is necessary to increase the input flow rate of the pre-neutralized slurry so that C is reduced to between D and E. The metering pump 9 is controlled to input the corresponding flow rate of slurry into the slurry discharge pipe 51 according to the difference between the flocculation sedimentation effect signal and the first threshold value D. When C is less than E, it indicates that the sedimentation effect is poor and diversion is determined. It is necessary to reduce the input flow rate of the pre-neutralized slurry so that C is reduced to between D and E. The opening degree of the third valve 73 is controlled according to the flow rate corresponding to the difference between the second threshold value E and the flocculation sedimentation effect signal and the flow signal detected by the third flowmeter 63, so that the slurry of the rated flow rate is diverted to the standby tank 8.

[0045] When adjusting the input flow of the pre-neutralized slurry, you can estimate an adjustment value, then conduct a test, and then use the test results to guide the next adjustment. Through multiple adjustments, the C value can be brought between D and E. Some experienced users can adjust the C value to between D and E in one step based on the difference between the C value and the D value or the E value.

[0046] In some embodiments, the ratio of the flow rate of the pre-neutralized slurry in the first detection tube 52 to the flow rate of the washing water in the second detection tube 53 is the same as the ratio of the flow rate of the pre-neutralized slurry in the slurry discharge pipe 51 to the flow rate of the washing water in the washing water inlet pipe 54. This ensures that the ratio of the pre-neutralized slurry, washing water, and flocculant extracted from the detection tank 3 is the same as that in the countercurrent washer thickener 2, so that the detection results are consistent with the actual situation in the countercurrent washer thickener 2.

[0047] In a preferred embodiment, when introducing pre-neutralized slurry and wash water through first and second detection tubes 52 and 53, fourth valve 74 can be opened before adjusting first and second valves 71 and 72 to the desired flow rates. This prevents significant experimental errors caused by introducing pre-neutralized slurry and wash water at an incorrect ratio during adjustment. Once the input flow rates are adjusted to the desired values ​​and stabilize, fourth valve 74 is closed, and a predetermined amount of flocculant is added for the experiment.

[0048] In some embodiments, after the control device 4 completes testing, the fourth valve 74 is opened to transfer the mixed liquid in the test tank 3 to the countercurrent washer-thickener 2 to recover the pre-neutralized slurry for testing. The second valve 72 is then opened, and washing water is introduced into the test tank 3 via the second test tube 53 to clean the test tank 3, thereby preventing residual substances from the previous test from affecting the results of the next test.

[0049] In some embodiments, when the input flow rate of the pre-neutralized slurry needs to be reduced, the first shunt pipe 55 is opened to allow part of the pre-neutralized slurry to flow into the standby tank 8. When the input flow rate of the pre-neutralized slurry needs to be increased, the second shunt pipe 56 is opened, or the metering pump 9 is started to allow the pre-neutralized slurry in the standby tank 8 to flow into the slurry discharge pipe 51, thereby adjusting the input amount of the pre-neutralized slurry.

[0050] In some embodiments, when it is necessary to increase or decrease the input flow rate of the pre-neutralized slurry, the output flow rate of the pre-neutralized slurry can also be directly adjusted to avoid the spare tank 8 being full of slurry, resulting in the inability to divert the pre-neutralized slurry in the slurry discharge pipe 51 and reduce the input flow rate of the pre-neutralized slurry, or to avoid the spare tank 8 having no slurry or less slurry, resulting in the inability to replenish the pre-neutralized slurry in the slurry discharge pipe 51 and increase the input flow rate of the pre-neutralized slurry.

[0051] In some embodiments, since the input flow rate of the pre-neutralized slurry is not constant and the contents of the components in the slurry vary over time, in order to maintain a consistently good flocculation and sedimentation condition of the pre-neutralized slurry, washing water is introduced into the detection tank 3 via the second detection tube 53. After cleaning the detection tank 3, the detection tank 3 is used to perform a test at regular intervals, and the discharge flow rate of the slurry discharge pipe 51 is adjusted based on the flocculation and sedimentation effect signal from the detection tank 3.

[0052] Compared with the existing technology, the hydrometallurgical pre-neutralization real-time control system provided by the present invention is equipped with a detection tank between the pre-neutralization tank and the countercurrent washing thickener. The pre-neutralized slurry and washing water are input into the detection tank, and a control device is used to detect the flocculation and sedimentation effect. The input flow rate of the pre-neutralized slurry is adjusted in time according to the sedimentation effect, so that the pre-neutralized slurry maintains a good sedimentation effect during countercurrent washing, eliminating the negative impact caused by the instability of the pre-neutralized slurry.

[0053] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A hydrometallurgical pre-neutralization real-time control system, characterized in that: It includes: A pre-neutralization tank, a countercurrent washing and thickening machine, a detection tank, a control device and a standby tank, wherein the pre-neutralization tank is connected to the countercurrent washing and thickening machine through a slurry discharge pipe, and the detection tank is connected to the slurry discharge pipe and the washing water inlet pipe of the countercurrent washing and thickening machine through a first detection pipe and a second detection pipe respectively. The detection tank has a flocculant injector, and the feed end and the discharge end of the standby tank are connected to the slurry discharge pipe through a first diversion pipe and a second diversion pipe respectively. The first diversion pipe is provided with a third flowmeter and a third valve, and the second diversion pipe is provided with a metering pump. The control device is used to obtain a flocculation and sedimentation effect signal in the detection tank and adjust the discharge flow of the slurry discharge pipe according to the flocculation and sedimentation effect signal. Adjusting the discharge flow of the slurry discharge pipe according to the flocculation and sedimentation effect signal includes: Obtaining a flocculation and sedimentation effect signal, determining whether the flocculation and sedimentation effect signal is greater than a first threshold, and if so, determining confluence, and controlling the metering pump to input a corresponding flow of slurry into the slurry discharge pipe according to the difference between the flocculation and sedimentation effect signal and the first threshold; Determine whether the flocculation and sedimentation effect signal is less than a second threshold value, if so, determine to divert the flow, and control the opening degree of the third valve according to the flow corresponding to the difference between the second threshold value and the flocculation and sedimentation effect signal and the flow signal detected by the third flow meter; If the flocculation sedimentation effect signal is between the second threshold value and the first threshold value, the third valve is controlled to close and the metering pump stops working.

2. The hydrometallurgical pre-neutralization real-time control system according to claim 1, characterized in that: A first flow meter and a first valve are provided on the first detection tube, and a second flow meter and a second valve are provided on the second detection tube. The control device is used to obtain first flow signals and second flow signals from the first flow meter and the second flow meter, respectively, and control the opening of the first valve and the second valve according to a preset ratio of slurry to washing water, the first flow signal and the second flow signal.

3. The hydrometallurgical pre-neutralization real-time control system according to claim 1, characterized in that: The detection tank is also connected to the countercurrent washing and thickening machine through a discharge pipe, and a fourth valve is provided on the discharge pipe.

4. The hydrometallurgical pre-neutralization real-time control system according to claim 1, characterized in that: The control device includes a mud layer detector and a solid content detector. The mud layer detector is used to detect the mud layer height in the detection tank after flocculation and sedimentation for a set time. The solid content detector is used to detect the solid content in the pre-neutralized slurry. The method for obtaining the flocculation and sedimentation effect signal in the detection tank includes: obtaining a first signal of the mud layer height and a second signal of the solid content, and determining the flocculation and sedimentation effect signal based on the ratio of the first signal to the second signal.

5. A hydrometallurgical pre-neutralization real-time control method, characterized in that: It adopts the hydrometallurgical pre-neutralization real-time control system as described in any one of claims 1 to 4, which includes the following steps: inputting pre-neutralized slurry and washing water into the detection tank through the first detection tube and the second detection tube respectively, adding a certain amount of flocculant into the detection tank through the flocculant injector, using the control device to detect the flocculation and sedimentation effect signal in the detection tank after a set time, and adjusting the discharge flow of the slurry discharge pipe according to the flocculation and sedimentation effect signal.

6. The hydrometallurgical pre-neutralization real-time control method according to claim 5, characterized in that: The ratio of the flow rate of the pre-neutralized slurry in the first detection tube to the flow rate of the washing water in the second detection tube is the same as the ratio of the flow rate of the pre-neutralized slurry in the slurry discharge pipe to the flow rate of the washing water in the washing water inlet pipe.

7. The hydrometallurgical pre-neutralization real-time control method according to claim 5, characterized in that: After the control device completes the detection, the mixed liquid in the detection tank is transported to the countercurrent washing and thickening machine, and washing water is introduced into the detection tank through the second detection pipe to clean the detection tank.

8. The hydrometallurgical pre-neutralization real-time control method according to claim 5, characterized in that: When the input flow of the pre-neutralized slurry needs to be reduced, the first diversion pipe is opened to allow part of the pre-neutralized slurry to flow into the standby tank; when the input flow of the pre-neutralized slurry needs to be increased, the second diversion pipe is opened to allow the pre-neutralized slurry in the standby tank to flow into the countercurrent washing thickener.

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