A precious metal extraction apparatus and control system therefor

Abstract

The application discloses a noble metal extraction device and a control system thereof, and relates to the field of noble metal extraction. The control system comprises a first acquisition module, a second acquisition module and a third acquisition module. The first acquisition module is used for acquiring the liquid level value of the extraction liquid. The second acquisition module is used for acquiring the weight value of the ore. The third acquisition module is used for acquiring the pH value of the extraction liquid. A data processing module is used for comparing the pH value with a preset pH value threshold to determine whether a detection instruction is generated. If the detection instruction is generated, i groups of weight values in t time periods are acquired. The difference between every two adjacent groups of weight values is calculated to obtain i-1 groups of weight value differences. The i-1 groups of weight value differences are established into an analysis set, the average value of the analysis set is calculated, the change of the noble metal in the ore is determined in real time based on the change of the weight of the ore and the change of the pH value, and the reaction time is controlled in real time, so that the extraction efficiency is improved while the extraction effect is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of precious metal extraction, in particular to a precious metal extraction device and a control system thereof. BACKGROUND

[0002] Precious metals (such as gold, silver, platinum, palladium, etc.) have wide applications in the fields of electronics, jewelry, industrial catalysis, etc. due to their rarity and characteristics such as high electrical conductivity and corrosion resistance. Currently, the extraction of precious metals commonly uses extraction method, which generally involves leaching, extraction, stripping and separation.

[0003] Through leaching, the precious metals in the ore can be dissolved in the form of ions into the aqueous phase of the extraction liquid. Then, through mixing with the organic phase solvent, the precious metals are converted from the aqueous phase to the organic phase. Finally, through stripping and separation, the precious metals are obtained. For example, a kind of precious metal extraction device is disclosed in the authorized announcement No. CN208485924U, which comprises an extraction tank, an isolation plate one, an isolation plate two, an extractant tank, a conduit system and a hydraulic system. The extraction tank is provided with two groups of horizontal through holes, i.e. air holes one and air holes two, which penetrate the tank body. Above and below the air holes one and air holes two, there are a circle of upper and lower convex strips around the inner wall of the extraction tank. The isolation plate one and the isolation plate two are inserted into the extraction tank from the air holes one and air holes two respectively, and the extraction tank is evenly divided into three reaction cavities. A filter screen is placed at the bottom of each reaction cavity.

[0004] Secondly, when extracting precious metals, it is necessary to first convert the precious metals from the ore into the aqueous phase. According to experience, the current production process reacts for a set time. However, the current production efficiency or resource waste of precious metals from ore cannot be balanced, and there are many deficiencies. SUMMARY

[0005] (I) Invention purpose

[0006] Therefore, the purpose of the present application is to provide a precious metal extraction device and a control system thereof, so as to realize real-time determination of the conversion of precious metals in ore based on the weight change and pH value change of the ore, real-time control of the reaction time, and improvement of the extraction efficiency while ensuring the extraction effect.

[0007] (II) Technical solutions

[0008] In order to achieve the above technical purposes, the present application provides a precious metal extraction device, which comprises:

[0009] An extraction tank is rotatably connected with a driving main shaft in the middle;

[0010] A driven shaft is sleeved on the driving main shaft, and the driving main shaft is used to drive the driven shaft to rotate;

[0011] The filter plate is slidably connected with the support seat in the middle, the driven shaft is rotationally connected with the support seat, and the filter plate is used for filtering solid matters;

[0012] The sleeve is fixed to the bottom of the support seat and is slidably and sealingly connected with the extraction tank, and the bottom of the sleeve is fixed with a sliding block;

[0013] The screw rod is sleeved on the bottom of the driven shaft, the outer surface of the screw rod is provided with a reciprocating screw groove, and the sliding block is slidably connected with the reciprocating screw groove;

[0014] The fixed seat is fixed to the bottom of the extraction tank, and the bottom of the screw rod is rotationally connected with the fixed seat.

[0015] Preferably, the outer surface of the driving main shaft is uniformly fixed with first tooth blocks, and the inner wall of the driven shaft is uniformly provided with first tooth grooves matched with the first tooth blocks.

[0016] Preferably, the bottom outer surface of the driven shaft is uniformly fixed with second tooth blocks, and the inner wall of the screw rod is uniformly provided with second tooth grooves matched with the second tooth blocks.

[0017] Preferably, the upper surface of the fixed seat is fixed with a guide rod, the fixed seat is fixedly connected with the bottom of the extraction tank through the guide rod, the bottom of the sleeve is fixed with a guide seat, and the guide seat is slidably connected with the guide rod.

[0018] Preferably, the top of the extraction tank is fixed with a feeding pipe, and the bottom of the extraction tank is fixed with a discharging pipe, and the feeding pipe and the discharging pipe are respectively used for feeding and discharging.

[0019] Preferably, the top of the extraction tank is fixed with a motor, and the output end of the motor is fixedly connected with the driving main shaft.

[0020] A precious metal extraction device control system applied to the precious metal extraction device, the control system comprises a first acquisition module, a second acquisition module, a third acquisition module and a data processing module, wherein each module is connected through wired and / or wireless network mode;

[0021] The first acquisition module is arranged in the extraction tank and is used for acquiring the liquid level value of the extraction liquid;

[0022] The second acquisition module is arranged on the filter plate and is used for acquiring the weight value of the ore;

[0023] The third acquisition module is arranged in the extraction tank and is used for acquiring the pH value of the extraction liquid;

[0024] The data processing module is used for comparing the pH value with a preset pH value threshold to determine whether a detection instruction is generated;

[0025] If the detection instruction is generated, the i groups of weight values in t time periods are acquired, t is a value greater than 1, and i is an integer greater than 1;

[0026] The difference between each two adjacent groups of weight values is calculated to obtain i-1 groups of weight value differences, an analysis set is established based on the i-1 groups of weight value differences, an average value of the analysis set is calculated, and the average value is compared with a preset average value threshold to determine whether to generate the leaching completion instruction.

[0027] Preferably, the weight value acquisition method comprises:

[0028] The real-time liquid level value is acquired, and the real-time liquid level value is compared with a preset liquid level value threshold;

[0029] If the liquid level value is less than or equal to the preset liquid level value, the second acquisition module acquires the weight value;

[0030] If the liquid level value is greater than the preset liquid level value, the second acquisition module does not work.

[0031] Preferably, the method for determining whether to generate the detection instruction comprises:

[0032] If the pH value is greater than or equal to a preset pH value threshold, the detection instruction is generated;

[0033] If the pH value is less than the preset pH value threshold, the detection instruction is not generated.

[0034] Preferably, the method for determining whether to generate the leaching completion instruction comprises:

[0035] If the average value is less than or equal to a preset average value threshold, the leaching completion instruction is generated;

[0036] If the average value is greater than the preset average value threshold, the leaching completion instruction is not generated.

[0037] From the above technical solutions, the present application has the following beneficial effects:

[0038] The present application finds that the reason why the production efficiency or resource waste of the current ore precious metal cannot be considered is that the set time obtained according to experience cannot make the precious metal in the ore completely converted into the water phase. Based on the discovery of this reason, the present application creatively determines whether the precious metal is completely converted by combining weight and pH change, and then performs extraction when the precious metal is completely converted. After the filter plate is raised, the ore is separated from the extraction liquid. At this time, the weight of the filter plate is obtained, that is, the weight of the ore is determined. When the filter plate is lowered, the extraction liquid flows through the filter plate, which plays a backwashing role on the filter plate, avoiding the blockage of the filter plate, so that the device of the present application has a self-cleaning effect, which is conducive to continuous production. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained based on the provided drawings without any creative effort.

[0040] Figure 1 A schematic diagram of the overall structure of a noble metal extraction device provided by the present application is shown in the figure.

[0041] Figure 2 A schematic diagram of the cross-sectional structure of a noble metal extraction device provided by the present application is shown in the figure.

[0042] Figure 3 A schematic diagram of the partial cross-sectional structure of a noble metal extraction device provided by the present application is shown in the figure.

[0043] Figure 4 A schematic diagram of the overall structure of a driving main shaft of a noble metal extraction device provided by the present application is shown in the figure.

[0044] Figure 5 A schematic diagram of the cross-sectional structure of a driven shaft of a noble metal extraction device provided by the present application is shown in the figure.

[0045] Figure 6 A schematic diagram of the cross-sectional structure of a screw rod and a support seat of a noble metal extraction device provided by the present application is shown in the figure.

[0046] Figure 7 A schematic diagram of the cross-sectional structure of a filter plate and a support seat of a noble metal extraction device provided by the present application is shown in the figure.

[0047] Figure 8 A flow chart of a control system of a noble metal extraction device provided by the present application is shown in the figure.

[0048] BRIEF DESCRIPTION OF DRAWINGS: 1, extraction tank; 11, feed pipe; 12, discharge pipe; 2, driving main shaft; 21, first tooth block; 3, driven shaft; 301, second tooth block; 302, first tooth groove; 31, screw rod; 311, reciprocating screw groove; 312, second tooth groove; 4, filter plate; 41, support seat; 411, sleeve; 4111, sliding block; 412, guide seat; 5, fixed seat; 51, guide rod; 6, motor. DETAILED DESCRIPTION

[0049] The following description is merely exemplary in nature and is not intended to limit the present disclosure, application and uses. It should be understood that throughout the drawings, the same or like reference numerals are used to depict the same or similar components and features. The various drawings are schematic illustrations only and are not necessarily drawn to scale. Certain portions of the drawings can be shown exaggerated in size, or drawn without respect to certain dimensions, for purposes of explanation and illustration.

[0050] Embodiment One

[0051] Referring to Figure 1 and Figure 2 , a precious metal extraction device includes an extraction tank 1, which is used for mixing reaction of ores and extraction liquid and can provide the required temperature for reaction. The extraction tank 1 is heated by an electric resistance heater or steam, which is not specifically limited here. The top of the extraction tank 1 is fixed with a feeding pipe 11, and the bottom of the extraction tank 1 is fixed with a discharging pipe 12, which are respectively used for feeding and discharging. For example, during extraction, the ores are ground into particles and added into the extraction tank 1 through the feeding pipe 11, and the extraction liquid is added according to the weight of the ore particles. The ores are converted into water phase, i.e., the precious metal and the remaining base metal are dissolved into the extraction liquid, through heating reaction in the extraction tank 1.

[0052] It should be noted that the feeding pipe 11 and the discharging pipe 12 are respectively provided with valves (not shown) for controlling the opening and closing of the feeding pipe 11 and the discharging pipe 12.

[0053] Further, referring to Figure 1 , Figure 2 , Figure 4 and Figure 5 , the top of the extraction tank 1 is fixed with a motor 6, the output end of the motor 6 is connected with a driving spindle 2, the driving spindle 2 is rotationally connected with the extraction tank 1, the bottom of the driving spindle 2 is sleeved with a driven spindle 3, and the outer surface of the driving spindle 2 is uniformly fixed with first tooth blocks 21. The inner wall of the driven spindle 3 is uniformly provided with first tooth grooves 302 which are matched with the first tooth blocks 21, so that the driving spindle 2 can drive the driven spindle 3 through cooperation of the first tooth blocks 21 and the first tooth grooves 302, and the driven spindle 3 can slide on the driving spindle 2 without being affected. The outer surface of the driven spindle 3 is uniformly fixed with stirring blades, the motor 6 drives the driven spindle 3 to rotate through the driving spindle 2, and the driven spindle 3 can drive the stirring blades to stir and accelerate the mixing of the extraction liquid and the ore particles.

[0054] Specifically, referring to Figure 2 and Figure 3As shown, the filter plate 4 is slidingly connected to the extraction tank 1, and the middle of the filter plate 4 is slidingly connected to the support seat 41, that is, the filter plate 4 can slide up and down along the axis of the support seat 41, the driven shaft 3 is rotationally connected to the support seat 41, and the driven shaft 3 can drive the support seat 41 to move up and down when the driven shaft 3 moves up and down, and the support seat 41 is prevented from rotating with the driven shaft 3, and the filter plate 4 is used for filtering solid objects, that is, separating ore particles from the extraction liquid;

[0055] More specifically, referring to Figure 2 、 Figure 5 、 Figure 6 and Figure 7 As shown, the bottom of the support seat 41 is fixed with a sleeve 411, and the sleeve 411 is slidingly connected to the bottom of the extraction tank 1, the bottom of the sleeve 411 is fixed with a sliding block 4111, the bottom of the driven shaft 3 is sleeved with a screw rod 31, and the outer surface of the bottom of the driven shaft 3 is uniformly fixed with a second tooth block 301, and the inner wall of the screw rod 31 is uniformly provided with a second tooth groove 312 matching the second tooth block 301, so that the driven shaft 3 can drive the screw rod 31 to rotate through the cooperation of the second tooth block 301 and the second tooth groove 312, and meanwhile the driven shaft 3 can ascend and descend in the screw rod 31;

[0056] The outer surface of the screw rod 31 is provided with a reciprocating screw groove 311, and the sliding block 4111 is slidingly connected to the reciprocating screw groove 311, so that when the screw rod 31 rotates with the driven shaft 3, the reciprocating screw groove 311 can push the sliding block 4111 to make the sleeve 411 move up and down with the sliding block 4111, so as to drive the filter plate 4 to move up and down, when the filter plate 4 moves up, the extraction liquid is separated below the filter plate 4, and only ore particles are reserved above the filter plate 4, when the filter plate 4 moves down, the extraction liquid is immersed above the filter plate 4, so as to backwash the filter plate 4, which can avoid the filter holes on the surface of the filter plate 4 from being blocked, and when the filter plate 4 moves up and down, the extraction liquid is stirred, which is combined with the stirring of the stirring blades to further accelerate the precious metal or base metal in the ore particles to be dissolved in the extraction liquid.

[0057] More specifically, referring to Figure 1 and Figure 2 As shown, the bottom of the extraction tank 1 is fixed with a fixed seat 5, the upper surface of the fixed seat 5 is fixed with a guide rod 51, the top of the guide rod 51 is fixed to the bottom of the extraction tank 1, the bottom of the screw rod 31 is rotationally connected to the fixed seat 5 to ensure the stability of the rotation of the screw rod 31, the bottom of the sleeve 411 is fixed with a guide seat 412, and the guide seat 412 is slidingly connected to the guide rod 51 to prevent the sleeve 411 from rotating with the screw rod 31, so that when the screw rod 31 rotates, the sleeve 411 can reciprocate up and down.

[0058] It is worth mentioning that, referring to Figure 1As shown, the side of the extraction tank 1 is fixed with a solid discharge pipe, the fixed discharge pipe is controlled to open and close through a flap valve, after the end of the extraction reaction, through the rising process of the filter plate 4, the stirring blade rotates, which can push the ore particles out of the fixed discharge pipe.

[0059] Embodiment two

[0060] Referring to Figure 2 and Figure 8 As shown, a precious metal extraction device control system is realized based on the above-mentioned embodiment one precious metal extraction device, the control system comprises: a first acquisition module, a second acquisition module, a third acquisition module and a data processing module, wherein each module is connected through wired and / or wireless network mode.

[0061] The first acquisition module is used for acquiring the liquid level value of the extraction liquid, in the embodiment, the first acquisition module adopts a liquid level detectable sensor such as an ultrasonic sensor or a water immersion sensor, which is not limited here, and in the embodiment, the first acquisition module can be installed on the top of the extraction tank 1, taking the ultrasonic sensor as an example, the ultrasonic sensor determines the liquid level value by emitting ultrasonic waves and measuring the return time of the ultrasonic waves, specifically, the sensor emits ultrasonic waves and receives the reflected signals, and the distance between the liquid and the sensor can be calculated according to the time delay of the signals, so as to determine the liquid level value.

[0062] The second acquisition module is used for acquiring the weight value of the ore, in the embodiment, the second acquisition module adopts a pressure sensor or a weighing sensor to obtain the weight value of the ore, which is not limited here, and specifically, the second acquisition module is installed on the support seat 41 in embodiment one, and the detection end abuts against the bottom of the filter plate 4, since the filter plate 4 can slide on the support seat 41, the overall weight of the filter plate 4 can be transmitted to the second acquisition module, when the filter plate 4 rises away from the extraction liquid, only the ore particles exist on the filter plate 4, and then the weight value obtained by the second acquisition module minus the weight of the filter plate 4 itself is the weight value of the ore, in the embodiment, the second data acquisition module is defaulted to subtract the weight of the filter plate 4 itself according to the set program;

[0063] It should be noted that the power supply line and the communication cable of the second acquisition module can be embedded in the sleeve 411, and the weight value acquisition method comprises: acquiring a real-time liquid level value, comparing the real-time liquid level value with a preset liquid level value threshold; if the liquid level value is less than or equal to the preset liquid level value, the second acquisition module acquires the weight value; if the liquid level value is greater than the preset liquid level value, the second acquisition module does not work, the preset liquid level value is the liquid level value collected by the technical personnel in the art after the filter plate 4 rises away from the extraction liquid, which is used as the preset liquid level value; the purpose is to avoid the second acquisition module working all the time and only acquiring the weight value when the filter plate 4 is away from the extraction liquid, because if the filter plate 4 is in the extraction liquid, the acquired weight value has no reference value;

[0064] The third acquisition module is configured to acquire the pH value of the extraction liquid. In this embodiment, the third acquisition module is a pH value sensor. In an example, the pH value sensor is fixed in the extraction tank 1. The pH value sensor is based on the change of the potential difference of the glass electrode. When the acidity or alkalinity of the solution changes, the potential difference between the glass electrode and the reference electrode also changes. The potential difference can be measured by the circuit between the electrodes, and the pH value of the solution can be calculated according to the measurement result.

[0065] The data processing module is configured to compare the pH value with a preset pH value threshold, and determine whether to generate a detection instruction.

[0066] If the detection instruction is generated, i sets of weight values in t time periods are acquired, t is a number greater than 1, and i is an integer greater than 1, that is, a detection time is set, and the detection is performed in the detection time. The unit of t is minute.

[0067] The difference between each two adjacent sets of weight values is calculated to obtain i-1 sets of weight value differences. The i-1 sets of weight value differences are established as an analysis set, the average value of the analysis set is calculated, and the average value is compared with a preset average value threshold to determine whether to generate a leaching completion instruction. That is, after the noble metal or base metal in the ore is converted into the aqueous phase, the weight will decrease. If the ore is fully reacted, the weight will not change. Therefore, when the pH value meets the set condition in this embodiment, the change of the weight of the ore is tested. If the i-1 sets of weight value differences are smaller, it indicates that the ore tends to be fully reacted, and the work can be stopped.

[0068] The purpose of this embodiment is to automatically determine the reaction condition of the ore in real time, to adaptively control the reaction time, to avoid that the reaction time is too short, which leads to insufficient extraction, and to avoid that the reaction time is too long, which increases the energy consumption and reduces the extraction efficiency.

[0069] Specifically, the method for determining whether to generate the detection instruction comprises: generating the detection instruction if the pH value is greater than or equal to a preset pH value threshold; and not generating the detection instruction if the pH value is less than the preset pH value threshold. The preset pH value threshold is determined by the person skilled in the art according to the specific ore precious metal composition and the extraction liquid used. In the ore extraction process, the pH value of the extraction liquid specifically depends on the type of ore being processed. Chemical reactions involved in the leaching process can cause acid or base to be released into the leaching solution, thereby affecting the pH value. If the leaching reaction produces acidic substances, the pH value will decrease. Conversely, if the leaching reaction produces basic substances, the pH value will increase. That is, the person skilled in the art sets the preset pH value threshold by taking the pH value of the extraction liquid after the precious metal in the reacted ore is fully converted into the aqueous phase as a reference ratio in an experimental environment. In this embodiment, the precious metal produces basic substances or consumes acidic substances in the extraction liquid, such as gold metal. Therefore, after the ore is fully reacted, the acidic components in the extraction liquid decrease, and the pH value increases. At this time, it can be preliminarily determined that the ore reaction is approaching completion, and the detection instruction is generated, and the result can be further confirmed.

[0070] More specifically, the method for determining whether to generate the leaching completion instruction comprises: generating the leaching completion instruction if the average value is less than or equal to a preset average value threshold; and not generating the leaching completion instruction if the average value is greater than the preset average value threshold. The preset average value threshold is obtained by the person skilled in the art based on a large number of experiments. After the precious metal or base metal in the ore is converted into the aqueous phase, the weight will decrease. If the ore is fully reacted, its weight will not change substantially. Therefore, the person skilled in the art collects the weight values of multiple groups of ore under the condition that the ore continues to react after being fully reacted, and obtains the difference value changes. The median is selected as the preset average value threshold. The smaller the preset average value threshold, the smaller the difference value change.

[0071] The exemplary embodiments of the scheme proposed by the present disclosure are described in detail above with reference to the preferred embodiments. However, those skilled in the art can understand that various modifications and improvements can be made to the above specific embodiments without departing from the concept of the present disclosure, and various technical features and structures proposed by the present disclosure can be combined without exceeding the protection scope of the present disclosure, and the protection scope of the present disclosure is determined by the appended claims.

Claims

1. A precious metal extraction apparatus, characterised in that, The utility model relates to an improved extraction tank, which comprises an extraction tank (1) with a driving main shaft (2) rotatably connected in the middle, a driven shaft (3) sleeved on the driving main shaft (2) and used to drive the driven shaft (3) to rotate, a filter plate (4) with a support seat (41) slidably connected in the middle, the driven shaft (3) and the support seat (41) being rotatably connected, and the filter plate (4) being used to filter solid objects, a sleeve (411) fixed to the bottom of the support seat (41) and slidably and sealingly connected with the extraction tank (1), the bottom of the sleeve (411) being fixed with a sliding block (4111), a screw rod (31) sleeved on the bottom of the driven shaft (3), the outer surface of the screw rod (31) being provided with a reciprocating screw groove (311), and the sliding block (4111) being slidably connected with the reciprocating screw groove (311), when the screw rod (31) rotates with the driven shaft (3), the reciprocating screw groove (311) can push the sliding block (4111) to make the sleeve (411) move up and down with the sliding block (4111), so that the filter plate (4) moves up and down, when the filter plate (4) moves up, the extraction liquid is separated below the filter plate (4), and only ore particles are reserved above the filter plate (4), when the filter plate (4) moves down, the extraction liquid is immersed above the filter plate (4), the filter plate (4) can be backwashed, the filter holes on the surface of the filter plate (4) can be prevented from being blocked, and when the filter plate (4) moves up and down, the extraction liquid rolls, the stirring of the stirring blades is matched, and the precious metal or base metal in the ore particles is further accelerated to be dissolved in the extraction liquid. A fixing seat (5) is fixed to the bottom of the extraction tank (1), and the bottom of the screw rod (31) is rotatably connected with the fixing seat (5). The outer surface of the driving main shaft (2) is uniformly provided with a first tooth block (21), and the inner wall of the driven shaft (3) is uniformly provided with a first tooth groove (302) matched with the first tooth block (21). The bottom outer surface of the driven shaft (3) is uniformly provided with a second tooth block (301), and the inner wall of the screw rod (31) is uniformly provided with a second tooth groove (312) matched with the second tooth block (301). The upper surface of the fixing seat (5) is fixed with a guide rod (51), the fixing seat (5) is fixedly connected with the bottom of the extraction tank (1) through the guide rod (51), the bottom of the sleeve (411) is fixed with a guide seat (412), and the guide seat (412) is slidably connected with the guide rod (51). The top of the extraction tank (1) is fixed with a feeding pipe (11), the bottom of the extraction tank (1) is fixed with a discharging pipe (12), and the feeding pipe (11) and the discharging pipe (12) are respectively used for feeding and discharging. The top of the extraction tank (1) is fixed with a motor (6), and the output end of the motor (6) is fixedly connected with the driving main shaft (2). The control system comprises a first acquisition module, a second acquisition module, a third acquisition module and a data processing module, wherein the modules are connected through wired and / or wireless network modes.

2. A precious metal extraction apparatus as claimed in claim 1, wherein The first acquisition module is arranged in the extraction tank (1) and is used for acquiring the liquid level value of the extraction liquid.

3. A precious metal extraction apparatus as claimed in claim 1, wherein ​ 4. A precious metal extraction apparatus as claimed in claim 1, wherein ​ 5. A precious metal extraction apparatus as claimed in claim 1, wherein ​ 6. A precious metal extraction apparatus as claimed in claim 1, wherein ​ 7. A noble metal extraction device control system applied to the noble metal extraction device according to any one of claims 1-6, characterized in that, ​ ​ A second acquisition module is arranged on the filter plate (4) and used for acquiring the weight value of the ore; A third acquisition module is arranged in the extraction tank (1) and used for acquiring the pH value of the extraction liquid; The data processing module is used for comparing the pH value with a preset pH value threshold to determine whether a detection instruction is generated; If the detection instruction is generated, i groups of weight values in t time periods are acquired, t is a value greater than 1, and i is an integer greater than 1; The difference between every two adjacent groups of weight values is calculated to obtain i-1 groups of weight value differences, an analysis set is established based on the i-1 groups of weight value differences, the average value of the analysis set is calculated, and the average value is compared with a preset average value threshold to determine whether an extraction completion instruction is generated.

8. A precious metal extraction plant control system according to claim 7, characterised in that, The acquisition method of the weight value comprises: An real-time liquid level value is acquired, and the real-time liquid level value is compared with a preset liquid level value threshold; If the liquid level value is less than or equal to the preset liquid level value, the second acquisition module acquires the weight value; If the liquid level value is greater than the preset liquid level value, the second acquisition module does not work.

9. A precious metal extraction apparatus control system according to claim 7, wherein, The method for determining whether the detection instruction is generated comprises: If the pH value is greater than or equal to the preset pH value threshold, the detection instruction is generated; If the pH value is less than the preset pH value threshold, the detection instruction is not generated.

10. A precious metal extraction apparatus control system according to claim 7, wherein, The method for determining whether the extraction completion instruction is generated comprises: If the average value is less than or equal to the preset average value threshold, the extraction completion instruction is generated; If the average value is greater than the preset average value threshold, the extraction completion instruction is not generated.

Images