A kind of hydrometallurgical pre-neutralization and real-time control system and method for lateritic nickel ore

Abstract

The application relates to a laterite nickel ore hydrometallurgical pre-neutralization and real-time control system and method, the system includes: a pre-neutralization tank, a counter-current washing thickener, a detection tank, and a control device, the pre-neutralization tank is connected to the countercurrent washing thickener through the slurry discharge pipe, the detection tank is connected to the slurry discharge pipe and the washing inlet pipe of the counter-current washing thickener through the first detection pipe and the second detection pipe respectively, and the detection tank has a flocculant injector. The control device is used to obtain the flocculation and sedimentation effect signal in the detection tank and adjust the discharge flow rate of the slurry discharge pipe according to the flocculation and sedimentation effect signal. Compared with the prior technique, the system is provided with a detection tank between the pre-neutralization tank and the counter-current washing thickener, the pre-neutralized slurry and the washing water are input into the detection tank, and the flocculation and sedimentation effect is detected by using the control device, 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 when the countercurrent washing is carried out.

Description

[0001] Description

[0002] A KIND OF HYDROMETALLURGICAL PRE -NEUTRALIZATION AND REAL-TIME CONTROL SYSTEM AND METHOD FOR LATERITIC NICKEL ORE

[0003] FIELD OF THE DISCLOSURE

[0004] The application relates to the field of laterite nickel ore hydrometallurgical technology, in particular to a laterite nickel ore hydrometallurgical pre-neutralization and real-time control system and method.

[0005] BACKGROUND

[0006] At present, in the hydrometallurgical process of laterite nickel ore, it is necessary to pre-neutralize the slurry after high-pressure leaching to ensure that the subsequent countercurrent washing can effectively separate the solid-liquid. Due to the different batches of laterite nickel ore, the adjustment of the front-end treatment process, the difference of the actual reaction, etc., the pre-neutralized slurry in different periods is not the same, which will lead to the poor flocculation and sedimentation effect of the pre-neutralized slurry when it enters the first-stage countercurrent washing, which in turn affects the solid-liquid separation effect of the entire multi-stage countercurrent washing.

[0007] In the prior technique, the washing water of the pre- neutralized slurry and the first-stage countercurrent washing is generally pumped out manually on site at regular intervals, and mixed flocculation is carried out 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 mixed flocculation. However, this method takes a long time and has a lag, which makes it difficult to adjust in time . SUMMARY

[0008] Because of this , it is necessary to provide a hydrometallurgical pre-neutrali zation and real-time control system and method for laterite nickel ore to solve the technical problems of long detection time and untimely adj ustment in the existing technique .

[0009] The application provides a lateritic nickel ore hydrometallurgical pre-neutrali zation and real-time control system, the laterite nickel ore hydrometal lurgical pre-neutrali zation and real-time control system including a pre-neutrali zation tank, a counter-current washing thickener, a detection tank, and a control device , the pre-neutrali zation tank is connected to the counter- current washing thickener through the slurry discharge pipe , the detection tank is connected to the slurry discharge pipe and the washing inlet pipe of the counter-current washing thickener through the first detection pipe and the second detection pipe respectively, and the detection tank has a flocculant inj ector, then a control device is used to obtain the flocculation and sedimentation ef fect signal in the detection tank and adj ust the discharge flow rate of the slurry discharge pipe according to the flocculation and sedimentation ef fect signal .

[0010] Further, the first detection tube is provided with a first flow meter and a first valve , the second detection pipe is provided with a second flow meter and a second valve , and the control device is used for obtaining the first flow signal and the second flow signal of the first flow meter and the second flow meter respectively, and controls 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 .

[0011] Further, it included a standby tank, and the feeding end and the discharging end of the standby tank are connected with the slurry discharge pipe through the first mani fold pipe and the second mani fold pipe respectively .

[0012] Further, the first mani fold pipe is provided with a third flowmeter and a third valve , a metering pump is arranged on the second mani fold pipe , and the discharging flow rate of the slurry discharge pipe is adj usted according to the flocculation settlement ef fect signal , compri sing : obtaining a flocculation settlement ef fect signal , j udging whether the flocculation settlement ef fect signal is greater than the first threshold value , then j udging the confluence , and controlling the metering pump to input the slurry of the corresponding flow rate into the slurry discharge pipe according to the di f ference between the flocculation settlement ef fect signal and the first threshold value ; j udging whether the flocculation sedimentation ef fect signal is less than the second threshold, i f so , the diversion is determined, and the third valve opening degree is controlled according to the flow rate corresponding to the di f ference between the second threshold and the flocculation sedimentation ef fect signal and the flow signal detected by the third flowmeter ; I f the flocculation sedimentation ef fect signal is between the second threshold and the first threshold, the third valve is controlled to close and the metering pump is stopped .

[0013] Further, the detection tank is also connected to the counter- current washing thickener through the discharge pipe , and a fourth valve is arranged on the discharge pipe .

[0014] Further, the control device included a mud layer detector and a solid content detector, the mud layer detector is used for detecting the height of the mud layer after the flocculation and sedimentation setting time in the detection tank, the solid content detector is used for detecting the solid content in the pre- neutrali zed slurry, and the flocculation and sedimentation ef fect signal in the detection tank included : the f irst signal of obtaining the height of the mud layer and the second signal of the solid content and determining the flocculation and sedimentation ef fect signal based on the ratio of the first signal and the second signal .

[0015] The application provides a laterite nickel ore hydrometallurgical pre-neutrali zation and real-time control method, the laterite nickel ore hydrometal lurgical pre-neutrali zation and real-time control method adopts laterite nickel ore hydrometallurgical pre-neutrali zation and real-time control system, including the following steps : through the first detection tube and the second detection tube respectively input pre- neutrali zation slurry and washing water into the detection tank, through the flocculant inj ector to the detection tank to fill a certain amount of flocculant , after a set time using the control device to detect the flocculation settlement ef fect signal in the detection tank, According to the flocculation and sedimentation ef fect signal , the discharge flow rate of the slurry discharge pipe is adj usted .

[0016] In some embodiments , the ratio of the flow rate of pre- neutrali zed slurry in the first detection pipe to the flow rate of washing water in the second detection pipe is the same as the ratio of the flow rate of pre-neutrali zed slurry in the slurry discharge pipe to the flow rate of washing water in the washing inlet pipe .

[0017] In some embodiments , after the control device completes the detection, the mixed liquid in the detection tank is transported to the counter- flow washing thickener, and the second detection pipe is used to introduce washing water into the detection tank to clean the detection tank .

[0018] In some embodiments , when the input flow rate of pre- neutrali zed slurry needs to be reduced, the first shunt pipe is opened so that part of the pre-neutrali zed slurry flows into the standby tank; When it is necessary to increase the input flow rate of the pre-neutrali zed slurry, open the second mani fold pipe to make the pre-neutrali zed slurry in the backup tank flow into the counter-current washing thickener .

[0019] Compared with the prior technique , the laterite nickel ore hydrometallurgical pre-neutrali zation and real-time control system provided in the application is provided with a detection tank between the pre-neutrali zation tank and the counter-current washing thickener, the pre-neutrali zed slurry and the washing water are input into the detection tank, and the flocculation and sedimentation ef fect is detected by using the control device , and the input flow rate of the pre-neutrali zed slurry is adj usted in time according to the sedimentation ef fect , so that the pre- neutrali zed slurry maintains a good sedimentation ef fect during countercurrent washing, and the negative impact caused by the instability of the pre-neutrali zed slurry is eliminated .

[0020] The above description is only an overview of the technical solution of the present application, to be able to understand the technical means of the present application more clearly and can be implemented by the contents of the description, the preferred embodiment of the present application, and the accompanying drawings are described in detail as follows . The speci fic embodiment of the present application is given in detail by the following embodiment and its accompanying drawings .

[0021] BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings illustrated herein are used to provide a further understanding of the application and form part of the application, and the schematic embodiments of the application and its description are used to interpret the application and do not constitute an undue limitation of the application . In the accompanying drawing :

[0023] FIG . 1 is a schematic diagram of the structure of a preferred embodiment of the hydrometallurgical pre-neutrali zation and real- time control system of laterite nickel ore provided in the present application .

[0024] FIG . 2 is the flow chart of the hydrometallurgical pre- neutrali zation and real-time regulation method of laterite nickel ore provided in this application .

[0025] DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0026] The preferred embodiment of the present application is described below in conj unction with the accompanying drawings , wherein the drawings form a part of the present application and are used together with the embodiments of the present application to illustrate the principle of the present application and are not used to limit the scope of the present application .

[0027] See FIG . 1 , this application provides a hydrometallurgical pre- neutrali zation and real-time control system for laterite nickel ore . The laterite nickel ore hydrometallurgical pre-neutrali zation and real-time control system is used in the countercurrent washing process in metallurgical production so that the input flow of pre- neutrali zed slurry matches the washing water and flocculant to achieve the best flocculation and sedimentation ef fect . It should be noted that the pre-neutrali zation and real-time control system of laterite nickel ore hydrometallurgy in the present application is used in but not limited to laterite nickel ore hydrometallurgy and can also be applied to other production activities that require countercurrent washing . In the present application, only the application of the pre-neutrali zation and real-time control system of laterite nickel ore hydrometallurgy to the hydrometallurgy of laterite nickel ore is taken as an example , and the principle applied to other production is essentially the same as that applied to the hydrometallurgy of laterite nickel ore , which will not be repeated here .

[0028] The laterite nickel ore hydrometallurgical pre-neutrali zation and real-time control system included a pre-neutrali zation tank 1 , a counter-current washing thickener 2 , a detection tank 3 , and a control device 4 . The pre-neutrali zation tank 1 is used for the neutrali zation reaction of the slurry to occur inside it , and when multi-stage pre-neutrali zation is adopted, the pre-neutrali zation tank 1 of the present embodiment can be the tank where the last stage of neutrali zation reaction occurs . The pre-neutrali zation tank 1 is connected to the countercurrent washing thickener 2 through the slurry discharge pipe 51 , and when multi-stage countercurrent washing is adopted, the countercurrent washing thickener 2 in this embodiment can be a first-stage thickener . Detection tank 3 is connected with the slurry discharge pipe 51 and the washing inlet pipe 54 of the countercurrent washing thickener 2 through the first detection pipe 52 and the second detection pipe 53 respectively . Detection tank 3 is provided with a flocculant inj ector and is used for filling a certain amount of flocculant into the detection tank 3 . The flocculant inj ector can be a filling tube with flow control or a graduated container, which is prefilled with a certain amount of flocculant inside and then filled into the detection tank 3 . The Control device 4 is used for obtaining the flocculation and settling ef fect signal in the detection tank 3 and adj usting the discharge flow rate of the slurry discharge pipe 51 according to the flocculation and settling ef fect signal , that is , the present embodiment is input to the detection tank 3 by the slurry, washing water, and flocculant according to the actual reaction ratio to fully mix and flocculation precipitation occurs , the result of the control device 4 detects the flocculation and sedimentation ef fect and forms the flocculation and settling ef fect signal , and the discharge flow rate of the slurry discharge pipe 51 is adj usted according to the flocculation and settling ef fect signal simultaneously slurry discharge flow rate is matched with the washing water flow rate and the flocculant filling amount , and the flocculation and sedimentation ef fect in the washing thickener 2 is ensured .

[0029] It is easy to understand that the flow of liquids such as pre- neutrali zed slurry and wash water can be driven by the height di f ference , the pressure of the liquid itsel f , or by the pump providing an external driving force . Correspondingly, the pre- neutrali zation tank 1 , the counter- flow washing thickener 2 , the detection tank 3 , and other components are arranged at a suitable height , or the pump body drive is arranged on the corresponding pipeline .

[0030] The system introduces pre-neutrali zed slurry and washing water into the detection tank 3 respectively through the first detection tube 52 and the second detection tube 53 , uses the control device 4 to detect the flocculation and sedimentation ef fect and adj usts the input flow rate of the pre-neutrali zed slurry in time according to the sedimentation ef fect so that the pre-neutrali zed slurry maintains a good sedimentation ef fect when the countercurrent washing in the countercurrent washing thickener 2 , and eliminates the negative impact of the instability of the pre-neutrali zed slurry .

[0031] In some embodiments , control device 4 included 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 for detecting the mud layer height after the flocculation and sedimentation setting time in the detection tank 3 . The solid content detector 42 is arranged on the upper part of the detection tank 3 and is used for detecting the solid content in the pre- neutrali zed slurry . The mud layer detector 41 detects the height of the mud layer and produces the first signal , and the solid content detector 42 detects the solid content and produces the second signal , and the flocculation settlement ef fect signal is determined by the ratio of the first signal and the second signal . In some embodiments , a first flowmeter 61 and a first valve 71 are arranged on the first detection tube 52 , and a second flowmeter 62 and a second valve 72 are arranged on the second detection tube 53 . The first flowmeter 61 and the second flowmeter 62 are used for detecting the flow rate of pre-neutrali zed slurry and washing water in the first detection tube 52 and the second detection tube 53 respectively . 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 according to the preset slurry and washing water ratio , the first flow signal and the second flow signal , control the opening of the first valve 71 and the second valve 72 and can control the flow rate of pre- neutrali zing slurry and washing water, make the flow ratio of pre- neutrali zed slurry and washing water in the first detection pipe 52 and the second detection pipe 53 and the flow ratio of pre- neutrali zed slurry and washing water in the slurry discharge pipe 51 and washing water inlet pipe 54 the same . To ensure that the proportion of pre-neutrali zed 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 results are in line with the actual situation in the countercurrent washing thickener 2 .

[0032] In some embodiments , the system further includes a backup tank 8 , wherein the backup tank 8 is respectively connected with a slurry discharge pipe 51 and a counterflow washing thickener 2 through a first mani fold pipe 55 and a second mani fold pipe 56 . According to the flocculation and sedimentation result in the detection tank 3 , adj ust the pre-neutrali zation slurry input flow rate of countercurrent washing thickener 2 , when it is necessary to reduce the pre-neutrali zation slurry input amount , a part of the slurry in the slurry discharge pipe 51 flows into the standby tank 8 through the first mani fold pipe 55 , and is temporarily stored . When it is necessary to increase the input amount of pre- neutrali zed slurry, the pre-neutrali zed slurry in the standby tank 8 flows into the countercurrent washing thickener 2 through the second mani fold pipe 56 , so that the adj ustment of the input amount of pre-neutrali zed slurry is reali zed . In the preferred embodiment , a third flowmeter 63 and a third valve 73 are arranged on the first mani fold pipe 55, and a metering pump 9 is arranged on the second mani fold pipe 56 . Similar to the function of other flow meters and valves , by controlling the opening of the third valve 73 , the flow rate of pre-neutrali zed slurry flowing through the first mani fold pipe 55 is controlled, so that the input amount of pre-neutrali zed slurry is quantitatively reduced . The metering pump 9 can pump the pre- neutrali zed slurry in the standby tank 8 into the counter- flow washing thickener 2 according to the set flow rate , thereby quantitatively increasing the input amount of pre-neutrali zed slurry . In other embodiments , a combination of a similar flow meter and a valve may be adopted instead of the metering pump 9 , while utili zing the height di f ference as the flow power of the pre- neutrali zed slurry .

[0033] In the preferred embodiment , detection tank 3 is also connected to the countercurrent washing thickener 2 through discharge pipe 57 , and a fourth valve 74 is arranged on discharge pipe 57 . After the detection tank 3 is tested, the fourth valve 74 is opened, and the mixed liquid of pre-neutrali zed slurry, washing water, and flocculant is transported back to the counterflow washing thickener 2 through the discharge pipe 57 so that the pre- neutrali zed slurry used for detection is recovered .

[0034] Referring to FIG . 2 , the application also provides a hydrometallurgical pre-neutrali zation and real-time regulation method for laterite nickel ore , which adopts the above-mentioned system and includes the following steps : the pre-neutrali zation slurry and washing water are respectively input into the detection tank 3 through the first detection tube 52 and the second detection tube 53 , a certain amount of flocculant is added to the detection tank 3 through the flocculant inj ector, and the impact force of the pre-neutrali zed slurry and the washing water when entering the detection tank 3 is used to mix it evenly . When a certain amount of pre-neutrali zed slurry and wash water is introduced, the first detection tube 52 and the second detection tube 53 are closed .

[0035] After passing the preset time , use control device 4 to detect the flocculation and sedimentation situation in the detection tank 3 . When the sedimentation ef fect is good, the input flow rate of the pre-neutrali zation slurry of the countercurrent washing thickener 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-neutralization slurry of the countercurrent washing thickener 2 is reduced.

[0036] Specifically, in the present embodiment, the mud layer detector 41 detects the height of the mud layer after flocculation and precipitation and obtains the first signal A. The solid content detector 42 detects the solid content in the pre-neutralized slurry and obtains a second signal B. Flocculation sedimentation effect signal C=A / B. It is easy to understand that when the flocculation settlement is more sufficient, the higher the height of the sedimented mud layer at the bottom, that is, the greater the A. The lower the solids content in the upper liquid, i.e. the smaller the B. Therefore, the greater the value of C, the more adequate the flocculation settlement.

[0037] At the same time, the first threshold D, and the second threshold E are preset, and when E<CdD, the sedimentation effect is normal, and the input flow rate of the pre-neutralized slurry is kept unchanged. When C>D, it means that the sedimentation effect is good, the confluence is judged, and the input flow rate of the pre-neutralized slurry needs to be increased to reduce C to between D and E. Control metering pump 9 inputs the slurry of corresponding flow rate in slurry discharge pipe 51 according to the difference between the flocculation sedimentation effect signal and the first threshold D. When C is less than E, it means that the sedimentation effect is poor, and it is necessary to reduce the input flow rate of the pre-neutralized slurry to increase the C drop to between D and E. According to the flow rate corresponding to the difference between the second threshold E and the flocculation sedimentation effect signal and the flow signal detected by the third flowmeter 63, the third valve 73 is controlled to an open degree, so that the slurry of rated flow rate is diverted to the standby tank 8.

[0038] When adjusting the input flow rate of the pre-neutralized slurry, an adjustment value can be estimated, and then the test can be carried out, and then the next adjustment can be guided according to the test results, and the C value can be adjusted between D and E through multiple adj ustments . Some experienced users can adj ust the C value to D and E in one step according to the si ze of the di f ference between the C value and the D value or E value .

[0039] In some embodiments , the ratio of the flow rate of pre- neutrali zed slurry in the first detection pipe 52 to the flow rate of washing water in the second detection pipe 53 is the same as the ratio of the flow rate of pre-neutrali zed slurry in the slurry discharge pipe 51 and the flow rate of washing water in the washing inlet pipe 54 . To ensure that the proportion of pre-neutrali zed 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 results are in line with the actual situation in the countercurrent washing thickener 2 .

[0040] In the preferred embodiment , when the pre-neutrali zed slurry and washing water are introduced through the first detection tank 52 and the second detection pipe 53 , the fourth valve 74 may be opened first when adj usting the first valve 71 and the second valve 72 to the required flow rate . Avoid large experimental errors caused by the pre-neutrali zation slurry and wash water input in the wrong proportion during adj ustment . When the input flow rate is adj usted to the required value and stabili zed, the fourth valve 74 is closed again, and a certain amount of flocculant is added to the experiment .

[0041] In some embodiments , after the control device 4 is tested, the fourth valve 74 is opened, and the mixed liquid in the detection tank 3 is transported to the countercurrent washing thickener 2 , and the pre-neutrali zed slurry for the test is recovered . The second valve 72 is opened again, and the second detection tube 53 is used to introduce washing water into detection tank 3 , and detection tank 3 is cleaned, to avoid the residual substance of the previous experiment af fecting the result of the next experiment

[0042] In some embodiments , when the input flow rate of pre- neutrali zed slurry needs to be reduced, the first mani fold pipe 55 is opened so that part of the pre-neutrali zed slurry flows into standby tank 8 . When the input flow rate of pre-neutrali zed slurry needs to be increased, open the second mani fold pipe 56 , or start the metering pump 9 to make the pre-neutrali zed slurry in the standby tank 8 flow into the slurry discharge pipe 51 , so that the adj ustment of the input amount of pre-neutrali zed slurry is reali zed .

[0043] Compared with the prior technique , the laterite nickel ore hydrometallurgical pre-neutrali zation and real-time control system provided in the application is provided with a detection tank between the pre-neutrali zation tank and the counter-current washing thickener, the pre-neutrali zed slurry and the washing water are input into the detection tank, and the flocculation and sedimentation ef fect is detected by using the control device , and the input flow rate of the pre-neutrali zed slurry is adj usted in time according to the sedimentation ef fect , so that the pre- neutrali zed slurry maintains a good sedimentation ef fect during countercurrent washing, and the negative impact caused by the instability of the pre-neutrali zed slurry is eliminated .

[0044] The foregoing is only a better embodiment of the present application, but the scope of protection of the present application is not limited to this , and any change or replacement that can be easily thought of by a person skilled in the technique within the scope of the technology disclosed in this application shall be covered by the scope of protection of this application .

Claims

WHAT IS CLAIMED IS1 . A laterite nickel ore hydrometallurgical pre-neutrali zation and real-time control system, wherein it includes : a pre- neutrali zation tank, a counter-current washing thickener, a detection tank, and a control device , the pre-neutrali zation tank is connected to the counter-current washing thickener through the slurry discharge pipe , the detection tank is respectively connected with the slurry discharge pipe and the washing inlet pipe of the counter-current washing thickener through the first detection pipe and the second detection pipe , and the detection tank has a flocculant inj ector, the control device is used for obtaining the flocculation and settling ef fect signal in the detection tank and adj usting the discharge flow rate of the slurry discharge pipe according to the flocculation settling ef fect signal .2 . Laterite nickel ore hydrometallurgical pre-neutrali zation and real-time control system according to claim 1 , is characteri zed in that , the first detection tube is provided with a first flow meter and a first valve , the second detection pipe is provided with a second flow meter and a second valve , the control device is used for obtaining the first flow signal and the second flow signal of the first flow meter and the second flow meter respectively, and controls 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 .3 . Laterite nickel ore hydrometallurgical pre-neutrali zation and real-time control system according to claim 1 , further comprising a standby tank, and the feed end and the discharge end of the standby tank are connected with the slurry discharge pipe through the first mani fold pipe and the second mani fold pipe respectively .4 . Laterite nickel ore hydrometallurgical pre-neutrali zation and real-time control system according to claim 3 , wherein the first mani fold pipe is provided with a third flowmeter and a third valve , and the second mani fold pipe is provided with a metering pumpadj usting the discharge flow rate of the slurry discharge pipe according to the flocculation and settling ef fect signal included : obtaining the flocculation settling ef fect signal , j udging whether the flocculation settling ef fect signal is greater than the first threshold, then j udging the confluence , and controlling the metering pump to input the slurry of corresponding flow rate into the slurry discharge pipe according to the di f ference between the flocculation settling ef fect signal and the first threshold value ; j udging whether the flocculation sedimentation ef fect signal is less than the second threshold, i f so , the diversion is determined, and the third valve opening degree is controlled according to the flow rate corresponding to the di f ference between the second threshold and the flocculation sedimentation ef fect signal and the flow signal detected by the third flowmeter ; I f the flocculation sedimentation ef fect signal is between the second threshold and the first threshold, the third valve is controlled to close and the metering pump is stopped .5 . Laterite nickel ore hydrometallurgical pre-neutrali zation and real-time control system according to claim 1 , wherein the detection tank is also connected to the countercurrent washing thickener through the discharge pipe , and a fourth valve is arranged on the discharge pipe .6 . Laterite nickel ore hydrometallurgical pre-neutrali zation and real-time control system according to claim 4 , is characteri zed in that , the described control device includes a mud layer detector and solid content detector, described mud layer detector is used for detecting mud layer height after flocculation and sedimentation setting time in described detection tank, described solid content detector is used for detecting solid content in pre- neutrali zed slurry, described used for obtaining flocculation and settlement ef fect signal in described detection tank included : first signal for obtaining described mud layer height and a second signal of described solid content And based on the ratio of the first signal to the second signal , the flocculation settlement ef fect signal is determined .7 . The laterite nickel ore hydrometallurgical pre-neutrali zation and real-time regulation method, wherein it adopts the laterite nickel ore hydrometallurgical pre-neutrali zation and real-time regulation and control system as described in any one of claims 1-7. and includes the following steps : the first detection tube and the second detection tube respectively input pre-neutrali zing slurry and washing water into the detection tank, and a certain amount of flocculant is inj ected into the detection tank through the flocculant inj ector, After a set time , the flocculation and sedimentation ef fect signal in the detection tank is detected by using the control device , and the discharge flow rate of the slurry discharge pipe is adj usted according to the flocculation and sedimentation ef fect signal .8 . The laterite nickel ore hydrometallurgical pre-neutrali zation and real-time regulation method according to claim 7 , wherein the ratio of the flow rate of the pre-neutrali zed slurry in the first detection pipe to the flow rate of the washing water in the second detection pipe is the same as the ratio of the flow rate of the pre-neutrali zed slurry in the slurry discharge pipe and the flow rate of the washing water in the washing inlet pipe .9 . The laterite nickel ore hydrometallurgical pre-neutrali zation and real-time regulation method according to claim 7 , wherein after the control device is detected, the mixed liquid in the detection tank is transported to the countercurrent washing thickener, and the second detection pipe is used to introduce washing water into the detection tank to clean the detection tank .10 . The laterite nickel ore hydrometallurgical pre-neutrali zation and real-time regulation method according to claim 7 , wherein when the input flow rate of pre-neutrali zed slurry needs to be reduced, the first shunt pipe is opened so that the part of the pre- neutrali zed slurry flows into the standby tank; when it is necessary to increase the input flow rate of pre-neutrali zed slurry, open the second mani fold pipe so that the pre-neutrali zed slurry in the standby tank flows into the counter-current washing thickener .

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