Method and device for continuously measuring concentration of carbon particles in ore pulp in gold cyanidation leaching process

Abstract

The invention relates to a device and method for continuously measuring the concentration of carbon particles in ore pulp in the gold cyanidation leaching process, the device comprises an ore pulp barrel, a flushing system, a carbon measuring pipe, a screen and a control system, one end of the ore pulp barrel is provided with an ore pulp inlet, the other end of the ore pulp barrel is connected with a first branch of the flushing system, and the outlet end of the ore pulp barrel is connected with the carbon measuring pipe; the carbon measuring pipe is provided with a screen, one side of the screen is connected with a visual sensor installation branch used for installing a visual sensor, the other side of the screen is provided with an ore pulp discharging branch, the visual sensor is used for detecting the stacking height of carbon particles in the carbon measuring pipe, and a liquid level sensor is arranged in the ore pulp barrel. The liquid level sensor is used for detecting the total liquid level height of ore pulp, and the control system is used for controlling the action condition of the flushing system and calculating the volume of carbon particles according to liquid level height data obtained by the liquid level sensor and carbon particle height data obtained by the visual sensor.

Description

Technical Field

[0001] This invention relates to the field of carbon particle concentration detection technology in slurry, and more particularly to a method and apparatus for continuously measuring carbon particle concentration in slurry during gold cyanide leaching. Background Technology

[0002] In cyanide leaching processes, accurate measurement of activated carbon particle concentration (bottom carbon density) is a core parameter for controlling gold extraction efficiency. The whole-sludge cyanide carbon-in-pulp process requires hourly measurement of the activated carbon density in the slurry (15-25 g / L) to optimize adsorption and ensure recovery rates.

[0003] In existing technologies, methods for measuring carbon density have several limitations. For example, document CN202321957343.8 discloses a device that uses an electric telescopic rod and an electric guide rail to replace manual carbon sampling. This device uses an electric device to transmit the sample to an electronic weighing device to measure the carbon concentration. However, the detection method is the traditional method of measuring carbon particle concentration by weight, which is easily affected by the density of the carbon particles, including the adsorption effect of the carbon particles and the number of times the carbon particles have been used, leading to large measurement errors. Furthermore, this method cannot achieve continuous monitoring. Document 201920130992.2 discloses an automatic carbon density detection device using a continuous carbon leaching system. Its limitation is that after the slurry and carbon particles are separated and washed, the carbon particles are weighed directly. However, moisture still adheres to the surface or interior of the carbon particles after washing, leading to an overestimation of the weight and thus a large measurement error. Application No. 202010749405.0 discloses an intelligent carbon density meter, but its limitation lies in the need for water control after rinsing the carbon particles, resulting in an excessively long overall testing process. Furthermore, the sampling spoon lacks a corresponding detection device, leading to significant errors due to reliance on overflow. Application No. 202021326381.X discloses an online automatic carbon density detection device for a carbon leaching system, but requires manual intervention to replace the mounting plate after each weighing, making continuous carbon measurement impossible. Application No. CN201710933204.4 discloses a device for automatically measuring carbon particle concentration using a DCS automatic control system. This device lacks a screen for separating the slurry and carbon particles, resulting in insufficient separation, and relies solely on a single laser level gauge, leading to relatively large errors.

[0004] Most existing carbon density measuring devices calculate carbon particle concentration by measuring the weight of carbon particles, similar to manual detection (such as the kettle sampling method). This has significant drawbacks: large errors, discontinuity, and data lag. Furthermore, existing technologies struggle to meet the demands of modern mining for continuous automation and precision. Therefore, a novel device integrating sensor technology and automated control is urgently needed to achieve real-time, high-precision measurement of carbon density, thus overcoming the technical bottleneck in carbon particle detection. Summary of the Invention In response to the aforementioned technical problems, a method and apparatus for continuously measuring the carbon particle concentration in slurry during gold cyanide leaching are provided.

[0005] The technical means employed in this invention are as follows: A device for continuously measuring the carbon particle concentration in slurry during gold cyanide leaching includes a slurry tank, a flushing system, a carbon measuring tube, a screen, and a control system. One end of the slurry tank has a slurry inlet, and the other end is connected to a first branch of the flushing system. The outlet end of the slurry tank is connected to the carbon measuring tube, which is fitted with a screen. A vision sensor mounting branch is connected to one side of the screen, and a slurry discharge branch is located on the other side of the screen. The vision sensor detects the accumulation height of carbon particles in the carbon measuring tube. A liquid level sensor is installed inside the slurry tank to detect the total liquid level of the slurry. The control system controls the operation of the flushing system and calculates the carbon particle volume based on the liquid level data obtained from the liquid level sensor and the carbon particle height data obtained from the vision sensor.

[0006] Furthermore, the flushing system also includes a second branch, which is connected to the visual sensor mounting branch. A first flushing valve and a second flushing valve are respectively provided on the first branch and the second branch. The end of the flushing system is a flushing water inlet.

[0007] Furthermore, a first valve is installed on the pipeline connected to the slurry inlet, and a second valve is installed on the carbon measuring pipe connected to the slurry outlet.

[0008] Furthermore, the upper side of the screen is a branch for installing a vision sensor, and a carbon discharge valve for discharging carbon particles is provided on the carbon measuring tube connected to the upper side of the screen.

[0009] Furthermore, the visual sensor installation branch is a three-way pipe, and another output branch is connected to the slurry discharge branch, with a third valve installed on the output branch.

[0010] Furthermore, the aperture of the screen is at most 2 mm.

[0011] The present invention also discloses a method for using the above-mentioned device, comprising the following steps: Step 1: Control the feeding of the slurry tank. The liquid level sensor obtains the liquid level height in the slurry tank and stops feeding when the preset value is reached. Step 2: Water enters the rinsing system, closes the first rinsing valve, and opens the second rinsing valve and the carbon discharge valve to rinse the screen; after a period of time, close the second rinsing valve and the carbon discharge valve. Step 3: Open the second and third valves to control the discharge of slurry from the slurry tank. The vision sensor measures the volume of carbon particles and transmits the data to the industrial control computer. Step 4: Calculate the carbon particle volume based on the liquid level height data from the liquid level sensor and the carbon particle height data from the vision sensor.

[0012] Furthermore, before step 1, the following steps are also included: opening the first valve, the second valve, and the carbon discharge valve; after the slurry enters the slurry tank from the slurry inlet and flows stably for a period of time, the second valve is closed and feeding begins.

[0013] Furthermore, in step 4, the carbon particle concentration is calculated based on the carbon particle volume. Whether the carbon particle concentration is within the normal range is displayed on the touch screen. Based on the calculated carbon particle concentration information, if the carbon particle concentration is too low, the downstream carbon replenishment light will light up and a signal will be sent to the downstream carbon stringing device to replenish carbon in time. If the carbon particle concentration is too high, the upstream carbon discharge light will light up and a signal will be sent to the upstream carbon stringing device to discharge carbon in time, so as to ensure that the carbon concentration in the leaching tank is always kept within the process standard.

[0014] Compared with the prior art, the present invention has the following advantages: 1. This invention calculates the concentration of carbon particles in the slurry by detecting the volume of carbon particles, which can avoid the difference in density between new and old carbon affecting the detection results of carbon particle concentration, and the detection speed is faster.

[0015] 2. The continuous detection of carbon density is fully automated, with accurate and reliable measurement. Furthermore, through the coordinated control of PLC and industrial control computer, no manual intervention is required, which improves work efficiency while protecting human resources.

[0016] 3. The algorithm of machine vision can reduce the error of human intervention. The detection of carbon particles can be achieved at the minute level, which ensures the real-time and accuracy of process control.

[0017] 4. This invention can achieve closed-loop linkage control of real-time online monitoring data of carbon particle concentration and adsorption process parameters through protocol integration with the DCS system of mineral processing plants, providing technical support for the automated and intelligent control of carbon particles in gold carbon slurry cyanide leaching. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a front view of the device of the present invention.

[0020] Figure 2 This is a structural partition diagram of the device of the present invention.

[0021] Figure 3 This is a front view of the internal piping area of ​​the device of the present invention.

[0022] Figure 4 This is an axonometric view of the internal piping area of ​​the device of the present invention.

[0023] Figure 5 This is a detailed view of the pipe screen of the device of the present invention.

[0024] Figure 6 This is a perspective view of the internal structure of the device of the present invention.

[0025] Figure 7 This is a schematic diagram of the slurry tank structure of the present invention.

[0026] In the diagram: 1. Liquid level sensor, 2. First flushing valve, 3. Second flushing valve, 4. Flushing system, 5. Flushing water inlet, 6. Vision sensor, 7. Slurry outlet, 8. Third valve, 9. Carbon discharge valve, 10. Screen, 11. Carbon measuring tube, 12. Second valve, 13. Slurry tank, 14. Slurry inlet, 15. First valve, 16. Button, 17. Touch screen, 18. Device casing, 19. Device piping area, 20. Device control area. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0031] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0032] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0033] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0034] like Figures 1-6 As shown, this embodiment of the invention discloses a device for continuously measuring the carbon particle concentration in slurry during gold cyanide leaching. It includes a device piping area 19 and a device control area 20 integrated within a device housing 18. A button 16 and a touchscreen 17 are provided on the outside of the device housing. Specifically, the device includes a slurry tank 13, a rinsing system 4, a carbon measuring tube 11, a screen 10, and a control system. One end of the slurry tank 13 is provided with a slurry inlet 14, and the other end is connected to a first branch of the rinsing system. The outlet end of the slurry tank is connected to the carbon measuring tube. The slurry tank is used to store slurry for detecting slurry volume. The carbon measuring tube is equipped with a screen, and a vision sensor mounting branch is connected to one side of the screen for mounting a vision sensor. A slurry discharge branch is provided on the other side of the screen, and the end of the slurry discharge branch is the slurry discharge outlet 7. The vision sensor 6 is used to detect the accumulation height of carbon particles in the carbon measuring tube. A liquid level sensor 1 is provided inside the slurry tank. The liquid level sensor is used to detect the total liquid level height of the slurry. The control system is used to control the operation of the flushing system and to calculate the carbon particle volume based on the liquid level height data obtained by the liquid level sensor and the carbon particle height data obtained by the vision sensor.

[0035] The carbon particles are trapped by the screen 10. Through the rinsing process, the slurry is discharged, and the carbon is uniformly and densely packed. The visual sensor 6 is used to detect the stacking height of the carbon particles in the transparent pipe. The volume difference model is used to calculate the volume of the carbon particles, thereby accurately measuring the carbon particle concentration and completing the carbon density determination. After the measurement is completed, the carbon discharge valve 9 and the rinsing water are opened to discharge the carbon and enter the next cycle of measurement.

[0036] The carbon particle concentration measurement of this invention is fully automated, which not only ensures accurate and reliable measurement, but also solves the problems of long measurement time, large error and high labor intensity of manual measurement. At the same time, the carbon data measured by this device is connected to the industrial carbon lifting motor, which can realize the continuous control of carbon stringing in the gold cyanide process.

[0037] The buttons and touchscreen are used for human-machine interaction and parameter setting. The device control area integrates a PLC and an industrial computer to control the operation of the entire device. The PLC is connected to the flushing system, liquid level sensor, vision sensor, and various valves. In this embodiment, the vision sensor uses an industrial camera to detect the volume and height of the carbon particles. The industrial computer fuses the liquid level compensation data and the visual detection data in real time to calculate the current carbon volume concentration value, with a control cycle of ≤200ms.

[0038] In this embodiment, the slurry tank is as follows: Figure 7 As shown, the structure consists of an upper cylinder and a lower frustum. Where V2 is the volume of the frustum in the diagram. Simplifying, we get V = 3.14 * h * (4 + 2.5h + 0.5208h) 2 When h = 8cm, V 1440cm 3 V1 is the volume of the upper cylindrical part of the carbon storage barrel. ,

[0039] h1 is the height detected by the visual sensor, h is the height detected by the level gauge, and C is the final carbon particle concentration (g / L, cm⁻¹). 3 \L), according to The upper part of the result The unit is g. In the formula, k represents the amount of carbon particles stored on the left side of the sieve, and k represents the amount of carbon particles stored above the sieve. The standard experiment based on different pipe diameters is calibrated in advance.

[0040] All the above formulas are calculated directly on the PLC. .

[0041] In this embodiment, a Siemens PLC can be selected.

[0042] The visual sensor is configured to acquire dynamic images of carbon particle accumulation at a frame rate of not less than 25 fps. The intelligent control structure is integrated into the PLC controller, industrial computer and human-machine interface terminal in the device control area, and is realized through the Profinet industrial bus protocol: 1) Receive real-time monitoring data from liquid level sensor 1 and process it with PID algorithm; 2) Analyze the carbon particle image data collected by the vision camera; 3) Synchronously control the coordinated action of the corresponding valve and the flushing valve. Furthermore, the rinsing system also includes a second branch connected to the vision sensor mounting branch. A first rinsing valve 2 and a second rinsing valve 3 are respectively installed on the first and second branches. The end of the rinsing system is a rinsing water inlet 5. The rinsing system is used to rinse the screen and pipes.

[0043] Furthermore, a first valve 15 is installed on the pipeline connected to the slurry inlet, and a second valve 12 is installed on the carbon measuring pipe connected to the slurry outlet.

[0044] Furthermore, the upper side of the screen is a branch for installing a vision sensor, and a carbon discharge valve 9 for discharging carbon particles is provided on the carbon measuring tube connected to the upper side of the screen.

[0045] Furthermore, the visual sensor installation branch is a three-way pipe, and another output branch is connected to the slurry discharge branch, with a third valve 8 installed on the output branch.

[0046] The first and second flushing valves mentioned above are solenoid valves. The first, second, and third valves, as well as the carbon discharge valve, can be pneumatic ball valves.

[0047] The carbon measuring tube mentioned in this embodiment is a section of tube. Because it is equipped with a screen and a visual sensor mounting branch, it can achieve the accumulation of carbon particles and complete the volume detection of the carbon particles. The carbon measuring tube is a transparent tube to facilitate detection by a visual camera.

[0048] Furthermore, the screen is used to filter carbon particles in the slurry. Experiments have shown that the average size of the carbon particles is 3.29 mm, the smallest carbon particle size is 2.5 mm, and the screen aperture is at most 2 mm.

[0049] The touch screen in the control area of ​​the device can display the operating status parameters of each component, liquid level data, images captured by the vision sensor, and other information. Operators can manually or automatically control the opening and closing of each valve and flushing operations through the touch screen and buttons, and can set relevant parameters. The present invention also discloses a method for using the above-mentioned device, comprising the following steps: Press the start button, and the device enters the preparation stage.

[0050] Initial steps: Open the first valve, the second valve, and the carbon discharge valve. After the slurry enters the slurry tank from the slurry inlet and flows stably for a period of time, in this embodiment, after flowing for 10 seconds, close the second valve and start feeding.

[0051] Specifically, the flow rate of the pump that extracts the slurry is not stable when it is first started. The purpose of the initial step is to stabilize the process of the pump extracting the slurry. During this process, the slurry flows into the pipelines below, including the carbon measuring tube, the visual sensor installation branch, the slurry discharge branch, etc. The cleaning of the pipelines before inspection is completed through the following step 2. Step 1: Open the first valve 15 and close the other valves to control the feeding of the slurry tank. The liquid level sensor obtains the liquid level height in the slurry tank and stops feeding when the preset value is reached. Step 2: Water enters the rinsing system, closes the first rinsing valve, and opens the second rinsing valve and the carbon discharge valve to rinse the screen; after a period of time, close the second rinsing valve and the carbon discharge valve. Step 3: Open the second and third valves for 20 seconds to control the slurry tank to drain. After the drainage is complete, open the first flushing valve 1 to flush for 10 seconds. The visual sensor measures the carbon particle volume and transmits it to the industrial control computer. After flushing is completed, reset all valves to return to the preparation stage.

[0052] The slurry flows away from the third valve, while the carbon remains in the carbon measuring pipeline.

[0053] The first and second flushing valves can be opened or closed under the control of the device control area. Flushing water introduced through the flushing water inlet flushes the carbon particles in the carbon measuring tube, allowing them to accumulate more compactly. It also flushes components such as the slurry tank, carbon measuring tube, and screen to remove residual slurry and impurities. After flushing, a photo is taken. After taking the photo, the second valve, carbon discharge valve, first flushing valve, and second flushing valve are opened, and the third valve is closed. The entire flushing process is completed in 20 seconds, after which all valves are reset, awaiting the next measurement.

[0054] Step 4: Calculate the carbon particle volume based on the liquid level height data from the liquid level sensor and the carbon particle height data from the vision sensor.

[0055] In step 4, the carbon particle concentration is calculated based on the carbon particle volume. The carbon particle concentration is displayed on the touch screen to see if it is within the normal range. Based on the calculated carbon particle concentration information, if the carbon particle concentration is too low, the downstream carbon replenishment light will illuminate and a signal will be sent to the downstream carbon stringing device to replenish carbon in time. If the carbon particle concentration is too high, the upstream carbon discharge light will illuminate and a signal will be sent to the upstream carbon stringing device to discharge carbon in time, so as to ensure that the carbon concentration in the leaching tank is always kept within the process standard.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for continuously measuring the carbon particle concentration in slurry during gold cyanide leaching, characterized in that, The system includes a slurry tank, a flushing system, a carbon measuring tube, a screen, and a control system. One end of the slurry tank has a slurry inlet, and the other end is connected to a first branch of the flushing system. The outlet end of the slurry tank is connected to the carbon measuring tube, which is fitted with a screen. A vision sensor mounting branch is connected to one side of the screen, and a slurry discharge branch is located on the other side of the screen. The vision sensor detects the accumulation height of carbon particles in the carbon measuring tube. A liquid level sensor is installed inside the slurry tank to detect the total liquid level of the slurry. The control system controls the operation of the flushing system and calculates the carbon particle volume based on the liquid level data obtained from the liquid level sensor and the carbon particle height data obtained from the vision sensor.

2. The apparatus according to claim 1, characterized in that, The flushing system also includes a second branch, which is connected to the visual sensor mounting branch. A first flushing valve and a second flushing valve are respectively installed on the first branch and the second branch. The end of the flushing system is a flushing water inlet.

3. The apparatus according to claim 1, characterized in that, A first valve is installed on the pipeline connected to the slurry inlet, and a second valve is installed on the carbon measuring pipe connected to the slurry outlet.

4. The apparatus according to claim 1, characterized in that, The upper side of the screen is a branch for installing a vision sensor, and a carbon discharge valve for discharging carbon particles is installed on the carbon measuring tube connected to the upper side of the screen.

5. The apparatus according to claim 1, characterized in that, The visual sensor is installed in a three-way pipe, and another output branch is connected to the slurry discharge branch. A third valve is installed on this output branch.

6. The apparatus according to claim 1, characterized in that, The aperture of the screen is at most 2 mm.

7. A method of using the device according to any one of claims 1 to 6, characterized in that, Includes the following steps: Step 1: Control the feeding of the slurry tank. The liquid level sensor obtains the liquid level height in the slurry tank and stops feeding when the preset value is reached. Step 2: Water enters the rinsing system, closes the first rinsing valve, and opens the second rinsing valve and the carbon discharge valve to rinse the screen; after a period of time, close the second rinsing valve and the carbon discharge valve. Step 3: Open the second and third valves to control the discharge of slurry from the slurry tank. The vision sensor measures the volume of carbon particles and transmits the data to the industrial control computer. Step 4: Calculate the carbon particle volume based on the liquid level height data from the liquid level sensor and the carbon particle height data from the vision sensor.

8. The method according to claim 7, characterized in that, Before step 1, the following steps are also included: opening the first valve, the second valve, and the carbon discharge valve. After the slurry enters the slurry tank from the slurry inlet and flows stably for a period of time, the second valve is closed and feeding begins.

9. The method according to claim 7, characterized in that, In step 4, the carbon particle concentration is calculated based on the carbon particle volume. The carbon particle concentration is displayed on the touch screen to see if it is within the normal range. Based on the calculated carbon particle concentration information, if the carbon particle concentration is too low, the downstream carbon replenishment light will illuminate and a signal will be sent to the downstream carbon stringing device to replenish carbon in time. If the carbon particle concentration is too high, the upstream carbon discharge light will illuminate and a signal will be sent to the upstream carbon stringing device to discharge carbon in time, so as to ensure that the carbon concentration in the leaching tank is always kept within the process standard.

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