Wet metallurgy pre-neutralization real-time regulation and control system and method

Abstract

The invention relates to a wet metallurgy pre-neutralization real-time regulation and control system and method.The system comprises a pre-neutralization tank, a countercurrent washing thickener, a detection tank and a regulation and control device, and the pre-neutralization tank is communicated with the countercurrent washing thickener through an ore pulp discharging pipe; the detection tank is respectively communicated with an ore pulp discharge pipe and a washing water inlet pipe of the countercurrent washing thickener through a first detection pipe and a second detection pipe, the detection tank is provided with a flocculating agent filling device, and the regulation and control device is used for acquiring a flocculating settling effect signal in the detection tank and regulating the discharge flow of the ore pulp discharge pipe according to the flocculating settling effect signal. According to the real-time regulation and control system, the detection tank is arranged between the pre-neutralization tank and the countercurrent washing thickener, pre-neutralized ore pulp and washing water are input into the detection tank, the flocculation sedimentation effect is detected by using the regulation and control device, and the input flow of the pre-neutralized ore pulp is regulated in time according to the sedimentation effect, so that the pre-neutralized ore pulp keeps a better sedimentation effect during countercurrent washing.

Description

Technical Field

[0001] The 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] At present, in the hydrometallurgical process of laterite nickel ore, the pulp after high-pressure leaching needs to be pre-neutralized to ensure that the subsequent countercurrent washing can effectively separate the solid and liquid. Due to different batches of laterite nickel ore, adjustments to the front-end processing procedures, differences in actual reactions, etc., the pulp after pre-neutralization in different time periods is not exactly the same, which will cause the pre-neutralized pulp to enter the first-stage countercurrent washing. The flocculation and sedimentation effect is often poor, which in turn affects the solid-liquid separation effect of the entire multi-stage countercurrent washing.

[0003] In the prior art, the pre-neutralized slurry and the washing water of the primary countercurrent washing are generally manually pumped out on site at regular intervals, mixed and flocculated in the laboratory, and finally the flow rate of the pre-neutralized slurry entering the countercurrent washing is manually adjusted according to the actual situation of the mixed flocculation. However, this method is time-consuming, has hysteresis, and is difficult to adjust in time. Summary of the invention

[0004] In view of this, it is necessary to provide a hydrometallurgical pre-neutralization and real-time control system and method to solve the technical problem in the prior art 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, wherein 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 for obtaining a flocculation and sedimentation effect signal in the detection tank and adjusting the discharge flow rate 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 respectively obtain a first flow signal and a second flow signal of the first flow meter and the second flow meter, and control the opening of the first valve and the second valve according to a preset ratio of slurry and washing water, the first flow signal and the second flow signal.

[0007] Furthermore, a spare tank is included, and a feed end and a discharge end of the spare tank are connected to the slurry discharge pipe through a first shunt pipe and a second shunt 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 a first threshold value, 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 value; judging whether the flocculation and sedimentation effect signal is less than a 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 rate 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 thickener 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 a set time of flocculation and sedimentation. The solid content detector is used to detect the solid content in the pre-neutralized 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 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, and comprises 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 a 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 the countercurrent washing thickener, and washing water is introduced into the detection tank by using the second detection tube to clean the detection tank.

[0014] In some embodiments, when it is necessary to reduce the input flow rate of the pre-neutralized slurry, the first diversion pipe is opened to allow part of the pre-neutralized slurry to flow into the standby tank; when it is necessary to increase the input flow rate of the pre-neutralized slurry, 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 prior art, the real-time control system for hydrometallurgical pre-neutralization provided by the present invention is provided 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, and 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 implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail as follows with reference to the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their 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 a 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 laterite nickel ore hydrometallurgical pre-neutralization.

[0020] In the figure:

[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 shunt pipe; 56. Second shunt pipe; 57. Discharge pipe;

[0026] 61. a first flow meter; 62. a second flow meter; 63. a 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 in conjunction with 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 also Figure 1 The present invention provides a real-time control system for pre-neutralization of hydrometallurgy. The real-time control system for pre-neutralization of hydrometallurgy is used in the countercurrent washing process in metallurgical production to match the input flow of pre-neutralized slurry with washing water and flocculant to achieve the best flocculation and sedimentation effect.

[0032] It should be noted that the hydrometallurgical pre-neutralization and real-time control system of the present invention is used for, but not limited to, laterite nickel ore hydrometallurgy, and can also be applied to other production activities that require countercurrent washing. In the present invention, only the application of the hydrometallurgical pre-neutralization and real-time control system to laterite nickel ore hydrometallurgy is used as an example for explanation, and the principles of application to other production are substantially the same as those of application to laterite nickel ore hydrometallurgy, and are not described one by one here.

[0033] The present hydrometallurgical pre-neutralization real-time control system comprises a pre-neutralization tank 1, a countercurrent washing and thickening machine 2, a detection tank 3 and a control device 4. The pre-neutralization tank 1 is used for the slurry to undergo a neutralization reaction inside it. When multi-stage pre-neutralization is adopted, the pre-neutralization tank 1 of this embodiment can be the tank body where the last stage of neutralization reaction occurs. The pre-neutralization tank 1 is connected to the countercurrent washing and thickening machine 2 through a slurry discharge pipe 51. When multi-stage countercurrent washing is adopted, the countercurrent washing and thickening machine 2 in this embodiment can be a first-stage thickening machine. The detection tank 3 is connected to the slurry discharge pipe 51 and the washing water inlet pipe 54 of the countercurrent washing and thickening machine 2 through a first detection pipe 52 and a second detection pipe 53 respectively. The detection tank 3 has a flocculant filler for filling a certain amount of flocculant into the detection tank 3. The flocculant filler can be a filling pipe with flow control or a container with scales, which is pre-filled with a certain amount of flocculant inside and then filled into 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 filling amount, thereby ensuring the flocculation and sedimentation effect in the washing thickener 2.

[0034] It is easy to understand that the pre-neutralization slurry, washing water and other liquids can be driven to flow by height difference, liquid pressure or external driving force provided by a pump. Correspondingly, the pre-neutralization tank 1, the countercurrent washing thickener 2, the detection tank 3 and other components are arranged at a suitable height, or a pump body drive is arranged on the corresponding pipeline.

[0035] The 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 sedimentation effect, and timely adjusts the input flow of the pre-neutralized slurry 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 caused by 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 arranged at the lower part of the detection tank 3, and is used to detect the height of the mud layer in the detection tank 3 after the flocculation and sedimentation set time. The solid content detector 42 is arranged at the upper part of the detection tank 3, and is used to detect the solid content in the pre-neutralized slurry. The mud layer detector 41 detects the mud layer height to generate a first signal, and the solid content detector 42 detects the solid content to generate a second signal, and the flocculation and sedimentation effect signal is determined by the ratio of the first signal to the second signal.

[0037] In some embodiments, a first flow meter 61 and a first valve 71 are provided on the first detection tube 52, and a second flow meter 62 and a second valve 72 are provided on the second detection tube 53. The first flow meter 61 and the second flow meter 62 are used to detect the flow of the pre-neutralized slurry and the washing 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 of the first flow meter 61 and the second flow meter 62, respectively, and control the opening of the first valve 71 and the second valve 72 according to the preset ratio of slurry and washing water, the first flow signal and the second flow signal, so as to control the flow of the pre-neutralized slurry and the washing water, so that the flow ratio of the pre-neutralized slurry and the washing water in the first detection tube 52 and the second detection tube 53 is the same as the flow ratio of the pre-neutralized slurry and the washing water in the slurry discharge pipe 51 and the washing water inlet pipe 54. To ensure that the ratio of the pre-neutralized slurry, washing water and flocculant extracted in the detection tank 3 is the same as that in the countercurrent washing thickener 2, so that the detection result fits the actual situation in the countercurrent washing 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 washing thickener 2 through a first shunt pipe 55 and a second shunt pipe 56, respectively. The pre-neutralized slurry input flow rate of the countercurrent washing thickener 2 is adjusted according to the flocculation and sedimentation results in the detection tank 3. When the pre-neutralized slurry input amount needs to be reduced, a portion of the slurry in the slurry discharge pipe 51 flows into the standby tank 8 through the first shunt pipe 55 and is temporarily stored. When the pre-neutralized slurry input amount needs to be increased, the pre-neutralized slurry in the standby tank 8 flows into the countercurrent washing thickener 2 through the second shunt pipe 56, thereby adjusting the pre-neutralized slurry input amount.

[0039] In a preferred embodiment, a third flow meter 63 and a third valve 73 are provided on the first shunt pipe 55, and a metering pump 9 is provided on the second shunt pipe 56. Similar to the functions of other flow meters and valves, the flow rate of the pre-neutralized slurry flowing through the first shunt pipe 55 is controlled by controlling the opening of the third valve 73, thereby quantitatively reducing the input amount of the pre-neutralized slurry. The metering pump 9 can pump the pre-neutralized slurry in the standby tank 8 into the countercurrent washing thickener 2 at a set flow rate, thereby quantitatively increasing the input amount of the pre-neutralized slurry. In other embodiments, a similar combination of flow meters and valves can also be used to replace the metering pump 9, and the height difference can be used as the flow power of the pre-neutralized slurry.

[0040] In a preferred embodiment, the detection tank 3 is also connected to the countercurrent washing and thickening machine 2 through a discharge pipe 57, and a fourth valve 74 is provided on the discharge pipe 57. After the detection of the detection tank 3 is completed, the fourth valve 74 is opened to transport the mixed liquid of the pre-neutralized slurry, washing water and flocculant back to the countercurrent washing and thickening machine 2 through the discharge pipe 57 to recover the pre-neutralized slurry for detection.

[0041] See also Figure 2 The present invention also provides a real-time control method for pre-neutralization of laterite nickel ore hydrometallurgical process, which adopts the above system and comprises the following steps: respectively inputting pre-neutralized slurry and washing water into the detection tank 3 through the first detection tube 52 and the second detection tube 53, injecting a certain amount of flocculant into the detection tank 3 through the flocculant injector, and utilizing the impact force of the pre-neutralized slurry and washing water when they enter the detection tank 3 to make them evenly mixed. After a certain amount of pre-neutralized slurry and washing water are 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 of the countercurrent washing and thickening machine 2 is increased; when the sedimentation effect is normal, the input flow rate of the pre-neutralized slurry is kept unchanged; when the sedimentation effect is poor, the input flow rate of the pre-neutralized slurry of the countercurrent washing and thickening machine 2 is reduced.

[0043] Specifically, in this embodiment, the mud layer detector 41 detects the height of the mud layer after flocculation and sedimentation to obtain a first signal A. The solid content detector 42 detects the solid content in the pre-neutralized slurry to obtain a second signal B. The flocculation and sedimentation effect signal C = A / B. It is easy to understand that when the flocculation and sedimentation are more complete, the height of the mud layer precipitated at the bottom is higher, that is, the larger A is. The less solid content in the upper liquid, that is, the smaller B is. Therefore, the larger the value of C, the more complete the 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 the 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 the 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, an adjustment value can be estimated, and then tested, and the next adjustment can be guided by the test results, and the C value can be adjusted to between D and E through multiple adjustments. Some experienced users can adjust the C value to between D and E in one step according to 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 in the detection tank 3 is the same as that in the countercurrent washing thickener 2, so that the detection result fits the actual situation in the countercurrent washing thickener 2.

[0047] In a preferred embodiment, when the pre-neutralized slurry and washing water are introduced through the first detection tube 52 and the second detection tube 53, the fourth valve 74 can be opened first when the first valve 71 and the second valve 72 are adjusted to the required flow rate. This avoids large experimental errors caused by the pre-neutralized slurry and washing water input according to the wrong proportion during adjustment. When the input flow rate is adjusted to the required value and stabilized, the fourth valve 74 is closed, and a certain amount of flocculant is added to conduct the experiment.

[0048] In some embodiments, after the control device 4 completes the detection, the fourth valve 74 is opened to transport the mixed liquid in the detection tank 3 to the countercurrent washing thickener 2 to recover the pre-neutralized slurry for testing. The second valve 72 is then opened to introduce washing water into the detection tank 3 through the second detection tube 53 to clean the detection tank 3 to prevent the residual substances from the previous experiment from affecting the results of the next experiment.

[0049] In some embodiments, when it is necessary to reduce the input flow rate of the pre-neutralized slurry, the first shunt pipe 55 is opened to allow part of the pre-neutralized slurry to flow into the standby tank 8. When it is necessary to increase the input flow rate of the pre-neutralized slurry, 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 filled with 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 a constant value, and the content of each component in the slurry is different at different times, in order to keep the flocculation and sedimentation of the pre-neutralized slurry in a good state, the second detection tube 53 is used to introduce washing water into the detection tank 3. After cleaning the detection tank 3, the detection tank 3 is used to perform a detection at regular intervals, and the discharge flow rate of the slurry discharge pipe 51 is adjusted according to the flocculation and sedimentation effect signal of the detection tank 3.

[0052] Compared with the prior art, the real-time control system for hydrometallurgical pre-neutralization provided by the present invention is provided 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, and 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 implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope 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 and a control device, 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, and the detection tank has 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.

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 and 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: It also includes a spare tank, wherein the feed end and the discharge end of the spare tank are connected to the slurry discharge pipe through a first shunt pipe and a second shunt pipe respectively.

4. The hydrometallurgical pre-neutralization real-time control system according to claim 3 is characterized in that: The first shunt pipe is provided with a third flow meter and a third valve, and the second shunt pipe is provided with a metering pump. Adjusting the discharge flow rate of the slurry discharge pipe according to the flocculation and sedimentation effect signal includes: obtaining the flocculation and sedimentation effect signal, judging whether the flocculation and sedimentation effect signal is greater than a first threshold value, 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 value; judging whether the flocculation and sedimentation effect signal is less than a second threshold value, and if so, determining diversion, and controlling 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 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.

5. 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.

6. 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 a set time of flocculation and sedimentation. 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.

7. 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 6, which includes the following steps: pre-neutralized slurry and washing water are respectively input into the detection tank through the first detection tube and the second detection tube, a certain amount of flocculant is added into the detection tank through the flocculant injector, and after a set time, the control device is used to detect the flocculation and sedimentation effect signal in the detection tank, and the discharge flow rate of the slurry discharge pipe is adjusted according to the flocculation and sedimentation effect signal.

8. The hydrometallurgical pre-neutralization real-time control method according to claim 7, 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.

9. The hydrometallurgical pre-neutralization real-time control method according to claim 7, 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 the washing water is introduced into the detection tank by the second detection pipe to clean the detection tank.

10. The hydrometallurgical pre-neutralization real-time control method according to claim 7, characterized in that: When it is necessary to reduce the input flow rate of the pre-neutralized slurry, the first diversion pipe is opened to allow part of the pre-neutralized slurry to flow into the standby tank; when it is necessary to increase the input flow rate of the pre-neutralized slurry, 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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