Environment-friendly integrated ash content detection system and tailing separation system

Abstract

The invention provides an environment-friendly integrated ash content detection system and a tailing separation system, relates to the technical field of mineral processing, and aims to solve the technical problems that tailing ash content detection is not environment-friendly and poor in adaptability. The environment-friendly integrated ash content detection system comprises a laser light source, a light intensity detection device, a concentration detection device, a detection black box and a container for accommodating tailing slurry, at least parts of the laser light source, the light intensity detection device and the container are located in the detection black box; the concentration detection device is used for detecting the concentration of tailing slurry; at least part of the part, located in the detection black box, of the container is made of a transparent material; light of the laser light source irradiates the tailing slurry through the container; and the light intensity detection device is used for detecting the light intensity of scattered light of the tailing mine slurry. The integrated ash content detection system is environment-friendly and safe, the detected ash content of the tailing mine slurry is less influenced by factors such as environment and materials, and the precision is high.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing, and in particular to an environmentally friendly integrated ash detection system and tailing coal sorting system. Background Art

[0002] As one of the main energy sources in the world, coal faces environmental and safety challenges while meeting energy needs. Coal slime flotation is an important process in coal separation. The tailing coal ash content is an important flotation index, which reflects the yield and recovery rate of flotation products to a certain extent and can guide the adjustment of on-site flotation process parameters.

[0003] In the related technologies, the ash content detection methods of flotation tailings all have their own shortcomings, for example, they are not environmentally friendly, are greatly affected by environmental or material factors, and have poor applicability. Summary of the invention

[0004] The purpose of the present invention is to provide an environmentally friendly integrated ash detection system and tail coal sorting system to solve the technical problems of environmental pollution and poor applicability of tail coal ash detection.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides an environmentally friendly integrated ash detection system, comprising a laser light source, a light intensity detection device, a concentration detection device, a detection black box, and a container for accommodating tailings slurry;

[0007] The laser light source, the light intensity detection device and at least part of the container are located inside the detection black box;

[0008] The concentration detection device is used to detect the concentration of the tailings slurry;

[0009] At least a portion of the container located inside the detection black box is formed of a transparent material;

[0010] The light from the laser light source passes through the container to irradiate the tailings slurry;

[0011] The light intensity detection device is used to detect the intensity of scattered light of the tailing coal slurry.

[0012] According to at least one embodiment of the present invention, the ash content detection system further includes a control device, and the laser light source, the light intensity detection device, and the concentration detection device are respectively connected to the control device for communication.

[0013] According to at least one embodiment of the present invention, the container is a pipe, the pipe runs through the detection black box, and the portion of the pipe located inside the detection black box is formed of a transparent material.

[0014] According to at least one embodiment of the present invention, the cross-section of the pipe has a circular or polygonal shape.

[0015] According to at least one embodiment of the present invention, the ash detection system further comprises a pushing device, which is fluidically connected to the pipeline and is used to pass the tailings slurry through the detection black box.

[0016] According to at least one embodiment of the present invention, the concentration detection device is arranged on a portion of the pipeline between the pushing device and the detection black box; or,

[0017] The concentration detection device is arranged on the portion of the pipeline located inside the detection black box.

[0018] According to at least one embodiment of the present invention, the concentration detection device includes one of an ultrasonic concentration meter, a spectrophotometer and an online refractometer.

[0019] In a second aspect, the present invention further provides a tailing coal sorting system, comprising a flotation device and the ash detection system described in the first aspect.

[0020] According to at least one embodiment of the present invention, the flotation device is communicatively connected to the control device, and the control device is used to adjust the process parameters of the flotation device according to the ash value of the tailings slurry in the pipeline.

[0021] According to at least one embodiment of the present invention, both ends of the pipeline are fluidly connected to the tailings outlet of the flotation device, so that the tailings slurry is circulated to the tailings outlet of the flotation device after ash content detection.

[0022] Among the one or more technical solutions provided in the exemplary embodiments of the present invention, at least one of the following beneficial effects can be achieved.

[0023] The ash detection system of the exemplary embodiment of the present invention includes a laser light source, a light intensity detection device, a concentration detection device, a detection black box, and a container for accommodating tailings slurry. In the detection black box, a laser light source is used to irradiate the tailings slurry set in a transparent material, and the light intensity detection device is used to detect the intensity of the scattered light of the light emitted by the laser light source by the tailings slurry; at the same time, the concentration of the tailings slurry can be obtained according to the concentration detection device, and the coupling relationship between the ash content, concentration and light intensity in the tailings slurry is obtained by using the different optical properties of coal and gangue, so as to detect the ash content. Based on this, compared with the use of radiation rays in the prior art, the use of light from a laser light source is environmentally friendly and safe.

[0024] Furthermore, compared with the transmission method and the ash detection method based on image processing in the prior art, which are greatly affected by the thickness, particle size, moisture and impurities of the material, the ash content is detected by using the intensity of the scattered light emitted by the laser light source, which is less affected by factors such as the environment and materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings illustrate exemplary embodiments of the present invention and together with the description serve to explain the principles of the present invention, and these drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification;

[0026] Figure 1 is a schematic structural diagram of an integrated ash content detection system according to an embodiment of the present invention;

[0027] Figure 2 It is a schematic diagram of a curve showing the influence of the ash content and concentration of tailings slurry on the backscattered light intensity according to an embodiment of the present invention.

[0028] Reference numerals:

[0029] 1. Pushing device; 2. Concentration detection device; 3. Main pipe; 4. Branch pipe; 5. Detection black box; 6. Light intensity detection device; 7. Laser light source; 8. Control device. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] The ash content detection of tail coal in the flotation process is a hot topic and difficulty in the field of coal preparation at home and abroad. The existing detection methods have their own shortcomings. For example, although the natural gamma ray method is safe and environmentally friendly, it is suitable for coal with a high content of radioactive elements and is easily affected by the environment; the X-ray fluorescence detection method has a short detection cycle and high safety, but it is only suitable for elements with a high atomic number; the dual-energy gamma ray transmission method is less affected by factors such as material thickness, particle size, and bulk density after improvement, but is still affected by moisture and impurities; the ash content detection method based on image processing has poor generalization ability due to the large number of image features.

[0032] In response to the above problems, the integrated ash detection system of the exemplary embodiment of the present invention utilizes the different optical properties of coal and gangue to obtain the coupling relationship between ash content, concentration and light intensity in the tailings slurry, so that the ash content in the flotation process can be detected online with high detection accuracy, environmental protection and high speed.

[0033] Figure 1Schematic diagram of the structure of an integrated ash detection system according to an embodiment of the present invention. Figure 1 As shown, the environmentally friendly integrated ash detection system of the exemplary embodiment of the present invention includes a laser light source 7, a light intensity detection device 6, a concentration detection device 2, a detection black box 5 and a container for accommodating tailings slurry; the laser light source 7, the light intensity detection device 6 and at least part of the container are located inside the detection black box 5; the concentration detection device 2 is used to detect the concentration of the tailings slurry; at least part of the container located inside the detection black box 5 is formed of a transparent material; the light of the laser light source 7 passes through the container to irradiate the tailings slurry; the light intensity detection device 6 is used to detect the intensity of scattered light of the tailings slurry.

[0034] In practical applications, in the flotation process system, the tailings slurry after flotation is placed or transferred to a container as a sample to be tested for ash content. The container containing the tailings slurry is placed inside the detection black box 5, and all or part of the container can be located inside the black box, and the part located inside the black box is made of transparent material, so that the laser light source 7 penetrates the container to irradiate the tailings slurry. Since the tailings slurry has a certain concentration, it will cause the irradiated light to scatter. The light intensity detection device 6, which is also arranged inside the detection black box 5, will obtain the light intensity of the backscattered light. Further, the concentration of the tailings slurry can be obtained by the concentration detection device 2 of the integrated ash detection system. Coal and gangue in the tailings slurry have different optical properties. The applicant found that there is a certain coupling relationship between the concentration, light intensity and ash content of the tailings slurry, so that the ash content in the tailings slurry can be determined according to the concentration and light intensity of the tailings slurry. Based on this, it is not only environmentally friendly but also the ash content data obtained is accurate and fast, and is not easily affected by the environment and the moisture and impurities in the tailings slurry.

[0035] It should be noted that the detection black box 5 can be made of a material that is completely opaque and non-reflective, so that the light from the external environment will not affect the laser light source 7 inside the detection black box 5, and will not cause multiple reflections of the light emitted by the laser light source 7 or the scattered light of the tailings slurry, thereby making the light intensity detected by the light intensity detection device 6 more accurate, and the ash content detection result of the tailings slurry obtained more accurate.

[0036] Figure 2 1 is a schematic diagram of the influence of the ash content and concentration of tailings slurry on the backscattered light intensity according to an embodiment of the present invention. Figure 2As shown, the horizontal axis is the concentration of the tailing coal slurry, the vertical axis is the light intensity of the backscattered light of the tailing coal slurry, and each curve is a curve of different ash content. It can be seen from the figure that at the same concentration, as the ash content increases, the backscattered light intensity also increases. At the same ash content, as the concentration increases, the backscattered light intensity also increases. Therefore, there is a significant coupling relationship between the concentration, light intensity and ash content of the tailing coal slurry. According to this coupling relationship, the corresponding ash value can be obtained based on the concentration and light intensity of the tailing coal slurry. This is also the working principle of the integrated ash detection system using the exemplary embodiment of the present invention, which can accurately detect the ash content of the tailing coal slurry.

[0037] In some embodiments, the laser light source 7 may be an 880nm infrared laser light source with a laser power of 10MW. The light emitted by the infrared laser light source 7 is environmentally friendly and safe and has a wide range of applications.

[0038] Compared with the natural gamma ray method for detecting ash content, the use of infrared laser light source 7 can overcome the problem that natural gamma rays are only applicable to coal with a high content of radioactive elements and are easily affected by the environment; compared with the ash content detection method of X-ray fluorescence detection, which is only suitable for elements with higher atomic numbers, the use of infrared laser light source 7 can be applicable to elements with various atomic numbers; compared with the ash content detection method of dual-energy gamma ray transmission, which is affected by moisture and impurities, the use of infrared laser light source 7 can avoid the influence of moisture and impurities.

[0039] Furthermore, the exemplary embodiment of the present invention uses an 880mm infrared laser light source 7, and only detects the backscattered light of the tailings slurry irradiated into the transparent container, without considering the transmitted light, so as to accurately detect the corresponding ash content of the tailings slurry. For the tailings slurry, since its light transmittance is poor or even non-transparent, the detection of the light intensity of the backscattered light can avoid the problem of being unable to detect the ash content due to the difficulty of the tailings slurry to transmit light.

[0040] In some embodiments, the integrated ash detection system of the exemplary embodiment of the present invention further includes a control device 8, and the laser light source 7, the light intensity detection device 6, and the concentration detection device 2 are respectively connected to the control device 8 for communication.

[0041] like Figure 2 As shown, the control device 8 may be a computer terminal or a PLC, in which a coupling relationship program or algorithm between the concentration, light intensity and ash content of the tailings slurry may be built in, so as to obtain the corresponding ash content value of the tailings slurry according to the coupling relationship program.

[0042] In actual applications, the computer controls the laser light source 7 to emit 880nm infrared light at the current moment, which irradiates the tailings slurry toward the container in the detection black box 5, and controls the light intensity detection device 6 to sample the light intensity of the backscattered light at the current moment. At the same time, the computer controls the concentration detection device 2 to sample the slurry concentration at the current moment, and then calculates through the coupling relationship program or algorithm stored in the computer, thereby obtaining the ash value of the tailings slurry at the current moment.

[0043] In some embodiments, the container is a pipe, the pipe runs through the detection black box 5, and the portion of the pipe located inside the detection black box 5 is formed of a transparent material.

[0044] In some embodiments, the ash detection system further includes a pushing device 1 , which is fluidically connected to the pipeline and is used to pass the tailings slurry through the detection black box 5 .

[0045] The container may be an independent vessel for holding the tailings slurry, and the vessel for holding the tailings slurry is completely sealed in the detection black box 5 for independent detection, but this embodiment can only perform one-time sampling of the tailings slurry and independently detect the ash content, and is not suitable for real-time ash content detection of the tailings flotation process. Based on this, the container of the exemplary embodiment of the present invention may be a pipe connected to the outside of the detection black box 5, and the tailings slurry is continuously transported to the pipe located inside the detection black box 5 through a pushing device 1, such as a water pump, a gear pump, a peristaltic pump, etc., so that sampling can be performed at intervals according to actual needs to obtain the ash content of the tailings slurry at the current moment, meeting the requirements of online ash content detection adapted to the flotation process to adjust the corresponding parameters according to the ash content to optimize the flotation effect.

[0046] Exemplarily, the pipe may be a quartz glass tube with excellent light transmittance and low light reflectivity.

[0047] In some embodiments, the shape of the cross-section of the conduit comprises a circle or a polygon.

[0048] When the cross-section of the pipe is circular and the pipe is a quartz glass pipe, the diameter of the pipe can be 20 mm to 30 mm. The diameter of the glass pipe is within the above range, and its curvature will not affect the reflection of light, so as to achieve accurate detection of the backscattered light intensity of the tailing coal slurry.

[0049] Exemplarily, when the shape of the cross-section of the pipeline is circular, there is a certain angle between the light intensity detection device 6 and the line connecting the light spot irradiated on the tailings slurry and the light emitted by the laser light source 7, for example, 30° to 60°, optionally 45°. Within this angle range, the intensity of the backscattered light irradiated on the tailings slurry is the largest, therefore, the accuracy of light intensity detection can be improved.

[0050] In one embodiment, when the cross-section of the pipeline is circular, the positions of the light intensity detection device 6 and the laser light source 7 in the axial direction of the pipeline are the same. For example, when the axial direction of the pipeline is vertical, the positions of the light intensity detection device 6 and the laser light source 7 in the vertical direction are the same, that is, the line connecting the light intensity detection device 6 and the light spot irradiated on the tailing coal slurry and the plane formed by the light emitted by the laser light source 7 are parallel to the horizontal plane. At this time, the line connecting the light intensity detection device 6 and the light spot irradiated on the tailing coal slurry and the light emitted by the laser light source 7 can also have an angle of 45°. This embodiment can minimize the influence of the curvature of the pipeline on the light, so as to accurately detect the backscattered light intensity.

[0051] Exemplarily, when the cross section of the pipeline is polygonal, such as a square, the light intensity detection device 6 and the laser light source 7 are at the same position in the axial direction of the pipeline. A line connecting the light intensity detection device 6 and the light spot irradiated on the tailings slurry and the light emitted by the laser light source 7 have a certain angle, such as a 90° angle.

[0052] In some embodiments, the concentration detection device 2 in the ash detection system of the exemplary embodiment of the present invention includes one of an ultrasonic concentration meter, a spectrophotometer, and an online refractometer.

[0053] Taking the ultrasonic concentration meter as an example, it can be set at the position of the pipeline between the pushing device 1 and the detection black box 5, that is, the concentration of the tailings slurry is detected before entering the detection black box 5; the ultrasonic concentration meter can also be set at the position of the pipeline inside the detection black box 5, that is, the concentration of the tailings slurry is measured while the light intensity is detected. It is understandable that the ultrasonic concentration meter can also be set at other positions of the pipeline, as long as it can detect the concentration of the tailings slurry entering the pipeline.

[0054] like Figure 1 As shown, in the ash detection system of the exemplary embodiment of the present invention, the pipeline includes a main pipe 3 and a branch pipe 4, and the branch pipe 4 is connected in parallel to the main pipe 3, wherein the tailings slurry in the flotation process is transported along the main pipe 3 by a pushing device 1 arranged on the main pipe 3, and at the same time, when passing through the branch pipe 4 connected in parallel thereto, a part of the tailings slurry flows through the branch pipe 4, and the tailings slurry in the branch pipe 4 is used for ash detection.

[0055] Exemplarily, the diameter of the branch pipe 4 is smaller than that of the main pipe 3 , that is, the main pipe 3 may be a steel pipe thicker than the branch pipe 4 , and the branch pipe 4 may be a thinner quartz glass pipe. The cross-section of the branch pipe 4 may be circular or polygonal.

[0056] When the cross section of the branch pipe 4 is circular, the diameter of the branch pipe 4 can be 20 mm to 30 mm, optionally 23 mm, 25 mm, 27 mm, 29 mm, so as to minimize the effect of the surface curvature of the circular quartz glass tube on the reflection of light. It should be noted that in order to reduce the blocking of light by the quartz glass tube, the thickness should be minimized on the basis of meeting the strength of bearing the pressure of the tailings slurry.

[0057] When the cross section of the branch pipe 4 is in the shape of a polygon, the cross section of the branch pipe 4 may be in the shape of a square.

[0058] In some embodiments, the control device 8 of the exemplary embodiment of the present invention is also used to construct a tailing coal ash content prediction model in a flotation machine process, so as to obtain the corresponding ash content through the backscattered light intensity and concentration of the tailing coal slurry.

[0059] Exemplarily, the concentration data and backscattered light intensity data of the tailings slurry samples at multiple times, as well as the corresponding true ash content, are collected. The true ash content is measured by filtering and drying the tailings slurry samples at each time, and then manually testing the ash content.

[0060] The backscattered light intensity, concentration and true ash content at the same moment constitute a set of data, and multiple sets of data at different moments constitute a data set, which is randomly divided into a training set and a test set in a ratio of 8:2.

[0061] A linear regression model is constructed with backscattered light intensity and concentration as input and true ash content as output, and the linear regression model is iteratively trained. Based on the trained linear regression model, when the scattered light intensity and concentration at a certain moment are obtained, the predicted ash content Ash1 value at that moment can be output.

[0062] Exemplarily, the linear regression model is ridge regression, which can prevent linear regression from overfitting in the present invention.

[0063] The nonlinear regression model is constructed with backscattered light intensity and concentration as input, and the difference between the predicted ash content Ash1 and the actual ash content Ash2 of the trained linear regression model is used as output. After multiple iterations of training, the final flotation tail coal ash content prediction model is obtained. Based on this, the output of the linear regression model is corrected by the output of the nonlinear regression model to obtain the final ash content prediction value Ash, where Ash = Ash1 + Ash2.

[0064] Exemplarily, the nonlinear regression model is a randomly configured network, which can avoid noise and errors generated during data collection in the present invention.

[0065] The construction, training and prediction of the above-mentioned model can be stored in the control device in the form of instructions or programs to perform real-time online ash detection.

[0066] An exemplary embodiment of the present invention further provides a tailing coal flotation system, comprising a flotation device and the ash detection system of the above embodiment.

[0067] Exemplarily, the flotation device is in communication connection with the control device 8, and the control device 8 is used to adjust the process parameters of the flotation device according to the ash value of the tailings slurry in the pipeline.

[0068] Exemplarily, both ends of the pipeline are fluidly connected to the tailings outlet of the flotation device. When the pipeline includes a main pipe 3 and a branch pipe 4, both ends of the main pipe 3 are fluidly connected to the tailings outlet of the flotation device.

[0069] In practical applications, the flotation device can be a flotation machine or a flotation column, and the flotation machine is used as an example for explanation. The main pipe 3 is connected to the tailings port of the flotation machine, and the tailings slurry in the tailings port is transported to the main pipe 3 through the pushing device 1. After passing through the main pipe 3 and the branch pipe 4, the tailings slurry returns to the tailings port of the flotation machine through the main pipe 3, thereby forming a circulation of the tailings slurry. This process does not affect the operation of the flotation machine, but after the ash content of the tailings frame is detected, since the ash content reflects the yield and recovery rate of the flotation product to a certain extent, it can guide the adjustment of the on-site flotation process parameters, and adjust the process parameters of the flotation machine through the control device 8, complete the closed-loop control of the flotation process, overcome the technical problem of lagging flotation product quality detection, and thus meet the needs of the intelligent transformation of the coal preparation plant.

[0070] The technical advantages of the above-mentioned tailing coal flotation system over the prior art are the same as those of the above-mentioned ash detection system, which will not be elaborated here.

[0071] It should be understood by those skilled in the art that the above embodiments are only for the purpose of clearly illustrating the present invention, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present invention.

Claims

1. An environmentally friendly integrated ash detection system, characterized in that: It includes a laser light source, a light intensity detection device, a concentration detection device, a detection black box, and a container for containing tailings slurry; The laser light source, the light intensity detection device and at least part of the container are located inside the detection black box; The concentration detection device is used to detect the concentration of the tailings slurry; At least a portion of the container located inside the detection black box is formed of a transparent material; The light from the laser light source passes through the container to irradiate the tailings slurry; The light intensity detection device is used to detect the light intensity of the scattered light of the tailing coal slurry.

2. The ash content detection system according to claim 1, characterized in that: The ash content detection system further comprises a control device, and the laser light source, the light intensity detection device and the concentration detection device are respectively connected to the control device for communication.

3. The ash content detection system according to claim 2, characterized in that: The container is a pipe, the pipe runs through the detection black box, and the portion of the pipe located inside the detection black box is formed of a transparent material.

4. The ash content detection system according to claim 3, characterized in that: The cross-sectional shape of the pipe includes a circle or a polygon.

5. The ash content detection system according to claim 3, characterized in that: The ash content detection system further comprises a pushing device, which is fluidically connected to the pipeline and is used to pass the tailing coal slurry through the detection black box.

6. The ash content detection system according to claim 5, characterized in that: The concentration detection device is arranged on the portion of the pipeline between the pushing device and the detection black box; or, The concentration detection device is arranged on the portion of the pipeline located inside the detection black box.

7. The ash content detection system according to claim 6, characterized in that: The concentration detection device includes one of an ultrasonic concentration meter, a spectrophotometer and an online refractometer.

8. A tail coal sorting system, characterized in that: It comprises a flotation device and the ash detection system according to any one of claims 3 to 7.

9. The tail coal sorting system according to claim 8, characterized in that: The flotation device is in communication connection with the control device, and the control device is used to adjust the process parameters of the flotation device according to the ash value of the tailing coal slurry in the pipeline.

10. The tail coal sorting system according to claim 8, characterized in that: Both ends of the pipeline are fluidly connected to the tailings outlet of the flotation device, so that the tailings slurry is circulated to the tailings outlet of the flotation device after ash content detection.

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